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Contents

1.0 Introduction 1-1

1.1 Five-Year Review Process Overview 1-1

1.2 Scope and Nature of the LaBounty Dump Site Five-Year Review 1-2

2.0 Site History 2-1

2.1 History of Response Actions 2-1

2.2 Diversion Wall Design and Construction 2-3

2.3 Past Evaluations of the Response Actions 2-4

• 3.0 Site Monitoring'and Maintenance 3-1

I 4.0 Response Action Impacts—Comparisons and Observations 4-1

4.1 Precipitation 4-1

1 4.2 Cedar River—Contaminant Concentrations and Loadings 4-3

4.3 Alluvial Wells—Water Levels and Contaminant Concentrations 4-6

4.4 Bedrock Wells—Water Levels and Contaminant Concentrations 4-9

| 4.5 Ground Water Collection System Discharge—Quantities and

Arsenic Concentrations 4-12

5.0 Applicable or Relevant and Appropriate Requirements 5-1

6.0 Conclusions .6-1

Appendices

Appendix A - Trip Memorandum

Appendix B - Data Plots

Appendix C - CD-ROM Five-Year Review Data

File, LaBounty Dump Site, 2000

Appendix D - Student t-Test Statistical Method and Example

LaBounty Dump Site 046903.0846-01Five-Year Review Report09/13/2000 TC-1

Contents (Continued)

Tables

Table 3-1 Ground Water and Surface Water Sampling

And Analysis Program 3-2

Table 4-1 Precipitation Data 4-2

Table 4-2 Cedar River Statistical Trends - 1992 to 1999 Data Compared to

Pre-Diversion Wall (1981 to 1985) Combined Data 4-4

Table 4-3 Cedar River Statistical Trends - 1992 to 1999 Data Compared to

1986 to 1991 Combined Data 4-5

Table 4-4 Alluvial Wells Statistical Trends - 1992 to 1999 Data Compared to

Pre-Diversion Wall (1981 to 1985) Combined Data 4-7

Table 4-5 Alluvial Wells Statistical Trends - 1992 to 1999 Data Compared to

1986 to 1991 Combined Data 4-8

Table 4-6 Bedrock Wells Statistical Trends - 1992 to 1999 Data Compared

to Pre-Diversion Wall (1981 to 1985) Combined Data 4-10

Table 4-7 Bedrock Wells Statistical Trends - 1992 to 1999 Data Compared

to 1986 to 1991 Combined Data 4-11

Table 4-8 Ground Water Collection System Statistical Trends - 1992 to 1999

Data Compared to 1986 to 1991 Combined Data 4-13

Table 5-1 Numeric Values for Federal and State ARARs 5-2

Figures

following page

Figure 2-1 LaBounty Site Map 2-2

LaBounty Dump SiteFive-Year Review Report09/13/2000

046903.0846-01

TC-2

1.0 Introduction

This report documents the 5-year review conducted by the U.S. Environmental

Protection Agency (USEPA) at the LaBounty Dump site in Charles City, Iowa, to determine

if the remedial response actions at the site are still protective of human health, welfare, and

the environment. Section 121 (c) of the Comprehensive Environmental Response,

Compensation, and Liability Act (CERCLA), as amended by the Superfund Amendments

and Reauthorization Act of 1980 (SARA), and Section 300.430 (f)(4)(ii) of the National Oil

and Hazardous Substances Pollution Contingency Plan (NCP) require that periodic (at least

once every 5 years) reviews be conducted for sites where hazardous substances, pollutants,

or contaminants remain at the site above levels that allow for unlimited use or unrestricted

exposure following the completion of all remedial actions for the site. The purpose of these

reviews is to determine the continued adequacy of the implemented remedial actions in

providing protection of human health, welfare, and the environment.

This 5-year review report has been prepared to document the 5-year review completed

for the LaBounty Dump site. This 5-year review has been prepared by Black & Veatch

Special Projects Corp. (BVSPC) under USEPA RAC Contract No. 68-W5-0004, Work

Assignment No. 042-FRFE-0707. Activities in preparing this report were performed to

fulfill subtasks under Task 6 of the USEPA project work plan for the LaBounty Dump site

5-year review dated October 25, 1999.

1.1 Five-Year Review Process OverviewThe 5-year review process is to be conducted by the lead agency, which is the USEPA

at the LaBounty Dump site. In general, 5-year reviews are to be started within 4 to 5 years

of the initiation of the site cleanup and continue at 5-year intervals thereafter.

The USEPA has established three levels of review. Level III requires the most in-

depth review and would be appropriate for sites where there is the greatest likelihood that the

remedial action implemented for the site are no longer protective. Level II is a less intensive

review, and Level I is appropriate for sites where it is least likely that the remedial actions

are no longer protective.

LaBounty Dump Site 046903.0846-01Five-Year Review Report09/13/2000 1-1

implementation of the response actions.


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1.2 Scope and Nature of the LaBounty Dump Site Five-Year •Review •USEPA guidance for conducting 5-year reviews presents three levels of review. This '

review of the LaBounty Dump site is a Level I review because it is unlikely that the response _

actions implemented at the site are no longer protective of human health, welfare, and the |

environment.

This 5-year review of the LaBounty Dump site included a site visit, conducted in I

August 1999, to observe the current condition of the response actions. The site visit was

conducted by USEPA personnel and a copy of the site visit trip report is included in •

Appendix A. *

In addition to the site visit, telephone interviews were conducted with the potentially

responsible party (PRP), state and local government official, and other personnel associated

with the selection and implementation of the response action at the site. The following

persons were interviewed: • I

• Mr. David Eggars, Fort Dodge Animal Health, Environmental Compliance.

Mr. Neil Leipzig, Conestoga-Rovers. I

Mr. Jim Erb, Mayor, City of Charles City, Iowa.

Mr. Tim Shane, Water Pollution Control Superintendent, City of Waterloo,

Iowa.

The following documents were reviewed in completing the 5-year review:

« Five-Year Review Report, LaBounty Landfill Site, Charles City, Iowa, |

prepared by the TES IX team for USEPA, August 1992.e Close-Out Report and Deletion Recommendation Package for the LaBounty I

Site, Charles City, Iowa, prepared by USEPA, December 30, 1988.

• LaBounty Dump Site, Charles City, Iowa, Superfund Site, Docket for Site •

Deletion from the National Priorities List (NPL), prepared by the USEPA, •

May 1993. _

« Historical and current ground water, surface water, precipitation, diversion |

wall, and river stage monitoring data.

• Other applicable guidance and regulations to determine if any new applicable I

or relevant and appropriate requirements (ARARs) relating to the

protectiveness of the response actions have been developed since •

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2.0 Site History

The LaBounty Dump site lies on the western bank of the Cedar River within the city

limits of Charles City, Iowa, as shown on Figure 2-1. The 12-acre site lies both within and

adjacent to the floodplain of the Cedar River. Before the 1950s, the site was operated as a

farm and as a borrow operation selling sand and fill soil excavated from the alluvial

overburden. In 1953, consideration was given to use of the site for disposal of solid wastes

from Solvay Animal Health Inc. (formerly Salsbury Laboratories Inc. and currently American

Home Products).

Solvay disposed of pharmaceutical wastes at the LaBounty Dump site from August

1953 to December 1977. During that period, it is estimated that more than 237,000 cubic

yards of pharmaceutical wastes were deposited at the site.

An evaluation of Solvay waste characteristics in 1977 indicated that as many as 15

discrete waste streams were generated. The greatest volume of wastes arose from operation

of the liquid waste treatment plant and concomitant production of byproduct sludges. The

major solid waste was gypsum sludge (CaS04) produced during the neutralization of sulfuric

acid. Arsenic wastes were primarily calcium arsenite (Ca3(AsO3)2) and calcium arsenate

(Ca3(AsO4)2) sludges produced during lime precipitation of arsenic-containing wastewaters.

These sludges were hauled by truck in bulk form and deposited at the site. Smaller volume

liquid waste materials included 1,1,2-trichloroethane (1,1,2-TCA), orthonitroaniline (ONA),

phenol, and nitrobenzene. According to the analytical results, leachate from the landfill is

contaminated with 36 chemicals, including some metals and heavy metals. Leachate from

the landfill contaminated the ground water in the alluvium and Upper Cedar Valley

Formation beneath the site, which discharges to the Cedar River. The contaminants of

concern and indicator parameters for the LaBounty Dump site have been established as

arsenic; 1,1,2-TCA; and ONA. Disposal at the LaBounty Dump site ceased in December

1977 following the discovery of ONA in shallow alluvial wells in Waterloo, Iowa.

2.1 History of Response ActionsSeveral discrete response actions have been implemented at the LaBounty Dump site

as a part of a phased plan for remedial action/closure. The first response action was taken

in 1977. The Iowa Department of Natural Resources (IDNR) (formerly Iowa Department of

Environmental Quality) requested and approved plans for construction of a dike around the

LaBounty Dump Site 046903.0846-01Five-Year Review Report09/13/2000 " 2-1

Idisposal area at the LaBounty Dump site.. The dike was constructed and maintained until ™

1 979 when it was determined that the downgradient portion was aggravating problems by _

fostering impoundment of precipitation and thus increasing infiltration. The dike was |subsequently removed during the 1 979 construction season.

In 1979, USEPA and IDNR outlined a phased remedial action program for the I

LaBounty site. Phase I of the program involved installation and sampling of a 24-well

ground water monitoring system and a. Cedar River sampling program. Phase I was •

implemented in October 1979. The monitoring well locations that monitor the alluvium

(designated by -A) and the Upper Cedar Valley Formation (designated by -R) are shown on M

Figure 1-1; all wells have the year of installation in their identification number. Well I

M0279-A was removed during diversion wall construction and replaced with well M0286-A

(in 1 986), which was installed after the diversion wall construction. Monthly water level •

measurements have been taken at these river stations and wells from October 1 979, with the

exception of times when wells were dry or frozen or when flooding prevented sampling at I

individual river locations. The water samples were collected monthly from .all wells andriver stations until 1992, when sampling efforts were reduced to quarterly sampling. The •

water samples have been analyzed for arsenic; 1 , 1 ,2-TCA; and ONA. •

Phase II of the remedial action program was undertaken in the 1980 construction

season and involved surface water diversion, capping, and rerouting of a storm sewer. |

The cap was designed as a 2-foot compacted clay cover placed over the contoured fill

area. A 6-inch clay cap was employed for the parking lot area around the buildings west of •

the site. Rip-rap erosion controls were installed at the toe of the cap. An existing storm

sewer through the site was abandoned and a new one installed around the west and south •

ends of the landfill area. '

At the time the Phase II program was initiated, an impact assessment was made —

indicating the cap should reduce arsenic loadings into the Cedar River to acceptable levels |

by reducing surface infiltration through the wastes. Three subsequent reports indicate that

this, however, was not the case. In a January 1 98 1 report, Hickok and Associates concluded I

that the available monitoring data indicated that the response actions had not been effective

in attenuating the generation and transportation of leachate from the wastes. fl

The USEPA National Enforcement Investigations Center (NEIC) published a report ™

in October 1 982 evaluating arsenic; 1 , 1 ,2-TCA; and ONA monitoring data from the 24 wells

and river stations. Based on a statistical analysis of results before and after cap placement,

USEPA concluded that while capping had been effective where wastes were located above

LaBounty Dump Site 046903.0846-01Five-Year Review Report _09/13/2000 2-2

•

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TO RIVER 8T ATOM 11

coCM

ICO

o n

r—\^ I

/' I

200' I001 0 200'

AUJ

cce>

M0279-AM0279-RM0286-A

M0479-AM0479-R

M1289-AM1289-R

MOI79-AMOI79-R

MH-B , MII79-R

MI079-AMI079-R

M0679-ASM0679-ADM0679-RSM0679-RD

M0779-ASM0779-ADM0779-R

LIMIT OF DISPOSED WASTE

CUTOFF WALL MONITORINGWELL

LOWER CEDAR VALLEYMONITORINO WELL

NESTED MONITORINOWELLS

A -ALLUVIAL WELL

AS-SHALLOW ALLUVIALWELL

AD-DEEP ALLUVIAL WELL

R - UPPER CEDAR VALLEYWELL

RS- SHALLOW UPPER CEDARVALLEY WELL

RD-DECP UPPER CEDARVALLEY WELL

CUTOFF WALL

TO RIVEW STATION 12 ANDMCDONNELL STATION

FIGURE 2-1LABOUNTY SITE MAPFIVE-YEAR REVIEW REPORT

II1IIIIIIIIIIIIIIII

the water table it had not been effective in reducing contaminant leaching where wastes were

located below the ground water table.

In January 1985, a focused feasibility study prepared for USEPA by CH2M Hill

suggested that additional remedial response alternatives should be considered to address

wastes located below the ground water table. This report concluded that the preferred

alternatives for remedial action would be control of the ground water upgradient of the waste

area through construction of an upgradient diversion wall or dewatering the submerged

wastes through diversion pumping.

In 1985, USEPA and Solvay reached an agreement on further response actions to be

undertaken at the site. Additional response actions were implemented pursuant to a

CERCLA Section 106/Resource Conservation and .Recovery Act (RCRA) Section 3013

Consent Order issued on July 3,1985. These actions included construction of an upgradient

ground water diversion wall, installation of three Lower Cedar Valley Formation monitoring

wells, and installation of three pairs of wells to monitor the effectiveness of the diversion

wall. The Consent Order also required that water levels and chemical analyses for the

contaminants of concern be taken monthly in the monitoring wells and Cedar River for no

less than 24 months after completion of the diversion wall construction.

As the result of the Upgradient Cutoff Wall Evaluation Report prepared in April

1988, a new monitoring well nest (M1289-A and Ml289-R) was installed in 1989 to monitor

background connections in the ground water upgradient of the diversion wall.

2.2 Diversion Wall Design and ConstructionBased on the study of the arsenic loading characteristics to the Cedar River, it was

concluded by USEPA in 1982 that the major portion of the contaminant loading was

resulting from leaching of contaminants from those wastes that remained saturated beneath

the ground water table.

. To reduce the level and volume of ground water flow through the wastes, a ground

water diversion wall with a ground water collection system was constructed upgradient of

the site at the location shown on Figure 1-1. The location an depth of the wall was based on

monitoring well data and boring log information included in the January 1985 Conestoga-

Rovers & Associates Limited (CRA) report titled Upgradient Cutoff Wall-Data Base. Design

Criteria. The wall is located west of the landfilled wastes, oriented NNW-SSE with a total

length of approximately 600 feet. Operating in conjunction with the previously constructed

clay cap covering the landfilled wastes, the diversion wall was designed to reduce ground

LaBounty Dump Site 046903.0846-01Five-Year Review Report09/13/2000 2o

Iwater flowing through the Upper Cedar Valley Formation and diminish the hydraulic •

gradient upgradient of the waste material. This, in turn, would reduce the hydraulic gradient _

and total volume of water passing through the wastes resulting in reduced leachate |

production.

The upgradient diversion wall and ground water collection system was constructed •

according to the steps and specific criteria described in the Remedial Work and Monitoring

Systems Construction Report prepared by CRA for Solvay dated June 27, 1986. •

Construction of the diversion wall consisted of excavation through the overburden into the ™

Upper Cedar Valley Formation to an elevation of 965 feet above mean sea level (msl) and g

backfilling with a low permeability clay to within 6 inches of the ground water collection I

system pipe at an elevation of 976 msl. A high-density polyethylene membrane was installed

from the top of the clay material to an elevation of 980 msl. A ground water collection •

system was installed west and upgradient of the diversion wall along the alignment of the

diversion wall and consisted of perforated pipe, two manholes, and a wet well equipped with I

a pumping system. The ground water collection system excavation was backfilled with

permeable material. The water from the ground water collection system is pumped to a •

Charles City storm sewer, which discharges to the Cedar River downstream of the site. •

2.3 Past Evaluations of the Response Actions |The effectiveness of the cap and the upgradient diversion wall and ground water

collection system in mitigating the migration of contaminants into the Cedar River are I

discussed in the following reports:

• The Effects of Capping on Leachate Production at the LaBounrv Site. Charles I

City. Iowa, prepared by NEIC. October 1982.

• Upgradient Cutoff Wall Evaluation Report. LaBountv Landfill Site. Charles •

City. Iowa, prepared by the REM IV team for the EPA, April 1988. I

In its report entitled The Effects of Capping on Leachate Production. NEIC concluded

that the cap is effective where wastes are above the ground water table but is not effective f

where wastes are below the ground water table. This conclusion was based on a statistical

analysis of analytical results before and after cap installation. •

Based on a statistical analysis of data collected from 1985 to 1987, the REM IV team,

in the Upgradient Cutoff Wall Evaluation Report, recommended that (1) a new background •

well nest be installed upgradient to verify background contaminant levels in the alluvium and •

Upper Cedar Valley Formation and to evaluate whether contaminants were leaving the site ^


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to the west because of the construction of the diversion wall and (2) monthly monitoring of

the three river stations and periodic monitoring of the ground water wells should continue

to further verify apparent decreasing trends in concentration and loading of arsenic and ONA

in the Cedar River.

In 1991, ground water modeling was performed using MODFLOW and MODPATH

to determine the contaminated ground water flow paths from the LaBounty Dump site. The

modeling concluded that some of the contaminated ground water from the LaBounty Dump

site flows beneath the Gedar River to the Shaw Avenue Dump site (where it can be detected

in some of the monitoring wells closest to the river) before ultimately discharging into the

Cedar. River upstream of river monitoring Station 12.

In 1992, the USEPA conducted the first 5-year review of the response actions

implemented at the LaBounty Dump Site. The 1992 5-year review included review of

historical information and statistical analyses of the ground water, surface water,

precipitation, diversion wall, and river stage monitoring data. The 1992 5-year review

included the following conclusions:

• Overall, since installation of the diversion wall and cap through 1991, ONA,

1,1,2-TCA, and arsenic concentrations showed statistically significant

decreases in the alluvial and bedrock aquifers with the exception of 1,1,2-

TCA concentrations in wells M0979-A and M0979-R which has shown a

statistically significant increase. It should be noted, however, that 1,1,2-TCA

concentrations showed a statistically significant decrease in well nest M0879,

which is located downgradient of well nest M0979 and between M0979 and

the Cedar River. In addition, the concentrations of 1,1,2-TCA were

-.consistently lower in wells M0879-A and M0879-R than in wells M0979-A

and M0979-R. Also, ONA and arsenic concentrations in well nest M0979

showed statistically significant decreases during the same period that 1,1,2-

TCA concentrations showed a statistically significant increase in these wells.

• In the Cedar River, a statistically significant decrease in arsenic loadings at

Station 12 (downstream of the LaBounty Dump site) was identified. ONA

concentrations and loadings and 1,1,2-TCA concentrations in the Cedar River

also showed statistically significant decreases since installation of the

diversion wall.

• Land uses and potential exposures had not changed significantly for the site

since installation of the response action.


I• The response actions implemented by Solvay, together with the long-term *

maintenance and monitoring provided by Solvay continued to protect the ^

public health, welfare,, and the environment from contamination at the |

LaBounty Dump site.

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ILaBounty Dump Site . 046903.0846-01Five-Year Review Report09/13/2000 2-6 . •

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3.0 Site Monitoring and Maintenance

Ground water and river monitoring was first implemented at the site in Phase I of the

remedial action program in October 1979; Ground water and surface water samples and

water level measurements from the wells and river stations were collected on a monthly basis

(conditions permitting) until 1988, when the monitoring program was revised to include only

quarterly monitoring of some wells. Water samples were analyzed for arsenic; 1,1,2-TCA;

and ONA.

The July 3, 1985, Consent Order specifies ongoing inspection, monitoring, and

maintenance activities at the LaBounty Dump site be conducted by Solvay. The inspection

and maintenance activities include inspection of the LaBounty Dump site remedial measures

and the ground water monitoring well system on a bimonthly basis.

The Consent Order also required monthly surface water and ground water monitoring

(weather permitting) and reporting for the first 24 months following the completion of the

diversion wall construction. Site monitoring and maintenance continues in accordance with

the Monitoring and Maintenance Plan. LaBountv Landfill, prepared by CRA for Solvay,

dated May 1989. Ground water and surface water samples are collected in accordance with

the schedule presented in Table 3-1. The ground water pumped from the ground water

collection system has been monitored weekly for volume and arsenic concentration. In

addition, daily local precipitation and Cedar River mean flows are monitored and collected

monthly.

Site maintenance requires the performance of inspections of the site remedial

measures, including the cap, drainage ditches, security fence, vegetative ground cover,

diversion wall wet well, and the ground water monitoring system, on a bimonthly schedule.

Completed inspection and monitoring result reports are submitted to the USEPA on

a quarterly basis by Solvay.


Table 3-1Ground Water and Surface WaterSampling and Analysis Program

Ground WaterWell/Location

M0479-AM0579-AM0979-AM0979-RM1289-RM1289-RM1385-R .M1485-RM1585-R

M0179-A**M0179-RM0286-AM0279-RM0379-AM0379-RM0479-RM0579-RM0679-ASM0697-ADM0679-RSM0679-RD

M0779-ASM0779-ADM0779-RM0879-AM0879-RM1079-AM1079-RM1179-R

IGS-RW3 ShallowIGS-RW3 DeepCW1-85CW2-85

Analysis Parameters

ArsenicOrthonitroaniline*1 , 1 ,2-TrichloroethaneWater Level

ArsenicOrthonitroaniline*1 , 1 ,2-TrichloroethaneWater Level

ArsenicOrthonitroaniline*1 ,1 ,2-TrichloroethaneWater Level

Water Level

Collection and AnalysisFrequency

Monthly

Quarterly

Quarterly

Monthly


046903.0846-01

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Table 3-1 (Continued)Ground Water and Surface WaterSampling and Analysis Program

Ground WaterWell/Location

Analysis Parameters Collection and AnalysisFrequency

CW3-85CW4-85CW5-85CW6-85

Water Level Monthly

Station 11Station 12McDonnell Station

ArsenicOrthonitroaniline*1,1,2-TrichloroethaneRiver Stage

Monthly

Ground WaterCollection SystemDischarge

ArsenicTotal Volume

Weekly

ONA detection limit for wells M0179-A, M0179-R, M0286-A, M0279-R,M0479-A, M1279-A, M1279-R, M1385-R, M1485-R, M1585-R, and the riverstations is 0.015 parts per billion (ppb). ONA detection limit for remainingwells is 5 ppb.To be sampled providing sufficient ground water is available for samplecollection.


046903.0846-01

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4.0 Response Action Impacts—Comparisons and Observations

Past evaluations of the effectiveness of the cap and upgradient diversion wall and

ground water collection system are discussed in Section 2.3. This section presents a review

of the data collected from January 1981 through December 1999 focusing on a comparison

of data collected since the 1992 five-year review to data collected before 1992. Monitoring

data, including arsenic, ONA, and 1,1,2-TCA analytical data, precipitation data, and water

level data, were tabulated and reviewed for the period January 1981 through December 1999.

These data were plotted versus time and compared to identify cause/effect relationships

between the various parameters. The plots are presented in Appendix B. A copy of the data

files is contained on the CD-ROM titled Five-Year Review Data Files, LaBounty Dump Site,

2000, contained in Appendix C of this report.

The 1992 Five-Year Review contained a statistical comparison of the combined data

collected before the completion of the diversion wall construction (1981 through 1985) to

the data collected after the diversion wall construction completion (1986 through 1991, both

combined overall and individual years) for all the parameters discussed above using the

Student ^Test.

This Five-Year Review statistically compares the following data sets using the

Student /-Test:

The pre-diversion wall data (1981 to 1985) is compared to the 1992 to 1999

data (data collected since the 1992 Five-Year Review).

• The 1986 to 1991 data evaluated in the 1992 Five-Year Review is compared

to the 1992 to 1999 data.

The Student r-Test statistical method is described in Appendix D along with an

example calculation. The results of the statistical comparisons are presented in this section.

4.1 PrecipitationPrecipitation data were plotted against time and used as reference for comparison to

variations in ground water and surface water levels and contaminant concentrations. The

total precipitation levels for the periods before and after the diversion wall construction are

listed in Table 4-1. Rainfall was below normal in 1985 before the completion of the

diversion wall construction, and again in 1987, 1988, 1989, 1995, 1996, and 1997 after


Table 4-1

Precipitation Data

Period

Pre-diversion Wall

Post-diversion Wall

Average Annual*

Year

1981

1982

1983

1984

19851986

1987

1988

1989

1990

1991199219931994

1995

19961997

19981999

Amount

(inches)

34.71

39.89

42.81

29.82

31.05

34.38

23.92

23.30

16.25

41.53

42.47

34.55

43.77

32.92

30.88

30.0128.74

39.0150.57

<A 32.09

Statistical Trends

Compared to Pre-

Diversion Wall

(1981-1985)

Combined Data

Compared to 1986 to

1991 Combined Data

* Climatological Data Annual Summary, Iowa, 1997, Volume 108, Number 13, ISSN 0145-

0468, National Oceanic and Atmospheric Administration (NOAA).

Blank = NO SIGNIFICANT DIFFERENCE.

+ = 1992 - 1999 Values Significantly Higher.

- = 1992 - 1999 Values Significantly Lower. .


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completion of the diversion wall construction. In the remaining years, the precipitation

returned to, and exceeded, the average amount. Flooding occurred at the site in 1993 and

1999. In 1999, the flood waters inundated the south and east portions of the cap. Overall,

there was no significant difference in the precipitation compared to either the combined pre-

diversion wall (1981-1985) data or the combined 1986 to 1991 data.

