memorandum - denver · memorandum polrep #16 vb/i70, ou2 removal action october 31, 2016 page 2...

Memorandum To: Dania Zinner, EPA RPM, VB/I70 Superfund Site

From: Timothy C. Shangraw

Date: October 31, 2016

Re: POLREP #16 - Vasquez Boulevard/Interstate 70 (VB/I70) Superfund Site, Operable

Unit 2, Removal Action

======================================================================= On behalf of the City and County of Denver (Respondent), Engineering Management Support, Inc. (EMSI) is submitting this Pollution Report (POLREP #16) in accordance with Section 4.c of Appendix C to the Administrative Settlement Agreement and Order on Consent for Removal Action, for the subject Superfund Site (the Site). This report follows the outline detailed in Section 4.c of Appendix C, and contains pertinent new information specified in the Superfund Removal Procedures, Removal Response Reporting: POLREP and OSC Reports (EPA, 1994). Section I – Heading The date, site name, report author, report recipient, and report number are presented above. Section II – Response Information

This reporting period extended from October 1 through October 31, 2016 during which time: 1) technical and cost proposals from three prospective Prime Subcontractors were reviewed and scored, and a preferred Prime Subcontractor was recommended to Denver’s Executive Oversight Committee; 2) a Supplemental Field Sampling Plan (SFSP) to collect additional soil samples for lead and arsenic characterization from up to 36 borings in the former Union Pacific Railroad (UPRR) property and Globeville Landing Park was prepared (attached to this POLREP); 3) the field sampling portion of the SFSP was implemented during the week of October 17

th; 4)

additional pilot-testing of groundwater from beneath the Coliseum parking lot was performed; and 5) community outreach planning for community meetings on October 25

th , November 3

rd,

and November 5th

occurred. The Respondent, CDPHE, and EPA participated in the October 25th

community outreach meeting. They also participated in an EPA status meeting on October 26

th

(meeting agenda attached to this POLREP). Analytical results from the SFSP soil sampling and groundwater treatability testing programs will be a submitted to EPA when they become available.

As discussed in POLREP#14, sampling of shallow soils from 0-5 feet deep for lead and arsenic from five borings in the former UPRR property occurred in August 2016. Lead was detected at concentrations ranging from 101 to 466 mg/kg. Arsenic was detected at concentrations ranging from 8.6 to 48.3 mg/kg. Sampling locations, procedures, analytical methods, and comparisons of analytical results to threshold values are discussed in a letter report prepared by CTL-Thompson, Inc., which is attached to this POLREP.

Engineering Management Support, Inc.

Memorandum

POLREP #16

VB/I70, OU2 removal Action

October 31, 2016

Section III – Issues, Resolutions, and Planned Activities A number of questions were raised by concerned citizens at the October 25

th community

outreach meeting. In addition, the Respondent, with support from EPA and CDPHE is planning

two additional “Drop-in” meetings; one on November 3rd

from 5:30 pm to 7 pm at the Stapleton

Rec Center Gymnasium (5090 Broadway), and another on November 5th

from 10 am to 11:30

am at the Garden Place Elementary School Cafeteria. Meeting announcements, locations, and

topics of interest are being disseminated via flyers that are being distributed to residential homes,

schools, churches, businesses, and neighborhood organization leaders within a ½ mile radius of

the GLO site. Additionally, personal email invitations were sent to key stakeholders.

The current implementation schedule for the GLO Project is as follows:

Selection of a construction contractor (the Ames Construction team has been selected as

the Prime Subcontractor. Contract negotiations are underway)

Preparation of Work Orders for both the existing Integration Contractor (Kiewit) and

Prime Subcontractor (Ames) (mid-late November)

Initial mobilization and permitting (late November)

Start earthwork (December)

Construction milestones will be determined following contract award

To keep EPA and CDPHE informed of any issues that might impact constructability or

implementation, Respondent will continue to hold monthly status meetings at which EPA and

CDPHE will be updated, and issues can be addressed. The next meeting is scheduled for

November 30th

at 9:00 am at the Webb building. Respondent will arrange for a call-in number

for those who cannot attend.

