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TRANSCRIPT
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STATISTICAL SUMMARY OF WATER-QUALITY DATA
COLLECTED FROM SELECTED WELLS AND SPRINGS
IN THE EDWARDS AQUIFER NEAR SAN ANTONIO, TEXAS
By Frank C. Wells
U.S. GEOLOGICAL SURVEY Open-file Report 85-182
Prepared in cooperation with the
EDWARDS UNDERGROUND WATER DISTRICT
Austin, Texas
1985
-
UNITED STATES DEPARTMENT OF THE INTERIOR
DONALD PAUL MODEL, Secretary
GEOLOGICAL SURVEY
Dallas L. Peck, Director
For additional write to:
information For sale by:
District Chief U.S. Geological Survey 649 Federal Building 300 E. Eighth Street Austin, TX 78701
Open-File Services Section Western Distribution Branch U.S. Geological Survey Box 25425, Federal Center Denver, CO 80225
II
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CONTENTS
Abstract Introduction
Purpose and scope - Wel 1-numbering system- - - - ---
Statistical procedures for summarizing water-quality data- Selected references Supplemental information
Page
122257
ILLUSTRATIONS
Figure 1. Map showing location of study area and data-collection sites
TABLES
Table 1. U.S. Geological Survey water-quality laboratory detection limits for selected minor-element and nutrient data, 1973-82 -
2-6. Statistical summary of selected water-quality data inthe Edwards aquifer:
2. Rexar County, Texas -- Comal County, Texas-- Hays County, Texas -- Medina County, Texas-
3.4.5.6.
_______ ___ 10. 100_ 120. . 135
Uvalde County, Texas 148
CONVERSION FACTORS
Factors for converting inch-pound units to metric equivalents are given in the following table:
From Multiply by To obtain
micromho per centimeter at 25° Celsius (ymhos/cm)
1.000 microsiemens per centimeter at 25° Celsius
III
-
STATISTICAL SUMMARY OF WATER-QUALITY DATA
COLLECTED FROM SELECTED WELLS AND SPRINGS IN
THE EDWARDS AQUIFER NEAR SAN ANTONIO, TEXAS
By
Frank C. Wells
ABSTRACT
Statistical summaries of available water-quality data collected from 90 wells and 3 springs in the Edwards aquifer near San Antonio, Texas, are pre- sented. The statistical summaries provide information on the range in values for each water-quality constituent as well as the mean value, the standard deviation about the mean; and for those constituents with five or more analy- ses, the percentage of observations in which values were equal to or less than the specified values are presented.
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INTRODUCTION
Geologic and hydrologic investigations of the Edwards aquifer in the San Antonio area, Texas, have been conducted for many years by the U.S. Geological Survey in cooperation with the Texas Department of Water Resources, the Edwards Underground Water District, and the San Antonio City Water Board. As part of these investigations, a considerable amount of data have been collected on the chemical quality of water in the aquifer.
In 1968, the Geological Survey, in cooperation with the Texas Department of Water Resources and the Edwards Underground Water District, began a contin- uing program to systematically collect data for detecting pollution and for determining changes in the quality of water in the Edwards aquifer. Reports of these investigations are listed in "Selected References."
Purpose and Scope
Although water-quality data have been collected for many years from numer- ous wells throughout the Edwards aquifer, only limited efforts have been made to summarize and review these data. The purpose of this report is to provide statistical summaries of available water-quality data collected from 90 wells and 3 springs in the Edwards aquifer near San Antonio, Texas. Data compiled in this report will be used in additional interpretative studies to define the variation in water quality in the study area. The study area of this report includes all or parts of Bexar, Comal, Hays, Medina, and Uvalde Counties in south-central Texas (fig. 1).
Well-Numbering System
The well-number ing system used in this report was developed by the Texas Department of Water Resources for use throughout the State. Under this system, each 1-degree quadrangle is given a number consisting of two digits. These are the first two digits in the well number. Each 1-degree quadrangle is divided into 7-1/2-minute quadrangles which are given two-digit numbers from 01 to 64. These are the third and fourth digits of the well number. Each 7-1/ki-minute quadrangle is divided into 2-1/2-minute quadrangles which are given a single- digit number from 1 to 9. This is the fifth digit of the well number. Finally, each well within a 2-1/2-minute quadrangle is given a two-digit number in the order in which it was inventoried, starting with 01. These are the last two digits of the well number.
Only the last three digits of the well number are shown at each location in figure 1; the second pair of digits (01-64) are shown in the northwest corner of each 7-1/2-minute quadrangle.
In addition to the seven-digit well number, a two-letter prefix is used to identify the county. The prefix for counties where wells were sampled are as follows: AY, Bexar; DX, Comal; LR, Hays; TD, Medina; and YP, Uvalde. An example well number is AY-68-36-102.
-2-
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STATISTICAL PROCEDURES FOR SUMMARIZING WATER-QUALITY DATA
Statistical procedures in this study were performed using the Statistical Analysis System (SAS)!/ developed by the SAS Institute of Cary, North Carolina, (SAS Institute, Inc., 1982). The SAS computer system has been interfaced with the Geological Survey's National Water Data Storage and Retrieval System (WATSTORE). The SAS computer system provides data-management functions such as sorting, merging, copying, and condensing sets of data.
The principal SAS procedure utilized in the preparation of this report is the UMIVARIATE procedure. The UNIVARIATE procedure produces simple descriptive statistics of numeric variables and provides information on the distribution of values for each variable. Statistical information provided by the UNIVARIATE procedure includes sample size or the number of observations on which statisti- cal calculations were based, the maximum value, the minimum value, the mean value, the standard deviation about the mean, and the 95th, 75th, 50th (median), ?5th, and 5th percentile values.
The statistical summaries (tables 2-6, supplemental information) provide information on the range in values for each constituent as well as the mean value and the standard deviation about, the mean. For those constituents with five or more observations, the statistical summaries also show the percentage of observations in which values were less than or equal to specified values, thus providing information about the distribution of the values in addition to the range of values. For example, at well AY-68-21-804, the maximum and minimum observed specific conductances are 592 and 475 umhos/cm respectively, but for 50 percent of the observations the specific conductance was less than or equal to 532 nmhos/cm. Likewise, the table shows that 50 percent of the specific- conductance values ranged between 568 and 525 urchos/cm.
Analytical methodologies generally change and improve with time, and two or more methods may be available for analysis of an individual constituent at any given time with each method having different detection limits. Conse- quently, detection limits for an individual constituent may vary depending upon the methodology used at the time of analysis. Geological Survey labora- tory detection limits for selected minor elements and nutrients for 1973-82 are listed in table 1 (supplenental information).
Some of the nutrient data and much of the minor element data are reported by the laboratory and stored in the Geological Survey's WATSTORE files as "less than" (
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performed. Consequently, zero values in the statistical tables for constitu- ents listed in table 1 do not indicate that a constituent was not present, but that if the constituent was present, the concentration was less than the lower limit of detection, or if detection limits had not been established, the con- stituent could not be detected using the prescribed methodology at the time of analysis.
Values for some of the bacteriological data stored in the WATSTORE files may be reported as "less than" or that the reported value was determined on a "non-ideal colony count." Values reported as "less than" indicate that no indicator bacteria were found on the largest sample analyzed. For the purposes of statistical analysis of data included in this report, values of "less than" were converted to zero. Consequently, zero values for bacteriological data do not mean that no bacteria were present, but that no indicator bacteria were detected in the largest sample analyzed.
Bacteriological data reported as being determined on a "non-ideal colony count" indicate that the number of indicator bacteria on samples analyzed did not fall within the ranges of 20-60 colonies per 100 milliliters (cols./lOO Ml) for fecal coliform bacteria, 20-80 cols./I00 Ml for total coliform bacteria, or 20-100 cols./lOO Ml for fecal streptococci bacteria. For the purposes of sta- tistical analysis of data for this report, bacteriological data reported as being determined on a "non-ideal colony count" were left unchanged. Although these number of indicator bacteria were outside the ideal range of colonies per 100 milliliters of water, the data are reasonable estimates of the bacterial densities at the time of analysis.
-6-
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SELECTED REFERENCES
Gaydos, M. W., 1980, Summary of water-quality data for selected streams in Colorado: U.S. Geological Survey Water-Resources Investigations/Open- File Report 80-682, 152 p.
Mac!ay, R. W., Rettman, P. L., and Small, T. A., 1980, Hydrochemical data for the Edwards aquifer in the San Antonio area, Texas: Texas Department of Water Resources report LP-131, 38 p.
Maclay, R. W., Small, T. A., and Rettman, P. L., 1980, Water-level, recharge, discharge, specific-capacity, well-yield, and aquifer-test data for the Edwards aquifer in the San Antonio area, Texas: Texas Department of Water Resources report LP-133, 83 p.
, 1981, Application and analysis of borehole data for the Edwards aquiferin the San Antonio area, Texas: Texas Department of Water Resources reportLP-139, 88 p.
Rawson, Jack, 1974, The quality of surface waters in Texas: U.S. GeologicalSurvey Water-Resources Investigations Report 7-74, 73 p.
Reeves, R. P., 1976, Chemical and bacteriological quality of water at selectedsites in the San Antonio area, Texas, August 1968-January 1975: EdwardsUnderground Water District report, 122 p.
, 1978, Chemical and bacteriological quality of water at selected sitesin the San Antonio area, Texas, February 1975-September 1977: EdwardsUnderground Water District report, 33 p.
Reeves, R. D., and Blakey, J. F., 1970, Geology and water quality at selectedlocations in the San Antonio area, Texas, progress report, 1979: EdwardsUnderground Water District report, 17 p.
Reeves, R. D., Maclay, R. W., Grimm, K. C., and Davis, M. F., 1980, Records ofground-water recharge, discharge, water levels, and chemical quality ofwater for the Edwards aquifer in the San Antonio area, Texas, 1934-78:Edwards Underground Water District Bulletin 38, 53 p.
, 1981, Records of ground-water recharge, discharge, water levels, and chemical quality of water for the Edwards aquifer in the San Antonio area, Texas, 1934-79: Edwards Underground Water District Bulletin 39, 133 p.
Reeves, R. D., Rawson, Jack, and Blakey, J. F., 1972, Chemical and bacterio- logical quality of water at selected sites in the San Antonio area, Texas, August 1968-April 1972: Edwards Underground Water District report, 63 p.