4.2 Cedar River—Contaminant Concentrations and LoadingsSurface water samples collected at Station 11, which is located on the Cedar River

approximately 0.4 mile upstream of the LaBounty Dump site, represent background

contaminant concentrations and loading levels in the river relative to the LaBounty Dump

site. Station 12 and the McDonnell Station are both downstream of the LaBounty Dump site.

The statistical trends in the Cedar River concentrations and loadings are presented in Tables

4-2 and 4-3.

ONA loadings at Station 11 are statistically significantly lower compared to the pre-

diversion wall (1981-1985) data and are statistically significantly higher compared to the

1986 to 1991 data. Statistically significant overall drops in the ONA concentrations in the

Cedar River at Station 11 have occurred since installation of the diversion wall. 1,1,2-TCA

concentrations have been below detection limits at Station 11 since installation of the

diversion wall. Arsenic concentrations and loadings have shown statistically significant

decreases as compared to the pre-diversion wall (1981-1985) data. Arsenic concentrations

have shown statistically significant decreases while arsenic loadings have shown no

significant changes at Station 11 compared to the 1986 to 1991 data.

At Station 12, ONA and arsenic concentrations and loadings have consistently shown

statistically significant decreases as compared to the pre-diversion wall (1981-1985) data and

the 1986 to 1991 data. The mean ONA loading in the Cedar River at Station 12 has

decreased from 2.2 pounds per day (Ib/day) before installation of the diversion wall to

0.19 Ib/day from 1992 to 1999. The mean arsenic loading before installation of the diversion

wall (1981 to 1985 data) was 58.8 Ib/day compared to a mean loading of 24.6 Ib/day from

1986 to 1992 and 17.8 Ib/day from 1992 to 1999. All the 1,1,2-TCA concentrations from

1992 to 1999 were below detection limits at Station 12.

No analytical data for ONA, 1,1,2-TCA, or arsenic are available before installation

of the diversion wall at the McDonnell Station. At the McDonnell Station, ONA and arsenic

concentrations and loadings have consistently shown statistically significant decreases as


Table 4-2Cedar River Statistical Trends -- 1992 to 1999 Data Compared to Pre-Diversion Wall (1981-1985) Combined Data

Cedar RiverLocation

Concentrations

Station 1 1

Station 12

VIcDonnell

Loadings

Station 1 1

Station 12

VIcDonnell

ONA

1992

b

e

b

e

1993

b

e

b

e

1994

e

e

1995

b

e

b

c

1996

d

e

d

e

1997

d

c

d

c

1998

b

e

b

e

1999

d

c

d

e

1992-1999

--

..

e

—

—

e

1 , 1 ,2-TCA

1992

d

d

e

d

d

e

1993

d

d

e

d

d

e

1994

d

d

e

d

d

e

1995

d

d

e

d

d

e

1996

d

d

e

d

d

c

1997

d

d

e

d

d

e

1998

d

d

c

d

d

e

1999

d

d

e

d

d

e

1992-1999

c

c

c

c

c

e

Arsenic

1992

c

1993-.

--

e

1994

b

b

e

1995

..

-

e

1996

-

e

1997

—

-

c

1998

e

1999—

e

1992-1999

--

..

..

..

.:

c

Notes: Blank = NO SIGNIFICANT DIFFERENCE EXISTS. c = All 1992-1999 Data Hclow Detection Limits.+ = 1992 - 1999 Values Significantly Higher. d = All Data for Individual Year Below Detection Limits.-- = 1992 - 1999 Values Significantly Lower. e = No 1981-1985 Dataa = No 1992 - 1999 Data. See Appendix D for variance check information,b = Insufficient Data Above Detection Limits for Individual Year.

LaBounly Dump SiteFive-Year Review Report09/13/2000 4-4

046903.0846-01

Table 4-3Cedar River Statistical Trends -- 1992 to 1999 Data Compared to 1986-1991 Combined Data

Cedar RiverLocal ion

Concentrations

Station 1 1

McDonnell

Loadings

Station 1 1

ONA

1992

b

_,

b

1993

b

b

1994

+

1995

b

b

1996

d

d

1997

d

d

1998

b

b

1999

d

d

1992-1999

+

1,1,2-TCA

1992

d

d

dH

1993

dA

d

dj

H

1994

dA

d

dH

1995

d,1

d

dd

,t

1996

b

d

bA

1997

d

d

dd

1998

d

d

d

1999

d

d

dd

H

1992-1999

b

c

b

Arsenic

1992 1993._

1994

b

b

1995_ _

1996 1997__

1998

+

1999 1992-1999__

Notes: Blank = NO SIGNIFICANT DIFFERENCE EXISTS. c = All 1992-1999 Data Below Detection Limits.+ = 1992 - 1999 Values Significantly Higher. d = All Data for Individual Year Below Detection Limits.-= 1992- 1999 Values Significantly Lower. e = No 1981-1985 Dataa = No 1992 - 1999 Data. See Appendix D for variance check information.b = Insufficient Data Above Detection Limits for Individual Year.

LaBounty Dump SiteFive-Year Review Report09/13/2000 4-5

046903.0846-01

Icompared to the pre-diversion wall (1981 -1985) data and the 1986 to 1991 data. The ONA •

concentrations at the McDonnell Station follow the same apparent trends as those at Station _

12. At the McDonnell Station, 1,1,2-TCA concentrations have been at or below 5 parts per |

billion (ppb) since installation of the diversion wall, with the exception of an apparent

anomalous peak of 11 ppb in December 1989. •

4.3 Alluvial Wells—Water Levels and Contaminant •Concentrations

There are 13 alluvial wells onsite. Four alluvial wells monitor the ground water V

upgradient of the diversion well and cap; M0179-A, M0279-A (replaced by M0286-A),

M0379-A, and M1289-A; however, wells M0179-A and M1289-A have always been dry. m

The remaining alluvial wells are down or side-gradient of the diversion wall and cap. The 9

statistical trends in the alluvial water levels and contaminant concentrations are shown in

Tables 4-4 and 4-5. |

The water levels in the alluvial wells mirror the seasonal trends of high and low

precipitation with a lag time of approximately one month. This trend has not changed since I

installation of the diversion wall. All but three of the alluvial wells exhibited statistically

higher overall water levels when compared to the 1986 to 1991 data. One alluvial well •

(M0879-A) exhibited statistically higher overall water levels when compared to the pre- •

diversion wall (1981 to 1985) data.

Statistically significant overall decreases in ONA, 1,1,2-TCA, and arsenic |

concentrations have occurred in the all of the alluvial wells (except for arsenic in M0286-A

which exhibited no significant difference) when comparing the 1992 to 1999 data to the pre- I

diversion wall data (1981-1985). However, statistically significant increases in the water

levels and contaminant concentrations have occurred in the alluvial wells from 1992 to 1999 •

compared to the 1986 to 1991 data. Statistically significant overall increases in ONA and ™

1,1,2-TCA concentrations occurred in the wells M0479-A, M0679-AS, M0779-AS, and _

M0879-A while the arsenic concentrations significantly decreased in these same wells. Well •

M0879-A showed the most consistent significant increases in ONA and 1,1,2-TCA

concentrations. Well M0779-AD showed the most consistent significant increases in arsenic •

concentrations. All these wells are down- or side-gradient of the diversion wall and waste

disposal area. I


I

I

I

Table 4-4Alluvial Wells Statistical Trends -- 1992 to 1999 Data Compared to Pre-Diversion Wall (1981 to 1985) Combined Data

Alluvial

Wells

MO 179- A

M0279-A

M0286-A*

M0379-A

M0479-A

M0579-A

M0679-AS

M0679-AD

M0779-AS

MO779-AD

M0879-A

M0979-A

Ml 079- A

M1289-A

Water Level

1992

a

a

+-

a

1993

a

a

4

4-

4-

f

•f

a

1994

a

a

4-

a

1995

a

a

-

-

a

1996

a

a

-

-

-

-

_.

a

1997

a

a

-

a

1998

a

a

a

1999

a

a

a

1992-1999

a

a

4-

a

ONA

1992

a

a

d

d

-

-

—

d

a

1993

a

a

d

d

-

-

-

-

d

a

1994

a

a

b

d

-

-

-

d

a

1995

a

a

b

d

-

-

_

_

-

d

a

1996

a

a

d

d

-

-

d

a

1997

a

a

d

d

-

-

-

a

1998

a

a

d

d

_

-

_

a

1999

a

a

d

d

-.

-

a

1992-1999

a

a

b

c

-

-

-

-

a

1.1.2-TCA

1992

a

a

d

d

_

-

-_

4-

a

1993

a

a

d

d

-

a

1994

a

a

d

d

4-

a

1995

a

a

d

d

-

-

a

1996

a

a

d

d

...

d

a

1997

a

a

d

d

d

a

1998

a

a

d

d

d

a

1999

a

a

d

d

d

a

1992-1999

a

a

c

c

-

c

a

Arsenic

1992

a

a

d

b

-

-

_

a

1993

a

a

b

b

-

a

1994

a

a

b

d

-

„

a

1995

a

a

-

a

1996

a

a

d

_

a

1997

3

a

d

b

a

1998

a

a

b

b

a

1999

a

a

d

b

a

1992

1999

a

a

-

-

_

_

a

Notes: Blank = No Significant Difference Exists. a = No 1992 - 1999 Data.i- = 1992 - 1999 Values Significantly Higher b = Insufficient Data Above Detection Limits for Individual Year or for 1992-1999.

-- = 1992 - 1999 Values Significantly Lower. c = Al! 1992 - 1999 Data Below Detection Limits.

• = Combined Data from M0279-A and M0286A d = All Data for Individual Year Below Detection Limits

Sec Appendix D for variance check information.


046903.0846-01

4-7

Table 4-5Alluvial Wells Statistical Trends -- 1992 to 1999 Data Compared to 1986 to 1991 Combined Data

Alluvial

Wells

MO 179- A

M0286-A

M0379-A

M0479-A

M0579-A

M0679-AS

M0679-AD

M0779-AS

MO779-AD

M0879-A

M0979-A

Ml 079- A

Ml 289- A

Water Level

1992

a

4

t-

+

4-

4

4-

4-

4

*

a

199.1

a

,.

\-

-t-

i-

i

-t.

+

\-

4-

4-

a

1994

a

4

4

\

t

1

i

t-

+

a

1995

a

-t-

..

+

..

4-

+

4-

a

1996

a

a

1997

a

4

a

1998

a

-v

+

4-

4-

a

1999

a

4-

4-

+

4-

4-

a

1992-

1999

a

+

4-

+

+

4-

+

+

a

ON A

1992

a

d

d

-

+

..

d

a

1993

a

d

d

+

._

d

a

1994

a

b

d

+

+

d

a

1995

a

b

d

+

4-

+

d

a

1996

a

d

d

+

+

td

a

1997

a

d

d

„

+

-

-t-

d

a

1998

a

d

d

__

+

+

-.

+

d

a

1999

a

d

d

-f

*•

t-

+

d

a

1992-1999

a

h

c

• ^

4

4

4-

4

C

a

1,1,2-TCA

1992

a

d

4

-

-

d

a

199.1

a

d

4-

4-

4-

-

d

a

1994

a

d

4-

_.

4-

..

d

a

1995

a

d

..

-

•-

d

a

1996

a

d

4-

..

d

a

1997

a

d

_.

-

4-

-

d

a

1998

a

d

4-

-

d

a

1999

a

d

+

+

+

-

d

a

1992-

1999

a

c

+

+

+

+

..

c

a

Arsenic

1992

a

b

..

-

-

-f

a

1993

a

b

b

-

a

1994

a

b

d

4

a

1995

a

-t

a

1996

a

d

i

•»

a

1997

a

d

b

-,.

+

4

-

4-

a

1998

a

b

-

+

4-

4-

a

1999

a

d

b

-

4-

-t-

-

a

1992-1999

a

..

.

~'

-

_

4-

_ •.

-

4-

a

^lotes: Blank - No Significant Difference Exists. b= Insuflicienl Data Above Detection Limits for Individual Year or for 1992-1999. •

*• = 1992 - 1999 Values Significan ly Higher. c = All 1992 - 1999 Dala Below Detection Limits.

- - 1992 • 1999 Values Significantly Lower. d = All Dala for Individual Year Below Detection Limits,

a = No 1992 - 1999 Data. See Appendix D for variance check information.


046903.0846-01

4-8

4.4 Bedrock Wells—Water Levels and ContaminantConcentrations

There are 18 bedrock wells onsite. Five of these bedrock wells monitor the ground

water upgradient of the diversion well and cap (M0179-R, M0279-R, M0379-R, M1289-R,

and M1585-R). The remaining bedrock wells are down or side-gradient of the diversion

wall. The statistical trends in the bedrock water levels and contaminant concentrations are

shown in Tables 4-6 and 4-7. ., - .

The water levels in the bedrock wells also follow seasonal trends of high and low

precipitation. All of the bedrock wells exhibited statistically higher overall water levels when

compared to te 1989 to 1991 data. One well (IGS-3 Deep) showed statistically significant

higher overall water levels when compared to the pre-diversion wall (1981-1985) data.

Statistically significant overall decreasing trends in the contaminant concentrations

have been identified in a majority of the bedrock wells. When compared to the pre-diversion

wall data, the overall 1,1,2-TCA concentrations in M0979-R exhibited no significant

difference. All the overall arsenic concentration showed statistically significant decreases

in all the bedrock wells when compared to the pre-diversion wall data.

When compared to the 1986 to 1991 data, the overall ONA concentrations in

M0179-R and M0879-R exhibited no statistically significant difference with the remaining

wells exhibiting statistically significant lower ONA concentrations. The overall arsenic

concentrations in wells M0279-R, M0879-R, M1079-R, Mil 79-R, M1289-R, M1385-R,

M1485-R, and M1585-R, showed no statistically significant difference when compared to

the 1986-1991 data. The remaining wells showed statistically significant decreases in overall

arsenic concentrations.

The 1,1,2-TCA concentration in M0879-R exhibited statistically significant increases

compared to the pre-diversion wall (1981-1985) data and the 1986 to 1992 data. This well

is approximately 200 feet downgradient of M0979-R which exhibited statistically significant

increases in 1,1,2-TCA concentrations in the 1992 Five-Year Review. This may indicate that

the localized area of high 1,1,2-TCA concentrations identified at M0979-R in the 1992 Five-

Year Review has moved downgradient to the area surrounding M0879-R. M0979-R showed

statistically significant increases in 1,1,2-TCA concentrations in 1992 and 1993 when

compared to the pre-diversion wall (1981 to 1985) data and then showed no significant

LaBoumy Dump Site ' 046903.0846-01Five-Year Review Report09/13/2000 4-9

Table 4-6Bedrock Wells Statistical Trends -- 1992 to 1999 Data as Compared to Pre-Diversion Wall (1981-1985) Combined Data

Bedrock

Wells

MOI79-R

M0279-R

M0379-R

M0479-R

M0579-R

M0679-RS

M0679-RD

M0779-R

M0879-R

M0979-R

MI079-R

MII79-R

MI289-R

MI385-R

MI485-R

MI585-R

IGS-3 Shallow

IGS-3 Deep

1992 1993

-t-

4

1-

4

+

t

,

t

4-

Walcr Level

1994

-.

-----

-

1995

4- -

1996

-

..

-

-

-

„

1997

-

+

1998

+

1999

4-

1992-

1999

-

+

ONA

1992

d

d

d

d

-

d

d

d

d

d

a

a

1993

.-

d

d

, d

d

-

d

d

d

d

d

a

a

1994

d

d

d

d

-

d

d

d

d

d

a

a

1995

d

d

d

d

-

d

d

d

d

d

a

a

1996

d

d

d

d

d

d

d

d

d

a

a

1997

-

d

d

d

d

d

d

d

d

d

a

a

1998

d

d

d

d

d

d

d

d

d

a

a

1999

d

d

d

d-

d

d

d

d

d

a

a

1992-

1999

c

c

c

c

-

..

c

c

c

c

c

a

a

1,1,2-TCA

1992

d

d

d

d

4-

d

d

d

d

d

d

a

a

1993

d

d

b

d

+

d

d

d

d

d

d

a

a

1994

d

d

b

d

d

d

d

d

d

d

a

a

1995

d

d

b

d

-t-

d

d

d

d

d

d

a

a

1996

d

d

d

d

4-

d

d

d

d

d

d

a

a

1997

d

d

..

b

d

4-

-

d

d

d

d

d

d

a

a

1998

d

d

..

b

d

4-

d

d

d

d

d

d

a

a

1999

d

d

d

d

d

+

_

d

d

d

d

d

d

a

a

1992-

1999

c

c

c

c

+

c

c

c

c

c

c

a

a

AISCMIC

1992

b

-

e

e

b

e

a

a

199.1

..

b

b

b

d

b

b

b

a

a

1994

b

b

b

b

d

e

b

a

a

1995

d

d

e

e

b

e

a

a

1996

d

b

e

d

b

a

a

1997

d

b

e

b

b

b

a

a

1998

..

d

d

b

d

d

d

d

a

a

1999

d

d

b

b

b

b

b

a

a

1992

1999

__

-

__

..

-

e

e

e

e

a

a

Moles: Blank - No Significant DilTerence Exists. b = Insufficient Data Above Detection Limits for Individual Year.

^ = 1992 - 1999 Values Significantly Higher c = All 1992 - 1999 Data Below Detection Limits

-- = 1992 - 1999 Values Significantly Lower. d = All Data for Individual Year Below Detection Limits,

a = No 1992- 1999 Data e = No 1981-1985 Data

See Appendix D for variance check information.


046903.0846-01

Table 4-7Bedrock Wells Statistical Trends -- 1992 to 1999 Data as Compared to 1986-1991 Combined Data

Bedrock

Wells

MOI79-R

M0279-R

M0379-R

M0479-R

M0579-R

M0679-RS

M0679-RD

M0779-R

M0879-R

M0979-R

MI079-R

M1I79-R

MI289-R

MI385-R

MI485-R

MI585-R

IGS-3 Shallow

IGS-3 Deep

1992

t

f

+

4

+

f

4-

.

4-

4

t-

f

4-

f

f

f

4

Water Level

1993

f

-t-

t

4-

f

4-

f

-1

4

-I

t1

i

4-

4

4

+

1994

4-

(

f

4

4

t

4

4

4

t

H

+

4

4

4

+

1995

+

-f

+

+

4

+

+

+

+

-f

•4-

4-

+

+

1996

+

1997

4-

+

4-

4

-t-

+

+

+

4-

+

1998

+

4-

4-

4-

4-

+-

4-

f

+

-t-

4

++

+4-

1999

+

+

+

+

+

+

4

-t

+

+

+

+

+

+

+

1992-1999

+

+

+

+

+•

+

+

+

+

+

+

+

+

+

+

ONA

1992

..

„

d

d

d

d

d

d

d

a

a

1993

d

d

d

d

d

d

d

a

a

1994

d

d

d

d

d

d

a

a

1995

b

d

d

d

d

d

d

a

a

1996

d

d

b

d

d

d

a

a

1997

d

d

d

d

-

d

d

a

a

1998

d

d

4-

d

d

-

d

d

a

a

1999

d

d

-t-

d

d

.-

d

d

d

a

a

1992-

1999

c

c

c

c

c

-

c

c

c

a

a

1, ,2-TCA

1992

d

d

„

d

d

d

d

d

d

d

a

a

1993

d

b

d

d

d

d

d

d

d

a

1994

d

4-

b

d

-

d

d

d

d

d

d

a

1995

d

+

b

d

-

d

d

d

d

d

d

a

1996

d

4-

d

d

-

d

d

d

d

d

d

a

1997

d

4-

b

d

-

d

d

d

d

d

d

a

1998

d

+

b

d

-

d

d

d

d

d

d

a

1999

d

d

+

d

. d

-

d

d

d

d

d

d

a

a

1992-

1999

c

c

4-

C

+

C

c

c

c

c

c

a

a

Arsenic

1992

-

_

-

-

b

a

a

1993

-

b

b

d

b

b

b

a

a

1994

-

b

b

b

d

b

a

a

1995

d

d

b

a

a

19%

4-

d

-

..

b

d

b

a

a

1997

d

b

_

.. -

b

b

b

a

a

I99R

d

d

-

+

b

d

d

d

d

a

a

1999

d

d

-

b

b

b

b

b

a

a

1992

1999

-

"

-

-

a

a

Notes: Blank = No Significant Difference Exists. b = Insufficient Data Above Detection Limits for Individual Year.

I = 1992 - 1999 Values Significantly Higher. c = All 1992 - 1999 Data Below Detection Limits.

-- = 1992 - 1999 Values Significantly Lower d = All Data for Individual Year Below Detection Limits,

a = No 1992 - 1999 Data. See Appendix D for variance check information.


046903.0846-01

LaBoumy Dump Site 046903.0846-01Five-Year Review Report09/13/2000 4-12

IIdifference in 1994, 1995, and 1996, followed by statistically significant decreases in the

1,1,2-TCA concentrations in 1997, 1998, and 1999. M0979-R exhibited an overall ^

statistically significant decrease when compared to the 1986 to 1991 data. |

4.5 Ground Water Collection System Discharge—Quantities andArsenic Concentrations •

The ground water collected and sampled from the diversion wall ground water

collection system is monitored for total volume and arsenic concentration. The statistical I

trends in the groundwater collection system flow rates and contaminant concentrations are

shown in Table 4-8. Arsenic concentrations in the discharge have ranged from 0.0205 parts •

per million (ppm) (August 1999) to 0.35 ppm (March 1992) with an anomalous high I

concentration of 0.970 ppm in August 1986 that followed a period of high precipitation.

Lower arsenic concentrations tend to correspond with higher total flows from the collection J

system. Arsenic concentrations showed no overall statistically significant change compared

to the 1986 to 1991 data. However, the arsenic concentrations for the individual years 1997, I

1998, and 1999 exhibited statistically significant decreases compared to the 1986 to 1991

data. •

Total discharge from the ground-water collection system has ranged from a high of '

934,000 gallons (August 1993) to a low of 8,000 gallons (February 1990 and 1991). Total _

discharge from the collection system since 1987 has been following the same general pattern |

as precipitation.

iiiiIii

IIIIIIIIIIIIIIIIIII

Table 4-8Ground Water Collection System - 1992 to 1999 Data Compared to

1986 to 1991 Combined Data

Flow

1992+

1993+

1994 1995 1996 1997 1998+

1999+

1992-1999+

Arsenic Concentration

1992 1993 1994 1995 1996 1997„

1998 19..

Notes: Blank = No Significant Difference Exists. See Appendix D for variance+ = 1992 - 1999 Values Significantly Higher. information.-- = 1 992 .-„ 1 999 Values Significantly Lower.

99 1992-1999.

check


046903.0846-01

4-13

5.0 Applicable or Relevant and Appropriate Requirements

Federal and state surface water and drinking water quality requirements were

reviewed in relation to the criteria presented in the 1992 five-year Review. The Cedar River

adjacent to the site is designated a Class B(WW) stream which is to be protected for wildlife,

fish, aquatic and semiaquatic life, and secondary body contact uses. Federal and state surface

water and drinking water quality ARARs include the following:

• Federal

National Primary Drinking Water Standards - 40 CFR Part 141.

Establishes maximum contaminant levels (MCLs).

Ambient Water Quality Criteria - 40 CFR Part 131. Requires

development and publishing of water quality criteria.

• State of Iowa

Chapter 61 - Establishes surface water quality criteria.

Since the preparation of the 1992 five-year review, a MCL has been promulgated for

l.,l,2-TCA. The new MCL for 1,1,2-TCA is 5 micrograms per liter Og/L). The MCL for

arsenic has not changed since the 1992 five-year review. There are no federal or state

drinking water or surface water standards available for ONA.

The State of Iowa has set ambient surface water quality criteria for arsenic in the

Cedar River at 360 ppb (acute) and 200 ppb (chronic) for protection of aquatic life. Federal

surface water quality standards for arsenic for protection of aquatic life are 360 ppb (acute)

and 190 ppb (chronic). The federal and Iowa drinking water standard for arsenic is 50 ppb.

In addition, a standard of 100 ppb for arsenic in the Cedar River was set in the July 3, 1985,

Consent Decree.

Table 5-1 presents the current federal and state of Iowa surface water and drinking

water quality criteria for the contaminants of concern at the LaBounty Dump site. The MCL

for 1,1,2-TCA has been exceeded at the site. The maximum 1,1,2-TCA concentrations

detected in the alluvial wells, bedrock wells, and Cedar River are 58,000 //g/L (Well M0979-

A January 1988), 38,000 #g/L (Well M0479-R June 1981) and 15 Mg/L (Station 12 March

1982), respectively. In general, the maximum concentrations of 1,1,2-TCA were detected

in the wells prior to installation of the diversion wall. The 1,1,2-TCA concentrations in the

Cedar River have not exceeded the MCL since prior to the 1992 Five-Year Review, before

the promulgation of the MCL.

LaBounty Dump Site 046903.0846-01Five-Year Review Report09/13/2000 ' 5-1

Table 5-1Numeric Values for Federal and State ARARs

Contaminantof Concern

Arsenic1,1,2-TCAONA

SDWAMCL

Mg/L505

—

SDWAMCLG

Mg/L~3

—

Federal Surface WaterQuality Criteria

Protection of Aquatic LifeAcuteMg/L340

——

ChronicMg/L150

—•

State of Iowa SurfaceWater Quality Criteria

Protection of Aquatic LifeAcuteAig/L360

—

ChronicMg/L200

—~

ConsentDecree

Mg/L100

—

—Notes:MCL - Safe Drinking Water Act (SDWA) MCL.MCLG - Safe Drinking Water Act Maximum Contaminant Level Goal (MCLG).Consent Decree value set for Cedar River in the July 3, 1985, decree between EPA and Solvay.