Please call Jennifer Luthi (720.865.5432) or me (303.619.5179) if you have any questions.

Supplemental Field Sampling Plan Globeville Landing Outfall Project Soils Vasquez Boulevard/Interstate 70 Site, Operable Unit #2 Prepared for:

City and County of Denver Environmental Quality Division 200 West 14th Ave, Suite 310 Denver, Colorado 80204

Prepared by:

Engineering Management Support, Inc.

7220 W. Jefferson Ave., Suite 406

Lakewood, Colorado 80235

October 11, 2016

TABLE OF CONTENTS

1 INTRODUCTION ............................................................................................................ 1 2 SAMPLING OBJECTIVES, LOCATIONS, AND DEPTHS .......................................... 5

3 SAMPLING PROCEDURES AND ANALYSES............................................................ 6 3.1 Health and Safety ......................................................................................................... 6 3.2 Surveying of Boring Locations and Utility Clearance ................................................ 6 3.3 Borehole Drilling and Sampling .................................................................................. 6 3.4 Sample Preparation and Analyses ............................................................................... 7

4 DOCUMENTATION ....................................................................................................... 8 4.1 Field Notebook ............................................................................................................ 8 4.2 Borehole Log ............................................................................................................... 8 4.3 Chain-of-Custody Form ............................................................................................... 8

REFERENCES ......................................................................................................................... 9

LIST OF FIGURES

Figure 1: Proposed Shallow Soil Boring Locations

Figure 2: Proposed Deep Soil Boring Locations and Sampling Intervals

Supplemental

Field Sampling Plan

10-11-16 Page ii

LIST OF ACRONYMS

bgs Below ground surface

DOT Department of Transportation

EMSI Engineering Management Support, Inc.

EPA Environmental Protection Agency

FSP Field Sampling Plan

HASP Health and Safety Plan

PVC Poly-vinyl chloride

OU-2 Operable Unit #2

QAPP Quality Assurance Project Plan

RAWP Response Action Work Plan

SAP Sampling and Analysis Plan

SFSP Supplemental Field Sampling Plan

UNCC Utility Notification Center of Colorado

Supplemental

Field Sampling Plan

10-11-16 Page 1

1 INTRODUCTION

This Supplemental Field Sampling Plan (SFSP) was prepared on behalf of the City and

County of Denver (Respondent) to assess lead and arsenic concentrations in: 1) shallow

soils along a narrow tract of land within the limits of the Vasquez Boulevard/Interstate 70

(VB/I70) Superfund Site Operable Unit 2 (OU2) that was formerly owned by the Union

Pacific Railroad (UPRR); and 2) deeper soils immediately underlying the proposed lay-

back slopes of the open channel component of the Globeville Landing Outfall (GLO)

project that passes through the Globeville Landing Park.

With regards to the shallow soils, the Respondent recently acquired the UPRR property

with intentions to: a) integrate the southern portion of the parcel into the GLO project;

and b) integrate the northern portion of the parcel into the Globeville Landing Park. The

southern portion will be occupied by the open channel stormwater component of GLO

project. The northern portion will be used for recreational purposes as an extension of

the Globeville Landing Park. Accordingly, the purpose of the shallow-soil sampling

effort is to characterize lead and arsenic levels in the upper three feet of soil in the

northern portion of the property to determine if these near-surface soils may be suitable

for recreational use as is, or if some or all of the soils need to be replaced with “clean”

soil containing lead and arsenic below threshold levels. For purposes of this

investigation, threshold values consisting of 400 mg/Kg for lead (EPA Regional

Screening Level of a Residential receptor), and 70 mg/Kg for arsenic (OU-1 soil cleanup

level) are assumed to be applicable. As shown on Figure 1, the northern portion of

interest encompasses approximately 0.5 acres.

With regards to the deeper soils, the Respondent intends to assure that potential future

disturbance of soils within the upper 3 feet of lay-back slopes adjacent to the open-

channel portions of the GLO project in the Globeville Landing Park does not present a

potential future risk to worker or public health should those soils ever be disturbed.