SAS Institute, Inc., 1982, SAS user's guide: Basics, 1982 edition: Cary, North Carolina, SAS Institute, Inc., 923 p.
-7-
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SUPPLEMENTAL INFORMATION
-8-
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Table 1. U.S. Geological Survey water-quality laboratory detection limits for selected minor-element and nutrient data, 1973-82
[iig/L, microgram per liter; ND, not detected; mg/L, milligram per liter]
Minor elements
Constituent
Aluminum, dissolved (ng/L)Arsenic, dissolved (ng/L)Barium, dissolved (ng/L)Boron, dissolved (ng/L)Cadmium, dissolved (ng/L)Chromium, dissolved (ng/L)Cobalt, dissolved (ng/L)Copper, dissolved (ng/L)Iron, dissolved (ng/L)Lead, dissolved (ug/L)Lithium, dissolved (ng/L)Manganese, dissolved (ng/L)Mercury, dissolved (ng/L)Nickel, dissolved (ug/L)Selenium, dissolved (ng/L)Silver, dissolved (ng/L)Strontium, dissolved (ng/L)Vanadium, dissolved (ng/L)Zinc, dissolved (ng/L)
1973-77
1001
10020
ND or 2ND
100ND or 2
10ND or 2
1010
.05ND or 2
1ND
10
ND or 20
Time period1978-79
1001
10020
ND or 2ND or 20
100ND or 2
10ND or 2
1010
.01ND
1ND or 2
10 10
1980-82
1001
100201
101 or 501 or 10
101
1010
.01111
.110
Nutrients
Constituent
Nitrogen, ammonia, total (mg/L)Nitrogen, nitrite, total (mg/L)Nitrogen, nitrite + nitrate (mg/L)Nitrogen, ammonia + organic (mg/L)Phosphorus, total (mg/L)
Time period1973-82
0.01.01.01 or 0.1.1.01
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TABLE
2.--STATISTICAL SUMMARY OF
SELECTED WATER-QUALITY DATA IN
TH
E EDWARDS AQUIFER, BEXAR COUNTY, TEXAS
STATION NUMBER:
293749098263601
WELL NUMBER:
AY-68-21-804
LATITUDE: 293749
LONGITUDE:
0982636
SUMMARY OF SELECTED WATER-QUALITY DATA COLLECTED AT PERIODIC INTERVALS
[DEG
C,
de
gree
Celsius; UMHOS, mi
crom
ho pe
r ce
ntim
eter
at 25
° Ce
lsiu
s; MG
/L,
milligram
per
lite
r;
COLS
./10
0 ML,
colonies pe
r 100
mill
ilit
ers;
TO
NS PER
AC-FT, tons per
acre-foot; UG
/L,
microgram
per
liter]
DESCRIPTIVE STATISTICS
PERCENT OF SAMPLES IN WHICH VALUES
WERE LE
SS THAN OR EQUAL TO
THOSE SHOWN
SAMPLE
WATER QUALITY CONSTITUENT
SIZE
TEMPERATURE (DEG C)
SPECIFIC CONDUCTANCE (UMHOS)
OXYGEN DEMAND, BIOCHEMICAL,
5 DA
Y (M
G/L)
OXYGEN DEMAND, CHEMICALUOW LEVEL) (M
G/L)
OXYGEN DEMAND, CHE
M IC
AL (HI
GH
LEVEL) (MG/L)
PH (U
NITS
)CARBON DIOXIDE, DISSOLVED (M
G/L
AS C0
2)ALKALINITY FIELD (MG/L
AS CA
C03)
BICARBONATE FET-FLD (M
G/L
AS HC03)
CARBONATE FET-FLD (MG/L
AS C0
3)SOLIDS, RESIDUE AT
105
DEG.
C, SUS.(MG/L)
OIL
AND
GREASE (M
G/L)
NITROGEN, TOTAL (MG/L
AS N)
NITROGEN, ORGANIC TOTAL (MG/L
AS N)
NITROGEN, AMMONIA TOTAL (M
G/L
AS N)
NITROGEN, NITRITE TOTAL (MG/L
AS N)
NITROGEN,
NITR
ATE
TOTA
L (M
G/L
AS N)
NITROGEN,
N02+N03
TOTA
L (MG/L
AS N)
PHOSPHORUS, TOTAL (M
G/L
AS P)
CARBON, ORGANIC TOTAL (M
G/L
AS C)
CARBON, ORGANIC DISSOLVED (MG/L
AS C)
HARDNESS (MG/L
AS CAC03)
HARDNESS, NONCARBONATE (M
G/L
CAC03)
CALCIUM, DISSOLVED (MG/L
AS CA)
MAGNESIUM, DISSOLVED (M
G/L
AS MG
)SODIUM, DISSOLVED (M
G/L
AS NA
)SODIUM ADSORPTION RATIO
POTASSIUM, DISSOLVED (M
G/L
AS K)
CHLORIDE, DISSOLVED (MG/L
AS CL
)SULFATE, DISSOLVED (M
G/L
AS S0
4)FLUORIDE, DISSOLVED (MG/L
AS F)
SILICA, DISSOLVED (M
G/L
AS SI02}
COLIFORM, TOTAL, IMMED. (
COL
S. /10
0 ML
)COLIFORM, FE
CAL,
0.
7 UM
-MF(
COL
S. /10
0 ML)
STREPTOCOCCI, FE
CAL,
KF
AGAR ( CO
LS. /1
00 ML
)METHYLENE BL
UE ACTIVE SUBSTANCE (MG/L)
SOLI
DS,
SUM
OF CONST ITUENTS
, DIS
S. (M
G/L)
SOLIDS, DISSOLVED (T
ONS
PER
AC-FT)
BROMIDE, DISSOLVED (M
G/L
AS BR
)
14 13 8 55
13 11 13 11 114 3 14 14 14 13 13 14 14 113
12 12 12 12 12 12 12 11 11 12 12 14 14 147 9 9 2
MAXIMUM
24.00
592.00
0.80
19.0
011
0.00
7.20
102.
0027
1.00
330.
000.00
1.00
0.00
7.30
1.40
0. 17
0.04
5.70
5.80
0.03
11.00
3.40
310.
0047.00
120.00
3. 10
3.90
0. 10
1.00
12.0
07.
500.
20
13.0
010
0.00
0.00
3.00
0.10
307.
000.
420.40
MINIMUM
23.
475. 0. 1. 0. 6.
33.
238.
290. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
250. 0.
98. 2. 2. 0. 0. 7. 0. 0. 10. 0. 0. 0. 0.
279. 0. 0.
00 00 20
00 00 70 00 00 00 00 00 00 92 06 00 00 86 86 00 00 00 00 00 00 20 30 10 60 30 00 00 00 00 00 00 00 00 38 10
MEAN
23.46
539.62
0.42
8.20
32. 20
6.96
54.45
261.85
320.
000.
00
3. 37
0.43
0.03
0.01
2.69
2.91
0.01
1.69
283.
3321.92
109.17
2.63
3.33
0. 10
0.68
9.05
3.40
0.09
11.8
313
.21
0.00
0.36
0.03
298.
11
0.40
STANDARD
DEVIATION
95
0.24
31.87
0.22
7.26
46.6
90. 18
21.65
8.84
11.8
30.00
1. 93
0.35
0. 05
0.01
1. 53
1.69
0.01
3.15
14.35
13.9
85.22
0.32
0.47
0.00
0. 11
1.98
2.58
0.05
1.11
28.30
0.00
0.93
0.05
10.0
70.01
24.0
0592.00
0.80
19.00
110.
007.
20102.00
271.00
330.
000.
00
7.30
1.40
0. 17
0.04
5.70
5.80
0.03
11.0
0
310.
0047
.00
120. 00
3. 10
3.90
0. 10
1.00
12.0
07.50
0.20
13.0
010
0.00
0.00
3.00
0.10
307.
000.
42
75
23.5
056
7.50
0.57
14.50
76.0
07.
10
64.00
270.
0033
0.00
0.00
5.05
0.61
0.05
0.02
3. 75
4.53
0.02
1.70
290.
0025
.00
110.
00
2.90
3.80
0. 10
0.70
12.0
04.70
0. 10
13.0
016
.00
0.00
0.00
0.10
305.
000.41
MEDI
AN
50
23. 50
532.00
0.45
9.00
5.00
7.00
51.00
262.00
320,00
0.00
3.05
0.34
0.01
0.00
2.30
2.40
0.01
0.60
285.
0023. 50
110.00
2. 70
3.20
0. 10
0.70
8. 10
4. 10
0. 10
12.0
00.00
0.00
0.00
0.00
302.00
0.41
25
23.5
0525.50
0.20
1.50
2.00
6.80
37.0
026
0.00
320.00
0.00
1.85
0.17
0.00
0.00
1.50
1.50
0.01
0.30
280.
0013.25
110.00
2.30
3.13
0. 10
0.60
7.60
0.50
0. 10
11.0
00.00
0.00
0.00
0.00
291.00
0.39
5
23.00
475.00
0.20
1.00
0.00
6.70
33.00
238.
0029
0.00
0. 00
0.92
0.06
0.00
0.00
0.86
0.86
0.00
0.00
250.00
0.00
98.0
02.
202.30
0. 10
0.60
7.30
0.00
0.00
10.0
00.
000.
000.00
0.00
279.
000.38
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TABLE
2.--STATISTICAL SU
MMAR
Y OF
SE
LECT
ED WATER-QUALITY DATA IN TH
E EDWARDS
AQUI
FER,
BEXAR
COUN
TY,
TEXAS--CONTINUED
STAT
ION
NUMBER:
293749098263601
WELL NU
MBER
: AY-68-21-804
LATITUDE:
2937
49
LONGITUDE:
0982
636
SUMMARY OF
SELECTED WATER-QUALITY DA
TA COLLECTED AT PERIODIC INTERVALS
DESC
RIPT
IVE
STAT
ISTI
CSPERCENT
OF SAMPLES IN WH
ICH
VALU
ES
WERE LESS TH
AN OR EQ
UAL
TO TH
OSE
SHOWN
WATE
R QU
ALIT
Y CONSTITUENT
ARSE
NIC,
DISSOLVED (U
G/L
AS AS)
BARI
UM,
DISSOLVED
(UG/
L AS
BA)
CADMIUM, DISSOLVED
(UG/
L AS
CD)
CHRO
MIUM
, DISSOLVED
(UG/
L AS
CR
)CO
PPER
, DISSOLVED (U
G/L
AS CU)
IRON,
DISSOLVED (UG/
L AS
FE)
LEAD,
DISSOLVED (U
G/L
AS PB)
MANG
ANES
E, DISSOLVED
(UG/
L AS
MN
)NICKEL,
DISSOLVED
(UG/
L AS NI
)SILVER,
DISSOLVED (U
G/L
AS AG
)VA
NADI
UM,
DISSOLVED (U
G/L
AS V)
ZINC
, DISSOLVED (UG/L
AS ZN
)SE
LENI
UM,
DISSOLVED (U
G/L
AS SE )
PERT
HANE
, TOTAL
(UG/L)
NAPHTHALENES', PO
LYCH
LOR.