046903.0846-01

5-2

IIIIIIIIIIIIIIIIIII

6.0 Conclusions

During the August 1999 site visit, the following observations were made regarding^

the current status of the response action at the LaBounty Dump site:

• The 1999 flood waters inundated the east and south sides of the cap.

Flood waters destroyed part of the property line chain-link fence and gate on

the north side of the property. -, . .

• ;'_" No evidence of erosion from the flooding was observed on the cap.

Overall, the 1992 to 1999 data shows statistically significant decreases in

contaminant concentrations in the alluvial and bedrock wells when compared to the pre-

diversion wall (1981 to 1985) data with the exception of 1,1,2-TCA concentrations in

M0879-R which have exhibited an overall statistically significant increase. M0879-R is

located approximately 200 feet downgradient of M0979-R, in which 1,1,2-TCA

concentrations were identified as statistically significantly higher that the pre-diversion wall

data in the 1992 Five-Year Review. This may indicate that the localized area of high

1,1,2-TCA concentrations has moved downgradient into the area around M0879-R.

Overall the bedrock wells have shown a statistically significant decreases or no

significant difference in contaminant concentrations when compared to the 1986 to 1991 data

with the exception of the 1,1,2-TCA concentrations in M0879-R showed an overall

statistically significant increase. The alluvial wells show overall statistically significant

increases in ONA and 1,1,2-TCA concentrations in wells M0479-A, M0679-AD,

M0779-AS, and M0879-A. Overall ONA concentrations were also significantly higher in

M0979-A. Overall arsenic concentrations were statistically significantly higher in wells

M0779-AS and M1079-A. These increases, however, have not been seen in the Cedar River.

At Station 12, downstream of the site, ONA and arsenic concentrations and loadings

have consistently shown statistically significant decreases as compared to the pre-diversion

wall (1981-1985) data and the 1986 to 1991 data. All the 1,1,2-TCA concentrations from

1992 to 1999 were below detection limits.

Land use and potential exposures have not changed significantly for the site since

installation of the response action. - - , . . .

In summary, while contaminant concentrations in some monitoring wells have

increased compared to the 1986 to 1991 data, the concentrations of contaminants in the

Cedar River have shown statistically significant decreases, indicating that the cap and

groundwater diversion wall are continuing to prevent contamination entering the river. In

LaBounty Dump Site _ . 046903.0846-01Five-Year Review Report ,09/13/2000 - , .' ' 6-1 . . '

Iaddition, all arsenic concentrations detected in the Cedar River have been below regulatory

standards. Therefore, the response actions implemented at the site, together with the long- •

term maintenance and monitoring continue to protect the public health, welfare, and the m

environment from contamination at the LaBounty Dump site.

USEPA believes that five-year reviews will continue to be required for the site since |

hazardous substances, pollutants, or contaminants remain at the site above levels that would

allow for unlimited use or unrestricted exposure. Accordingly; additional five-year reviews, I

as required by statute, will be conducted for the LaBounty Dump site.

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LaBounty Dump Site 046903.0846-01Five-Year Review Report .09/13/2000 6-2

IIIIII

IIIIIIIII

APPENDIX AI USEPA TRIP REPORT

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IIIIIIiIIIIIIIIIIII

MEMORANDUM

DATE: August 17, 1999.

(/FROM: Victor Walkenhorst, NOWCC/SEE Program, MOKS Branch

TO: Paul Roemerman, RPM, MOKS BranchSteve Kdvac, Chief, MOKS Branch

SUBJECT: La Bounty Disposal Site, Charles City, Iowa

The site visit to the La Bounty Disposal Site was scheduledby Paul Roemerman for Victor Walkenhorst to meet with Marley M.Panter, Environmental Manger, Fort Dodge Animal Health (FDAH),Division of American Home Health Products Corporation, onTuesday, August 10, 1999 at l:00pm. This site trip was inconjunction with a previously scheduled site visit to LehighPortland Cement Company Site at Mason City, Iowa.

The primary purpose of this site visit was to review thesite and to observe and determine if there was any damage to thecap caused by the recent flooding of the Cedar River in theCharles City area.

Marley (Mike) Panter and I toured the the cap area that had beenaffected by the 1999 flood waters. Mike Panter stated that theCedar River had crested at approximately 10.5 feet above thenormal river level. This was approximately 1.5 feet above the1993 flood water level.

- During our discussion of the site Mike Panter stated thatthe land that is not part of the cap and was formerly part of theLa Bounty Site property, had been returned, by the courts, to Mr.La Bounty, the original owner of the entire site.

The following observations were made during the site walk:

1. The lower portion of the cap is a rock face from the toeof the cap for a distance of approximately 25 feet to theedge of the vegetative portion of the cap. This rock faceis on the east (Cedar River) and the south sides of the cap.According to Mike Panter this entire rock face and about 1.5feet of vegetative cap had been covered with flood water atthe height of the flood. The flood of 1999 was ~ 1.5 to 2feet higher-on the cap then the flood of 1993.

2. Mike Panter stated that clean-up crews had removed allthe flood debris from the cap and the area between the capand the west bank of the Cedar River.

3. The property line chain link fence and gate at the northside of the property had been destroyed by the force of theflood water and associated debris that clung to< the fencefabric. A fence contractor has been engaged torepair/replace the fence and gate as necessary.

II

I

4. The cap vegetation is cut to about 4" high about 3-4 Itimes a year. The rock face is treated with weed killer at ™least two times each growing season.

5. Even though there has been flooding condition and heavyrainfall with the resultant surface water run off, there was _no evidence of erosion on the cap. Mike Panter also stated Ithat none of the monitor wells had been damaged by the highgroundwater condition. •

However, the high groundwater condition created pressure onthe cut-off wall and FDAH pumped water from the upstreamside of the wall, at the rate of 250gpm during the highwater condition, to relieve the high water pressure on thecut-off wall.

I

IBased on the FDAH company policy it was requested that

photographs not be taken of the La Bounty Disposal Site. Based Ion this request and as there was no damage to the cap area, I did *not take photographs of the site. Mike Panter stated that he hadphotographs of the site during the flood and he would send a copy Iof his photographs to Paul Roemerman with the next quarterlyreport. ^

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GW4-84:©

PROPERTY LINELIUIT OF DISPOSED WASTEAS IDENTIFIED BY BORINOSAND SALSBURV PERSONNELALIGNMENT OF UPGRAOIEN1CUT OFF WAIL ANDGROUNDWATER COLLECTIONSYSTEMSTOftll SEWER (EXISTING)

LOWER CEDAR VALLEY AQUIFERHONITOniNQ WELL

CUT OFF WALL MONI TORINOWELLMONITORING WELLSGROUTED CLOSED

figure 2

SITE PLANLaBounty Disposal Site

602-24/O6/86

APPENDIX BDATA PLOTS

B-l Precip: IonB-2 Cedar K er Stations — Contaminant Loadings and ConcentrationsB-3 Alluvial Wells — Water Levels and Contaminant ConcentrationsB-4 Bedrock Wells — Water Levels and Contaminant ConcentrationsB-5 Diversion Wall Ground Water Collection System Discharge — Total Flows and Contaminant

Concentrations

B-1Precipitation

Precipitation

<DJZoc

c c c c c: c c cc c c c c c z c c c

B-2Cedar River Stations

Contaminant Loadings and Concentrations

Station 11 Concentrations -- ONA; 1,1,2-TCA, ArsenicStation 11 Loadings--ONA; 1,1,2-TCA, ArsenicStation 12 Concentrations - ONA; 1,1,2-TCA, ArsenicStation 12 Loadings -- ONA; 1,1,2-TCA, ArsenicMcDonnell Station Concentrations ~ ONA; 1,1,2-TCA, ArsenicMcDonnell Station Loadings — ONA; 1,1,2-TCA, Arsenic

6

52TQ.S 4co

Station 11 ConcentrationsOrthonitroaniline

2

1

0

oO

cCD

cCD

c03

cCD

C(0

C03

C CCU (D

CCD

icCO

I I I I I I I Ic c c c c c c cC O C D C D C D C O C D C D T O

Concentration Detected —•— Not Detected (Detection Limit Plotted)

Station 11 Concentrations1,1,2-Trichloroethane

Con

cent

ratio

n (p

pb)

o

ro 4

^ o o

o

o

iv1

04

.V r ^HV

0

TJ•3

•

1H

CNCOiCCO

—3

1

-

.

> «MM

.. ... ..

» 4MMMH

c O ' t u n c D i ^ c o o ^ O T - c N c o ^ tc o c o o o c o o o o o c o o 5 O 5 O > a ) C J )i i i i i i i i i i i ic c c c c c c c c c c cc o c o c o c o c o c o c o c o c o c o c o c o

— 3 — 3 — 3 — 3 — 3 — 3 - 5 - 3 — 3 — 5 — 3 — 3

-H- Concentration Detected -<^Not Detected (Detection Limit Plotted)

.

_... _ .

m CD i - co a)O) O) O) O) O)

1 1 1 1 1c c c c cCO CO CO CO CO

— 3 -3 — 3 ^> — 3

Station 11 ConcentrationsArsenic

Q.a.c.o

'-t->03L—•4—'c(DOCoO

12

10

8

0

UBTT00

cCO

—3

CNooIc03

COCO

c03

c03

10coIc03

CDCO

C03

00i

C03

OOOOiC03

O)OOiC03

OO>

iC03

O)

C03

CMO5iC03

CO

03—3

05i

C03

LOO)

C03

CDO)

C03

05iC03

0005

C03

05O5C03

Concentration Detected —»- Not Detected (Detection Limit Plotted)

12

8

>>CD

T3i_0Q.

T3C

OQ.

CD

°, 2

0

Station 11 LoadingsQrthonitroaniline

CM CO LO CO h- CO

I I I I I I I I I Ic c c c c c c c c c

CM CO

£Z C

in co N- oo o

£ZIc

Ic

I IC CCD CD

Concentration Detected —o— Not Detected (Detection Limit Plotted)

Station 11 Loadings1,1,2-Trichloroethane

CD

•Concentration Detected —•— Not Detected (Detection Limit Plotted)

Station 11 LoadingsArsenic

Concentration Detected —o— Not Detected (Detection Limit Plotted)]

Station 12 ConcentrationsOrthonitroaniline

0

C O C O C O C O O O C O C O C O C O O O O O O O O C D O a )I I I Ic c c cCD CO CO CO

Ic

Ic

(0 (0 03 CDC C £Z C C C CCD CO (0 CD CO CU (0

c c c c(0 (0 CD CO

Concentration Detected —•— Not Detected (Detection Limit Plotte

Station 12 Concentrations1,1,2-Trichloroethane

Conce

ntr

atio

n (

ppb)

Df

o-

^o

oo

or

vj

-t

^c

1IH1

•

<»•

\J r^

00

C

i

11

i

111

«M

•~• ^

— -

— ..

--

^•40^4 •MMMMNH»<»«•

-» 4M

—

—

^^^_P^ BP

C O C O C O C O O O C O O O O O O ) O ) O ) O ) a >

c c c c c c c c c c c c c— 3 — 3 — 3 — 3 — 3 — 3 — 3 — 3 — 3 — 3 — 3 - D — 3

-H-Concentration Detected — »- Not Detected (Detection Limit Plotted)

in CD h- oo a>O> O3 O5 O) O3i i i i iC C C C CCD CO CD CO CD

— 3 — 3 — 3 — 3 — 3

Station 12 ConcentrationsArsenic

CO\cCO

CNCO

cCO—5

COopcCO

oocCO

LOCOIcCO

CDCO

cCO

oocOJ

coCOIcCO

O)COicCO

oO)cCO

O)IcCO

—>

CMOf)

cCO

COO5

cCO

—3

00

cCO

IO CD

CCO

iCCO

O)

cCO

COO)IcCO

0>03

IcCO

Hlh Concentration^Detected j^JJqt_Detected_(petection Limit Plotted) |

12.0000

>» 10.0000

8 8.0000 —(O-a§ 6.0000o

4.0000

2.0000

0.0000

Station 12 LoadingsOrthonitroaniline

I I I I I I I I I I I I I I I I I Ic c c c c c c c c c c c c c c c c c

Concentration Detected -<^Not Detected (Detection Limit Plotted)

0

Station 12 Loadings1,1,2-Trichloroethane

CO

cCO

CMCO

CCO

COcocCO

CO

cCO

10CO

Ic01

CDCO

cCO

opcCO

cocpcCO

CDCO

cCO

OCDI

CO

IcCO

CMCDIcCO

—3

COcpcCO

CD CD

C CCO CO

—3 —3

COCOIcCO

—3

h-cocCO•—3

CO CDCD CD

CO CO

Concentration Detected —•— Not Detected (Detection Limit Plotted) [

140

Station 12 LoadingsArsenic

00Ic05

CM00iC03

COCO

c03

—D

opc.03

1000

IcOJ

CDooIc03

opc03

ooooc03

—3

CDooIc03

oCDIc03

C03

CMO)iC03

COO>C03

CDi

C03

incpc03

—3

COO)c03

—3

h-O)c03

00CD

cOJ

CDCDC03

Concentration^ Detected —o- Not Detected (Detection Limit Plotted)]

_QQ_

c

c0

oO

2

1

0

McDonnell Station ConcentrationsOrthonitroaniline

I I Ic c c c c c c c c c

Ic

I I I I I Ic c c c c c

Concentration Detected —*— Not Detected (Detection Limit Plotted)

McDonnell Station Concentrations1,1,2-Trichloroethane

1 £.

10

.ao Q%. b

co

6- -

l_-4— •

c<Doc 4O ^O

2

0,—00

1cCO

—3

.__^^_^• wm^^^ i

. .

1? B

c N c o ^ m c o r ^ - o o o o T — C N C O ^ -o o o o c o o o c o o o o o o o o a i o ^ a ^ oI l l l l l l l l l l l lc c c c c c c c c c c c cC D C D C D C D C D C D C O C D C D C O C O C D C O

— 3 — 3 — 3 — 3 — 3 — 3 ^ > — 3 — } — 3 — 3 — 3 — 3

-m-- Concentration Detected — o— Not Detected (Detection Limit Plotted)

'

• -

•

1

LO CD Is- CO O5O O) O) O5 O)i i i i iC C C C CCD CO CD CD CD

— 3 — 3 — 3 — 3 — 3

McDonnell Station ConcentrationsArsenic

ooicCO

CMcocCO

COcocCO

—3

00IcCO

—3

If)co

CO

COCO£ZCO

coCCO

—3

0000IcCO

CD00

cCO

oCDcCO

enIcCO

CMCD

cCO

COCD

cCO

CDIcCO

IOCD

cCO

—3

COCDI

CO

h-CD

cCO

ooCD

IcCO

CDCDIcCO

Concentration Detected —•—Not Detected (Detection Limit Plotted)

1.2

OJT3

2.0.8

§ 0.6oQ.

(D

McDonnell Station LoadingOrthonitroaniline

c c c c c c c c c c c c c c c c c c c

Concentration Detected Detected (Detection Limit Plotted)

McDonnell Station Loading1,1,2-Trichloroethane

25

20CO

TJi_0)Q_0)•OC3oQ.

D)C'•aCOo

15

10

0

COCCO

CMCOICCO

COCOCCO

CO

C(C

IOCOC(0

CDCOICro

ooC(0

00opC(0

OOiC(0

oo>IC(0

O5CCO

CNJO)IC(D

COO5i

(0C(D

IDO>CCO

CDa>CCO

O)I

CO—3

COO)£1CO

O)o>I

CO—5


McDonnell Station LoadingArsenic

CO

cCO

—3

CN00

CCO

COCOcCD

00IcCD

IT)OO

CCD

CDOOiCCO

h-ooIcCD

—3

oooocCD

O)00cCD

oo>IcCD

—3

CDiCCD

—3

CN05iCCD

COCD

CCO

CD

CCO

—3

IDCD

CCD

<DCD

iCCD

h-CD

CCD

00 CDCD CD

CD CO


IIIIiiiiiiiiiiiiiii

B-3Alluvial Wells

Water Levels and Contaminant Concentrations

Well M0279-A -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0286-A -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0286-A Combined with Well M0279-A -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0379-A - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0479-A - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0579-A - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0679-AD -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0679-AS - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0779-AD -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0779-AS - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0879-A -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0979-A ~ Water Level; ONA; 1,1,2-TCA, ArsenicWell M1079-A - Water Level; ONA; 1,1,2-TCA, Arsenic

(Note: Well M0179-A has always been dry; therefore, there are no data plots provided.)

Well M0286-AWater Level

Well M0286-A OrthonitroanilineConcentration

c c c c c c c c0 3 0 3 0 3 0 3 0 3 0 3 0 3 0 3

i iC C03 03

C C C C03 03 03 03

i iC C03 03

i i iC C C03 03 03

Concentration Detected -o—Not Detected (Detection Limit Plotted)

Well M0286-A 1,1,2-TrichloroethaneConcentration

12

Q.Q.

Cg

"CD 8c0>ocoO 6

- c0 0[Z (ro c-3

Vl 00 0I Ia (•3

0 T0 0z (C (•3

4

r uD 0z i0 (-3

•> ci0 0Z £0 C•3

^^^^^

D hD 0i~ iD C•3

HMM^

O

? °I I0 (•3

1 •

4MM»<

0 C0 0:: iTJ (•3

•*»»<

t3 C0 CZ £0 C•3

*»»<

3 T

& CiZ (0 (•3

»**<

CS3 CZ £a c•3

»»»<

N) 03 CZ C0 (•3

•**»<

0 ^i) CZ £T3 (•3

***<

r u|> CZ £D (•3

»»*^

•) ClD CiZ £0 C•3

»»»<

D h13 CiZ £0 ("3

••••<

OS3 CZ £0 (•3

»»»<

D G& CiZ £V3 C•3

»»*

1313i_

5•3


COIcCD

M0286-A ArsenicConcentration

CN00

CCO

CO00

CD

00

c(0

—3

opcCO—3

CD00

C(Q

OOiCCD

—3

oooocro

—3

o>opcCD

Oo>cCD

—3(D

CNO)iCCD

COO)iCCD

—3

O)iCCD

—3

inO)

cCO—3

COO)IcCD

—3

cCD

oo05cCO

(33O3

iCCD

—3


Well M0286-A Compared to Well M0279-AWater Level

ooc03

—5

CMCOi

(0—3

COooIcCD

CO

C(0

IOooc03

CDCO

c03

cocro

COopc01

CO

c01 03

O)iC03

CNO)C03

—3

COCDi

03

CDi

C03

IOCDC03

CDCDC03

h-CDiCOJ

ooCD

£103

CDCD

C03

Well M0286 A Compared to Well M0279-AOrthonitroaniline Concentration

I I I I I I I I I I I I I I I I I I Ic c c c c c c c c c c c c c c c c c c

Concentration Detected —«— Not Detected (Detection Limit Plotted]]

Well M0286-A Compared to Well M0279-A1,1,2-Trichloroethane Concentration

35

30

co"co

CD

OO

15

Jr-

V4»4>4><>4>««X>«>«>«><>«>«>4>< '

oocCO

CMCOc(T3

—3

COCO

cCO

COIcCO

LOcoc:co

CDCOcCO

cocCO

COCOcCO

O)COcCO

O

05IcCO

CDIcCO

CM05

IC'CO

COO)cCO

CDcCO

—3

10CDcCO

CDO)£ZCO

cpcCO

00CDIcCO

CDcCO


Well M0286-A Compared to Well M0279-AArsenic Concentration

ooicCD

CNCO

CCD

COCOiCCO

CO

cCD

1000£1CD

COOO

CCD

00

CCD

OO00iCCD

COCO

cCD

OCDiCCD

—3

CO

cCD

C\JO

CCO

COCT>

CCD

cncCD

10CO

cCD

CDcncCD

—5

cCD

COCO

cCD

—3

COCOIcCD



1005

1004.5

1004

1003.5CD5 1003

§ 1002.5£

1002

1001.5

1001oo co oo c» oo co co co oo CDc(O

— 3

cCO

cCO

cCO

cCO

cCU

cCO

cCO

c cC U C O

— 3 — 3

C(0

CMCDiC(0

ooen CD

10CD

C C C(0 (0 (0

— 3 — 3 - 3

COCD

C(0

—3

CD

C(0

—3

OOCD

CCO

—3

CDCDi

CCD

Well M0379-A OrthonitroanilineConcentration

v- CM COCO CO COC03

C05

C0)

*f inoo ooi ic cCD CD

COopc03

opCCO

COoo

1cCD

0)opc:CD

0O)CCD

icCD

CMO5tCCD

COO)

CCD

O)

CCD

IDop£ZCD

CDcnicCD

h- OOO) OC CCD CD

O)Gp

CCD



45

40

_ 35\o&30

o 25*-«CO

^ 20

1

CO1c

OO OO1 1c c

GO1c

OO1c

C O O O1 1c c

CO OO1c

O) O>1 1c c

-O>1c

O>1c

O> O)1 1c c

O1c

O ) O ) O>1

-•- Concentration Detected^ —•—Not Detected (Detection Limit Plotted)]

0.03

Well M0379-A ArsenicConcentration


Well M0479 A OrthonitroanilineConcentration

c

8 10005 500

c c c c c: c cCD CD CO CD CO CD CD

i i i iC C C CCD CO CO CO



50000

45000

40000

a. 35000

c 30000o'ro 25000

1 20000oo 15000O

10000

5000

0CO

c03

CMooc03

COCOcCO

—3

COI

CO

IOCO

c03

—3

CO00

c03

COic03

00CO

C03

OO

C03

C03

O)

c03

CMO)

C03

COCD

C03

O5 O)i i

C C03 03

—3 —3

CD

°?C03

O)

C03

CO0>C03

05i

C03

—3



ooc03

CM00

c03

CO00

c03

ooc03

—3

ooic03

CD00c03

00

C03

00OO

c03

~3

O3OOC03

OO)

C03

O)

£=03

CM0>

C.03

CO0)

C.03

CD

C03

IOO5iC03

CDCOC03

O)

C03

00O)

iC03

0505C03

Concentration Detected ^^ Not Detected (Detection Limit Plotted^


979

978

0

oocCO

—3

CMoocCO-3

COopcCO-3

oocCO

—3

inoocCO-3

CD00tCCO

ooiCO—3

ooCO

cCO

— 3

O5OO

iCCO

—3

oO)cCO

—3

031c

03—3

CMO)iCCO-3.

CO0)1cCO-0

"fr°?CCO

—3

10o>1c

CO—>

CD031cCO—3

10>cCO

—3

CO031cCO•-3

O303CCO

—3

Well M0579-A OithonitroanilineConcentration

T- CN CO tCO OO CO COcCO

cCO

cCO

cCO

ID CD00 COi iC CCO CO

OO O) CN CO if) CD

cCO

cCO

cCO

IcCO

cCO

IcCO

cCO

cCO

cCO

cCO

Is-- 00 O)0 ) 0 5 ( 3 )C C CCO CO CO



20000

18000

16000

§ 14000Q.

^ 12000o'ro 10000

IoO

8000

6000

4000

2000

0COc03

CM00

03

COCOIc03

COIc03

00

c03

COopc03

opc03

ooopC(0

ooc(0

oo>c(0

O)

c(0

CNICDIc(0

COO) O)

(0 (0

LOC35Ic(0

COO)c

O5

c03

00CDIc03

CDCD

c03

Concentration Detected —»—Not Detected (Detection Limit Plotted)

0.16

0.14


00Ic.

co—3

CNCOcCO

CO00c03

00 OO

cCO

cCO

CDCOcCO

—3

00

c(0

0000

cCO

O)oocCO

oO5cCO

CDcCO

CMCDcCO

CO

°?cCO

05 CDi

C CCO CO

CO0>cCO

cpcCO

ooCDcCO

—3

CDCDcCO

—3

Concentration Detected Detected (Detection Limit Plotted)

Well M0679-ADWater Level

&"CD

_ii_CD

cocco

CMCOiCCO

—3

COCO

cCO

—3

CO

c.CO

—3

inCO

cCO-3

CDCO

C(0

—3

COcCO-3

COCO

cCO

—3

CDCOicCO

oCD

cCO

IcCO

—3

CMO)

CCO

COO)iCCO

—3

O)IcCO

inO)

cCO

CDO5IcCO

O)icCO

CO03

IcCO

—3

CDCD

i

CO

Well M0679-AD OrthonitroanilineConcentration

Concentration Detected - >— Not Detected (Detection Limit Plotted)

Well M0679-AD 1,1,2-TrichloroethaneConcentration

jQQ.a.c.