Specifically, if lead or arsenic levels in these soils exceed the threshold values stated

above, the soils will be replaced with soils that do not exceed the threshold limits. Such

replacement will occur during GLO project construction. Note – as per the GLO design

documents, the upper 6 inches of finished-grade soil will be replaced with “clean” topsoil

that has been augmented for vegetative growth and does not exceed threshold values.

Consequently, the depth interval of interest to this investigation is between 0.5 feet and

3.0 feet below the finished grade of the lay-back slopes, as specified in the design

documents. As shown on Figure 2, the area of interest encompasses a large portion of the

Globeville Landing Park.

This SFSP presents the technical approach, methods, and procedures pertinent to

sampling shallow and deep soils. The Quality Assurance measures related to field and

laboratory activities conducted during the Design Investigation (see Quality Assurance

Project Plan (QAPP) (EMSI, 2015, Appendix C-2) apply to this investigation.

Figure 1

Globeville Landing Park

Proposed Shallow

Soil Boring Locations

Engineering Management Support, Inc.EMSI

M:\clients\EMSI\VB-I70\2016\Proposed-Shallow Soil Borings.dwg 4/14/2015

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Supplemental

Field Sampling Plan

10-11-16 Page 4

This SFSP is organized as follows.

Section 2 – Sampling Objectives, Locations, and Depths

Section 3 – Sampling Preparation and Analyses

Section 4 – Documentation

Supplemental

Field Sampling Plan

10-11-16 Page 5

2 SAMPLING OBJECTIVES, LOCATIONS, AND DEPTHS

The objective of both shallow and deep soil sampling programs is to determine

concentrations of lead and arsenic in 1) the current uppermost three feet of soil in the

northern portion of the former UPRR property, and 2) the interval between 0.5 feet and

3.0 feet below the finished grade of the open-channel lay-back slopes within the

Globeville Landing Park, as specified in the design documents.

Shallow soil sampling locations are shown on Figure 1. They are in the northern portion

of the former UPRR property that is not scheduled to be regraded or removed by the

GLO project. Ten soil borings are proposed, generally positioned on approximately 50-

feet centers, such that results from each boring will represent approximately 2,500 square

feet of near-surface soil. Three composite samples will be collected from each boring;

one from between 0 and 1 feet below ground surface (bgs); one from between 1 and 2

feet bgs; and one from between 2 and 3 feet bgs.

Deeper soil sampling locations are shown on Figure 2, along with their sampling intervals

measured from beneath the current ground surface. Twenty-six borings are proposed,

generally positioned on approximately 100-foot centers, such that each boring will

represent approximately 10,000 square feet of soil at the target elevation. One composite

sample will be collected from each boring that will represent the 2.5-foot soil interval

sampled.

Supplemental

Field Sampling Plan

10-11-16 Page 6

3 SAMPLING PROCEDURES AND ANALYSES

3.1 Health and Safety

Prior to performance of any field activities, all project personnel will have read,

understood, and agreed to comply with provisions of the Health and Safety Plan (HASP)

(EMSI, 2015, Appendix E) for the design investigation. Necessary safety equipment will

be readily available at the Site at all times during on-Site activities and will meet the

requirements of NIOSH/OSHA. Use, maintenance, and care of monitoring equipment

will be documented in the field logbook on a daily basis. All work will cease whenever

health and safety requirements are not followed or if environmental conditions deteriorate

to work cessation levels indicated in the HASP.

3.2 Surveying of Boring Locations and Utility Clearance

Prior to borehole drilling and sampling, the proposed boreholes will be located by a

licensed surveyor and representative of EMSI. Locations of proposed borings will be

marked with painted stakes. After locating the boreholes, the Utility Notification Center

of Colorado (UNCC) [call 811], the Denver Wastewater Management Division

https://www.denvergov.org/wastewatermanagement/WastewaterManagement/Engineerin

gandPermits/UndergroundUtility/tabid/440517/Default.aspx and the Metro Wastewater

Reclamation District

http://www.metrowastewater.com/know/PublicOutreach/Pages/utilitylocate.aspx

will be contacted to conduct a utility locates and to clear the borehole locations prior to

the start of drilling. If the location of a borehole is found to be within 10 feet of a utility

corridor, the borehole location will be moved to avoid potential impacts to the utility line.