, TOTAL
(UG/
L)ALDRIN,
TOTAL
(UG/L)
LIND
ANE,
TO
TAL
(UG/
L)CH
LORD
ANE,
TOTAL
(UG/L)
ODD, TOTAL
(UG/
L)DDE, TOTAL
(UG/
L)DO
T, TOTAL
(UG/
L)DIELDRIN,
TOTAL
(UG/L)
ENDOSULFAN,
TOTAL
(UG/
L)EN
DRIN
, TOTAL
(UG/L)
ETHION,
TOTAL
(UG/
L)TO
XAPH
ENE,
TOTAL
(UG/L)
HEPT
ACHL
OR,
TOTAL
(UG/
L)HEPTACHLOR EPOXIDE, TOTAL
(UG/
L)METHOXYCHLOR, TO
TAL
(UG/
L)PCB, TO
TAL
(UG/L)
MALATHION, TOTAL
(UG/
L)PA
RATH
ION,
TO
TAL
(UG/L)
DIAZ
INON
, TOTAL
(UG/
L)ME
THYL
PARATHION, TO
TAL
(UG/L)
2,4-
D, TOTAL
(UG/
L)2,4,5-T, TO
TAL
(UG/L)
MIREX, TOTAL
(UG/
L)SI
LVEX
, TOTAL
(UG/L)
TRIT
HION
, TOTAL
(UG/
L)METHYL TR
ITHI
ON,
TOTA
L (UG/L)
MERCURY, DISSOLVED (UG/L
AS HG)
SAMPLE
SIZE 7 7 7 7 7 7 12 7 2 7 3 7 7 1 3 4 4 4 4 4 4 4 4 4 4 4 4 4 3 4 4 4 4 4 4 4
1 4 4 4 7
MAXI
MUM
1.00
200.
000.00
10.00
3.00
40.0
013.00
20.0
02.00
0.00
2.00
1500
.00
3.00
0.00
0.00
0.00
0.00
0.00
o.od
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
MINIMUM
0.00
0.00
0.00
0.00
0.00
0. 00
0.00
0.00
0.00
0.00
1.40
840.
000.00
0.00
0.00
0. 00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0. 00
0.00
0.00
0.00
0.00
0.00
0. 00
0.00
0. 00
0.00
0.00
0.00
MEAN
0.36
. 0. 1. 0.13. 4. 4. 0.
1137. 0. 0.
57 86 00 43 57 57 67 29 00 14 71 00
STAN
DARD
DE
VIAT
ION
0.53
73.2
30.00
3.78
1.13
16.5
14.
317.52
0.00
244.
251.
11
0.00
95 1.00
200.00
0.00
10.00
3.00
40.00
13.00
20.00
0.00
1500.00
3.00
0.00
75
1.00
30.0
00.00
0.00
1.00
30.0
08.
008.00
0.00
1400.00
1.00
0.00
MEDI
AN
50
1.00
0.00
0.00
0.00
0.00
5.00
4.00
0.00
0.00
1100
.00
0.00
0.00
25
0.00
0.00
0.00
0.00
0.00
0.00
0.50
0.00
0.00
940.00
0.00
0.00
5
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
840.00
0.00
0.00
-
TABL
E 2. STATISTICAL SUMMARY OF
SELECTED WATER-QUALITY DA
TA IN
TH
E EDWARDS
AQUIFER, BEXAR
COUNTY,
TEXAS CONTINUED
STATION NUMBER:
293454098375701
WELL
NUMBER:
AY-68-27-302
LATI
TUDE
: 29
3454
LO
NGIT
UDE:
0983757
WELL
DEPTH:
517.00
SUMMARY OF
SELECTED WATER-QUALITY DA
TA COLLECTED AT PERIODIC IN
TERV
ALS
DESCRIPTIVE ST
ATIS
TICS
PERCENT
OF SAMPLES
IN WHICH
VALU
ES
WERE
LE
SS TH
AN OR EQUAL
TO TH
OSE
SHOWN
SAMPLE
WATER QU
ALIT
Y CONSTITUENT
SIZE
MAXI
MUM
TEMPERATURE (D
EG C)
SPEC
IFIC
CONDUCTANCE (U
MHOS
)PH
(U
NITS
)CA
RBON
DIOXIDE, DISSOLVED
(MG/L
AS C02)
ALKA
LINI
TY FIELD
(MG/
L AS CA
C03)
BICARBONATE FE
T-FL
D (MG/L
AS HC03
)CARBONATE
FET-FLD (MG/
L AS C03)
OIL
AND
GREASE (M
G/L)
NITR
OGEN
, TOTAL
(MG/L
AS N)
NITR
OGEN
, ORGANIC
TOTA
L (MG/L
AS N)
NITR
OGEN
, AM
MONI
A TOTAL
(MG/
L AS N)
NITR
OGEN
, NI
TRIT
E TOTAL
(MG/L
AS N)
NITR
OGEN
, NI
TRAT
E TOTAL
(MG/
L AS N)
NITR
OGEN
, N0
2+N0
3 TOTAL
(MG/L
AS N)
PHOS
PHOR
US,
TOTAL
(MG/
L AS P)
CARBON,
ORGA
NIC
DISSOLVED
(MG/L
AS C)
HARD
NESS
(M
G/L
AS CA
C03)
HARD
NESS
, NONCARBONATE (MG/L
CAC03)
CALCIUM, DISSOLVED
(MG/
L AS
CA)
MAGN
ESIU
M, DISSOLVED
(MG/
L AS MG
)SODIUM,
DISSOLVED (MG/
L AS
NA )
SODI
UM ADSORPTION RATIO
POTA
SSIU
M, DISSOLVED (M
G/L
AS K)
CHLO
RIDE
, DISSOLVED
(MG/
L AS CL
)SULFATE, DISSOLVED (M
G/L
AS S0
4)FL
UORI
DE,
DISSOLVED
(MG/L
AS F)
SILI
CA,
DISSOLVED (M
G/L
AS SI02)
COLI
FORM
, TO
TAL,
IM
MED.
( COL
S . /100
ML)
COLI
FORM
, FECAL, 0.45
UM-M
F ( C
OLS
. /100
ML)
COLI
FORM
, FECAL, 0.
7 UM
-MF(
COL
S . /100
ML)
STREPTOCOCCI,
FECAL, KF
AGAR( CO
LS . /100 ML
)STREPTOCOCCI,
FECAL
(COL
S./1
00 ML
)METHYLENE
BLUE ACTIVE SUBSTANCE (M
G/L)
SOLIDS,
SUM
OF CONSTITUENTS, DISS.(MG
/L)
SOLIDS,
DISSOLVED (TON
S PE
R AC
-FT)
12 12 8 69 7 7 1 7 7 9 7 6 9 9 7 9 9 9 9 8 8 8 109 8 9 127 5 5 7 3 9 6
25.00
515.
007.
9037.00
248.
0030
2.00
0.00
0.00
2.60
0.66
0.14
0.02
1.80
2.00
0.04
1.90
270.
0026.00
87.0
018.00
6. 10
0.20
0.90
18.00
14.00
0.40
15.0
00.00
0.00
0.00
0.00
2.00
0.10
297.00
0.39
MINI
MUM
22.
479. 6. 6.
230.
280. 0. 0. 1. 0. 0. 0. 1. 1. 0. 0.
250. 14.
71.
11. 5. 0. 0. 9. 9. 0. 10. 0. 0. 0. 0. 0. 0.
269. 0.
50 00 90 10 00 00 00 00 70 00 00 00 60 60 00 00 00 00 00 00 50 20 60 10 20 10 00 00 00 .
00 00 00 00 00 37
MEAN
23.33
499.33
7.29
21.0
2238.11
290.
710.00
2.04
0.28
0.03
0.01
1. 72
1.74
0.01
0.60
256.67
20.2
282.33
12.6
75.
890.
200.
7611.51
10.99
0.18
11.33
0.00
0.00
0.00
0.00
0.43
280.22
0.38
STAN
DARD
DE
VIAT
ION
95
0.75
9.59
0.31
9.99
5.49
6.40
0.00
0.31
0.25
0.05
0.01
0.08
0.11
0.02
0.62
7.07
4.60
4.85
2.06
0.20
0.00
0. 11
2.45
1.41
0.12
1.41
0.00
0.00
0.00
0.00
0.79
8.38
0.01
25.00
515.00
7.90
37.0
024
8.00
302.
000.00
2.60
0.66
0. 14
0.02
1.80
2.00
0.04
1.90
270.
0026.0
087.00
18.00
6.10
0.20
0.90
18.00
14.0
00.40
15.0
00.
000.
000.00
0.00
2.00
297.
000.39
75
24.0
0505.50
7.40
26.50
240.00
292.
000.
00
2.20
0.45
0.07
0.02
1.80
1.80
0.03
0.70
260.00
25.00
86.0
012
.50
6.08
0.20
0.80
12.0
011.50
0.28
11.0
00.
000.
000.00
0.00
1.00
285.
000.
38
50
23.0
0501.00
7.30
21.00
239.
0029
0.00
0.00
1.90
0.26
0.00
0.01
1.70
1.70
0.01
0.40
260.
0019.00
82.0
012.00
5.90
0.20
0.80
11.0
011.00
0.10
11.0
00.
000.00
0.00
0.00
0.00
280.
000.
38
MEDIAN
25
23.0
049
3.50
7.03
15.02
234.