40000

35000

30000

25000

20000

§ 15000co 10000

5000

0

CO

cCO

CMCO

CCO

coopcCO

aoCCO

10COcCO

CO00£ZCO

oocCO

—3

COCOcCO

CDCO

cCO

oCD

IcCO

CDIc:CO

CNCDIcCO

COCDcCO

CD CD

c cCO CO

COCD

cCO

CDIcCO

CO CDCD CD

I Ic cCO CO


Well M0679-AD ArsenicConcentration

OO

cCO

CMooc:CO

COoo

CO—3

00

cCO

10opcCO

CDopcro

COcCO

oooocCO

CDopcCO

oCD

IcCO

CDIcCO

CMCD

cCO

COCDIcCO

—3

CDIcCO

10CDiCCO

CDCD

CCO

—3

h-CD

CCO

COCD

tCCO

CDCD

CCO

Concentration Detected —o- Not Detected (Detection Limit Plotted)

Well M0679-ASWater Level

0)•4—•

03

OO1c03

—3

CM00C03

—3

COOOc03

—)

-*00

c03

—3

inCO

c:03—3

CD00C03

00iC03

—3

OOOO

c03

CD00iC03

OCJ)C03

—3

CDC03

CMCDC03

ooCD

. - iC03

CDiC'03

IOCDC03

—3

CD0)C03

h-0)£103

OOOf)c03

CDCDC03

14000

12000

Q. 10000CL

Co"ro"c<DocoO

8000

6000

4000

2000

0

Well M0679-AS OrthonitroanilineConcentration

O O O O O O O O O O O O O O O O O O a ) O 5 O ) O ) O ) O ) O 5 O ) < J ) O )c c c c c c c c c c c c c c c c c c c

Concentration Detected —<^Not Detected (Detection Limit Plotted)

Well M0679-AS 1,1,2-TrichloroethaneConcentration

50000

45000

40000

Q. 35000Q.

c 30000ojo 25000

| 20000

o 15000O

10000

5000

0CO

cCO

CMCOIcCO

—3

COcocCO

—3

cocCO

UOCO

cCO

CDCOc(0

COIcOJ

cococ:ro

coic(0

oO)

c(0

O)IcOJ

CNO)cOJ

COO)c03

IT)O)

C(0

CDO)

C(0

O>i

C03

CO0>CCO

—3

CCO


Well M0679-AS ArsenicConcentration

CO

cCO

CMCO

IcCO

COoocCO

ooIccc

inooicCO

—3

COOO

IcCO

oocCO

0000

IcCO

CDoocCO

oo>cCO

(35

cCO

CN

CO

COCDIcCO

—3

CDiCCO

—3

10CDiCCO

CDCD

CCO

CD

cCO

—3

COCDcCO

CDCD

CCO

Concentration Detected -o— Not Detected (Detection Limit Plotted)

Well M0779-ADWater Level

980

979

972CO

cCO

—3

CMOO

co—3

COooIcCO

OO CO

cCD

cCO-3

CDCOCCO

ooIcCO

—3

00CO

cCO

CDCOIcCO

cCO

IcCO

CNO>

CCO

CO

cCO

If05iCCO

too>cCO

—3

COO)cCO CO

—3

CO05CCO

CJ>

°?£ZCO

—3

Well M0779-AD OrthonitroanilineConcentration

45000_ 40000-g. 35000~ 30000| 25000| 200008 15000o 10000

50000

c c c c c c c c c c c c c c c c c c

Concentration Detected -o-Not Detected (Detection Limit Plotted)

Well M0779-AD 1,1,2-TrichloroethaneConcentration

60000

50000

[-*- Concentration Detected —»— Not Detected (Detection Limit Plotted)

Well M0779-AD ArsenicConcentration

ooicco

CMOO

cCO

COooIcco—3

ooIcco

1000Ic(0

CDCO

cTO

ooIc.co

ooopc(0—3

0500

iC(0

oO5

CCO

OF)

C(0

CNO)iC(0

COO)

cro

CDc(0

10C5)cCO

CD05

IcCO

h-CD

cCO

ooO5

IcCO

—3

O)O)

cCO—3

Concentration Detected ^^ Not Detected (Detection Limit Plotted)

Well M0779-ASWater Level

00cCO

<N00CCO

—3

CO00c(0

00cCO

if)CO

iCCO-3

CD00CCO

CO1cCO-3

COCO1cCO-3

COCO1cCO

—3

OO)c(D

O)cOJ

CMo>

1cCTJ

COCD

cCO

—3

CDCCO

10o>£Z(0

CDOf)c(0

0)1c0}

—3

COCDCCO

—3

CD

CO—3

Well M0779-AS OrthonitroanilineConcentration

16000

_ 14000

"I 12000

g' 10000

oj 8000c0)ocoO

6000

4000

2000

0

(0 (0 CO CO CO CO

T- CM COCO CO CO COI I I Ic c c cCO CO CO CO CD

Concentration Detected —©— Not Detected (Detection Limit Plotted)

Well M0779-AS 1,1,2-TriehloroethaneConcentration

50000

45000

40000

§ 35000Q.

^ 30000o'ro 25000+-•| 20000

o 15000

10000

5000

000IcCO

CNOO

C.CO

COOOiCco

cocCO

10CO

c(0

—5

CD00

c(0

oocCO

COOOcCO

O)CO

IcCO

oO)

cCO

O)IcCO

CNo>IcCO

COO)IcCO

cCO

1005

IcCO

CDcr>cCO

O)

c.CO

00O)

cCO

O)IcCO


300

Well M0779-AS ArsenicConcentration

COIcco

CNCO

CCO

COooIcCO

00

cCO

LOooc03

COooIcCO

—3

00IcCO

oococCO

CDooIcCO

oCDcCO

CDicCO

CMO)

CCO

COo>cCO

05cCO

—3

10O)cCO

CDO)

IcCO

O)IcCO

ooCD

cCO

CDCD

cCO

Concentration Detected —e— Not Detected (Detection Limit Plotted)


978

972

ooc05

CMCOC05

COCOC05

COiC05

m00c05

CO00ic05

00iC05

obooc05

O)oo

1c05

OCDiC'05

C05

CMCDiCOJ

COCDC05

CDic-

05

in co

c05

iC05

—3

0)iC05

000)

1c05

CDic05

cg

2-»-•c0)ocoO

Well M0879-A OrthonitroanilsneConcentration

c c c c c c c c i c c c c c c c c :



50000

45000

40000

§ 35000Q.

^ 30000o'ro 25000-t— >§ 20000

15000

10000

5000

000

cCO

CNooIc03

CO00IcCO

00

cCO

inopc:CO

—3

CD00

(0

opc(0

ooooi

- • CCD

o>00

c(0

oO5I

03

O)iCCO

CMO)

CCO

—3

CO0>cCO

—3

O)

cCO

cCO

CDOf)

CCO

O)

cCO

00o>tzCO

CDO5

iCCO

Concentration Detected —•— Not Detected (Detection Limit Plotted)]

210


COIc03

—3

CNCO

C05

COcoc03

00IcO3

10ooc03

CDooc03

ooic03

—3

COooc(0

0500

iCro

o05iCro

05ic03

—3

CM05iC03

—3

CO05C03

05C03

UO05C03

CD05C03

O5iC03

COO5iC03

O5O5iCO3



978

972CO

Ic.CO

CMopcCO

COCOIcCD

—3

CO

cCO

10COcCO

CDCO

1cCO

ooc:CO

COCOicCO

CDco

1cCO

oCD

CCO

CDcCO

— >

CNCDi

CCO

—3

COCDiCCO

—3

*fCDiCCO

—>

mCDic:CO

—)

CDCD

CCO

—3

t**-CDi

CCO

—3

COCD

1cCO

—3

CDCDiCCO

—5

Wei! M0979-A OrthonitroanilineConcentration

50000_ 45000•R 40000S 35000o 30000'to 25000c 200008 15000o 10000

50000

c c c c c c c c c c c c c c c c c c



60000

50000

g- 40000c

30000•

Q)

§ 20000O

10000

00Ic03

CM00

CCD

CO00

C03

—3

00Ic03

10 COop opc cCO 03

—3 —3.

r -00icOJ—3

- Concentration

00opc03

—3

O)00icro—3

o03C(D~3

Detected —•—

03i

C03

—3

CMO)

1 i03T

Not Detectec

CO ^ IT) CO Is-O3 O3 O3 O) O)

i i i i iC C C C C03 03 OJ 03 OJ

~3 —3 ~3 - 3 — 3

(Detection Limit Plotted)

00O)c03—3

CD03

iCCO

—3

400

50

M0979-A ArsenicConcentration

00IcCO

CMCOcCO

—3

COcoIcCO

—3

cocCO

—3

10CO

IcCO

CDCOIcCO

ooIcCO

00COIcCO

CDCO

IcCO

oCDIcCO

CDIcCO

C\lCD

cCO

COCDIcCO

O)

cCO

IOO5cCO

CDCDcCO

—3

CD

cCO

COCDIcCO

CDCD

cCO

—3

Concentration Detected -«— Not Detected (Detection Limit Plotted)


972COIcCO

CNooIcCO

COooIcCO

ooIcCO

—3

ooIcCO

CDoocCO

oocCO

ooooicCO

—3

CD00

IcCO

oCD

IcCO

T- CNCD CDC CCO CO

COCDCCO

CD CDi iC CCO CO

CDCDcCO

CDcCO

00CD

cCO

CDCDIcCO

14

S-12Q.& 10c•S 8"co* 60O Ac 4O0 2

0 *V

O

£_C

Well M 1079 -A OrthonitroanilineConcentration

- -

<

UHh b b^Ai HBI tadLl vJL^H Hb

- C N C O ^ L O C O I ^ - O O CO O D O O O O O O O O O O O O O1 1 1 1 1 1 1 1z c c c c c c c tT ! ( Q ( Q C Q C Q C Q C Q ( Q (• 3 - D - 3 — 3 — 3 — > — 3 — 3 "

•

>*• • •*<>»»^< »*0<

-- • •

• *»«M>**«•<>*00<

I

D O T- CNJ CO ^ LOD O> O) O5 G5 O) O)i i i i i i i- c. c c c c c0 CD CO CO CO CO (0•3 — ) —3 —) —) -5 -3

-a- Concentration Detected — o— Not Detected (Detection Limit Plotted)

>«««<• »O0< *oo<>«.«.*

CO 1 CO O5O) O5 O5 O)i i i iC C C Cro to ro co

— 3 — 3 — 3 - 3


co oo oo.co

CT>; ' c

rocro

—3cro

—3c c c c c c c c c c c c c c c cro ro co ro ro co ro co co co co co ro ro ro co

—3 —3 ~3 — 3 - 3 —3 —3 —3 — 3 — 3 — 3 - 3 — 3 —3 ^> -3

-•-Concentration Detected — •— Not Detected (Detection Limit Plotted)

0.25

0.2

EQ.Q.

Co

'•4—•CO*->CCDoCoo

0.15

0.1

0.05

0 I-

ooiCCO

WellM1079-A ArsenicConcentration

<NOO

IC03

CO00

C.CO

ooICCO

inopcCO

CDoocCO

ooIcCO

oooocCO

CDoocCO

oo>cCO

cCO

CMO5

IcCO

—3

COO)

IcCO

O)

cCO

IOO)IcCO

—3

CDCD

cCO

O)IcCO

COO5

cCO

CDCD

cCO


B-4Bedrock Wells

Water Levels and Contaminant Concentrations

Well M0179-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0279-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0379-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0479-R ~ Water Level; ONA; 1,1,2-TCA, ArsenicWell M0579-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0679-RD -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M0679-RS ~ Water Level; ONA; 1,1,2-TCA, ArsenicWell M0779-R - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0879-R - Water Level; ONA; 1,1,2-TCA, ArsenicWell M0979-R - Water Level; ONA; 1,1,2-TCA, ArsenicWell M1079-R - Water Level; ONA; 1,1,2-TCA, ArsenicWell Ml 179-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M1289-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M1385-R -- Water Level; ONA; 1,1,2-TCA, ArsenicWell M1485-R - Water Level; ONA; 1,1,2-TCA, ArsenicWell M1585-R ~ Water Level; ONA; 1,1,2-TCA, ArsenicWell IGS3 Shallow --Water Level; ONA; 1,1,2-TCA, ArsenicWell IGS3 Deep - Water Level; ONA; 1,1,2-TCA, Arsenic

WellM0179-RWater Level

990

975COIcCO

OJcoIcCO

CO00c01

c05

unoocCO

coooicCO

h-oocCO

oooocco

oooi'C

CO

oencco

CDi

CO

CMCDiCCO

COCD

1cCO

CD

CCO

inCD

1cCO

CDCD

cCO

CDiCCO

00CDiCco

CDCD

iCCO

Well M0179-R OrthonitroanllineConcentration

T- CM co ^- in co i - co • o> o T- CM co ^- m co i co o>c o c o o o o o c o c o o o o o o o o j o o o o a ^ o o o a )C C C C C C C C C C C C C C C C C C C


Well M0179-R 1,1,2-TrichloroethaneConcentration

.aQ.

o'•*— '03•4—1

IOO

ooc:03

CMcoic03

COcoIc03

CO

C03

incoc05

CDCO

Ic03

CO

c03

COCOIc03

COIc03

oO5C03

O5iC03

—3

CMO)iC03

COO)

tC03

c03

IDO)C03

CDO)iC03

iC03

COO)iC03

O)O>C03

[-•-Concentration Detected —•— Not Detected (Detection Liniit Plotted)]

0 I-

00

cco

79-R ArsenicConcentration

CM00

C(0

COooIcCD

00

cCO

mopcco

—3

CDOOiCCO

h-coicCO

0000

cCO

CDoo

1c03

OCD

CCO

~3

O)

cCO

CMCO

cCO

COO)

cCO

O)cCO

10cr>cCO

CDCD

c.CO

CD

c:CO

ooCD

CCO

—3

CDCDIcCO

Concentration Detected -o- Not Detected (Detection Limit Plotted)

Well M0279-RWater Level

975CO

cCO

—3

CMoo

1cCO

—)

COoocCO

—3

Ttoo

1cCO

—3

m00icCO

—3

CD00

cCO

—3

r^00

cCO

—3

ooooicCO

—3.

O)opcCO

—3

oO)

1cCO

—3

O)

cCO

—}•

<N0IcCO

—3

CO0)

cCO

—3

•*05

cCO

—3

mO)cCO

—3

CD0)cCO-3

r^03

1cCO

—3

000)

1'cCO

—3

0)03

1cCO

—3

Well OrthonitroanilineConcentration

I I I I I I I I I I I I I Ic c c c c c c c c c c c c c c c

-H-Concentration Detected -<>-Not Detected (Detection Limit Plotted)


ou

5s

Q. 2Q

co

"*— ' A 1-\ O

"cCDy 1 no 10

Oc lo -

n

r .

•

00IcCO

CMopcCO—3

COCO

Ic(0

1-00

(0

lO00

CDoo

r^ooc(0

ooooic(0

o>oo

oO3I

CDiC(0

CM0>CCD

COCDCCO

rO5 CD

iCCO

CD05

h-cr>

00O)

o>0>


Well M0279-R ArsenicConcentration

0.012

0.01

§; 0.008co75 0.006-4—'• CCDg 0.004oO

0.002

0

CDC C C C C C

CD CD CD—3—3—3

TO



995

990

o>.0)

0)£ 985

(0

980

975CO

1c05

—3

CMCOiCCO

—3

COCO

1cCO

—3

M-00

1cCO—3

ir>00*cCO

—>

CDoo

1cOJ

—3

r^00c.(0

—3

0000

1c(0

—3

<J>CO1c(0

—3

o T- CM co ^r mCO CO CO CO CO COI I I I I Ic c c c c cCO 03 CO CO CO CO- 3 - 3 - 3 - 3 - 3 - 3

CO h- OO COCO CO CO CO

I I I Ic c c cCO CO CO 03- 3 - 0 - 3 - 3

Well M0379-R OrthonitroanilineConcentration

c

§ 2o

1

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 ) 0 ^ 0 5 0 5 0 ) 0 ) 0 5 0 ) 0 )I I I I I I I I I I I I I I I I I I Ic c c c c c c c c c c c c c c c c c c

Concentration Detected —o-Not Detected (Detection Limit Plotted)


*••<•••« •••<•••<•••«•••<•••

OO

c05

CMCOCCO

COCOcCO

ooIcCO

10COIcCO

COoocCO

cocCO

00cocCO

O5COIcCO

—3

OO5cCO

—3

05cCO

CMOcCO

—5

CO05

cCO

O5cCO-3

inO)IcCO

CD05

IcCO

—3

O5IcCO

ooO5IcCO

0505IcCO



00Ic(0

—3

CMCOIc03

CO00

c05

ooIcOJ

LOooc:OJ

CDoocOJ

00

cOJ

oooocOJ

CDooIcOJ

—3

oCD

IcOJ

CO

c03-3

C\lCD

cOJ

—3

COCDcOJ

—3

0>IcOJ

IOCDcOJ

CDCDcOJ

CD

cOJ

—3

00CDIcOJ

CDCDIcOJ



0.CD

CD

CD

<D•«—•03

COC03

CMooc03

coooc03

ooc03

10ooc(0

CDooc(0

cocOJ

ooooIc0}

CD00

c03

oCD

£Z(0

CDIc03

—3

OJCD

C01

COCD

03—3

CDi

C03

inCD

03

CDCDiC03

CDi

C03

00CDi

C03

CDCD

C03

Well M0479-R OrthonitroatiilineConcentration

5000

_40003*Q.

f 3000'•+3

cp

§ 2000oO

1000

0

C C C C C C C C C C C C C Z C C E I

Concentration Detected ^si - Not Detected (Detection Limit Plotted)


Co

40000

35000

30000

25000

20000•4— •

15000c

o 100005000

0

ooicCO—3

CN00IcCO

COoo£1CO

oocto

IOoocCO

CD00CCO

oocCO

0000

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—3

O)ooc(0

cCO

—3

O)cCO

CNO)cCO

COo>cCO

O> O5c cCO CO

—3 —3

CDO)IcCO

O)cCO

—3

ooO5IcCO

O)O)IcCO

—3

Concentration Detected -*-Not Detected (Detection Limit Plotted)

M0479-R ArsenicConcentration

COicto

OJooic:03

CO

°?c03

ooc03—3

IDCOi

C03

CDCOiC03

00iC03

COCOc03

O)COiC03

OO)

C03

C03

CvlO)iC03

—D

COO)

c03

O)

c03

IOO)iC03

CDO)iC03

—3

CF)C03

CO O)O) O)i iC C03 03

Concentration Detected -*- Not Detected (Detection Limit Plotted)


980

979

973T- CM COOO CO OO

LO CD OO CM CO IO CDo o c o c o o o o o c o o ) O ) C 7 ) c j ) O } O ) O ) O ) O )

00 O>

cco

cCO

—3

c cco co

IcCO

cCO

IcCO

IcCO

IcCO

I

CO—3

IcCO

IcCO

IcCO

cCO

IcCO

Ic

Ic

CO COcCO

05

CO


350

300

£250o.

g 200

I 150o

3 10050

0

Ic

I I I I I Ic c c c c c c c c c c c c c c c c

c o c o c o c o c o c o c o c o c o c o c o

Concentration Detected -H«^-Not Detected (Detection Limit Plotted)


6000

ooc03

<NOOi

CO—3

COooIcCO

oocCD

If)00

cCO

—3

CDopcCO

ooicCO

—3

oo00IcCO

—3

CDooCCO

oCDI"CCO

—3

CDIcCO

CMCDCCO

~3

COCDCCO

~3

CDCCO

10CDCCO

CDCDiCCO

CDCCO

00CDiCCO

CDCD£1CO

[-•- Concentration Detected^ -*~ Not Detected (Detection Limit Plotted)


0.07

0.06

I 0.05

c 0.04.2'.«— •03

0.030)oo 0.02O

0.01

opc03

CMCOC03

COCOC03

COic05

—3

1000ICOJ

CDCOICCO

—3

coIC(0

COCOC03

—3

CDCOICOJ

—3

oO)IC03

—3

enC03

CNJen

IC03

COenIC03

—3

oC03

—3

10enI

C03

CDenc03

—3

h-cniC03

COenc03

enO)iC03

Concentration Detected ^>^ Not Detected (Detection Limit Plotted)

Well M0679-RDWater Level

Well M0679-RD OrthonitroanilineConcentration

co

3cQ)O

oo 2

C C C C £1CO OJ CO CO

C I Z C C C C C C C C C C I Z I Z


50

45

40

135Q.

^ 30o'•g 25

20

Well M0679-RD 1,1,2-TrichloroethaneConcentration

1

COIc(0

c c(0 (0

—3 — 3

cCC

c03

c(0

c(0

c c( 0 ( 0—3—3

c(0

cCO

c(0

c(0

c(0

c(0

c(0

c(0

c(0 (0


RD ArsenicConcentration

opc.CO

CMCOcCO

—3

COoocCO

—3

COIcCO

—3

inCO

cCO

—3

COCOiCCO

h-oocCO

COCO

IcCO

—3

COIcCO

ooc:CO

t- CNO) (3)c czCO CO

—3 —3

CO

CO—3

Of) O)

c cCO CO-3 -3

CDcr>cCO

O)

cCO

—3

00CD

cCO

O)CD

cCO


Well M0679-RSWater Level

973

COIcCO

CMCO

cCD

—3

CO03CCO

—3

00Ic:CO

toooc,CO

CDCOIcCO

00IcCO

0000cCO-3

00IcCO

oO)CCO

O)IcCO

CMo>cCO

CO05cCO

0>

£1CO

10O5

cCO

COO)

cCO

—3

O)cCO

00O)

cCO

O)O)IcCO

Well M0679-RS OrthonitroanilineConcentration

C C C

[-•-Concentration Detected - >— Not Detected (Detection Limit Plotted)

Well M0679-RS 1,1,2-TrichloroethaneConcentration

CO

cCO—3

CMCO

CCO

COooIcCO

COIcCD

inCO

cCO

CDoocCO

CO

cCO

coooIcCO

CDCO

cCO

oCD

cCO

CDIc.CO

CMCDIcCO

COCDIcCO

IcCO

10O)

cCO

COo>IcCO

cCO

coo>c.CO

CDCDIc:CO

[-»- Concentration Detected —•—Not Detected (Detection Limit Plotted)

CO

c03

M0679-RS ArsenicConcentration

CMCOCO3

COCO

IC03

COiC01

mCO

c03

CDCO

c03

h-00

c03

00oo£Z03

CD00Ic03

—3

oCD

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0>

cO3

CMCDi

C03

COCDiCO3

•'id-CD

c01

incpc03

CDCD

C03

CD

C03

~3

COCD

C03

CDCD

CO3

Concentration Detected ^i^ Not Detected (Detection Limit Plotted)


CD

979

978

977 --

0)

g 976

CO975

974

973

8000

7000


c c c c c c

Concentration Detected -<&- Not Detected (Detection Limit Plotted)

12000


oocCO

CMOOCCO

COooIcCO

—3

COIcCO

1Cooc:CO

CDoocCO

—3

oocCO

ooooIcCO

CDopcro

oO)cOJ

CDcro

CNCDcCO

coC5c(0

CDIcCO

10CD

cCD

COCDiCCO

CDC(0

—3

00CDCCO

CDCDCCO


-R ArsenicConcentration

00

£Z03

CM00

C03

COooc03

00

cCO

1000c03

—3

CD00iC03

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C03

COCO

C03

CDCO

C03

OCD

C03

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CD

C03

CMCO

C03

COCD

iC03

CDi

C03

10CD

C03

—3

CDCDiC03

—5

CDi

C03

00CD

C03

CDCD

C03

Concentration Detected -^- Not Detected (Detection Limit Plotted)


978

972C N I C O ^ J - l O C O N - C O a i O T - C M C O

c o c o o o o o o o c o o o - c o c o o > o > o > o >I I I I \ I I II I Ic c c cCO CO CO CO

c c c: c cCO CO CO CO CO

c c c cCO CO CO CO

cCO

05icCO

cCO

cCO

cCO

cCO

Well M0879-R OrthonitroanilirteConcentration

900

c c c c c c c c cc o c o c o c o c o c o c o c o c o

c c c c c c c c cc o c o c o c o c o c o c o c o c o



_QQ.Q-

CO

§2000cO 1500

CM CO in CD OO CO CM CO UO CD oo co00

CO—3

oo£ZCO

—3

oo oo1 1c cCO CO

~3 —3

oo oo oo ooc c c cCO CO CO CO

—3 ~3 —3—3

-B- Concentration Detected —

oo co1 1c cCO CO

—3 —)

CO1

'CCO

—3

•— Not Detected

CO CO1 1c cCO CO

J

(Detection

CO

cCO

—3

Limit

CO CO CO

c c cCO CO CO

—3 ~3 ~3

Plotted)

CO

cCO

—3

CO1

c .CO


ooic(D

CMOOc<D

COooc(D

00

cCD

inopc(0

CDoocCD

ooc03

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CD

CDcoc:CO

oO)c(0

Ic(D

CNO5£Z(D

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O)CCD

IDO)iCCD

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979

978

972CM CO <o oo CM CO

o o c o o o c o o o c o o o c o c o Q ) O 5 O ) O ) a )c

c o c o c o c o c o c o c o c o c o c oI I

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I I I I Ic c c c c c c cc o c o c o c o c o c o c o c o

IOO)cCO

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.aQ.

co

20000

18000

16000

14000

12000

2 10000

§ 80006000

4000

2000

0

Well M0979-R OrthonstroanllioeConcentration

C C Z C C C C C C I C I Z C Z C C C C C C E I C :0 3 0 3 ( 0 0 3 0 3 0 3 0 3 0 3 ( 0 ( 1 3 ( 1 3 0 3 0 3 0 3 ( 1 3 0 3 0 3 0 3 0 5

Concentration Detected -o— Not Detected (Detection Limit Plotted)


14000

T- CM00 COI Ic c03 03

COcoIc03

ooc03

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in00

c03

CDooc03

opc03

CO00

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CDopc03

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03

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CMO3

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COCDIc03

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CDO3c03

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00O3C03-3

CDCD

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100


CO

cCO

CNJCOicCD

COoocCD

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inCOicCD

CDCOiCCD

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00

cCD

0000

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C D O - r - C M C O ^ f l O C DO O C D C D C D C D C D C D C Di i i t i i i iC C C C C C C C( O C D C O C D C D C O C O C O

CCO

00CDiCCO

CDCD

CCD



984

982

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C O C O C O O O O O C O O O O O C O C D C D1c

1c

OJ OJ

1c03

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1c

1c.