0029
0.00
0.00
1.80
0.01
0.00
0.00
1.68
1.70
0.00
0.30
250.
0016.00
81.0
012.00
5.80
0.20
0.65
10.00
9.85
0.10
11.0
00.
000.
000.00
0.00
0.00
274.
000.
38
5
22.50
479.
006.90
6.10
230.00
280.
000.00
1.70
0.00
0.00
0.00
1.60
1.60
0.00
0.00
250.
0014
.00
71.0
011.00
5.50
0.20
0.60
9.10
9.20
0.10
10.0
00.
000.00
0.00
0.00
0.00
269.00
0.37
-
TABL
E 2. STATISTICAL SU
MMAR
Y OF SELECTED WATER-QUALITY DA
TA IN
TH
E EDWARDS AQUIFER, BEXAR
COUNTY,
TEXAS CONTINUED
STAT
ION
NUMBER:
293454098375701
WELL
NU
MBER
: AY-68-27-302
LATITUDE:
2934
54
LONG
ITUD
E:
0983757
WELL
DE
PTH:
517.00
SUMM
ARY
OF SE
LECT
ED WATER-QUALITY DATA COLLECTED AT
PE
RIOD
IC INTERVALS
DESCRIPTIVE STATISTICS
PERCENT
OF SAMPLES
IN WH
ICH
VALU
ES
WERE
LESS TH
AN OR EQUAL
TO THOSE
SHOWN
WATER QU
ALIT
Y CONSTITUENT
ARSE
NIC,
DISSOLVED (UG/L
AS AS)
BARI
UM,
DISSOLVED (U
G/L
AS BA)
CADMIUM, DISSOLVED (U
G/L
AS CD)
CHROMIUM,
DISSOLVED (U
G/L
AS CR
)CO
BALT
, DISSOLVED (UG/L
AS CO)
COPP
ER,
DISSOLVED (U
G/L
AS CU
)IR
ON,
DISSOLVED (U
G/L
AS FE)
LEAD
, DISSOLVED
(UG/
L AS PB
)MA
NGAN
ESE,
DISSOLVED (UG/L
AS MN)
NICK
EL,
DISSOLVED (U
G/L
AS NI)
SILV
ER,
DISSOLVED (U
G/L
AS AG
)STRONTIUM, DISSOLVED
(UG/
L AS
SR)
VANA
DIUM
, DISSOLVED (U
G/L
AS V)
ZINC,
DISSOLVED
(UG/
L AS ZN
)AL
UMIN
UM,
DISSOLVED (U
G/L
AS AL)
LITHIUM, DISSOLVED (UG/
L AS LI
)SE
LENI
UM,
DISSOLVED (UG/L
AS SE )
NAPHTHALENES,
POLY
CHLO
R. TO
TAL
(UG/
L)AL
DRIN
, TOTAL
(UG/
L)LI
NDAN
E, TO
TAL
(UG/L)
CHLO
RDAN
E, TOTAL
(UG/
L)ODD, TO
TAL
(UG/
L)DD
E, TO
TAL
(UG/
L)DOT, TO
TAL
(UG/
L)DI
ELDR
IN,
TOTAL
(UG/
L)EN
DOSU
LFAN
, TOTAL
(UG/L)
ENDRIN,
TOTAL
(UG/
L)ET
HION
, TO
TAL
(UG/L)
TOXA
PHEN
E, TOTAL
(UG/
L)HE
PTAC
HLOR
, TOTAL
(UG/L)
HEPTACHLOR EPOXIDE, TO
TAL
(UG/
L)METHOXYCHLOR, TOTAL
(UG/
L)PCB, TOTAL
(UG/
L)MA
LATH
ION,
TOTAL
(UG/L)
PARATHION, TOTAL
(UG/
L)DI
AZIN
ON,
TOTAL
(UG/L)
METHYL PA
RATH
ION,
TO
TAL
(UG/
L)2,
4-D,
TO
TAL
(UG/L)
2,4,5-T, TO
TAL
(UG/
L)SI
LVEX
, TOTAL
(UG/
L)TR
ITHI
ON,
TOTAL
(UG/
L)METHYL TRITHION,
TOTA
L (U
G/L)
MERC
URY,
DISSOLVED (UG/L
AS HG)
SAMPLE
SIZE 9 6 8 8 3 9 8 9 8 3 6 3 2 9 3 3 6 1 2 2 2 2 2 2 2 1 2 1 2 2 2 1 2 2 2 2 2 2 2 2 1 1 9
MAXIMUM
1.00
30.0
03.00
10.00
0.00
4.00
30.00
0.00
40.0
02.
000.00
970.00
1.50
620.
000.
000.00
2.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0. 10
MINI
MUM
0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.330. 1.
200. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
00 00 00 00 00 00 00 00 00 00 00 00 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
MEAN
0.22
19.6
70.38
3.75
2.44
4. 25
0.00
5.00
0.00
381.
11
0. 50
0.01
STANDARD
DEVI
ATIO
N 95
0.15
. 1. 5. 1. 10. 0. 14. 0.
139. 0. 0.
44
1.00
25
30.00
06
3.00
18
10.0
0
13
4.00
50
30.0
000
0.00
14
40.0
0
00
0.00
23
620.
00
84
2.00
03
0.10
75
0.50
30.0
00.00
10.0
0
3.00
3.00
0.00
0.00
0.00
490.
00
1.25
0.00
MEDIAN
50
0.00
29.0
00.00
0.00
3.00
0.00
0.00
0.00
0.00
380.
00
0.00
0.00
25
0.00
0.00
0.00
0.00
2.00
0.00
0.00
0.00
0.00
270.
00
0.00
0.00
5
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
200.00
0.00
0.00
-
TABLE
2.--STATISTICAL SU
MMAR
Y OF SE
LECT
ED WATER-QUALITY DATA IN TH
E EDWARDS AQ
UIFE
R, BEXAR
COUNTY,
TEXAS CONTINUED
STATION
NUMBER:
293518098373201
WELL
NUMBER:
AY-68-27-303
LATITUDE:
293518
LONG
ITUD
E:
0983732
SUMM
ARY
OF SE
LECT
ED WATER-QUALITY DATA COLLECTED AT
PE
RIOD
IC INTERVALS
DESCRIPTIVE STATISTICS
PERCENT
OF SAMPLES
IN WHICH
VALU
ES
WERE
LESS TH
AN OR EQ
UAL
TO THOSE
SHOW
N
SAMPLE
WATER QUALITY CONSTITUENT
SIZE
MA
XIMU
M
TEMPERATURE (D
EG C)
TEMPERATURE (D
EG C)
SPECIFIC CONDUCTANCE (U
MHOS
)OX
YGEN
DEMAND,
BIOCHEMICAL,
5 DAY
(MG/L)
OXYG
EN DE
MAND
, CHEMICALUOW LEVEL) (M
G/L)
OXYG
EN DEMAND, CH
EM ICAL
( H I GH
LE
VEL)
(MG/
L)PH
(U
NITS
)CA
RBON
DIOXIDE, DI
SSOL
VED
(MG/L
AS C0
2)ALKALINITY FIELD
(MG/
L AS
CA
C03)
BICARBONATE FE
T-FL
D (M
G/L
AS HC
03)
CARBONATE
FET-FLD (M
G/L
AS C0
3)SOLIDS, RESIDUE AT
10
5 DE
G. C, (M
G/L)
SOLI
DS,
VOLATILE,
SUSPENDED
(MG/
L)OIL
AND
GREASE (MG/L)
NITROGEN, TOTAL (M
G/L
AS N)
NITROGEN, ORGANIC TOTAL
(MG/
L AS
N)
NITROGEN, AMMONIA TOTAL (MG/L
AS N)
NITROGEN, NITRITE TOTAL (M
G/L
AS N)
NITR
OGEN
, NI
TRAT
E TO
TAL
(MG/
L AS
N)
NITROGEN, N02+N03 TOTAL (MG/L
AS N)
PHOS
PHOR
US,
TOTAL
(MG/L
AS P)
CARBON, ORGANIC TOTAL (MG/L
AS C)
CALCIUM, DISSOLVED (M
G/L
AS CA
)MA
GNES
IUM,
DISSOLVED
(MG/L
AS MG
)SODIUM,
DISSOLVED (M
G/L
AS NA)
SODI
UM ADSORPTION RA
TIO
POTASSIUM, DISSOLVED (M
G/L
AS K)
CHLO
RIDE
, DISSOLVED (MG/L
AS CL
)SULFATE, DISSOLVED (M
G/L
AS S0
4)FL
UORI
DE,
DISSOLVED (MG/L
AS F)
SILICA,
DISSOLVED (M
G/L
AS S102)
COLIFORM,
TOTA
L, IM
MED.
( COLS/100 ML)
COLI
FORM
, FECAL. ,0.
45 UM
-MF
( COL
S. 100 ML)
COLI
FORM
, FECAL, 0.7
UM-M
F( COLS/100 ML
)STREPTOCOCCI,
FECAL, KF
AGAR
( COLS/ 100
ML)
STREPTOCOCCI,
FECAL
(COL
S./1
00 ML
)METHYLENE BL
UE ACTIVE SUBSTANCE (M
G/L)
SOLIDS,
SUM
OF CONST IT
UENT
S, DIS
S. ( MG
/L )
SOLIDS,
DISSOLVED (T
ONS
PER
AC-F
T)BROMIDE, DISSOLVED
(MG/L
AS BR)
25 15 39 147 4 25 22 25 22 22 51 4 18 16 23 18 16 21 23 14 17 17 17 17 17 17 17 17 17 39 22 17 17 22 12 16 112
22.5
023.00
536.
001.
2021.00
14.00
7.30
96.00
254.
0031
0.00
0.00
8.00
0.00
4.00
3.80
1.40
0.37
0.04
2.70
2.50
0.03
6.40
96.0
014.00
5.50
0.10
1.00
14.00
16.00
0. 50
14.0
033
0.00
0.00
0.00
1.00
10.00
0.00
298.
000.41
0.10
MINI
MUM
22.
22.
470. 0. 4. 0. 6. 24.
238.
290. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.
85. 8. 3. 0. 0. 9. 1. 0. 10. 0. 0. 0. 0. 0. 0.
278. 0. 0.