1c

1c

1c

1c

1c

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CMtCOJ

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COCDiCOJ

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COCDiCOJ

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centration Detected - >— Not Detected (Detection Limit Plotted)

o< OOO4 «00< ooo-

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100

90


00

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0.035

Well Ml079-R ArsenicConcentration

— 3 — 3 — 3 — 3 — > — > — 3

Concentration Detected ^>-Not Detected (Detection Limit Plotted)

WellM1179-RWater Level

990

988

986

984 -

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976

974

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CMCOiCCO

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Concentration Detected -o- Not Detected (Detection Limit Plotted)


500

450

cocco

inCOIcto

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COcocCO

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CO

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CCO

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J-•-Concentration Detected —»—Not Detected (Detection Limit Plotted)]

0

179-R ArsenicConcentration

CO

cCO

CNCO

cco

COooicCO

CO

cCO

tooocco

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COcoIcCO

coc:CD

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1010

1005

1000

985

995

990

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c c c c c c c c c c c c cTO ro

c c c cTO TO TO TO



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cent

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n (p

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co

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R ArsenicConcentration

0.012

0.01

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co'to 0.006L_

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0)

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1005

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995

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r--•- Concentration Detected — •— Not Detected (Detection Limit Plotted)

0.012

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co75 0.006-i—<c(D

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[-•- Concentration Detected —•— Not Detected (Detection Limit Plotted)


<D.0)

1005

1000

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Concentration Detected —«— Not Detected (Detection Limit Plotted)


Q.a.co"ro 5"c0)ocoO

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cro

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995

990

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980

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970

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Detected -•- Not Detected (Detection Limit Plotted)

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o o c o o o o o c o o o o o o o c n o o i o a )C C C C C C C C C C C C C

— 3 — 3 — 3 — 3 — 3 — 1 — 3 — 3 — 3 — 3 — 3 — 3 — 3

-H- Concentration Detected ^©^Not Detected (Detection Limit Plotted)

.-_. ..

ID CD Is- CO O5O) O) O) O) O)£= C C C C(0 (0 CD (0 (0

1.007

0.

l°-Q.

03

£ o.(DO

5° -0.001

0

IGS-3 Shallow ArsenicConcentration

I I . I I I I I I I I I I I Ic c c c c c c c c c c c c c

Concentration Detected -*-Not Detected (Detection Limit Plotted)

IGS-3 DeepWater Level

995

990

CD.CD

CD

CD•4—>

CO

985

980

975

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<N00

cCO

COCO

cCO

00

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coIc:CO

CO00

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—3

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oCD

cCO

O)cCO

CMCDcCO

COCD

cCO

CDCCO

inCDcCO

—3

CDCD

cCO

CDcCO

COCD

IcCO

CDCDcCO

Well IGS-3 Deep 1,1,2-TrichloroethaneConcentration

Con

cent

ratio

n (p

pb)

D -»

• ro

GO

4^

en

a

- • - -

u

T- CM CO TJ-CO CO CO CO

1 1 1 1c c c c(0 (0 CD (0

— 3 —3 —5 —3

• 4»-

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—

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-•-Concentration Detected — •— Not Detected (Detection Limit Plotted)

00 <J>05 05i iC C(0 (0

—3 —3

Well IGS-3 Deep 1,1,2-TrichloroethaneConcentration

u

5

~

Q.

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1

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i i i 1

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i i i i i iC C C C C C 1

1 1 1 1 1 1 1

- C C C C C CCO CO CO CO CO CO C O C O CO CO CO CO CO

— 3 — 3 —) — 3 — 3 — 3 -J — 3 — 3 — 3 -3 — 3 -}

-H— Concentration Detected — o— Not Detected (Detection Limit Plotted)

00 03O3 O>

1 1

c cCO CO

—3 —3

Well IGS-3 Deep ArsenicConcentration

U.UU7

O OHR.UUD

'P* n nn^^ U.VJUOQ.

c n r\r\Apr U.UU*f

°.£jco*i n nn^C U.UUo<DocO rj nno(j U.UUZ

O nm.UU I

n .

cocro

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coooicCO

CO

cCO

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CDcocCO

coI

CO

oococCO

CO

cCO

oO5

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—3cCO

CNJOf)

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—3

COa>iCO

cco

—3

O)icCO

CDO>

CCO

—3

o>c(0

COO)

cCO

O)o>IcCO

Concentration Detected —»-Not Detected (Detection Limit Plotted)

B-5Diversion Wall Ground Water Collection System Discharge

Total Flows and Arsenic Concentrations

Diversion Wall - Total Flow • .Diversion Wall .-'Arsenic Concentrations

1.2

EQ_Q. 0.8c

'• 0.6c0

oO

0.4

0.2

0

Diversion Wall DischargeArsenic Concentration

T

o o o o c o o o c o o o o o o o c o o > o > o > o > o > a > o > - a > a > o >c c c c c c c c c c c c c c c c c c c( 0 ( U { 0 ( 0 ( U ( 0 - ( U ( O t O ( 0 ( 0 ( O C O ( 0 ( 0 ( O C U ( 0 ( 0


ooc05

CMOO

c05

COopc

00

c03-3

IT)ooIcCO

—3

COoocOJ

—3

ooIc05

—3

COCO

Ic05

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O)ooc05

—3

OO)

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CNO)

iCOJ

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COO)

cOJ

cnc05—3

toO)cOJ

CDC35COJ

O)

CO5

COCJ)COJ—3

CDO)

C05

—3



EQ.a.co

"•«—'co

-«—•

IoO

ex?I

CO

CMCO

cCO

—3

CO00IcCO

CO

cCO

If)opcCO

CD00cCO

—3

COcCO

COCO

cCO

O)oocCO

—5

oO)

cCO

—3

CDIc.CO

CMCOIcCO

COCD

cCO

CD

cCO

m05IcCO

CDCD

cCO

CDIcCO

ooCD

cCO

CDCDIcCO

Concentration Detected ^^^ Not Detected (Detection Limit Plotted)

0.35

Well M0179-R OrthooitroanilineConcentration

o o c o o o c o o o c o o o o o c o o o o o o o o o a j o )i i i i i i i i i i i i i i i i i i ic c c c c c c c c c c c c c c c c c c



990

975

oocCO

CNICOiCco

COCOcco

oo1cCO

—3

opcCO—3

CD

C

—3

oocCO—3

oococCO—3

00

cCO

—3

oCDCCO

—3

CD

CCO

CMCD

CCO

COCD

CCO

CD

CCO

10

I. c

CO

CD0)

CCO

0)

c(0

ooCDcCO

0>CD

CCO

—3

cJO

"CD

1000000

900000

800000

700000

600000

500000

400000

300000

200000

100000

0

Diversion WallFlow

G O O O G O G O O O O O O O G O G O O > O > O ) O > O > O > ' O > O ) O > O >c c c c c c c c c c c c c c c c c c i c :( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 0 ( 8 ( 0 ( 0 ( 0 ( 0

— D — 3 — 3 — 3 — 3 — 3 = ^ — 3 — 3 - ^ — 3 — 3 — 3 — 3 — S — D - } — } — 3

Unscanned Document

This document was unable to be scannedinto SDMS due to its size or construction

Appendix CCD-ROM Fjve-Year Review Data Files

LaBounty Dump Site2000

Contains:Alluvial.wk4 (alluvial wells data) ;

Bedrock.wk4 (bedrock wells data)Divers.wk4 (diversion wall data)-|

Cedar-p.wk4 (Cedar River and precipitation data) ||

IIIIIiiii

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Appendix DStudent f-Test Statistical Method an Examples

Appendix DStudent Mest Statistical Method and Examples

Statistical Student t-Test Procedure

The following procedure was used to apply the Student Mest to the LaBounty Dump siteanalytical data as part of the second Five-Year Review.

Before statistical testing began, all the data for each sampling location (alluvial well, bedrockwell, station) was checked to see if data was missing, if there were non-detect results, andif any of the data had been entered into the spreadsheets as text. Missing data was obtainedfrom the USEPA and entered into the data sets. All non-detect results were re-entered intothe tables as numerical values equal to half the applicable detection limit.

Step 1 - Review to determine if 1992 to 1999 data was available.For each sampling location (alluvial well, bedrock well, river station, etc.) the available datasets (water level, ONA, 1,1,2-TC A, or arsenic) were checked to see if samples were collectedfrom 1992 to 1999. If there was no data collected during 1992 to 1999 for a data set, thestatistical test could not be performed. An "a" code was entered into the appropriate cell inthe statistical analysis summary table to represent this case.

Step 2 - Review of non-detect results.For the data sets with data from 1992 to 1999, each year in the data set was individuallyreviewed for the following:

Step 2a - Review to check if all results for the year are non-detect.Each individual year's data was reviewed to see if all the results were non-detect. Ifall the results for the year were non-detect, the statistical test could not be performed.A "d" code was entered into the appropriate cell in the statistical analysis summarytable to represent this case.

Step 2b - Review to check if all the results from 1992 to 1999 were non-detect.If all the 1992 to 1999 results for a data set were non-detect, the statistical test couldnot be performed. A "c" code was entered into the appropriate cell in the statisticalanalysis summary table to represent this case. •

Step 2c - Review to check if there were sufficient detect results.Each individual year's data was reviewed to see if there were at least three detectedresults. If there were only one or two detected results, the statistical test could notbe performed. A "b" code was entered into the appropriate cell in the statisticalanalysis summary table to represent this case.

LaBounty Dump Site 046903-0846-0]Fvie-Year Review. -p* -iAppendix D *~^~ *

IStep 3 - Review to determine if data from earlier periods was available. ™Each data set was checked to see if at least three detect results were available from the earlierperiods (either 1981 to 1985 or 1986 to 1991). If there were not three detected results from Ithe earlier period, the statistical test could not be performed. Any cells in the statisticalanalysis summary tables that did not already have "b", "c", or "d" codes were coded "e" to _represent this case (i.e., the codes for non-detect results for the 1 992 to 1 999 data were listed Iin the cells before the "e" code for no earlier period data).

Step 4 - Performing the Student r-test. •The 1 992 to 1 999 data sets that had three or more detected results and had three or moredetected results from an earlier period were analyzed using the Student r-test. All •calculations were performed using Lotus 1-2-3, Release 5. These calculations were |performed using the results above the detection limit and all non-detect results. "No Sample"results were not used. For example, if a 1986 to 1991 data set had 46 detected and non- •detect results and 26 No Sample results, the average and standard deviation would be |calculated using 46 values, not 72, and the number of results would be 46, not 72.

Step 4a - Earlier period calculations. mThe average, standard deviation, and the number of results from the earlier periodwere calculated. As discussed above, values for the non-detect results were generated •by entering half the detection level as the value. The modified values were entered •by hand. The calculations were accomplished by using the PUREAVG,PUREVARS, and PURECOUNT functions for the appropriate ranges. •

Step 4b - Calculations for years 1 992 to 1 999.The average, standard deviation, and the number of results from the individual year's •data set were calculated using the same procedures used for the earlier periodcalculations (Step 4a). _

Step 4c - Calculation of the t statistic.The /-statistic for the individual year's data was calculated using the earlier period «and the year's average, standard deviation, and number of results. The formula used |was:

I

where:x, = mean of the earlier period results (PUREAVG result) Ix2 = mean of the year or the 1 992 to 1 999 results (PUREAVG result)(£i)2 = sample variance of the earlier period results (PUREVARS result) _

LaBoumy Dump Site 046903-0846-01Fvie-Year Review p* ^Appendix D \J-£.

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(s2)2 = sample variance of the year or the 1992 to 1999 results (PUREVARS

result)/?, = number of earlier period results (PURECOUNT result)«,= number of year or the 1992 to 1999 results (PURECOUNT result)

Step 4d - Determination of the reference t statistic.The reference t value was obtained from a table of t values (included in thisappendix). The table cross-indexes the degree of freedom (Nu) for the two data setsbeing compared to the level of significance selected. The degree of freedom iscalculated by adding the number of results from the earlier period and the number ofresults for the year and subtracting two. Using the example from step 4a, if the datafor the year had three detect and non-detect results, then Nu would be 46 (earlierdata) + 3 (1992 -1999 year data) - 2 = 47. In nearly all cases, the degree of freedomwas the value for an infinite degree of freedom ([Nu] greater than 29).

The level of significance (Alpha} was 90 percent for determining if there was asignificant difference between the earlier data and the 1992 to 1999 data. The levelof significance was 95 percent for determining if the 1992 to 1999 data was higheror lower than the earlier data.

Step 4e - Comparison of calculated / to reference t.The calculated t was compared to the reference / using an IF formula. If thecalculated / was greater than the reference t (calc. t > ref. 0 or if the calculated t wasless then the negative of the reference / (calc. / < - ref. t), then there was a significantdifference between the two data sets. In this case, the formula entered "SignificantDifference" in the spreadsheet cell.

If the calculated t value was between the reference t and the negative of the referencet (- ref. t < calc. t < ref. r), the formula entered "NO SIGNIFICANT DIFFERENCEEXISTS" in the spreadsheet cell.

Step 4f -Determination if year results are higher or lower than earlier period results.If the cell that compared the calculated t to the reference t had a "SignificantDifference" result, a second IF formula determined if the Year results were higher orlower than the earlier period results. The formula entered "1992 - 1999 ResultsSignificantly Higher" or "1992 - 1999 Results Significantly Lower" in thespreadsheet cell, as appropriate. In the statistical analysis summary tables, a "+" wasentered for those cases where the 1992 to 1999 data was higher than the earlier perioddata and a "--" was entered for those cases where the 1992 to 1999 data was lowerthan the earlier period .data.

The second formula returned a "0" if the cell that compared the calculated / to thereference t had a "NO SIGNIFICANT DIFFERENCE EXISTS" result.

LaBounty Dump Siie ' 046903-0846-01Fvie-Year Re'Appendix DFvie-Year Review T-V -^

IStep 4g - Comparison of the 1992 - 1999 combined period results to the earlier •period results.All the 1992 to 1999 results were combined into one data set and steps 4a to 4f were Irepeated to compare the combined 1992 to 1999 data and the earlier period data. .

Step 5 - Checking the variances of the two data sets. •The Student /-test is not sensitive to small differences in the variances between the data sets.(A "small difference" is a factor of four [i.e., if neither variance is more than four times as _large as the other, the difference is "small"].) Therefore, the variances in the data were •checked, and the data were re-evaluated using the following steps if the variances were foundto be large (i.e., greater than a factor of four). M

Step 5a - Variances check.The calculated variances were compared to each other using two IF formulas. In mVariance Test 1, if the earlier period (1981 - 1985 or 1986 - 1991) variance was |greater than four times the variance for the 1992 to 1999 data, the formula entered"Fail" in the spreadsheet cell. In Variance Test 2, if the 1992 to 1999 period variance •was greater than four times the variance for the earlier period data, the formula •entered "Fail" in the spreadsheet cell. The formulas entered "Pass" in the spreadsheetcells otherwise. I

Step 5b - Data transformation.If either or both of the tests' results were "Fail", the data was transformed to try to Ireduce the variances to within a factor of four. The first transform used was to take •the natural log (LN) of the original data. Steps 4a to 5a were then repeated, using thenatural log transformed data. I

If either of the variance test results for the natural log transformed data were "Fail",the data was transformed a second time. The second transformation was to take the •square root (# A 0.5) of the original data. Steps 4a to 5a were repeated again, usingthe transformed square root data. _

Step 5c - Results selection.If both variance results were "Pass" with the original data, the results from Steps 4e «and 4f were used. Otherwise, the data was transformed to natural log values and |retested.

If both variance results were "Pass" with the natural log transformed data, the results |from Steps 4e and 4f from the natural log transformed data were used. Otherwise,the data was transformed to square root values and retested. •

LaBoumy Dump Site 046903-0846-01Fvie-Year Review p* AAppendix D LJ-t

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If both variance results were "Pass" with the square root data, the results from Steps4e and 4f from the square root transformed data were used. Otherwise, the resultsfrom the tests on the original, untransformed data were used. ,

Step 5d - Transformation Summary Tables.Table 1 through 8 (included in this appendix) were used to identify if the data had tobe transformed. The following codes were used in the transformation summarytables: • , " ' • " ' ' • ' - . -

X - Original data was "a", "b", "c", "d", or "e" coded, so no statistical testscould be conducted. ••• • -Blank Cell - The variance test results for the original data were both "Pass",so no transformation was necessary. •- ,LN - The natural log transformation was successful (both variance test results

. for the transformed data were "Pass"). .Root - The square root transformation was successful (both variance testresults for the transformed data were "Pass").No- Neither transformation was successful. The statistical test results fromthe original, untransformed data were used even though the differencebetween the variances was large. • . '

Examples- -.- ^

The following are examples illuatrating the steps in the statistical analysis. The examples;use the attached'pages of analytical data for Alluvial Well No. M0379-A, comparing the1981 to 1985 period data to the 1992 to 1999 period data.

Statistical Analysis Summary Tables .Step 1. There is data available from 1992 to 1999; therefore no "a" code was entered intothe statistical analysis summary table.

Step 2a. For ONA and 1,1,2-TCA, all the analytical data for the individual years are non-detect; therefore "d" codes were entered into the appropriate cells in the statistical analysissummary tables. .For arsenic, all the results for 1994 and 1996 were non-detect, therefore a"d" code was entered into these two cells in the statistical analysis summary table.

Step 2b. For ON A and 1,1,2-TCA, all the analytical data for 1992 to 1999 were non-detect;therefore "c" codes were entered into these two cells in the statistical analysis summarytables. -. '

Step 2c. For arsenic, there were less than three detections for 1992, 1993, 1997,1998, and1999; therefore a "b" code was entered into these cells in the statistical analysis summarytable. .

LaBounty Dump Site , ' . - 046903-0846-01Fvie-Year Review p> r ' ''Appendix D ' ' LJ-J - •

IStep 3. There were at least three .detect results from the 1981 -1985 period; therefore, no "e" 'code was entered into the statistical analysis summary tables.

Step 4. The student /-test was performed for the water level data (all years) and the arsenicdata (1995 and combined 1992 through 1999). Following the calculations, a "+" was enteredinto the statistical analysis summary table indicating the 1992 water levels were significantly Ihigher than the 1981 - 1985 water levels; "--" were entered into the statistical analysissummary table indicating the 1995 and the 1992 to 1999 combined arsenic concentrations _were significantly lower than the 1981 - 1985 concentrations. Blank cells were left for the Iindividual year 1993 to 1999 water level and the combined 1992 to 1999 water level cellsin the statistical analysis summary .table indicating there was no significant difference •between these levels and the 1981 - 1985 water levels. ' |

Transformation Summary Tables mStep 5. |The ONA, 1,1,2-TCA, and most of the individual year arsenic data was coded d, c, and b.Therefore, in Table 4, these cells were coded "X". •

For the water level data, none of the data had variances with a large difference. These cells(the individual 1992 to 1999 cells and the combined 1992 to 1999 cell) were left blank in •Table 4, indicating that the original, untransformed data could be used. •

The 1995 and the combined 1992 to 1999 arsenic data were transformed to their natural log Ivalues. The transformation was successful in reducing the difference between the variances •to acceptable levels. In Table 4, these cells were coded "LN". No cells were coded "Root"or "No" for this data set. I

LaBoumy Dump She 046903-0846-01Fvie-Year Review T-\ /:Appendix D LJ-0

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Table 1Precipitation Statistical Trends - 1992 to 1999 Data Compared to Pre-Diversion Wall (1981-1985) Combined Data and.

1986 to 1991 Combined Data

Precipitation

Notes:

33 1994 I 1995

I

1981 -1985

1996 I 1997 I 1998"I I" "

1999

LN

1992-1999 1992 1993 1994 1995

1986-1

1996

992

1997 1998 1999

LN

1992-191992

Blank = No Transformation Required.

LN = Natural Log Transformation Required.

Root = Square Root Transformation Required.

No = Neither Transformation Successful.

X = Insufficient data to perform statistical analysis.

Table 2

Cedar River Statistical Trends -- 1992 to 1999 Data Compared lo Pre-Diversion Wall {1981 - 1985) Combined Data

Cedar River

Locations

Concentrations

Station 1 1

Station 12

McDonnell

Loadings

Station 11

Station 12

McDonnell

ONA

1992

X

LN

X

1993

X

LN

199-1

LN

LN

X 1 X

1995

X

LN

X

1996

X

LN

X

1997

X

LN

X

1998

X

LN

X

1999

X

LN

1992-1999

LN

LN

X

X

LN

X

X

LN

X

LN

X

X

LN

X

X

X

X

LN

X

X

LN

X

X

LN

X

LN

LN

X

1.1.2-TCA

1992

X

X

X

1993

X

X

X

1994

X

X

X

1995

X

X

X

1996

X

X

X

1997

X

X

X

1998 I 1999 1992-1999

X

X

X

X 1 X

x i x

X I X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

x ! x.

x | x

x j x

Arsen c '

1992

LN

1993

LN

LN

1994

X

LN

1995

LN

LN

LN

1996

LN

LN

1997

LN

LN

1998

LN

::-:

1999

No

No

1992-1999

LN j

LN |

LN

X

LN

LN

X

X

LN

X

LN

LN

X

No

LN

X

LN

LN

X

LN

X

LN

X

LN

LN

X

Blank = No Transformation Required

LN = Natural Log Transformation Required

Root = Square Root Transformation Requited.

No = Neither Transformation Successful


Table 3Cedar River Statistical Trends -- 1992 to 1999 Data Compared to 1986 to 1991 Combined Data

• Cedar River

Locations

Concentrations

Station 1 1

Station 12

McDonnell

Loadings

Station 1 1

Station 12

McDonnell

ONA

1992

X

LN

LN

1993

X

LN

LN

1994

LN

LN

1995

X

LN

LN

1998

X

LN

LN

1997

X

LN

LN

1998

X

LN

LN

1999

X

No

1992-1999

LN

LN

X

LN

X

LN

LN

LN

LN

LN

X

LN

LN

X

LN

UN

X

LN

LN

X

LN

X LN

LN

LN

Notes: Blank = No Transformation Required.

LN = Natural Log Transformation Required.

Root = Square Root Transformation Required.



1997

X

LN

LN

X

LN

LN

1998

X

LN

LN

X

LN

1999

X

No

1992-1999

LN

LN

X LN

LN

LN

1.1.2-TCA

1992

X

X

X

1993

X

X

X

1994

X

X

X

1995

X

X

X

1996

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

1997

X

X

X

X

X

X

1998

X

X

X

X

X

X

1999

X

X

X

X

X

X

1992-1999

X

X

X

X

X

X

1992

LN

1993

LN

LN

1994

X

LN

1995

LN

LN

LN

Arsen

1998

LN

Root

LN

LN

LN

LN

'

c

1997

LN

Root

LN

LN

1998

LN

LN

No

No

LN

LN

Table 4Alluvial Wells Statistical Trends -- 1992 10 1999 Data Compared to Pre-Diversion Wall (1981.1985) Combined Data

Aluvial

Weh

M0279.A

M0286-A'

M0479.A

M0579-A

M0679AS

M0679.AD

MQ779.AS

M0779-AD

M0879-A

M0979-A

M12B9-A

1992

No

X

1993

X

1994

No

No

No

No

No

No

No

X

1995

No

X

Water U

1996

LN

X

1997 1 1998

No

No

No

No

No

X X

1999 1992-1999

j

i;

i .

X

No

x

Notes Blank = No Transformation Required


Root = Square Rool Transformation Requited

No = Nether Transformation Successful

X - insufTictenl data to perform statistical anarysn

• Data combined with Wei M0279-A

1992

NO

No

No

LN

No

No

LN

NO

1993

LN

L N .No

LN

No

No

LN

No

X

1994

No

No

No

LN

No

LN

LN

No

X

1995

No

No

No

LN

LN

No

LN

No

X

ONA

1996

No

No

No

Rool

No

LN

No

No

X

1997

No

No

No

LN

LN

No

No

No

X

1998

No

No

No

LN

No

No

No

No

X

1999

No

No

LN

No

LN

LN

No

No

X

1992-1999

LN

No

LN

LN

Root

LN

Rool

No

X

1992

No

No

LN

LN

LN

X

1993 1994

X 1 XX | X

LN

No

LN

X

LN

No

LN

X

1 1.2'ICA

1995 1 1996 1997

x i -

No

No

LN

LN

LN

X

x

No

No

LN

LN

LN

X

*

x

NO

NO

LN

LN

X

1998 1999

1

No

No

LN

No

No

LN

X

No

LN

LN

X

1992-1999

LN

No

X

1992 1993

No

LN

LN

No

No

No

LN

X

No

LN

No

No

No

No

LN

No

X

1994

No

LN

No

No

LN

No

X

1995

No

LN

No

LN

LN

No

No

X

Afsen

1996

No

LN

No

LN

No

No

No

No

X

1C

1997

No

No

No

LN

No

No

No

No

X

1998

No

LN

No

No

No

No

No

X

1999

No

No

LN

No

No

No

No

X

1992-1999

No

LN

No

UN

LN

LN 1

No

X

Table 5Alluvial Wells Statistical Trends - 1992 to 1999 Data Compared lo 1936 to 1991 Combined Data

ABuwial

Wets

M0179-A

M0279-A

M0286-A

M0379-A

M0479-A1

M0579-A

M0679-AS

M0679-AD

M0779-AS

M0779-AD

M0879-A

M0979-A

M1079A

M1289-A

1992

X

X

NOT '

X

Notes Blank

LN

Root

No

X

1993

X

X

•7-

X

1994

X

X

No

No "

No

No

No

No

No

No

No

X

1995

X

X

No

No

No

X

Water L

1996

X

X

No

No

No

X

evH

1997

X

X

No

No

No

No

No

No

X

1998

X

X

X

1999

X

X

X

1992-1999

X

X

'No ''

No

X

1992

X

X

X

X

No

LN

No

LN

No

No

X

X

1993

X

X

X

X

No

LN

No

X

X

' ONA

1994

X

X

X

X

LN

No *

LN

LN

X

X

1995

X

X

x • 'X

LN

LN

LN

No 1

X

X

1996

' X

X

X

X

1'I,LN

Root

Root

X

X

1997

X

X

X

X

LN

Root

LN

X

X

1998

X

X

X

X

.li

LN

LN

LN

No

X

X

1999

X

X ,

X

X

No

LN

LN

LN

Root

LN

X

X

1992-1999

X

X

.1- ' X

X

, No

LN i

LN

LN

No

LN

LN

X

X

1992

X

X

J x

X

No

No

LN

LN

X

X

1993

X

X

. X

X

LN

No

No

LN

X

X

1994

X

X

X

X

LN

No

X

X

1995

X

X1 x

X

No

No

No

No

No

LN

X

X

1.1.2-T

1996

X

X

X

X

LN

No '

LN

No

No

LN

X

X

CA

1997

X

X

X

X

No

No

No

No

No

X

X

1998

X

X

x '

, N O | :

No

No

No

No

X

X

1999

X

X

X

X

No

No

;-

No

No

No

X

X

1992-1999

X "

X

X

X

LN

No

No

X

X

1992

X

X

X

X

No

LN

No

No

X

1993

X

X

X

No

LN

No

LN

No

LN

No

. No

X

1994

X

.' X

X

No

LN

No

No

No

No

X

1995

X

X

No

LN

LN

LN

No

No

X

Arsen

1996

X

X

No

LN

No

No

No

No

X

1C

1997

X

X

X

No

No

LN

No

No

LN

X

1996

X

X

X

No

LN

LN

No

No

No

X

1999

X

X

X

No

UN

IN

No

No

X

1992-1999

X

X

LN ,

LN.'1

LN

LN

No

X

= No Transformation Required

= Natural Log Transfer mat on Required

= Square Root Transformation Required

= Neither Transformation Successful

= Insuffiderrl data to perform rtatebcal anafytis

Table 6

Bedrock Wells Slatislical Trends -- 1992 to 1999 Dala Compared (o Pre-Diversion Wall (1981-1985) Combined Data

Bedrock

Wets

M0179-R

MQ279-R

M0379.R

MW79-R

M0579-R

M0679-RS

MD679-RD

M0779R

M0879-R

M0979-R

M1079-R

M1179R

Mtjag.R

M1385R

M14B5-R

M158SR

IGS-3 Shallow

IGS 3 Deep

Watei Level

199?

No

No

X

X

X

x

No

.......

1993

X

X

X

X

No

1994

No

No

No

No

No

No

No

X

X

X

X

No

No

1995

X

X

X

X

No

1996

No

No

X

X

X

X

No

1997

No

No

No

No

No

No

X

X

X

x

No

1998 1999

X

X

X

X

No

X

X

X

X

No

_ . . _

199?-1999

X

X

X

x

No

Notes Blank = No Transformation Required


Root = Square Root Transformation Reputed

No = Neither Transformation SuccessfJ

X = Insufficient data to perform statistical anar/sis

992

X

No

LM

LN

X

No

X

X

X

X

X

X

1993

X

No

No

X

*

x

X

X

x

X

1994

X

LN

LN

X

No

X

X

X

X.

X

X

1995

X

No

No

X

No

X

X

X

X

X

X

ONA

1996

X

No

-

No

X

No

X

X

X

X

X

X

1997

X

No

-

LN

No

No

X

X

X

X

X

X

-

1998

X

LN

LN

LN

LN

X

X

X

X

X

X

1999

X

No

LN

LN

X

X

X

X

X

X

... .1992-1999

X

LN

LN

LN

LN

X

X

X

X

X

X

1992

X

No

-

No

LN

X

X

X

X

X

X

1993

X

No

- - -

X

X

X

X

X

X

1994

X

LN

-N°

LN

X

X

X

X

X

X

1995

X

No

- -

LN

X

X

X

X

X

X

I.I.2-T

1996

X

LN

LN

No

X

X

X

X

X

X

CA

1997

X

No

LN

X

X

X

X

X

X

199B i 1999

X i X

x i x:

No ! LN

" i *! Rool

LN i

X ' X

X X

X ; X

x ! x

X X

x i x

1992 1999

X

LN

Rool

X

X

X

X

X

X

1992

LN

No

LN. .

No

LN

LN

X

X

X

X

X

1993

X

No

LN

No

X

X

x:

x

x

X

1994

X

No

LN

LN

X

X

X

X

x

X

1995

X

No

No

No

No

X

X

X

X

X

Arsen

1996

No

No

No

No

LN

X

X

X

X

X

c

1997

X

No

LN

No

LN

LN

X

X

X

x

X

1998

X

No

LN

No

No

X

X

X

X

X

x

1999

X

No

-

'

LN

No

LN

X

X

X

X

X

X

.,, --•1992-1999

LN

No

.

LN

LN

X

X

X

X

X

Table 7Bedrock Wells Statistical Trends -• 1992 to 1999 Data Compared lo 1986 to 1991 Combined Data

Bedrock

Wets

M0179-R

M0279-R

M0379-R

MM79-R

M0579-R

M0679-RS

M0679-RO

M0779-R

MOB79-R

M0979-R

M1079-R

M1179-R

M1289-R

M13B5-R

U148S-R

M1585-R

IGS-3Shalow

IGS-3De*p

Water Level

1992

No

No

No

No

No

No

No

1993

No

1994

No

No

No

No

No

No

No

No

No

No

No

No

No

No

(995

No

No

1996

No

No

No

No

No

No

No

1997

No

No

No

No

No

No

No

No

No

No

No

No

1998

No

No

Jotts Blank : No Transformation R«qu>ed

LN = Natual Log Transformation Requred

Root = Square Root Transformation Requred


X = Insufficient data to perform ttabsDcal anafyss

1999'

.

. .

'

1992-1999

I No

j

NO No

,92

No

No

X

X

1993

LN

No

No

LN

- -

X

X

1994

No

No

No

X

X

1995

X

No

No

LN

.No

X

X

ONA

1996

No

No

No

No

No

X

X

1997

LN

LN

No

LN

No

X

X

1998

No

LN

No

... .

LN

LN

X

X

1999

No

IN

Root

LN

Root

X

X

ISM-ISM

LN

_ LN—Root

LN

LN

X

X

X

1992

No

LN

_™

No

No

X

X

1993

No

No

LN

X

X

1994

LN

No

LN

No

X

_*...

1995

Root

LN

No

No

X

*

1.1.2-T

1996

LN

No

LN

No

X

X

CA

1997

LN

IN

LN

X

X

1998

No

No

X

No

X

X

1999

LN

LN

LN

LN

X

X

>

1992-1999

X

No

LN

X

X

1992

NO

IIU

LN

1993

X

No

LN

X

1994

X

LN

LN

' —

LN

X

1995

LN

X

No

No

LN

LN

LN

Arsen

.!2*LLN

No

No

No

LN

No

LN

LN

— -

c

1997

No

X

LN

LN

No

No

X

1998

LN

X

No

No

. . ._

No

LN

LN

X

1999

No

X

LN

LN

-"-" '

No

LN

X

1992-1999

LN

Root

LN

LN

X

X

Table 8Ground Water Collection System Statistical Trends - 1992 to 1999 Data Compared to 1986 to 1991 Combined Data

Diversion

Wall

Diver Wall

Notes:

1992

Blank

LN

Root

No

X

1993 1994

No

Flow Arsenic

1995 1996 1997 1998 1999 1992-1999 1992 1993 1994 1995 1996 1997 1998 1999 1992-1999. - ... _„ _ . . ..... !

No No Root LN LN LN LN

= No Transformation Required.

= Natural Log Transformation Required.

= Square Root Transformation Required.

= Neither Transformation Successful.

= Insufficient data to perform statistical analysis.

WELL NO. M0379-A

MONTH

OCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUN.JULAUGSEPOCTNOVDECJANFEBMARAPRMAY

197919791979198019801980198019801980198019801980198019801980198119811981198119811981198119811981198119811981198219821982198219821982198219821982198219821982198319831983198319831983198319831983198319831983.19841984198419841984

WATER LEVEL(ft.)

1.0000NO SAMPLE

1003.40001003.49001002.50001002.10001002.19001003.81001002.84001002.65001002.83001002.85001.004.00001002.89001002.60001001.98001001.64001001.30001002.95001002.09001002.61001002.72001003.29001003.63001003.14001002.70001002.51001002.96001002.55001001.98001004.07001003.35001003.87001004.08001003.29001003.25001002.79001002.75001002.51001002.95001003.12001002.18001003.91001004.24001004.06001003.97001004.05001003.02001002.97001003.64001003.60001003.78001003.1600 .1002.11001003.65001004.37001004.0600

ONA 1.1.2TCA ARSENIC(PPb) (ppb)

0.0158.8

0.420.48

183.7

0.78071

4.50.012

;i • 12 I• .." 4.2- :

5.21 -1.5

3.35.32.1

0.870.84

1.42.92.72.22.41.92.12.4

0.931.13.4

0.29- 0.84

- 1.3 ..2

2.43.31.2

10.170.590.320.360.03

0.0075 ND0.05

0.10.160.480.14

0.20.18 •

. 0.1 10.090.060.120.1

0.07

(ppm)5

45.814

160111650

97

131612 '26 ,

: 57

91913117

412.5 ND

7181210209

109

2.5 ND8

116

'' i 7 '2.5 ND

58

2.5 ND2.5 ND15

2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

.2.5 ND2.5 ND2.5 ND -2.5 ND

0.0010.0050.0150.0040.0040.0040.003

0.010.001 ND0.004 ;.0.0050:006

0.0090:0050.0090.01

0.0070.0090.0080.0050.0040.0070.0080.0120.0040.01

0.0150.0240.0080.009 ,0.0030.0190:0040:0050.0080.0050.0120.010.01

0.0080.0080.0110.0030.0060.0030.0050.0040.0060.0070.0080.004 .0.0050:0050.0060.0040.001 ND0.002

PRF

JUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCT

-NOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUN

198419841984198419841984198419851985198519851985198519851985198519851985198519861986198619861986198619861986198619861986198619871987198719871987198719871987198719871987 -1987198819881988198819881988198819881988198819881988198919891989198919891989

1003.98001003.77001002.80001002.69001002.43001004.06001003 50001003.33001001.69001003.25001003.97001003.92001003.13001002.75001002.00001003.94001003.41001004.37001003.32001003.25001002.57001002.30001003.97001004.02001003.96001003.82001003.65001003.06001004.07001003.21001003.80001001.64001002.19001002.46001003.87001003.72001003.39001002.74001003.97001003.94001002.87001002:77001003.48001002.88001002.53001002.86001002.91001003.95001003.17001003.05001002.69001003.26001002.86001002.48001003.67001002.74001002.79001002.23001002.41001003.27001003.1100

81 -85 Avg 1003.2 81-85Va0.551 # of Samples 60

0.0075 ND0.060 340.17009

0.0800.06

0.0400.0200.015

0.0075 ND0.0200.0701.2000.030

0.0075 ND0.0075 ND0.150

0.0075 ND0.0400.0600.0600.030

0.0075 ND0.020

0.0075 ND0.0200.100

0.0075 ND0.2900.0590.133

0.0075 ND0.0290.022

0.0075 ND0.0610.0430.0290.0280.3190.0270.0260.1850.1560.0440.019

0.0075 ND0.0075 ND0.0790.0480.0270.032

NO SAMPLENO SAMPLE

2.5 NDNO SAMPLENO SAMPLE


2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

5.000 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

NO SAMPLENO SAMPLE



0.0030.0050.0030.0040.0070.0030.0020.001 ND0.0020.0020.001 ND0.0020.001 ND0.0030.0030.0030.0030.001 ND0.0030.0060.008

0.0005 ND0.0010.0020.0030.0020.003

0.0005 ND0.0005 ND0.0050.0080.003

0.0005 ND0.0010.0030.0010.002

0.0005 ND0.001

0.0005 ND0.0005 ND0:001 -

0.0005 ND0.0005 ND0.0010.0010.0020.0020.0020.0020.001

0.0005 ND0.001

NO SAMPLENO SAMPLE


0.001NO SAMPLENO SAMPLE

81 - 85 Avg 0.0059 81 - 85 VaCE-05 # of SamplesGO

oansoR

JUL 1989AUG 1989SEP 1989OCT 1989NOV 1989DEC 1989JAN 1990FEB 1990MAR 1990APR 1990MAY 1990JUN 1990JUL 1990AUG 1990SEP 1990OCT 1990NOV 1990DEC 1990JAN 1991FEB 1991MAR 1991APR 1991MAY 1991JUN 1991JUL 1991AUG 1991SEP 1991OCT 1991NOV 1991DEC 1991JAN 1992FEB 1992MAR 1992APR 1992MAY 1992JUN 1992JUL 1992AUG 1992SEP 1992OCT 1992NOV 1992DEC 1992JAN 1993FEB 1993MAR 1993APR 1993MAY 1993JUN 1993JUL 1993AUG 1993SEP 1993OCT 1993NOV 1993DEC 1993JAN 1994FEB 1994MAR 1994APR 1994MAY 1994JUN 1994JUL 1994

1003.03001002.64001003.31001002.66001002.92001002.47001001.89001002.27001001.97001003.24001003.80001003.80001003.82001004.16001003.92001003.72001002.79001002.40001002.15001002.81001003.05001004.37001004.06001003.97001003.72001003.02001002.66001002.85001003.84001004.02001003.7200

10041004.011003.951003.831002.531002.761003.941003.95

1002.71003.581003.831002.811002.841002.741004.321004.07

10041004.041004.171003.951002.981002.711002.551002.381001.911002.311003.631003.411004.07

1004.190

81-85Avg 1003.292Avg 1003.681-85Avg 1003.2

U1-U2-0.38

Calculated T | -1.702Reference T 1 .645Significant Difference

81 -85Va0.55192Var 0.31481 -85Va0.551

# of Samples# of Samples# of Samples

root of Var Deg of Freedom5.99569 26.83

-1.645Var. Test 1Var. Test 2

1992 - 1999 Results Significantly Higher

93Avg 1003.481-85Avg 1003.2

U1-U2-0.245

Calculated T [3^91Reference T 1 .645

93 Var 0.49381 -85Va0.551

# of Samples# of Samples



NO SIGNIFICANT DIFFERENCE EXISTS0

94Avg 1003.181-85Avg 1003.2

U1-U20.0488

Calculated T (jjjrfT

94 Var 0.54181 -85Va0.551



Var. Test 1










2.5 NDNO SAMPLE

60 NO SAMPLE12 2.5 ND60 NO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

Pass 2.5 NDPass NO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

12 2.5 ND60 NO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

Pass 2.5 NDPass NO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

12 2.5 ND60 NO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

Pass 2.5 ND





















2.5 ND





















0.0005 ND

81 - 85 Avg 0.005992Avg 0.001581 - 85 Avg 0.0059

U1-U2

81 -85VaBE-0592 Var 2E-0681 - 85 VaCE-05

,

# of Samples60# of Samples4# of Samples60

root of Var Deg of Freedom0.0044 0.03335 15.492

Calculated T[ 2.044Reference T 1 .645Significant Difference

-1.645Var. Test 1 PassVar. Test 2 Fail

1992 - 1999 Results Significantly Lower

93 Avg 0.001381 - 85 Avg 0.0059

U1-U20.0046

Calculated T | 2.139 .Reference T 1.645Significant Difference

93 Var 8E-0781 - 85 VaCE-05

# of Samples4# of Samples60


-1.645Var. Test 1 PassVar. Test 2 Fail

1992 - 1999 Results Significantly Lower

94 Avg 0.000581 - 85 Avg 0.0059

U1-U20.0054

Calculated T ['.2.514 "

94 Var 081 -85Va2E-05



Var. Test 1 Pass

PRE diversion wall comparison

AUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC

~JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUG

1994

1994

1994

1994

1994

1995

1995

1995

1995

1995

1995

1995

1995

1995

1995

1995

1995

1996

1996

1996

1996

1996

1996

1996

1996

1996

1996

1996

1996

1997

1997

1997

1997

1997

1997

1997

1997

1997

1997

1997

1997

1998

1998

1998

1998

1998

1998

1998

1998

1998

1998

1998

1998

1999

1999

1999

1999

1999

1999

1999

1999

1003.921003.191003.071002.67

1002.91002.8

1002.491003.9

1004.171004.18

1004

1004.011002.921003.1

1003.171002.921002.731002.471002.511002.671003.171003.991004.151003.511003.511003.361002.911003.831004.201004.011002.711003.331003.931004.091003.541003.351003.511003.271003.941003.021002.471002.701002.201004.051004.271004.001003.601003.851003.521003.931003.311003.321002.991002.421002.661002.531004.271003.951004.031003.461003.99

Reference T 1.645 -1.645 Var. Test 2 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1 .645 -1.645 Var. Tesl 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference0 2.5 ND 2.5 ND 0.0005 ND 1992 - 1999 Results Significantly Lower

NO SAMPLE NO SAMPLE NO SAMPLENO SAMPLE NO SAMPLE NO SAMPLE

95Avg 10034 95 Var 0.401 # of Samples 12 2.5 ND 2.5 ND 0.0005 ND 95 Avg 0.0011 95 Var 4E-07 # of Samples481-85Avg 1003.2 81-85Va0.551 # of Samples 60 NO SAMPLE NO SAMPLE NO SAMPLE 81 - 85 Avg 0.0059 81-85VaCE-05 # of Samples60

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.001 U1-U2 root of Var Deg of Freedom-0.179 6.07469 26.83 NO SAMPLE NO SAMPLE NO SAMPLE 0.0048 0.0333 15.492

NO SAMPLE NO SAMPLE NO SAMPLECalculated T | -6.793 | Var. Test 1 Pass 2.5 ND 2.5 ND 0.001 Calculated T| 2.233 Var. Test 1 PassReference T 1.645 -1.645 Var. Test 2 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1 .645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference0 2.5 ND 2.5 ND 0.002 1992 - 1999 Results Significantly Lower


96 Avg 1003.4 96 Var 0.384 # of Samples 12 2.5 ND 2.5 ND 0.0005 ND 96 Avg 0.0005 96 Var 0 # of Samples481 -85 Avg 1003.2 81 - 85 VaO.551 # of Samples 60 NO SAMPLE NO SAMPLE NO SAMPLE 81 - 85 Avg 0.0059 81 - 85 VaCE-05 # of Samples60

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.0005 ND U1-U2 root of Var Deg of Freedom-0.17 6.05916 26.83 NO SAMPLE NO SAMPLE NO SAMPLE 0.0054 0.03328 15.492

NO SAMPLE NO SAMPLE NO SAMPLECalculated T [ -0.755" | Var. Test 1 Pass 2.5 ND 2.5 ND 0.0005 ND Calculated T| 2.514 Var. Test 1 PassReferenceT 1.645 "-1.645 Var. Test 2 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1.645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference0 2.5 ND 2.5 ND 0.0005 ND 1992 - 1999 Results Significantly Lower


97 Avg 1003.4 97 Var 0.268 tfofSamples 12 2.5 ND 2.5 ND 0.001 97 Avg 0.0006 97 Var 6E-08 #ofSamples481-85Avg 1003.2 81-85Va0.551 # of Samples 60 NO SAMPLE NO SAMPLE NO SAMPLE 81 - 85 Avg 0.0059 81-85Va2E-05 #ofSamples60


NO SAMPLE NO SAMPLE NO SAMPLECalculated T Q-1/102 | Var. Test 1 Pass 2.5 ND 2.5 ND 0.0005 ND Calculated T I 2.467 Var. Test 1 PassReferenceT 1.645 " -1.645 Var. Test 2 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1.645 " -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference0 2.5 ND 2.5 ND 0.0005 ND 1992 - 1999 Results Significantly Lower


98 Avg 1003.5 98 Var 0.374 # of Samples 12 2.5 ND 2.5 ND 0.001 ND 98 Avg 0.002 98 Var 4E-06 #ofSamples481 -85 Avg 1003.2 81 - 85 VaO.551 # of Samples 60 NO SAMPLE NO SAMPLE NO SAMPLE 81 - 85 Avg 0.0059 81-85VaEE-05 #ofSamples60


NO SAMPLE NO SAMPLE NO SAMPLECalculated T [-1.295] Var. Test 1 Pass 2.5 ND 2.5 ND 0.001 ND Calculated T 1.806" Var. Test 1 PassReferenceT 1.645 -1.645 Var. Test 2 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1 .645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference0 2.5 ND 2.5 ND 0.005 1992 - 1999 Results Significantly Lower


99 Avg 1003.1 99 Var 0.845 # of Samples 12 2.5 ND 2.5 ND 0.001 ND 99 Avg 0.0013 99 Var 3E-07 #ofSamples481-85Avg 1003.2 81-85Va0.551 #ofSamples60 NO SAMPLE NO SAMPLE NO SAMPLE 81-85Avg 0.0059 81-85Va2E-05 #ofSamples60

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.001 ND U1-U2 root of Var Deg of Freedom01038 6.46418 2683 NO SAMPLE NO SAMPLE NO SAMPLE 0.0046 0.03329 15.492

NO SAMPLE NO SAMPLE NO SAMPLECalculated T 0.431 2.5 ND 2.5 ND 0.002 Calculated T 2.141ReferenceT 1 .645 -1 .645 Var. Test 1 Pass NO SAMPLE NO SAMPLE NO SAMPLE Reference T 1 .645 -1.645 Var. Test 1 Pass

SEPOCTNOVDEC

1999

1999

1999

1999

1003.751001

1002

1002

.61

.28

.04

NO0

92-81 -

SIGNIFICANT DIFFERENCE EXISTS

99 Avg85Avg

1003.41003.2

U1-U2-0.17

92 - 99 VaO.44481 -85Va0.551

Var. Test 2


Pa

9660


Pass NO SAMPLE NO SAMPLE NO SAMPLE Significant Difference2.5 ND 2.5 ND 0.001 ND 1992 - 1999 Results Significantly Lower


Calculated T |_-jM93jReference T 1.645 -1.645NO SIGNIFICANT DIFFERENCE EXISTS0

Var. Test 1Var. Test 2

PassPass

92-99 Avg 0.001181 - 85 Avg 0.0059

U1-U20.0048

92 - 99 VaSE-0781 -85Va2E-05

Var. Test 2 Fail



Calculated T j 6.24 |Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassFail

NATURAL LOG TRANSFORMATION

MONTHJAN 1981

FEB 1981

MAR 1981

APR 1981

MAY 1981

JUN 1981

JUL 1981

AUG 1981

SEP 1981

OCT 1981

NOV 1981

DEC 1981

JAN 1982

FEB 1982

MAR 1982

APR 1982

MAY 1982

JUN 1982

JUL 1982

AUG 1982

SEP 1982

OCT 1982

NOV 1982

DEC 1982

JAN 1983

FEB 1983

MAR 1983

APR 1983

MAY 1983

JUN 1983

JUL 1983

AUG 1983

SEP 1983

OCT 1983

NOV 1983

DEC 1983

JAN 1984

FEB 1984

MAR 1984

APR 1984

MAY 1984

WATER LEVEL(ft.)6.90939396.90905446.91070096.90984316.91036196.91047166.91103996.91137876.91089046.91045166.91026216.91071096.9103026.90973336.9118176.91109976.91161786.9118276.9110399

6.9116.91054146.91050156.91026216.91070096.91087046.90993296.91165776.91198636.91180716.91171746.91179716.91077076.91072096.91138876.91134886.91152826.91091036.90986316.91139866.91211586.9118071

ARSENIC(ppm)

-4.9618451-4.7105307-4.8283137-5.2983174-5.5214609-4.9618451-4.8283137-4.4228486-5.5214609-4.6051702-4.1997051-3.7297014-4.8283137-4.7105307-5.809143

-3.9633163-5.5214609-5.2983174-4.8283137-5.2983174-4.4228486^t.6051702-4.6051702-4.8283137-4.8283137

-4.50986-5.809143

-5.1159958-5.809143

-5.2983174-5.5214609-5.1159958-4.9618451.8283137

-5.5214609-5.2983174-5.2983174-5.1159958-5.5214609-6.9077553-6.2146081


JUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUN

1984

1984

1984

1984

1984

1984

1984

1985

1985

1985

1985

1985

1985

1985

1985

1985

1985

1985

1985

1992

1992

1992

1992

1992

1992

1992

1992

1992

1992

1992

1992

1993

1993

1993

1993

1993

1993

1993

1993

1993

1993

1993

1993

1994

1994

1994

1994

1994

1994

1994

1994

1994

1994

1994

1994

1995

1995

1995

1995

1995

1995

6.91172746.91151826.91055146.91044176.91018236.91180716.91124926.91107976.9094439

6.9116.91171746.91166766.91088046.91050156.90975336.91168756.91115956.91211586.91106986.91146846.91174736.91175736.91169756.911578