00 50 00 20 00 00 70 00 00 00 00 00 00 00 25 00 00 00 01 01 00 00 00 70 80 10 70 60 00 10 00 00 00 00 00 00 00 00 38 10
MEAN
22.36
22.8
5516.26
0.66
10.00
7.10
38.1
4246.60
300.
140.00
3.40
2.47
0.36
0.04
0.01
1.95
1.97
0.01
1.47
91.47
10.2
24. 99
0.10
0.81
10.84
9.40
0.14
11. 18
10.08
0.00
0.00
0.06
0.45
0.00
288.13
0.39
STANDARD
DEVIATION
95
0.23
0.23
14.0
60.
337.
46
0.17
16.30
3.40
4.50
0.00
3.78
0.90
0.35
0.09
0.01
0.79
0.67
0.01
1.86
2.48
1.20
0.42
0.00
0.09
1.25
3. 70
0.10
0.81
53.20
0.00
0.00
0.24
2.13
0.00
4.84
0.01
22.5
023.00
536.
001.
2021
.00
7.30
90.90
252.
8031
0.00
0.00
8.00
3.80
1.40
0.34
0.04
2.70
2.49
0.03
6.40
96.0
014.00
5.50
0.10
1.00
14.00
16.0
00.
5014.00
50.0
00.
000.
001.
008.
500.
0029
8.00
0.41
75
22.5
023
.00
528.
000.
9520
.00
7.20
48.0
0249.50
301.
250.00
7.50
3.20
0.51
0.03
0.01
2.40
2.40
0.01
2.95
93.0
011
.00
5.25
0.10
0.90
11.50
12.0
00.
1511
.00
0.00
0.00
0.00
0.00
0.00
0.00
290.
000.39
MEDIAN
50
22.5
023
.00
516.
000.
606.
00
7.20
30.5
024
6.00
300.
000.
001.
00
2.55
0.29
0.01
0.00
2.20
2.20
0.01
0.75
92.0
010.00
5.00
0.10
0.80
10.0
08.80
0.10
11.00
0.00
0.00
0.00
0.00
0.00
0.00
288.
000.
39
25
22.0
022.50
508.00
0.40
4.00
7.00
30.0
0245.50
298.
500.00
0.50
2. 15
0.13
0.00
0.00
1.80
1.95
0.00
0.00
90.00
9.35
4.80
0.10
0.70
10.00
7.55
0.10
11.00
0.00
0.00
0.00
0.00
0.00
0.00
286.
000.39
5
22.00
22.5
049
4.00
0.20
4.00
6.70
24.0
0238.90
290.
600.00
0.00
0.25
0.00
0.00
0.00
0.01
0.03
0.00
0.00
85.0
08.70
3.80
0.10
0.70
9.60
1.00
0.10
11.0
00.
000.00
0.00
0.00
0.00
0.00
278.00
0.38
-
TABL
E 2.--STATISTICAL SU
MMAR
Y OF
SE
LECT
ED WATER-QUALITY DATA IN TH
E ED
WARD
S AQ
UIFE
R, BEXAR
COUN
TY,
TEXAS CONTINUED
STAT
ION
NUMBER:
293518098373201
WELL
NUMBER:
AY-68-27-303
LATITUDE:
293518
LONG
ITUD
E:
0983
732
SUMM
ARY
OF SELECTED WATER-QUALITY DATA COLLECTED AT
PERIODIC INTERVALS
DESC
RIPT
IVE
STATISTICS
PERC
ENT
OF SA
MPLE
S IN
WHICH
VALU
ES
WERE LE
SS TH
AN OR EQ
UAL
TO TH
OSE
SHOW
N
WATER QU
ALIT
Y CONSTITUENT
ARSE
NIC,
DISSOLVED
(UG/
L AS AS)
BARIUM,
DISSOLVED
(UG/
L AS BA
)CADMIUM, DISSOLVED
(UG/
L AS
CD
)CHROMIUM,
DISSOLVED
(UG/L
AS CR)
COPPER,
DISSOLVED (U
G/L
AS CU
)IRON,
DISSOLVED
(UG/
L AS FE)
LEAD
, DISSOLVED (UG/
L AS
PB)
MANG
ANES
E, DISSOLVED
(UG/
L AS
MN )
NICKEL,
DISSOLVED
(UG/L
AS NI)
SILV
ER,
DISSOLVED
(UG/
L AS
AG
)VA
NADI
UM,
DISSOLVED
(UG/
L AS V)
ZINC
, DISSOLVED (UG/L
AS ZN
)SE
LENI
UM,
DISSOLVED
(UG/
L AS
SE)
PERT
HANE
, TOTAL
(UG/
L)NAPHTHALENES,
POLY
CHLO
R. TOTAL
(UG/
L)ALDRIN,
TOTAL
(UG/L)
LIND
ANE,
TOTAL
(UG/
L)CH
LORD
ANE, TO
TAL
(UG/L)
ODD, TO
TAL
(UG/
L)DDE, TOTAL
(UG/L)
DOT, TOTAL
(UG/
L)DI
ELDR
IN,
TOTA
L (UG/L)
ENDO
SULF
AN,
TOTAL
(UG/
L)EN
DRIN
, TO
TAL
(UG/L)
ETHI
ON,
TOTAL
(UG/
L)TO
XAPH
ENE, TOTAL
(UG/L)
HEPT
ACHL
OR,
TOTA
L (U
G/L)
HEPTACHLOR EPOXIDE, TO
TAL
(UG/
L)METHOXYCHLOR, TOTAL
(UG/
L)PC
B, TO
TAL
(UG/L)
MALA
THIO
N, TO
TAL
(UG/
L)PARATHION, TO
TAL
(UG/L)
DIAZ
INON
, TOTAL
(UG/
L)METHYL PA
RATH
ION,
TO
TAL
(UG/
L)2,4-D, TOTAL
(UG/
L)2,
4,5-
T, TOTAL
(UG/L)
MIRE
X, TOTAL
(UG/
L)SI
LVEX
, TO
TAL
(UG/L)
TRIT
HION
, TOTAL
(UG/
L)METHYL TRITHION,
TOTA
L (U
G/L)
MERC
URY,
DISSOLVED
(UG/
L AS
HG)
SAMPLE
SIZE 9 8 9 9 9 9 13 9 2 9 4 9 9 1 3 4 4 4 4 4 4 4 4 4 4 4 4 4 3 4 4 4 4 4 3 3
1 3 4 4 9
MAXIMUM
2.00
200.
002.00
10.00
2.00
20.0
05.00
0.00
0.00
0.00
2.00
380.
006.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
MINI
MUM
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1.20
200.
000.
000.
000.
000.
000.
000.
000.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
MEAN
0.53
. 0. 1. 0. 8. 1. 0. 0.26
8. 0. 0.
60 75 22 78 22 89 38 00 00 89 78 00
STAN
DARD
DE
VIAT
ION
0.74
90.8
60.
673.
670.67
10.54
1.76
0.00
0.00
52.3
11.99
0.00
95
2.00
200.
002.00
10.00
2.00
20.00
5.00
0.00
0.00
380.
006.00
0.00
75
1.00
157.
500.00
3.00
0.00
20.0
02.
50
0.00
0.00
290.
000. 50
0.00
MEDI
AN
50
0.50
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
270.
000.
00
0.00
25
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
230.
000.00
0.00
5
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
200.00
0.00
0.00
-
TABLE
2. STATISTICAL SUMMARY OF SELECTED WATER-QUALITY DA
TA IN TH
E ED
WARD
S AQUIFER, BEXAR
COUNTY,
TEXAS CONTINUED
STAT
ION
NUMBER:
293519098373101
WELL NUMBER:
AY-68-27-305
LATI
TUDE
: 29
3519
LONGITUDE:
0983731
SUMMARY OF
SE
LECT
ED WATER-QUALITY DA
TA COLLECTED
AT PERIODIC IN
TERV
ALS
DESCRIPTIVE ST
ATIS
TICS
PERCENT OF SA
MPLE
S IN
WH
ICH
VALU
ES
WERE
LE
SS TH
AN OR EQUAL
TO THOSE
SHOW
N
SAMPLE
WATER QUALITY CONSTITUENT
SIZE
MAXI
MUM
TEMPERATURE (D
EC C)
SPEC
IFIC
CONDUCTANCE (U
MHOS
)OX
YGEN
DE
MAND
, BI
OCHE
MICA
L,
5 DAY
(MG/
L)OX
YGEN
DE
MAND
, CHEMICALUOW LE
VEL)
(MG/
L)OX
YGEN
DEMAND, CHEM ICA
L (H
IGH
LEVEL)(MG/L)
PH (UNITS)
CARB
ON DIOXIDE, DISSOLVED
(MG/
L AS
C02)
ALKALINITY FIELD
(MG/
L AS
CAC03)
BICARBONATE FE
T-FL
D (M
G/L
AS HC03)
CARBONATE
FET-
FLD
(MG/L
AS C03)
SOLI
DS,
RESIDUE
AT 105
DEG. C,
SU
S.(M
G/L)
OIL
AND
GREASE (M
G/L)
NITR
OGEN
, TO
TAL
(MG/
L AS N)
NITR
OGEN
, ORGANIC
TOTAL
(MG/L
AS N)
NITR
OGEN
, AMMONIA TOTAL
(MG/
L AS
N)
NITR
OGEN
, NITRITE
TOTAL
(MG/L
AS N)
NITROGEN,
NITRATE
TOTA
L (MG/
L AS
N)
NITR
OGEN
, N0
2+N0
3 TOTAL
(MG/L
AS N)
PHOS
PHOR
US,
TOTAL
(MG/
L AS P)
CARB
ON,
ORGANIC
TOTAL
(MG/L
AS C)
CARBON,
ORGA
NIC
DISSOLVED (M
G/L
AS C)
HARDNESS (M
G/L
AS CAC03)
HARD
NESS
, NONCARBONATE (MG/L
CAC0
3)CA
LCIU
M, DISSOLVED
(MG/L
AS CA
)MA
GNES
IUM,
DISSOLVED (M
G/L
AS MG
)SODIUM,
DISSOLVED
(MG/L
AS NA)
SODI
UM ADSORPTION RATIO
POTA
SSIU
M, DISSOLVED (MG/L
AS K)
CHLO
RIDE
, DISSOLVED (M
G/L
AS CL
)SULFATE, DISSOLVED
(MG/L
AS S04)
FLUO
RIDE
, DISSOLVED (M
G/L
AS F)
SILICA,
DISSOLVED
(MG/
L AS SI02
)CO
LIFO
RM,
TOTA
L, IM
MED.
( COL
S. /100
ML)
COLI
FORM
, FECAL, 0.
7 UM
-MF(
COL
S . /100
ML)
STREPTOCOCCI,
FECAL, KF
AGAR
( CO
LS. /100 ML
)METHYLENE
BLUE
ACTIVE SUBSTANCE
(MG/
L)SOLIDS,
SUM
OF CONST IT
UENT
S, DISS. (
MG/L
)SOLIDS,
DISSOLVED
(TON
S PE
R AC-FT)
BROMIDE, DISSOLVED (M
G/L
AS BR)
13 127 5 3
129
129 9 3 3 13 11 13 13 11 12 13 9 5 12 12 12 12 12 12 12 12 12 12 12 12 122 7 11 9 2
22.5
0547.00
1.40
20.00
9.00
7.20
96.0
026
0.00
310.
000.00
3.00
0.00
3.40
1.10
0.66
0.05
2.80
2.80
0.04
2.40
11.00
290.
0051.00
100.00
9.90
5.40
0.10
0.90
15.0
023.00
0.40
14.0
06299.99
1.00
83.0
00.10
306.
000.
420. 10
MINIMUM
21.0
048
5.00
0.20
8.00
2.00
6.60
31.0
023
8.00
290.
000.00
0.00
0.00
1.80
0.09
0.00
0.00
1.40
1.40
0.00
0.40
0.80
260.
008.00
90.00
7.90
4.40
0.10
0.70
7.90
0.00
0.10
10.00
0.00
0.00
0.00
0.00
287.
000.39
0.10
MEAN
22. 12
529.
920.
7711
.80
6.95
51.33
250.
5030
4.44
0.00
2.88
0.41
0.07
0.01
2.31
2.29
0.01
1.26
4.32
272.
5021.67
94.25
8.98
5.10
0.10
0.81
11.12
10.1
30.13
11.3
31040.33
0.08
15.1
70.
01294.91
0.40
STANDARD
DEVIATION
0.42
15.92
0.48
4.97
0.18
19.33
5.54
7.26
0.00
0.51
0.31
0.18
0.02
0.43
0.40
0.01
0.56
4.45
10.55
11.75
3.17
0.57
0.27
0.00
0.08
1.69
5.11
0.09
0.98
1844.92
0.29
27.50
0.04
6.06
0.01
95
22.
547. 1.
20. 7.
96.
260.
310. 0. 3. 1. 0. 0. 2. 2. 0. 2. 11.
290. 51.
100. 9. 5. 0. 0.
15.
23. 0.
14.
6299. 1.
83. 0.
306. 0.
50 00 40 00 20 00 00 00 00 40 10 66 05 80 80 04 40 00 00 00 00 90 40 10 90 00 00 40 00 99 00 00 10 00 42
75
22.5
053
9.25
1.30
16.50
7.00
56.0
025
4.00
310.
000.00
3.30
0.47
0.02
0.02
2.60
2.58
0.02
1.50
8.90
280.
0028
.00
95.7
59.50
5.28
0.10
0.90
12.0
010
.75
0.10
11.75
1475.00
0.00
27.0
00.00
299.
000.41
MEDI
AN
50
22.0
0533.50
0.70
9.00
7.00
48.0
025
0.00
310.
000.00
2.90
0.38
0.00
0.00
2.40
2.35
0.01
1.30
1.60
270.00
19.0
094.00
8.85
5.15
0.10
0.80
11.0
09.
900.10
11.0
031
0.00
0.00
0.00
0.00
294.
000.
40
25
22.0
052
6.25
0.30
8.50
6.83
38.5
024
7.00
300.
000.00
2.60
0.18
0.00
0.00
2.00
2.03
0.00
0.90
1.10
262.
5014.75
92.00
8.60
5.00
0.10
0.73
10.10
8.63
0. 10
11.0
00.00
0.00
0.00
0.00
291.00
0.40
5
21.0
0485.00
0.20
8.00
6.60
31.0
023
8.00
290.
000.00
1.80
0.09
0.00
0.00
1.40
1.40
0.00
0.40
0.80
260.00
8.00
90.00
7.90
4.40
0.10
0.70
7.90
0.00
0.10
10.0
00.00
0.00
0.00
0.00
287.
000.
39
-
TABL
E 2.--STATISTICAL SU
MMAR
Y OF
SE
LECT
ED WATER-QUALITY DA
TA IN THE
EDWARDS AQUIFER, BEXAR
COUNTY,
TEXAS--CONTINUED
STAT
ION
NUMB
ER:
293519098373101
WELL
NUMBER:
AY-68-27-305
LATITUDE:
293519
LONG
ITUD
E:
0983731
SUMM
ARY
OF SELECTED WATER-QUALITY DATA COLLECTED AT
PE
RIOD
IC INTERVALS
DESCRIPTIVE STATISTICS
PERCENT
OF SAMPLES
IN WH
ICH
VALU
ES
WERE LESS TH
AN OR EQUAL
TO THOSE
SHOWN
WATER QU
ALIT
Y CONSTITUENT
ARSE
NIC,
DISSOLVED (U
G/L
AS AS
)BA
RIUM
, DISSOLVED
(UG/
L AS
BA)
CADMIUM, DISSOLVED (UG/L
AS CD)
CHROMIUM,
DISSOLVED
(UG/
L AS
CR)
COPP
ER,
DISSOLVED (U
G/L
AS CU)
IRON
, DISSOLVED
(UG/
L AS
FE)
LEAD,
DISSOLVED (U
G/L
AS PB)
MANG
ANES
E, DISSOLVED
(UG/
L AS
MN)
NICKEL,
DISSOLVED (U
G/L
AS NI)
SILV
ER,
DISSOLVED
(UG/
L AS AG
)VA
NADI
UM,
DISSOLVED (U
G/L
AS V)
ZINC,
DISSOLVED
(UG/
L AS ZN
)SELE
NIUM
, DISSOLVED (U
G/L
AS SE
)PERT
HANE
, TO
TAL
(UG/L)
NAPHTHALENES,
POLY
CHLO
R. TOTAL
(UG/
L)ALDRIN,
TOTAL
(UG/L)
LIND
ANE,
TOTAL
(UG/
L)CH
LORD
ANE,
TO
TAL
(UG/L)
ODD, TOTAL
(UG/
L)DDE, TO
TAL
(UG/L)
DOT, TOTAL
(UG/
L)DI
ELDR
IN,
TOTAL
(UG/L)
ENDO
SULF
AN,
TOTAL
(UG/
L)EN
DRIN
, TOTAL
(UG/
L)ET
HION
, TO
TAL
(UG/
L)TO
XAPH
ENE,
TO
TAL
(UG/L)
HEPT
ACHL
OR,
TOTAL
(UG/
L)HEPTACHLOR EPOXIDE, TO
TAL
(UG/
L)METHOXYCHLOR, TOTAL
(UG/
L)PCB, TO
TAL
(UG/L)
MALA
THIO
N, TO
TAL
(UG/
L)PARATHION, TOTAL
(UG/L)
DIAZ
INON
, TOTAL
(UG/
L)ME
THYL
PA
RATH
ION,
TO
TAL
(UG/L)
2,4-
D, TOTAL
(UG/
L)2,
4,5-
T, TO
TAL
(UG/L)
MIRE
X, TOTAL
(UG/
L)SI
LVEX
, TOTAL
(UG/
L)TRIT
HION
, TO
TAL
(UG/
L)METHYL TRITHI
ON,
TOTA
L (UG/L)
MERC
URY,
DISSOLVED (U
G/L
AS HG)
SAMPLE
SIZE 9 9 9 9 9 9 12 9
2 9 4 9 9 1 2 3 3 3 3 3 3 3 3 3 3 3 3 3 2 3 3 3 3 3 4 4 1 4 3 3 9
MAXI
MUM
1.00
300.
000.00
10.00
5.00
70.00
5.00
20.00
2.00
0.00
2.30
2900.00
3.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
MINIMUM
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1.40
2000.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
MEAN
0.66. 0. 1. 2. 10. 1. 4. 0.
2288
. 0. 0.
44 44 00 11 11 33 83 89 00 89 44 00
STANDARD
DEVIATION
0.53
108.
100.00
3.33
1.83
23.3
11.
908.
67
0.00
280.
381.
01
0.00
95 1.00
300.
000.00
10.00
5.00
70.0
05.
0020.0
0
0.00
2900
.00
3.00
0.00
75
1.00
117.