6.91028216.91051.156.91168756.91169756.91045166.9113289

6.9115786.91056136.91059136.91049156.9120666.911817

6.91174736.91178716.91191666.91169756.91073086.91046166.910302

6.91013256.90966356.91006266.91137876.91115956.911817

6.91193656.91166766.91094026.91082066.91042176.91065116.91055146.91024226.91164776.91191666.91192666.9117473

81 -85 Avg 6.910992 Avg 6.911381 -85 Avg 6.9109

Calculated TReference T

U1-U2-4E-04

-1.782"i.645

81 - 85 VaO.OOO92 Var 0.00081 - 85 VaO.OOO


591259


-1.645Var. Test 1Var Test 2

PassPass

Significant Difference1992 - 1999 Results Significantly Higher

93 Avg 6.911381 -85 Avg 6.9109


U1-U2-4E-04

'"-1.752"1.645

93 Var 0.00081 -85 VaO.OOO


1259

root of VarDeg of Freedom0.00608 26.61

-1.645Var. Test 1Var Test 2

PassPass


94 Avg81 - 85 Avg


6.91096.9109

U1-U20

~~(F~

1.645

94 Var 0.00081 - 85 VaO.OOO


1259



PassPass


95 Avg81 - 85 Avg

Calculated T

6.91116.9109

U1-U2-2E-04

-O88~T

95 Var 0.00081 -85 VaO.OOO


1259

root of VarDeg of Freedom0.00604 26.61

Var. Test 1 Pass

-5.809143-5.2983174-5.809143-5.5214609-4.9618451-5.809143-6.2146081-6.9077553-6.2146081-6.2146081-6.9077553-6.2146081-6.9077553-5.809143-5.809143-5.809143-5.809143-6.9077553-5.809143-6.2146081

-5.809143

-7.6009025

-7.6009025

-7.6009025

-6.2146081

-7.6009025

-6.2146081

-7.6009025

-7.6009025

-7.6009025

-7.6009025

-7.6009025

-6.9077553

81 -85 Avg -5.37292 Avg -6.60781 - 85 Avg -5.372

U1-U21.2354

81 - 85 VaO.545392 Var 0.850781 - 85 VaO.5453

# of Samples59#ofSamples5#ofSamples59


Calculated T | 3.585 |Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

93 Avg -6.908 93 Var 0.6406 # of Samples481-85 Avg -5.372 81 - 85 VaO.5453 #ofSamples59

U1-U2 root of Var Deg of Freedom1.5363 5.79211 15.362

Calculated T | 4.075Reference T 1.645" -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

94 Avg -7.60181 -85 Avg -5.372

94 Var 081 -85 VaO.5453



Calculated TI (Tog jReference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower

Var. Test 1 PassVar. Test 2 Fail

95 Avg -6.908 95 Var 0.3203 #ofSamples481-85 Avg -5.372 81 - 85 VaO.5453 #ofSamples59


Calculated T [~4.1J34^ J Var. Test 1 Pass

JULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC

199519951995199519951995199619961996199619961996199619961996199619961996199719971997199719971997199719971997199719971997199819981998199819981998199819981998199819981998199919991999199919991999199919991999199919991999

6.91175736.910671

6.91085056.9109203

6.9106716.91048166.91022226.91026216.91042176.91092036.91173736.91189676.91125916.91125916.91110966.9106611

6.9115786.91194656.9117573

.6.91046166.91107976.91167766.9118369

6.9112896.91109976.91125916.91101996.91168756.91077076.91022226.91045166.90995296.91179716.91201626.91174736.91134886.91159796.91126916.91167766.91105986.91106986.91074086.91017246.91041176.91028216.91201626.91169756.91177726.91120936.91173736.91149836.909364

6.91003276.9097932

Reference T 1.645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

96Avg 6.911 96 Var 0.00081 - 85 Avg 6.9109 81 - 85 VaO.OOO


1259

U 1 -U2 root of Var Deg of Freedom


-1E-04 0.006 26.61

-0.444l".645 :~ -1.645


PassPass


97 Avg81 - 85 Avg

6.9113 97 Var 0.0006.9109 81 -85 VaO.OOO


1259



-4E-04 0.00588 26.61

-1.809 |1.645 -1.645


PassPass


98 Avg81 - 85 Avg

6.9112 98 Var 0.0006.9109 81 -85 VaO.OOO


1259



-3E-04 0.00609 26.61

-1.31 |1.645 -1.645


PassPass


99 Avg81 - 85 Avg

6.9109 99 Var 0.0006.9109 81 -85 VaO.OOO


1259

U1 -U2 root of Var Deg of Freedom


0 0.00635 26.61

L_P__J1.645 -1.645


92 - 99 Avg 6.9111 92 -99 VaO.OOO


# of Samples

PassPass

9681-85 Avg 6.9109 81 - 85 VaO.OOO ~ # of Samples 59

U1-U2 root of Var Deg of Freedom-2E-04 0.00851 75.26

Calculated T -T769"]Reference T 1.645 -1.645

-6.9077553

-6.2146081

-7.6009025

-7.6009025

-7.6009025

-7.6009025

-6.9077553

-7.6009025

-7.6009025

-7.6009025

-6.9077553

-6.9077553

-6.9077553

-5.2983174

-6.9077553

-6.9077553

-6.2146081

-6.9077553

Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower

Var. Test 2 Pass

96 Avg -7.60181 - 85 Avg -5.372

96 Var 0 # of Samples481 - 85 VaO.5453 # of Samples59


Calculated T | 6.09 \Reference T 1.645 ""-1.645Significant Difference1992 - 1999 Results Significantly Lower


97 Avg -7.428 97 Var 0.1201 #ofSamples481-85 Avg -5.372 81 - 85 VaO.5453 # of Samples59


Calculated T | 5.585^]Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassFail

98 Avg -6.505 98 Var 0.6476 #ofSamples481-85 Avg -5.372 81 - 85 VaO.5453 #ofSamples59

U1-U21.1339

rool of Var Deg of Freedom5.79391 15.362

Calculated T [ 1006 |Reference T i.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

99 Avg -6.73581 -85 Avg -5.372

99 Var 0.1201 #ofSamples481 - 85 VaO.5453 # of Samples59


Calculated T | 3702 |Reference T V645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


92-99 Avg -7.02481 - 85 Avg -5.372

92 - 99 VaO.4579 # of Samples3381 - 85 VaO.5453 # of Samples59


Var. Test 1 PassCalculated T | 10715 JReference T i.645" -1.645 Var. Test 1 Pass

PRE diversion wall comoarison


Var. Test 2 Pass Significant Difference1992 - 1999 Results Significantly Lower

Var. Test 2 Pass

ROOT TRANSFORMATION

MONTHJAN 1981FEB 1981MAR 1981APR 1981MAY 1981JUN 1981JUL 1981AUG 1981SEP 1981OCT 1981NOV 1981DEC 1981JAN 1982FEB 1982MAR 1982APR 1982MAY 1982JUN 1982JUL 1982AUG 1982SEP 1982OCT 1982NOV 1982DEC 1982JAN 1983FEB 1983MAR 1983APR 1983MAY 1983JUN 1983JUL 1983AUG 1983SEP 1983OCT 1983NOV 1983DEC 1983JAN 1984FEB 1984MAR 1984APR 1984MAY 1984JUN 1984

WATER LEVEL(ft.)31.64869731.64332531.66938631.65580531.66401731.66575431.67475331.6801231.67238531.66543931.66243831.66954431.6630731.65406831.68706431.6757

31.68390831.68722131.67475331.67412231.6668631.66622831.66243831.66938631.6720731.65722731.68453931.68974631.68690631.68548631.68674831.67049131.66970231.68027831.67964631.68248731.67270131.65612131.68043631.69179731.68690631.685643

ARSENIC(ppm)

0.0836660.094868330.089442720.070710680.063245550.083666

0.089442720.109544510.06324555

0.10.122474490.154919330.089442720.094868330.054772260.137840490.063245550.070710680.089442720.070710680.10954451

0.10.1

0.089442720.089442720.104880880.054772260.077459670.054772260.070710680.063245550.077459670.083666

0.089442720.063245550.070710680.070710680.077459670.063245550.031622780.044721360.05477226

JULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJUL

1984198419841984198419841985198519851985198519851985198519851985198519851992199219921992199219921992199219921992199219921993199319931993199319931993199319931993199319931994199419941994199419941994199419941994199419941995199519951995199519951995

31.68232931.66701831.66528131.66117531.68690631.67806831.67538531.64948731.67412231.68548631 .68469731.67222831.66622831 .65438431.68501231.67664831.69179731.67522731.68154

31.68595931.68611731.68517

31.68327631.66275431 .66638631.68501231.68517

31.66543931.67933131.68327631.66717531.66764931.66607

31.69100831.68706431.685959

31.6865931.68864131.68517

31.66985931.66559631.66307

31.66038531.65296231.6592831.68012

31.67664831.68706431.68895731.68469731.67317531.67128

31.66496531.66859631.66701831.66212231.68438131.68864131.68879931.68595931.686117

81 - 85 Avg92 Avg81 - 85 Avg


31.67331.67831.673

U1-U2-0.005

f-i".4911.645"

81 - 85 VaO.OOO92 Var 0.00081 -85 VaO.OOO


591259



PassPass


93 Avg81 - 85 Avg


31.67931.673

U1-U2-0.006

pTMST1.645

93 Var 0.00081 - 85 VaO.OOO


1259



PassPass


94 Avg81 - 85 Avg


31.67231.673

U1-U20.0012

fb 325 ~1.645

94 Var 0.00081 - 85 VaO.OOO


1259



PassPass


95 Avg81 - 85 Avg


31.67631.673

U1-U2-0.003

95 Var 0.00081 - 85 VaO.OOO


1259


|~O863"]1.645" -1.645


PassPass

0.070710680054772260.06324555

0.0836660.054772260.044721360.031622780.044721360.044721360.031622780.044721360.031622780.054772260.054772260.054772260.054772260.031622780.054772260.04472136

0.05477226

0.02236068

0.02236068

0.02236068

0.04472136

0.02236068

0.04472136

0.02236068

0.02236068

0.02236068

0.02236068

0.02236068

0.03162278

0.03162278

81 - 85 Avg 0.0727 81 - 85 VaO.0007 # of Samples5992 Avg 0.0398 92 Var 0.0003 #ofSamples581-85 Avg 0.0727 81 - 85 VaO.0007 #ofSamples59


Calculated T|^2.81_6~ |Reference T 1.645 ""-1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

93 Avg 0.0335 93 Var 0.0002 #ofSamples481-85 Avg 0.0727 81-85 VaO.0007 # of Samples59


Calculated T [ J3.023 |Reference T 1.645 "-1.645Significant Difference1992 - 1999 Results Significantly Lower


PassFail

94 Avg 0.0224 94 Var 0 #ofSamples481-85 Avg 0.0727 81 - 85 VaO.0007 # of Samples59


Calculated T Lj3.904_ | Var. Test 1Reference T 1.645 -V645 Var. Test 2Significant Difference1992 - 1999 Results Significantly Lower

PassFail

95 Avg 0.0326 95 Var 8E-05 #ofSamples481 - 85 Avg 0.0727 81 - 85 VaO.0007 # of Samples59


Calculated TQ3J 02 "Reference T 1.645 " -1.645


PassFail


AUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC

19951995199519951995199619961996199619961996199619961996199619961996199719971997199719971997199719971997199719971997199819981998199819981998199819981998199819981998199919991999199919991999199919991999199919991999

3131313131313131313131313131313131313131313131

668912671754672859668912665912661807662438664965672859685801688326678226678226675858668754683276689115686117665596675385684854687379678699

31.675731313131313131313131313131313131313131

678226674438685012670491661807665439657543.686748690219685959679646683592.678384.684854.675069.675227.670017.661017.664807


96Avg 31.67481-85Avg 31.673

U1-U2-8E-04


-0.2241 .645 "

96Var 000081 - 85 VaO 000


1259



PassPass


97Avg 31.67981-85Avg 31.673

U1-U2-0.006


-1.771.645

97 Var 0.00081 - 85 VaO.OOO

root of Var Deg of0.09319 26.61

-1.645


Freedom


1259

PassPass


98 Avg81 - 85 Avg


31.67731.673

U1-U2-0.004

-T.076~1.645

98 Var 0 00081 - 85 VaO 000

root of Var Deg of0.09648 26.61

-1.645


Freedom


1259

PassPass


99 Avg81 - 85 Avg

31.66275431.690219

31.67331.673

U1-U20.0004

99 Var 0 00081 - 85 VaO 000

root of Var Deg ol0.10061 2661


Freedom

1259

31.6851731313131313131

.686432

.677437

.685801

.682014

.648223

.658806

.655015


0^1061.645

]-1.645


92 - 99 Avg81 - 85 Avg

31.67631.673

92 - 99 VaO.OOO81 - 85 VaO.OOO



PassPass

9659

0.04472136

0.02236068

002236068

0.02236068

0.02236068

0.03162278

0.02236068

0.02236068

0.02236068

003162278

0.03162278

0.03162278

0.07071068

0.03162278

0.03162278

0.04472136

0.03162278

U1-U2 root of Var Deg of Freedom-0.003 0.13476 75.26

Calculated T | -1J52Reference T i".645~~ -1.645NO SIGNIFICANT DIFFERENCE EXISTS

Significant Difference1992 - 1999 Results Significantly Lower

96 Avg 0.0224 96 Var 0 # of Samples481-85 Avg 0.0727 81 - 85 VaO.0007 #ofSamples59


Calculated T 3.904 |Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassFail

97 Avg 0.0247 97 Var 2E-05 # of Samples481 - 85 Avg 0.0727 81 - 85 VaO.0007 # of Samples59




PassFail

98 Avg 0.0414 98 Var 0.0004 # of Samples481-85 Avg 0.0727 81 - 85 VaO.0007 # of Samples59


Calculated T| 2.394 |Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

99 Avg 0.0349 99 Var 4E-05 # of Samples481-85 Avg 0.0727 81 - 85 VaO.0007 #ofSamples59


Calculated T | 2.929 |Reference T 1.645" -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassFail

92-99 Avg 0.0317 92 - 99 VaO.0002 #ofSamples3381-85 Avg 0.0727 81 - 85 VaO.0007 # of Samples59



PassPass

Calculated T [8.624 |Reference T 1.645 -1.645Significant Difference


T3

LLJo:Q_

I

i

((<i

<((

c

WELL NO. M0379-A

MONTH

OCT 1979NOV 1979DEC 1979JAN 1980FEE 1980MAR 1980APR 1980MAY 1980JUN 1980JUL 1980AUG 1980SEP 1980OCT 1980NOV 1980DEC 1980JAN 1981FEB 1981MAR 1981APR 1981MAY 1981JUN 1981JUL 1981AUG 1981SEP 1981OCT 1981NOV 1981DEC 1981JAN 1982FEB 1982MAR 1982APR 1982MAY 1982JUN 1982JUL 1982AUG 1982SEP 1982OCT 1982NOV 1982DEC 1982JAN 1983FEB 1983MAR 1983APR 1983MAY 1983JUN 1983JUL 1983AUG 1983SEP 1983OCT 1983NOV 1983DEC 1983JAN 1984FEB 1984MAR 1984APR 1984

WATER LEVEL(ft.)

1 .0000NO SAMPLE

1003.40001003.49001002.50001002.10001002.19001003.81001002.84001002.65001002.83001002.85001004.00001002.89001002.60001001.98001001.64001001.30001002.95001002.09001002.61001002.72001003.29001003.63001003.14001002.70001002.51001002.96001002.55001001.98001004.07001003.35001003.87001004.08001003.29001003.25001002.79001002.75001002.51001002.95001003.12001002.18001003.91001004.24001004.06001003.97001004.05001003.02001002.97001003.64001003.60001003.78001003.16001002.11001003.65001004.3700

ONA(PPb)

0.0158.8

0.420.48

183.7

0.780.714.5

0.01212

4.25.21.53.35.32.1

0.870.84

1.42.92.72.22.4

'1.92.12.4

0.931.13.4

0.290.84

1.32

2.43.31.2

10.170.590.320.360.03

0.0075 ND0.050.1

0.160.480.140.2

0.180.110.090.060.120.1

1.1.2TCA(PPb)

545.8

1416011165097

13161226579

1913117

412.5 ND

718121020

9109

2.5 ND8

1167

2.5 ND58

2.5 ND2.5 ND15

2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

ARSENIC(ppm)

0.0010.0050.0150.0040.0040.0040.003

0.010.001 ND0.0040.0050.0060.0090.0050.009

0.010.0070.0090.0080.0050.0040.0070.0080.0120.0040.01 •

0.0150.0240.0080.0090.0030.0190.0040.0050.0080.0050.012

0.010.01

0.0080.0080.0110.0030.0060.0030.0050.0040.0060.0070.0080.0040.0050.0050.0060.0040.001 ND

post diversion wall comparison

MAY 1984JUN 1984JUL 1984AUG 1984SEP 1984OCT 1984NOV 1984DEC 1984JAN 1985FEB 1985MAR 1985APR 1985MAY 1985JUN 1985JUL 1985AUG 1985SEP 1985OCT 1985NOV 1985DEC 1985JAN 1986FEB 1986MAR 1986APR 1986MAY 1986JUN 1986JUL 1986AUG 1986SEP 1986OCT 1986NOV 1986DEC 1986JAN 1987FEB 1987MAR 1987APR 1987MAY 1987JUN 1987JUL 1987AUG 1987SEP 1987OCT 1987NOV 1987DEC 1987JAN 1988FEB 1988MAR 1988APR 1988MAY 1988JUN 1988JUL 1988AUG 1988SEP 1988OCT 1988NOV 1988DEC 1988JAN 1989FEB 1989MAR 1989APR 1989

1004.06001003.98001003.77001002.80001002.69001002.43001004.06001003.50001003.33001001.69001003.25001003.97001003.92001003.13001002.75001002.00001003.94001003.41001004.37001003.32001003.25001002.57001002.30001003.97001004.02001003.96001003.82001003.65001003.06001004.07001003.21001003.80001001.64001002.19001002.46001003.87001003.72001003.39001002.74001003.97001003:94001002.87001002.77001003.48001002.88001002.53001002.86001002.91001003.95001003.17001003.05001002.69001003.26001002.86001002.48001003.67001002.74001002.79001002.23001002.4100

0.070.0075 ND

0.060.340.170.09

0.0800.06

0.0400.0200.015

0.0075 ND0.0200.0701.2000.030

0.0075 ND0.0075 ND

0.1500.0075 ND

0.0400.0600.0600.030

0.0075 ND0.020

0.0075 ND0.0200.100

0.0075 ND0.2900.0590.133

0.0075 ND0.0290.022

0.0075 ND0.0610.0430.0290.0280.3190.0270.0260.1850.1560.0440.019

0.0075 ND0.0075 ND0.0790.0480.0270.032

NO SAMPLENO SAMPLE


2.5 ND

2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

5.000 ND2.5 ND2.5 ND25 ND2.5 ND2.5 ND2.5 ND25 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND25 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND2.5 ND

NO SAMPLENO SAMPLE


2.5 ND

0.0020.0030.0050.0030.0040.0070.0030.0020.001 ND0.0020.0020.001 ND0.0020.001 ND0.0030.0030.0030.0030.001 ND0.0030.0060.008

0.0005 ND0.0010.0020.0030.0020.003

0.0005 ND0.0005 ND

0.0050.0080.003

0.0005 ND0.0010.0030.0010.002

0.0005 ND0.001

0.0005 ND0.0005 ND

0.0010.0005 ND0.0005 ND

0.0010.0010.0020.0020.0020.0020.001

0.0005 ND0.001

NO SAMPLENO SAMPLE


0.001

com]


1003.27001003.11001003.03001002.64001003.31001002.66001002.92001002.47001001.89001002.27001001.97001003.24001003.80001003.80001003.82001004.16001003.92001003.72001002.79001002.40001002.15001002.81001003.05001004.37001004.06001003.97001003.72001003.02001002.66001002.85001003.84001004.02001003.7200

10041004.011003.951003.831002.531002.761003.941003.951002.7

1003.581003.831002.811002.841002.741004.321004.07

10041004.041004.171003.951002.981002.711002.551002.381001.911002.311003.63

NO SAMPLENO SAMPLE










2.5 ND

86-91Avg 100392Avg 1004 .86-91Avg 1003

U1-U2-0.42

Calculated T QJTPReference T 1 .645Significant Difference

86-91 VaO.426192Var 0.314286 - 91 VaO.4261

# of Samples 72# of Samples 12# of Sam pies 72


I-1.645

Var. Test 1 PassVar. Test 2 Pass

1992 - 1999 Results Significantly Higher

93Avg 100386-91Avg 1003

U1-U2-0.28

Calculated T Qj38Reference T 1.645

93 Var 0.492886 - 91 VaO.4261

# of Samples 12# of Samples 72


I-1.645 '



94Avg 100386-91Avg 1003

U1-U2

94 Var 0.541386 - 91 VaO.4261


root of Var Deg of Freedom

NO SAMPLEO SAMPLE

2.5 NDO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

2.5 NDO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

2.5 NDO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

2.5 NDO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE

2.5 NDO SAMPLE

NO SAMPLE2.5 ND

NO SAMPLENO SAMPLE




















2.5 ND

NO SAMPLENO SAMPLE




















0.0005 ND

ARSENIC

86 - 91 Avg92 Avg86 - 91 Avg


0.0020.0020.002

U1-U20.000

[03321 .645

86 - 91 VaGE-0692 Var 2E-0686 - 91 VaGE-06

# of Samples46# of Samples4#of Samples46


I-1.645


NO SIGNIFICANT DIFFERENCE EXISTS.0

93 Avg86 - 91 Avg


0.0010.002

U1-U20.000

[05571.645

93 Var 8E-0786 - 91 Va6E-06

#ofSamples4# of Samples 46


"I-1.645



94 Avg86 - 91 Avg

0.0010.002

U1-U2

94 Var 086 - 91 VaOE-06

# of Samples4#ofSamples46

root of Var Deg of Freedom



1003.411004.07

1004.1901003.921003.191003.071002.67

1002.91002.8

1002.491003.9

1004.171004.18

10041004.011002.92

1003.11003.171002.921002.731002.471002.511002.671003.171003.991004.151003.511003.511003.361002.911003.831004.201004.011002.711003.331003.931004.091003.541003.351003.511003.271003.941003.021002.471002.701002.201004.051004.271004.001003.601003.851003.521003.931003.311003.321002.991002.421002.661002.531004.27

0.014 6.01732 29.394 NO SAMPLE NO SAMPLE NO SAMPLE 0.001 0.01208 13.565

Calculated TNO SAMPLE NO SAMPLE NO SAMPLE

0.068 Var Test 1 Pass 2.5 ND 2.5 ND 0.0005 ND Calculated T 1.46 Var. Test 1 PassReferenceT 1.645 -1.645 Var. Test 2 Pass O SAMPLE NO SAMPLE NO SAMPLE Reference T 1.645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE NO SIGNIFICANT DIFFERENCE EXISTS0 2.5 ND 2.5 ND 0.0005 ND 0


95Avg 1003 95 Var 04009 #ofSamples12 2.5 ND 2.5 ND 0.0005 ND 95 Avg 0.001 95 Var 4E-07 #ofSamples486 - 91 Avg 1003 86 - 91 VaO.4261 # of Samples 72 O SAMPLE NO SAMPLE NO SAMPLE 86 - 91 Avg 0.002 86 - 91 VaOE-06 # of Samples46

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.001 U1-U2 root of Var Deg of Freedom-0.21 588763 29394 NO SAMPLE NO SAMPLE NO SAMPLE 0.001 0.01213 13.565


NO SAMPLE NO SAMPLE NO SAMPLE-1.07 Var. Test 1 Pass 2.5 ND 2.5 ND 0.001 Calculated T 0.783 Var. Test 1 Pass

1.645 -1.645 Var. Test 2 Pass O SAMPLE NO SAMPLE NO SAMPLE ReferenceT 1.645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE NO SIGNIFICANT DIFFERENCE EXISTS0

96 Avg86-91 Avg

2.5 ND 2.5 ND 0.002 0NO SAMPLE NO SAMPLE NO SAMPLENO SAMPLE NO SAMPLE NO SAMPLE

1003 96Var 03838 #ofSamples12 2.5 ND 2.5 ND 0.0005 ND 96 Avg 0.001 96Var 0 #ofSamples41003 86 - 91 VaO.4261 # of Samples 72 O SAMPLE NO SAMPLE NO SAMPLE 86 -91 Avg 0.002 86 - 91 VaGE-06 #ofSamples46



NO SAMPLE NO SAMPLE NO SAMPLE"-"1.03 | Var. Test 1 Pass 2.5 ND 2.5 ND 0.0005 ND Calculated T 1.46" Var. Test 1 Pass

1.645-1.645 Var. Test 2 Pass O SAMPLE NO SAMPLE NO SAMPLE ReferenceT l".645 " -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE NO SIGNIFICANT DIFFERENCE EXISTS0

97 Avg86 - 91 Avg

'2.5 ND 2.5 ND 0.0005 ND 0NO SAMPLE NO SAMPLE NO SAMPLENO SAMPLE NO SAMPLE NO SAMPLE

1003 97Var 0.2682 #ofSamples12 2.5 ND 2.5 ND 0.001 97 Avg 0.001 97 Var 6E-08 #ofSamples41003 86 - 91 VaO.4261 # of Samples 72 O SAMPLE NO SAMPLE NO SAMPLE 86 - 91 Avg 0.002 86 - 91 VaOE-06 #ofSamples46