500.00
0.00
3. 50
11.5
03.75
12.0
0
0.00
2450.00
0.50
0.00
MEDI
AN
50
0.00
30.00
0.00
0.00
2.00
0.00
1. 50
0.00
0.00
2200.00
0.00
0.00
25
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2100
.00
0.00
0.00
5
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2000.00
0.00
0.00
-
TABLE
2. STATISTICAL SUMMARY OF SE
LECT
ED WATER-QUALITY DA
TA IN THE
EDWARDS
AQUIFER, BE
XAR
COUN
TY,
TEXA
S CONTINUED
STATION NU
MBER
: 293402098404501
WELL
NUMBER:
AY-68-27-503'
LATITUDE:
293402
LONG
ITUD
E:
0984045
WELL
DE
PTH:
43
5.00
SUMM
ARY
OF SE
LECT
ED WATER-QUALITY DATA COLLECTED AT
PERIODIC INTERVALS
DESCRIPTIVE ST
ATIS
TICS
PERCENT
OF SA
MPLE
S IN WHICH
VALU
ES
WERE LE
SS TH
AN OR EQUAL
TO THOSE
SHOWN
WA
TER
Q
UA
LIT
Y
CO
NS
TIT
UE
NT
TE
MP
ER
AT
UR
E
(DE
G
C)
SP
EC
IFIC
C
ON
DU
CT
AN
CE
(U
MH
OS
)O
XY
GE
N
DE
MA
ND
, B
IOC
HE
MIC
AL,
5 D
AY
(M
G/L
)O
XY
GE
N
DE
MA
ND
, CH
EM
ICA
L (L
OW
L
EV
EL
)(M
G/L
)PH
(U
NIT
S)
CA
RB
ON
D
IOX
IDE
, D
ISS
OLV
ED
(M
G/L
A
S
C0
2)
AL
KA
LIN
ITY
F
IEL
D
(MG
/L
AS
C
AC
03
)B
ICA
RB
ON
AT
E
FE
T-F
LD
(M
G/L
A
S
HC
03)
CA
RB
ON
AT
E
FE
T-F
LD
(M
G/L
A
S
CO
S)
OIL
A
ND
G
RE
AS
E
(MG
/L)
NIT
RO
GE
N,
TO
TA
L (M
G/L
A
S
N)
NIT
RO
GE
N,
OR
GA
NIC
T
OT
AL
(MG
/L
AS
N
)N
ITR
OG
EN
, A
MM
ON
IA
TO
TA
L (M
G/L
A
S
N)
NIT
RO
GE
N,
NIT
RIT
E
TO
TA
L (M
G/L
A
S
N)
NIT
RO
GE
N,
NIT
RA
TE
T
OT
AL
(MG
/L
AS
N
)N
ITR
OG
EN
, N
02
+N
03
T
OT
AL
(MG
/L
AS
N
)P
HO
SP
HO
RU
S,
TO
TA
L (M
G/L
A
S
P)
CA
RB
ON
, O
RG
AN
IC
DIS
SO
LVE
D
(MG
/L
AS
C
)H
AR
DN
ES
S
(MG
/L
AS
C
AC
03)
HA
RD
NE
SS
, N
ON
CA
RB
ON
AT
E
(MG
/L
CA
C03)
CA
LC
IUM
, D
ISS
OLV
ED
(M
G/L
A
S
CA
)M
AG
NE
SIU
M,
DIS
SO
LV
ED
(M
G/L
A
S
MG
)S
OD
IUM
, D
ISS
OLV
ED
(M
G/L
A
S
NA
)S
OD
IUM
A
DS
OR
PT
ION
R
AT
IOP
OT
AS
SIU
M,
DIS
SO
LV
ED
(M
G/L
A
S
K)
CH
LO
RID
E,
DIS
SO
LV
ED
(M
G/L
A
S
CL)
SU
LF
AT
E,
DIS
SO
LV
ED
(M
G/L
A
S
S04)
FLU
OR
IDE
, D
ISS
OL
VE
D
(MG
/L
AS
F
)S
ILIC
A,
DIS
SO
LV
ED
(M
G/L
A
S
SI0
2)
CO
LIF
OR
M,
TO
TA
L,
IMM
ED
. ( C
OLS
. /1
00
M
L)
CO
LIF
OR
M,
FE
CA
L, 0
.45
UM
-M
F (
CO
LS. /1
00
M
L)
CO
LIF
OR
M,
FE
CA
L,
0.7
U
M-M
F(
CO
LS .
/10
0
ML)
ST
RE
PT
OC
OC
CI,
F
EC
AL
, K
F A
GA
R(
CO
LS .
/10
0
ML
ST
RE
PT
OC
OC
CI,
F
EC
AL
(CO
LS
./1
00
M
L)M
ET
HY
LEN
E
BLU
E
AC
TIV
E
SU
BS
TA
NC
E
(MG
/L)
SO
LID
S,
SUM
O
F C
ON
ST
ITU
EN
TS
, D
ISS
.(M
G/L
)S
OL
IDS
, D
ISS
OL
VE
D
(TO
NS
P
ER
A
C-F
T)
BR
OM
IDE
, D
ISS
OL
VE
D
(MG
/L
AS
B
R)
SA
MP
LE
SIZ
E
MA
XIM
UM
18 211 1
15 13 15
13 13 1 10 10 17
109
17 16 12 14 14 14 14 13
13 13 16 15 12 13
21 137
) 7
138
13 10 1
25
.50
557.0
00
.20
1.0
07
.70
58.0
02
40
.00
29
2.0
00
.00
0.0
02
.30
0.5
70
.10
0.0
21.8
02.7
00
.03
10
.00
27
0.0
03
9.0
08
3.0
01
6.0
07.4
00
.20
1.2
017.0
023.0
00.2
01
2.0
03
0.0
00
.00
0.0
01
4.0
02.0
00
.10
29
4.0
00
.40
0.1
0
MIN
IMU
M
20
.508.
0.
1.
6.
9.
230.
280.
0.
0.
1.
0.
0.
0. 1. 1. 0. 0.
26
0.
19
.7
8.
14
.6
.0.
0.
11
.16.
0.
10.
0.
0.
0.
0.
0.
0.
28
2.
0.
0.
00 00 20
00 90 20 00 00 00 00 40
00 00
00 30 20 00
00 00 00 00 00 10
20 70 00 00 10 00 00 00 00 00
00 00 00 38 10
MEA
N
22.
175
24
.81
7.2
32
8.7
8236.2
7288.0
80
.00
1.8
70
.19
0.0
20
.01
1.6
41
.68
0.0
11
.81
26
5.7
128.4
38
1.0
715.0
76
.84
0.2
00
.94
13.8
118.5
30
.18
11
.00
1.4
80
.00
0.0
02
.29
0.3
10
.03
28
9.1
50
.39
STA
ND
AR
D
DE
VIA
TIO
N
95
1.3
413.8
0
0.2
314.2
53
. 15
3.1
70
.00
0.2
60.2
20
.03
0.0
10.
140
.31
0.0
12
.81
5.
145
.92
1.9
40
.62
0.3
80
.00
0.
131
.83
2.
130
.05
0.5
86
.54
0.0
00
.00
5.2
20
.75
0.0
53.1
30
.01
25
.50
55
6.5
0
7.7
058.0
0240.0
0292.0
00
.00
2.3
00.5
70
.10
0.0
21.8
02.7
00
.03
10.0
02
70
.00
39
.00
83
.00
16.0
07.4
00
.20
1.2
017.0
02
3.0
00
.20
12.0
027.1
00
.00
0.0
01
4.0
02.0
00
.10
29
4.0
00
.40
75
22.6
25
33
.50
7.4
041.0
02
38
.00
29
0.0
00
.00
2.0
50
.40
0.0
50
.01
1.7
01
.70
0.0
12
.73
270.0
031.7
58
3.0
015.2
57
.15
0.2
01
.00
14.7
52
0.0
00
.20
11.0
00
.00
0.0
00
.00
2.0
00
.00
0.0
82
91
.00
0.4
0
ME
DIA
N
50
21
.55
52
1.0
0
7.2
02
9.0
0237.0
0289.0
00
.00
1.8
50
.10
0.0
00
.00
1.7
01.7
00
.00
0.6
02
70
.00
28
.50
81.5
015.0
06
.90
0.2
00
.90
13
.00
18
.00
0.2
01
1.0
00
.00
0.0
00
.00
0.0
00
.00
0.0
0289.0
00
.39
25
21.
505
14
.50
7.0
018.0
02
35
.00
28
7.0
00
.00
1.7
50
.02
0.0
00
.00
1.6
01
.60
0.0
00
.25
260.0
023.2
57
9.0
015.0
06
.55
0.2
00
.90
13.0
01
7.0
00
.12
11.0
00
.00
0.0
00
.00
0.0
00
.00
0.0
02
87
.50
0.3
9
5
20
.00
508.2
0
6.9
09
.20
23
0.0
0280.0
00
.00
1.4
00
.00
0.0
00
.00
1.3
01
.20
0.0
00
.00
260.0
01
9.0
07
8.0
01
4.0
06
.10
0.2
00
.70
11.0
01
6.0
00
.10
10
.00
0.0
00
.00
0.0
00
.00
0,0
00
.00
28
2.0
00
.38
-
TA
BLE
2. S
TA
TIS
TIC
AL
SU
MM
AR
Y
OF
SE
LEC
TE
D
WA
TE
R-Q
UA
LIT
Y
DA
TA
IN
THE
ED
WAR
DS
AQ
UIF
ER
, B
EX
AR
C
OU
NT
Y,
TE
XA
S--
CO
NT
INU
ED
STATION NU
MBER
: 293402098404501
WELL
NUMBER:
AY-68-27-503
LATITUDE:
2934
02
LONG
ITUD
E:
0984045
WELL
DE
PTH:
43
5.00
SUMMARY OF SE
LECT
ED WATER-QUALITY DATA COLLECTED AT
PERIODIC INTERVALS
DESCRIPTIVE STATISTICS
PERC
ENT
OF SAMPLES IN WHICH
VALU
ES
WERE
LESS TH
AN OR EQ
UAL
TO THOSE
SHOW
N
WATER QU
ALIT
Y CONSTITUENT
ARSE
NIC,
DISSOLVED (UG/L
AS AS)
BARIUM,
DISSOLVED
(UG/
L AS
BA
)BORON, DISSOLVED (UG/
L AS
B)
CADM
IUM,
DI
SSOLVED
(UG/L
AS CD
)CHROMIUM,
DISSOLVED
(UG/
L AS
CR
)COBALT,
DISSOLVED
(UG/
L AS
CO
)CO
PPER
, DISSOLVED
(UG/
L AS
CU)
IRON,
DISSOLVED (UG/L
AS FE
)LE
AD,
DISSOLVED (U
G/L
AS PB
)MANGANESE, DISSOLVED
(UG/
L AS
MN )
NICKEL,
DISSOLVED (U
G/L
AS NI
)SI
LVER
, DISSOLVED
(UG/
L AS
AG
)ST
RONT
IUM,
DISSOLVED
(UG/
L AS
SR)
VANADIUM,
DISSOLVED
(UG/L
AS V)
ZINC,
DISSOLVED (U
G/L
AS ZN)
ALUMINUM,
DISSOLVED
(UG/
L AS
AL
)LI
THIU
M, DISSOLVED
(UG/
L AS LI)
SELENIUM,
DISSOLVED
(UG/
L AS SE
)NAPHTHALENES,
POLYCHLOR. TOTAL
(UG/
L)ALDRIN,
TOTAL
(UG/L)
LIND
ANE,
TOTAL
(UG/
L)CH
LORD
ANE,
TOTAL
(UG/L)
ODD, TO
TAL
(UG/
L)DDE, TO
TAL
(UG/L)
DOT, TOTAL (U
G/L)
DIEL
DRIN
, TOTAL
(UG/L)
ENDO
SULF
AN,
TOTAL
(UG/
L)EN
DRIN
, TOTAL
(UG/L)
ETHI
ON,
TOTAL (U
G/L)
TOXA
PHEN
E, TOTAL
(UG/L)
HEPT
ACHL
OR,
TOTAL
(UG/
L)HEPTACHLOR, EP
OXID
E TOTAL
(UG/
L)METHOXYCHLOR, TOTAL
(UG/
L)PCB, TO
TAL
(UG/L)
MALA
THIO
N, TO
TAL
(UG/
L)PA
RATH
ION,
TOTAL
(UG/L)
DIAZ
INON
, TOTAL
(UG/
L)METHYL PA
RATHION, TOTAL
(UG/
L)2,4-D, TOTAL (U
G/L)
2,4,5-T, TO
TAL
(UG/L)
SILV
EX,
TOTA
L (U
G/L)
TRITHION,
TOTAL
(UG/L)
METHYL TRITHION.