NO SAMPLE NO SAMPLE NO SAMPLECalculated T [~-T43 Var. Test 1 Pass 2.5 ND 2.5 ND 0.0005 ND Calculated T T.347 Var. Test 1 PassReference T 1.645 -1.645 Var. Test 2 Pass O SAMPLE NO SAMPLE NO SAMPLE ReferenceT 1.645 -1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE NO SIGNIFICANT DIFFERENCE EXISTS0

98 Avg86 - 91 Avg


2.5 ND 2.5 ND 0.0005 ND 0NO SAMPLE NO SAMPLE NO SAMPLENO SAMPLE NO SAMPLE NO SAMPLE

1003 98Var 0.3742 #ofSamples12 2.5 ND 2.5 ND 0.001 ND 98 Avg 0.002 98 Var 4E-06 #ofSamples41003 86-91 VaO.4261 # of Samples 72 O SAMPLE NO SAMPLE NO SAMPLE 86 - 91 Avg 0.002 86 - 91 VaOE-06 #ofSamples46

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.001 ND U1-U2 root of Var Deg of Freedom-0.33 5.86262 29.394 NO SAMPLE NO SAMPLE NO SAMPLE -0.00 0.01256 13.565

NO SAMPLE NO SAMPLE NO SAMPLE-1.64 ~ Var. Test 1 Pass 2.5 ND 2.5 ND 0.001 ND Calculated T -022 Var. Test 1 Pass

f645~"-1.645 Var. Test 2 Pass O SAMPLE NO SAMPLE NO SAMPLE ReferenceT 1.645" -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS NO SAMPLE NO SAMPLE NO SAMPLE NO SIGNIFICANT DIFFERENCE EXISTS0

99 Avg86 - 91 Avg

2.5 ND 2.5 ND 0.005 0NO SAMPLE NO SAMPLE NO SAMPLENO SAMPLE NO SAMPLE NO SAMPLE

1003 99Var 0.8449 #ofSamples12 2.5 ND 2.5 ND 0.001 ND 99 Avg 0.001 99 Var 3E-07 #ofSamples41003 86-91 VaO.4261 # of Samples 72 O SAMPLE NO SAMPLE NO SAMPLE 86 - 91 Avg 0.002 86 - 91 VaOE-06 #ofSamples46

NO SAMPLE NO SAMPLE NO SAMPLEU1-U2 root of Var Deg of Freedom 2.5 ND 2.5 ND 0.001 ND U1-U2 root of Var Deg of Freedom

MAYJUNJULAUGSEPOCTNOVDEC

19991999199919991999199919991999

1003.951004.031003.461003.991003.751001.611002.281002.04


0.069

0.3231.645

6.28872 29.394

1 '

-1.645NO SIGNIFICANT DIFFERENCE EXISTS0

92 - 99 Avg86 - 91 Avg

10031003

92 - 99 VaO.443686 - 91 VaO.4261


NONO

Pass OPass O

NONO

SAMPLESAMPLE

2.5 NDSAMPLESAMPLE

2.5 NDSAMPLESAMPLE

NONO

NONO

NONO

SAMPLESAMPLE

2.5 NDSAMPLESAMPLE

2.5 NDSAMPLESAMPLE

NO SAMPLENO SAMPLE





Calculated T | -2Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Higher


PassPass

ND

0.000 0.01211 13.565

Calculated T | 0.56 |Reference T 1.645 -1.645NO SIGNIFICANT DIFFERENCE EXISTS0

92 - 99 Avg86 - 91 Avg

0.0010.002

92 - 99 VaflE-0786-91 VaQE-06


PassFail

# of Samples 32# of Samples46


Calculated T 2.033 |Reference T 1.645"~-1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

NATURAL LOG TRANSFORMATION

MONTHJAN 1986FEB 1986MAR 1986APR 1986MAY 1986JUN 1986JUL 1986AUG 1986SEP 1986OCT 1986NOV 1986DEC 1986JAN 1987FEB 1987MAR 1987APR 1987MAY 1987JUN 1987JUL 1987AUG 1987SEP 1987OCT 1987NOV 1987DEC 1987JAN 1988FEB 1988MAR 1988APR 1988MAY 1988JUN 1988JUL 1988AUG 1988SEP 1988OCT 1988NOV 1988DEC 1988

WATER LEVEL(ft.)

6.9116.910322

6.91005266.91171746.91176726.91170756.911568

6.91139866.91081066.911817

6.91096016.91154816.90939396.90994296.91021236.91161786.91146846.91113956.91049156.91171746.91168756.91062126.91052146.91122926.91063116.91028216.91061126.91066116.91169756.91092036.91080066.9104417

6.911016.91061126.91023226.9114186

ONA(ppb)

1.1.2TCA(ppb)

ARSENIC(ppm)

-5.115996-4.828314-7.600902-6.907755-6.214608-5.809143-6.214608-5.809143-7.600902-7.600902-5.298317-4.828314-5.809143-7.600902-6.907755-5.809143-6.907755-6.214608-7.600902-6.907755-7.600902-7.600902-6.907755-7.600902-7.600902-6.907755-6.907755-6.214608-6.214608-6.214608-6.214608-6.907755-7.600902-6.907755


JAN 1989FEB 1989MAR 1989APR 1989MAY 1989JUN 1989JUL 1989AUG 1989SEP 1989OCT 1989NOV 1989DEC 1989JAN 1990FEB 1990MAR 1990APR 1990MAY 1990JUN 1990JUL 1990AUG 1990SEP 1990OCT 1990NOV 1990DEC 1990JAN 1991FEB 1991MAR 1991APR 1991MAY 1991JUN 1991JUL 1991AUG 1991SEP 1991OCT 1991NOV 1991DEC 1991JAN 1992FEB 1992MAR 1992APR 1992MAY -1992JUN 1992JUL 1992AUG 1992SEP 1992OCT 1992NOV 1992DEC 1992JAN 1993FEB 1993MAR 1993APR 1993MAY 1993JUN 1993JUL 1993AUG 1993SEP 1993OCT 1993NOV 1993DEC 1993

6.91049156.91054146.90998286.91016246.91101996.91086056.91078076.91039186.91105986.9104117

6.9106716.91022226.90964356.91002276.9097233

6.910996.91154816.9115481

6.9115686.91190676.91166766.91146846.91054146.9101524

6.9099036.91056136.91080066.91211586.91180716.91171746.91146846.91077076.91041176.91060126.91158796.91176726.91146846.91174736.91175736.9116975

6.9115786.91028216.91051156.91168756.91169756.91045166.9113289

6.9115786.91056136.91059136.9104915

6.9120666.911817

6.91174736.91178716.91191666.91169756.91073086.91046166.910302

86-91Avg 6.911 86 - 91 VartE-07 # of Samples 7292Avg 6911 92 Var 3E-07 # of Samples 1286-91Avg 6.911 86 - 91 VartE-07 # of Samples 72

U 1 -U2 root of Var Deg of Freedom-0.00 0.00579 29.394

Calculated T | -2.03 | Var. Test 1 PassReference T 1.645-1.645 Var. Test 2 PassSignificant Difference1992 - 1999 Results Significantly Higher

93Avg 6.911 93 Var 5E-07 # of Samples 1286-91Avg 6.911 86 - 91 VartE-07 # of Samples 72


Calculated T [ '-1.48 | Var. Test 1 PassReference T 1".645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

-7.600902

-6.907755

-5809143

-6.214608

-6214608

-6.907755

-7.600902

-7.600902

-6.907755

-6.907755

-7.600902

-7.600902

86-91Avg -6.71-6.214608 92 Avg -6.81

86-91Avg -6.71

86 - 91 VaO.6732 # of Samples4692 Var 0.8691 #ofSamples486 - 91 VaO.6732 # of Samples46

-5.809143 U1-U2 root of Var Deg of Freedom- 0.092 5.73602 13:565

-7.600902 Calculated T [021Reference T 1 .645NO SIGNIFICANT C

-7.600902 0

-7.600902 93 Avg -6.9186 - 91 Avg -6.71

8 Var. Test 1 Pass-1.645 Var. Test 2 Pass

IFFERENCE EXISTS

93 Var 0.6406 # of Samples486 - 91 VaO.6732 # of Samples46

-6.214608 U1-U2 root of Var Deg of Freedom0.193 5.67596 13.565

-7.600902 Calculated T JX46Reference T 1 .645NO SIGNIFICANT C

-6.214608 0

2 Var. Test 1 Pass-1.645 Var. Test 2 Pass

JIFFERENCE EXISTS

'ersii com

JAN 1994FEE 1994MAR 1994APR 1994MAY 1994JUN 1994JUL 1994AUG 1994SEP 1994OCT 1994NOV 1994DEC 1994JAN 1995FEB 1995MAR 1995APR 1995MAY 1995JUN 1995JUL 1995AUG 1995SEP 1995OCT 1995NOV 1995DEC 1995JAN 1996FEB 1996MAR 1996APR 1996MAY 1996JUN 1996JUL 1996AUG 1996SEP 1996OCT 1996NOV 1996DEC 1996JAN 1997FEB 1997MAR 1997APR 1997MAY 1997JUN 1997JUL 1997AUG 1997SEP 1997OCT 1997NOV 1997DEC 1997JAN 1998FEB 1998MAR 1998APR 1998MAY 1998JUN 1998JUL 1998AUG 1998SEP 1998OCT 1998NOV 1998DEC 1998

6.91013256.90966356.91006266.91137876.91115956.911817

6.91193656.91166766.91094026.91082066.91042176.91065116.91055146.91024226.91164776.91191666.91192666.91174736.91175736.910671

6.91085056.91092036.910671

6.91048166.91022226.91026216.91042176.91092036.91173736.91189676.91125916.91125916.91110966.91066116.911578

6.91194656.91175736.91046166.9110797 .6.91167766.91183696.911289

6.91109976.91125916.91101996.91168756.91077076.91022226.91045166.90995296.9117971

. 6.91201626.91174736.91134886.91159796.91126916.91167766.91105986.91106986.9107408

94 Avg 6911 94 Var 5t 07 » ol Samples 1286 -91 Avg 6.911 86 91 VartE 07 »o(Samples72

U1 U2 toot of Var Deg of Freedom0 0006 29394

Calculated T | 0 \ Var. Test 1 PassReference T 1.645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

95 Avg 6.911 95 Var 4E-07 # of Samples 1286 -91 Avg 6.911 86-91VartE-07 # of Samples 72


Calculated! f"-T"""| Var. Test 1 PassReference T 1~64V -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

96 Avg 6.911 96 Var 4E-07 # of Samples 1286 - 91 Avg 6.91 1 86-91 VartE-07 # of Samples 72


Calculated T |"~1 | Var. Test 1 PassReference T 1.645-1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

97 Avg 6.911 97 Var 3E-07 # of Samples 1286 -91 Avg 6.911 86-91VartE-07 # of Samples 72


Calculated! | "^1.54 "| Var. !est 1 PassReference! l"645 ""-1.645 Var. !est2 PassNO SIGNIFICAN! DIFFERENCE EXISTS0

98 Avg 6.911 98 Var 4E-07 # of Samples 1286-91 Avg 6.911 86 - 91 VartE-07 #ofSamples72


Calculated ! PT.51~| Var. !est 1 PassReference! 1.645" -1.645 Var. !est 2 PassNO SIGNIFICAN! DIFFERENCE EXIS!S0

-7.600902

-7.600902

-7.600902

-7.600902

-7.600902

-6.907755

-6.907755

-6.214608

-7.600902

-7.600902

-7.600902

-7.600902

-6.907755

-7.600902

-7.600902

-7.600902

-6.907755

-6.907755

-6.907755

-5.298317

94Avg -7.6 94 Var 0 #ofSamples486 - 91 Avg -6.71 86 - 91 VaO.6732 # of Samp1es46


Calculated! | 2.185JReference! 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


95 Avg -6.91 95 Var 0.3203 #ofSamples486 - 91 Avg -6.71 86 - 91 VaO.6732 # of Samples46


Calculated T |a46jT| Var. Test 1 PassReference T 1~645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

96 Avg -7.6 96 Var 0 #ofSamples486 - 91 Avg -6.71 86 - 91 VaO.6732 # of Samples46


Calculated TReference! V.645 -1.645Significant Difference1992 -1999 Results Significantly Lower


97 Avg -7.43 97 Var 0.1201 #ofSamples486-91 Avg -6.71 86 - 91 VaO.6732 # of Samples46


Calculated T |!747_|Reference T i.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


98 Avg -6.51 98 Var 0.6476 #ofSamples486 - 91 Avg -6.71 86 - 91 VaO.6732 # of Samples46


Calculated T ijTiTI Var. Test 1 PassReference T 1.645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

DOS) diversinn wall mmnarison

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC

199919991999199919991999199919991999199919991999

6.91017246.91041176.91028216.9120162691169756.91177726.91120936.91173736.91149836.909364

6.91003276.9097932

99 Avg86 - 91 Avg

6.9116.911

99 Var 8E-0786 - 91 VariE-07


ROOT TRANSFORMATION

MONTHJAN 1986FEB 1986MAR 1986APR 1986MAY 1986JUN 1986JUL 1986AUG 1986SEP 1986OCT 1986NOV 1986DEC 1986JAN 1987FEB 1987MAR 1987APR 1987MAY 1987JUN 1987JUL 1987AUG 1987SEP 1987OCT 1987NOV 1987DEC 1987JAN 1988FEB 1988MAR 1988APR 1988MAY 1988JUN 1988JUL 1988AUG 1988SEP 1988OCT 1988

WATER LEVEL(ft.)

31.67412231.66338631.65912231.68548631.68627531.68532831.68311931.68043631.67112231.68706431.67349

31.68280331.64869731.65738531.66164931.68390831.68154

31.67633231.66607

31.68548631.68501231.66812331.66654431.67775231.66828131.66275431.66796531.668754

31.6851731.67285931.67096531.66528131.67428

31.667965

U1-U2 root of Var Deg of Freedom0.000 000627 29.394

Calculated T 0.469 \Reference T 1.645 -1.645NO SIGNIFICANT DIFFERENCE EXISTS0


PassPass

92-99 Avg 6.91186-91 Avg 6.911

92 - 99 VartE-0786 - 91 VariE-07



Calculated T | -1.96 |Reference T 1645 -1.645Significant Difference1992 -1999 Results Significantly Higher


PassPass

-6.907755

-6907755

-6.214608

-6.907755

99 Avg -6.7386-91 Avg -6.71

99 Var 0.1201 #ofSamples486-91 VaO.6732 # of Samples46

ARSENIC(ppm)

0.07745970.08944270.02236070.03162280.04472140.05477230.04472140.05477230.02236070.02236070.07071070.08944270.05477230.02236070.03162280.05477230.03162280.04472140.02236070.03162280.02236070.02236070.03162280.02236070.02236070.03162280.03162280.04472.140.04472140.04472140.04472140.03162280.02236070.0316228


Calculated T | 0.049 |Reference T 1.645 '-1.645 Var. Test 1 PassNO SIGNIFICANT DIFFERENCE EXISTS Var. Test 2 Fail0

92-99 Avg -7.06 92 - 99 VaO.4236 #ofSamples3286 - 91 Avg -6.71 86 - 91 VaO.6732 # of Samples46




PassPass

NOV 1988DEC 1988JAN 1989FEB 1989MAR 1989APR 1989MAY 1989JUN 1989JUL 1989AUG 1989SEP 1989OCT 1989NOV 1989DEC 1989JAN 1990FEB 1990MAR 1990APR 1990MAY 1990JUN 1990JUL 1990AUG 1990SEP 1990OCT 1990NOV 1990DEC 1990JAN 1991FEB 1991MAR 1991APR 1991MAY 1991JUN 1991JUL 1991AUG 1991SEP 1991OCT 1991NOV 1991DEC 1991JAN 1992FEB 1992MAR 1992APR 1992MAY 1992JUN 1992JUL 1992AUG 1992SEP 1992OCT 1992NOV 1992DEC 1992JAN 1993 .FEB 1993MAR 1993APR 1993MAY 1993JUN 1993JUL 1993AUG 1993SEP 1993OCT 1993

31.66196531.680751

31.6660731.66686

31.65801631.66085931 .67443831.67191231.67064931.66449131.67506931.66480731.66891231.66180731.65264631.65864831.65391

31.67396431.68280331.68280331.68311931.68848431.68469731.6815431.66686

31.66070131.65675331.66717531.67096531.69179731.68690631.68548631:68154

31.67049131.66480731.66780731.68343431.68627531.68154

31.68595931.68611731.68517

31.68327631.66275431.66638631.68501231.68517

31.66543931.67933131.68327631.66717531.66764931.66607

31.69100831 .68706431.68595931:68659

31.68864131.68517

31 .669859

86-91 Avg 31.6792Avg 31.6886-91 Avg 31.67

86 - 91 VaO.000192 Var 8E-0586-91 VaO.0001

# of Samples 72# of Samples 12# of Samples 72


Calculated T [ -2.08Reference T 1.645 -1.645Significant Difference1992 -1999 Results Significantly Higher


PassPass

93 Avg 31.68 93 Var 0.0001 #ofSamples1286 - 91 Avg 31.67 86 - 91 VaO.0001 # of Samples 72


Calculated T ( -1.37 |Reference T 1.645-1.645NO SIGNIFICANT DIFFERENCE EXISTS0


PassPass

0.0223607

0.0316228

0.0547723

0.0447214

0.0447214 :

0.0316228'

0.0223607

0.0223607

0.0316228

0.0316228

0.0223607

0.0223607

0.0447214

0.0547723

0.0223607

0.0223607

0.0223607

0.0447214

0.0223607

0.0447214

86-91 Avg 0.038 86 - 91 VaO.0003 #of Samples4692 Avg 0.036 92 Var 0.0003 #ofSamples486-91 Avg 0.038 86 - 91 VaO.0003 #ofSamples46


Calculated T | 0.212"| Var. Test 1 PassReference T 1.645 " -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

93 Avg 0.034 93 Var 0.0002 #ofSamples486 - 91 Avg 0.038 86 - 91 VaO.0003 # of Samples46



| 0.5081.645 -1.645


PassPass



NOV 1993DEC 1993JAN 1994FEB 1994MAR 1994APR 1994MAY 1994JUN 1994JUL 1994AUG 1994SEP 1994OCT 1994NOV 1994DEC 1994JAN 1995FEB 1995MAR 1995APR 1995MAY 1995JUN 1995JUL 1995AUG 1995SEP 1995OCT 1995NOV 1995DEC 1995JAN 1996FEB 1996MAR 1996APR 1996MAY 1996JUN 1996JUL 1996AUG 1996SEP 1996OCT 1996NOV 1996DEC 1996JAN 1997FEB 1997MAR- 1997APR 1997MAY 1997JUN 1997JUL 1997AUG 1997SEP 1997OCT 1997NOV 1997DEC 1997JAN 1998FEB 1998MAR 1998APR 1998MAY 1998JUN 1998JUL 1998AUG 1998SEP 1998OCT 1998

31.66559631.66307

31.66038531.652962

31.6592831.68012

31.67664831.68706431.68895731.68469731.673175

31.6712831.66496531.66859631.66701831.66212231.68438131.68864131.68879931.68595931.68611731.66891231.67175431.67285931.66891231.66591231.66180731.66243831.66496531.67285931.68580131.68832631.67822631.67822631.67585831.66875431.68327631.68911531.68611731.66559631.67538531.68485431.68737931.678699

31.675731.67822631.67443831.68501231.67049131.66180731.66543931.65754331.68674831.69021931.68595931.67964631.68359231.67838431.68485431.675069

94Avg 31.67 94 Var 0.000186-91 Avg 31 .67 86 - 91 VaO.0001

# of Samples 12#ofSamples72

U1-U2 root of Var Deg of Freedom0.000 0.09499 29394


00931.645 -1.645



95 Avg86 - 91 Avg

31.6831.67

U1-U2

95 Var 1E-0486 - 91 VaO.0001


root of Var Deg of Freedom-0.00 0.09295 29.394


-1.04 |1.645 -1.645

Var Test 1 PassVar. Test 2 Pass


96 Avg86-91 Avg

31.6831.67

U1-U2

96 Var 1E-0486 - 91 VaO.0001


root of Var Deg of Freedom-0.00 0.09269 29.394


-1.021.645 -1.645



97 Avg86 - 91 Avg


31.6831.67

U1-U2-0.00

-1.421 .645

97 Var 7E-0586 - 91 VaO.0001



-1.645Var. Test 1 PassVar. Test 2 Pass


98 Avg86 - 91 Avg


31.6831.67

U1-U2-0.01

-1.62"1.645 "

98 Var 9E-0586 - 91 VaO.0001



-1.645Var. Test 1 PassVar. Test 2 Pass


00223607

0.0223607

00223607

0.0223607

0 0223607

0.0316228

: 00316228

0.0447214

00223607

00223607

! 0.0223607

00223607

0.0316228

0.0223607

] 0.0223607

0.0223607

0.0316228

0.0316228

| 0.0316228

0.0707107

94 Avg 0 022 94 Var 0 # of Samples486 - 91 Avg 0.038 86 - 91 VaO.0003 # of Samples46


Calculated T 1.793Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


95 Avg 0.033 95 Var 8E-05 # of Samples486 - 91 Avg 0.038 86 - 91 VaO.0003 # of Samples46


Calculated T 0.615Reference T 1.645 -1.645NO SIGNIFICANT DIFFERENCE EXISTS0

Var Test 1Var Test 2

PassPass

96 Avg 0.022 96 Var 0 # of Samples486-91 Avg 0.038 86 - 91 VaO.0003 #ofSamples46

U1-U2 root of Var Deg of Freedom0.016 .0.11803 13.565

Calculated T 1.793Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower

Var. Test 1 PassVar Test 2 Fail

97 Avg 0.025 97 Var 2E-05 #ofSamples486 - 91 Avg 0.038 86 - 91 VaO.0003 # of Samples46


Calculated T 1.525 Var Test 1 PassReference T 1.645-1.645 Var. Test 2 FailNO SIGNIFICANT DIFFERENCE EXISTS0

98 Avg 0.041 98 Var 0.0004 #ofSamples486 - 91 Avg 0.038 86 - 91 VaO.0003 # of Samples46


Calculated T | -0.38 Var. Test 1 PassReference T 1.645 -1.645 Var. Test 2 PassNO SIGNIFICANT DIFFERENCE EXISTS0

rersn com

NOV 1998DEC 1998JAN 1999FEB 1999MAR 1999APR 1999MAY 1999JUN 1999JUL 1999AUG 1999SEP 1999OCT 1999NOV 1999DEC 1999

31.67522731.67001731.66101731.66480731.66275431.69021931.68517

31.68643231.67743731.68580131.68201431.64822331.65880631.655015

99Avg 31.67 99 Var 0.0002 # of Samples 1286 - 91 Avg 31.67 86 - 91 VaO.0001 # of Samples 72


Calculated T | 6.326Reference! 1.645 -1.645NO SIGNIFICANT DIFFERENCE EXISTS0


PassPass

0.0316228

0.0316228

0.0447214

0.0316228

99 Avg 0.035 99 Var 4E-05 #ofSamples486-91 Avg 0.038 86 - 91 VaO.0003 #ofSamples46


Calculated T 0.355JReference T V645 -1.645 Var. Test 1NO SIGNIFICANT DIFFERENCE EXISTS Var. Test 20

PassFail

92 - 99 Avg86 - 91 Avg

31.68 92 - 99 VaO.000131.67 86 - 91 VaO.0001


92 - 99 Avg86-91 Avg

0.031 92 - 99 VaO.00010.038 86-91 VaO.0003




Calculated T |_-^.98 ]Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Higher


PassPass

Calculated T | 1.99Reference T 1.645 -1.645Significant Difference1992 - 1999 Results Significantly Lower


PassPass

post diversion wall comoarison

Table 4 Values of t,"

V

12345

6789

10

1112131415

1617181920

2122232425

26272829inf.

a=0.10

3.0781.8861.6381.5331.476

1.4401.4151.3971.3831.372

1.3631.3561.3501.3451.341

1.3371.3331.3301.3281.325

.323

.321

.319

.318

.316

.315

.3141.3131.3111.282

a = 0.05

6.314.2.9202.3532.1322.015

1.9431.8951.8601.8331.812

1.7961.7821.7711.7611.753

1.7461.7401.7341.7291.725

1.7211.7171.7141.7111.708

1.7061.7031.7011.6991.645 !

a = 0.025

12.7064.3033.1822.7762.571

2.4472.3652.3062.2622.228

2.2012.1792.1602.145)

^2.131

2.1202.110

.2.1012.0932.086

2.0802.0742.0692.0642.060

2.0562.0522.0482.0451.960

a = 0.01

31.8216.9654.5413.7473.365

3.1432.9982.8962.8212.764

2.7182.6812.6502.624s

2.602

2.5832.5672.5522.5392.528

2.518'2.5082.5002.4922.485

2.4792.4732.4672.4622.326

a = 0.005

63.6579.9255.8414.6044.032

3.707. 3.499

3.3553.2503.169

3.1063.0553.0122.9772.947

2.9212.8982.8782.8612.845

2.8312.8192.8072.7972.787

2.7792.7712.7632.7562.576

V

12345

6789

10

1112131415

1617181920

2122232425

26272829inf.

* Abridged by permission of Macmillan Publishing Co., Inc., from StatisticalMethods for Research Workers, 14th ed., by R. A. Fisher. Copyright © 1970 University ofAdelaide.

587 Statistical Tables

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