TOTAL
(UG/
L)MERCURY, DI
SSOLVED
(UG/
L AS HG)
SAMPLE
SIZE
11 81
10 10 3 12 11 11 113 8 3 2 12 4 3 81 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 2 2 2 2 2 2 2 2 2 11
MAXIMUM
1.00
300.
0050
.00
0.00
10.0
00.00
7.00
20.00
2.00
50.00
0.00
0.00
440.00
2.20
30.00
0.00
0.00
o.od
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.40
MINI
MUM
0.00
0.00
50.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
360.
001.20
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
STAN
DARD
ME
AN
DEVIATION
95
0.27
0.47
1.
0052.50
101.
10
300.
00
0.00
0.
00
0.00
2.00
4.22
10.00
2.75
2.
01
7.00
3.64
8.09
20.0
00.45
0.82
2.00
4.55
15.08
50.00
0.00
0.00
0.00
4.92
9.77
30
.00
0.00
0.00
0.00
0.06
0.
14
0.40
MEDI
AN
75
50
25
1.00
0.00
0.00
30.0
0 30
.00
0.00
0.00
0.
00
0.00
2.50
0.00
0.00
4.00
2.50
1.
250.00
0.00
0.00
1.00
0.00
0.00
0.00
0.
00
0.00
0.00
0.
00
0.00
4.75
0.
00
0.00
0.00
0.
00
0.00
0.00
0.
00
0.00
5
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
-
TA
BLE
2. S
TA
TIS
TIC
AL
SUM
MAR
Y O
F S
ELE
CT
ED
W
AT
ER
-QU
ALI
TY
D
ATA
IN
TH
E
EDW
ARD
S A
QU
IFE
R,
BE
XA
R
CO
UN
TY
, T
EX
AS
CO
NT
INU
ED
STATION NUMBER:
293345098405801
WELL
NUMBER:
AY-68-27-504
LA
TIT
UD
E:
293345
LON
GIT
UD
E:
0984058
WE
LL
DE
PT
H:
50
8.0
0
SUMM
ARY
OF SELECTED WATER-QUALITY DATA COLLECTED AT
PERIODIC INTERVALS
DESCRIPTIVE ST
ATIS
TICS
PERCENT
OF SA
MPLE
S IN WHICH
VALU
ES
WERE
LE
SS TH
AN OR
EQUAL
TO THOSE
SHOWN
SA
MP
LE
WA
TER
Q
UA
LIT
Y
CO
NS
TIT
UE
NT
S
IZE
M
AX
IMU
M
TE
MP
ER
AT
UR
E
(DE
G
C)
SP
EC
IFIC
C
ON
DU
CTA
NC
E
(UM
HO
S)
OX
YG
EN
D
EM
AN
D,
BIO
CH
EM
ICA
L,
5 D
AY
(M
G/L
)O
XY
GE
N
DE
MA
ND
, C
HE
MIC
ALU
OW
L
EV
EL
)(M
G/L
)PH
(U
NIT
S)
CA
RB
ON
D
IOX
IDE
, D
ISS
OLV
ED
(M
G/L
A
S
C0
2)
ALK
ALIN
ITY
F
IELD
(M
G/L
A
S
CA
C03)
BIC
AR
BO
NA
TE
F
ET
-FLD
(M
G/L
A
S
HC
03)
CA
RB
ON
ATE
F
ET
-FLD
(M
G/L
A
S
C03)
OIL
AN
D
GR
EA
SE
(M
G/L
)N
ITR
OG
EN
, T
OT
AL
(MG
/L
AS
N
)N
ITR
OG
EN
, O
RG
AN
IC
TO
TA
L (M
G/L
AS
N
)N
ITR
OG
EN
, A
MM
ON
IA
TO
TA
L (M
G/L
A
S
N)
NIT
RO
GE
N,
NIT
RIT
E
TO
TA
L (M
G/L
AS
N
)N
ITR
OG
EN
, N
ITR
AT
E
TO
TA
L (M
G/L
A
S
N)
NIT
RO
GE
N,
N0
2+
N0
3
TO
TA
L (M
G/L
AS
N
)P
HO
SP
HO
RU
S,
TO
TA
L (M
G/L
A
S
P)
CA
RB
ON
, O
RG
AN
IC
DIS
SO
LVE
D
(MG
/L
AS
C
)H
AR
DN
ES
S
(MG
/L
AS
C
AC
03)
HA
RD
NE
SS
, N
ON
CA
RB
ON
ATE
(M
G/L
C
AC
03)
CA
LC
IUM
, D
ISS
OLV
ED
(M
G/L
A
S
CA
)M
AG
NE
SIU
M,
DIS
SO
LVE
D
(MG
/L
AS
M
G)
SO
DIU
M,
DIS
SO
LVE
D
(MG
/L
AS
N
A )
SO
DIU
M
AD
SO
RP
TIO
N
RA
TIO
PO
TA
SS
IUM
, D
ISS
OLV
ED
(M
G/L
A
S
K)
CH
LO
RID
E,
DIS
SO
LVE
D
(MG
/L
AS
C
DS
ULF
AT
E,
DIS
SO
LVE
D
(MG
/L
AS
S
04)
FL
UO
RID
E,
DIS
SO
LVE
D
(MG
/L
AS
F
)S
ILIC
A,
DIS
SO
LVE
D
(MG
/L
AS
S
I02
)C
OLI
FO
RM
, T
OT
AL,
IMM
ED
. ( C
OLS
. /1
00
M
L)C
OLI
FO
RM
, F
EC
AL
, 0
.45
U
M-M
F(
CO
LS. /1
00
M
L)
CO
LIF
OR
M,
FE
CA
L,
0.7
U
M-M
F(
CO
LS .
/10
0
ML)
ST
RE
PT
OC
OC
CI,
FE
CA
L,
KF
AG
AR
( C
OLS
. /1
00
M
L)
ST
RE
PT
OC
OC
CI,
FE
CA
L (C
OL
S./
10
0
ML)
ME
TH
YLE
NE
B
LUE
A
CT
IVE
S
UB
ST
AN
CE
(M
G/L
)S
OL
IDS
, SU
M
OF
CO
NS
TIT
UE
NT
S,
DIS
S.(
MG
/L)
SO
LID
S,
DIS
SO
LVE
D
(TO
NS
PE
R
AC
-FT
)B
RO
MID
E,
DIS
SO
LVE
D
(MG
/L
AS
B
R)
23 222 1 16 14 16 14 141 10 9 20 109
20 20 12 16 16 16 18 16 16 16 20 18
15 16 25 18 6 6 18 11 158 1
24
.00
587.0
00
.60
7.0
08
.00
62
.00
27
2.0
03
32
.00
0.0
00
.00
2.2
00
.95
0.2
60
.03
1.2
01.9
00.
126
.10
30
0.0
04
8.0
09
4.0
017.0
09
.20
0.2
02
.20
18.0
03
4.0
00
.30
43
5.0
01400.0
02
50
.00
30
.00
46
.00
28
00
.00
0.1
0336.0
00
.46
0.1
0
MIN
IMU
M
20
.00
44
9.0
00
.10
7.0
06
.90
4.9
01
97
.00
240.0
00
.00
0.0
01
.00
0.0
80
.00
0.0
00
.87
0.8
80
.00
0.3
02
20
.00
22.0
07
1.0
01
0.0
06
.80
0.2
01
.00
10
.00
19
.00
0.2
01
0.0
00
.00
0.0
00
.00
0.0
00
.00
0.0
02
49
.00
0.3
40
.10
MEA
N
22.
54
0.
7.
26
.246.
30
0. 0. 1.
0.
0.
0.
1. 1. 0. 1.
27
8.
30.
88.
13.
8.
0.
1.
14.
24
.0.
37
.2
81
.1
9.
9.
14.
16
7.
0.
30
8.
0.
12 41 31 36 25
43 00 45
36 03 01 01 25 03 68 13
25 44
67 44
20 46 20 83 21 37 92 83 00 33 83 02 40 41
STA
ND
AR
D
DE
VIA
TIO
N
95
1.2
334.4
1
0.3
317.3
917.7
32
3.2
40
.00
0.3
70
.36
0.0
60
.01
0.
130
.35
0.0
31
.64
19.7
46
.59
5.9
91.7
80
.70
0.0
00
.31
2.0
73
.88
0.0
41
06
.04
490.0
658.9
812.5
918.1
4657.5
60
.04
22.1
70
.04
24
.00
58
5.8
0
8.0
06
2.0
02
72
.00
33
2.0
00
.00
2.2
00
.95
0.2
50
.03
1.2
01
.89
0.
126
.10
30
0.0
04
8.0
09
4.0
017.0
09
.20
0.2
02
.20
17.9
03
4.0
00
.30
43
5.0
01400.0
0250.0
03
0.0
04
6.0
02800.0
00
.10
33
6.0
00
.46
75
23
.00
56
4.0
0
7.4
74
1.2
52
55
.50
313.5
00
.00
1.7
30.7
60
.05
0.0
11
.15
1.5
50
.05
2.5
82
90
.00
35
.75
93
.00
14.2
59
.00
0.2
01
.50
16.0
02
6.0
00
.20
11.7
53
85
.00
8.5
02
1.7
53
0.2
513.7
50
.00
32
0.0
00
.44
ME
DIA
N
50
22
.00
55
5.5
0
7.3
519.5
02
51
.00
30
7.0
00
.00
1.4
00
.16
0.0
00
.00