Of particular concern is the location of the two existing large diameter sanitary sewer

lines that transverse beneath the proposed stormwater drainage structure alignment

(Figure 1).

3.3 Borehole Drilling and Sampling

Shallow boreholes will be advanced with a 3-ft long, 2-inch outside diameter Geoprobe™

core barrel equipped with a 3-ft long, 1.63-inch diameter internal plastic sampling sleeve.

As the core barrel/sampling sleeve assembly is advanced, soil core will be retained in the

sleeve. At completion of the core run, the coring assembly will be extracted and the

coring sleeve be removed from the core barrel. The sleeve will be opened and composite

samples from the three target intervals (0-1 ft, 1-2 ft, and 2-3 ft) will be collected.

Deeper boreholes will be advanced with a Geoprobe™ rig and similar sampling barrel

configuration, except the sampling barrel will be initially equipped with a drive point.

The coring assembly with drive point will advanced to the top of the sampling interval.

At that depth, the drive point will be extracted and the sampling sleeve will be inserted.

The coring assembly will then be advanced another 2.5 feet to fill the sampling sleeve.

https://www.denvergov.org/wastewatermanagement/WastewaterManagement/EngineeringandPermits/UndergroundUtility/tabid/440517/Default.aspx

https://www.denvergov.org/wastewatermanagement/WastewaterManagement/EngineeringandPermits/UndergroundUtility/tabid/440517/Default.aspx

http://www.metrowastewater.com/know/PublicOutreach/Pages/utilitylocate.aspx

Supplemental

Field Sampling Plan

10-11-16 Page 7

At completion of the core run, the coring assembly will be extracted, the coring sleeve

will be will be removed, and soil core from the entire run will composited into a single

sample.

At the ground surface, core samples will be logged using the ASTM Standard Practice for

Description and Identification of Soils (Visual-Manual Procedure) [ASTM D2488-06].

In addition, samples will be described using geologic interpretations and observations.

At completion of sample collection, each borehole will be abandoned by backfilling with

bentonite to the ground surface.

3.4 Sample Preparation and Analyses

Soil from each sampling interval will be composited in the field using a plastic mixing

bowl and plastic or stainless steel spatula. A sample of the composite (a minimum of 20

grams) will then be placed in a 4-ounce glass container, labeled, bubble-wrapped, and

placed in a cooler packed with ice.

A chain-of-custody (COC) record describing the contents of the cooler will be placed in a

sealed plastic bag and taped to the inside of the cooler lid. The lid will be closed,

securely taped, and sealed with a custody seal. The custody seals will be signed and

dated by the sampler.

Samples will be delivered to TestAmerica Denver where they will be analyzed for lead

and arsenic by Method SW-846 6010C. A turn-around time of 10 business days will be

requested.

Supplemental

Field Sampling Plan

10-11-16 Page 8

4 DOCUMENTATION

4.1 Field Notebook

Documentation of field activities will occur through the use of a field notebook that will

be in the possession of the field engineer during all field activities. The following

information will be contained in the field notebook.

Name of person(s) making entries

Date of field activities

Summary of activities conducted on the particular day

Identification of any visitors on site and the times of when they arrived and

departed

Description of site conditions (e.g. weather, surface conditions)

Deviations, if any, from planned activities or procedures set forth in this SFSP.

4.2 Borehole Log

The geologic and subsurface conditions in each core hole will be documented through the

use of the borehole log.

4.3 Chain-of-Custody Form

All soil samples will be collected under Chain-of-Custody procedures. As previously

stated, TestAmerica Denver will perform the analytical work on this project. A copy of

the TestAmerica Chain-of-Custody form will be retained in the project files.

Supplemental

Field Sampling Plan

10-11-16 Page 9

REFERENCES

Engineering Management Support, Inc. (EMSI), 2015. Final Removal Action Work

Plan, High Street Outfall and 40th

Avenue Storm Sewer System, VB/I70 Site - OU2,

prepared for City and County of Denver. June 19, 2015.

C:\VBI-70 RI FS\High Street and 40th Storm Sewer\EPA Update Meetings\EPA Meeting Agenda 10_26_16.docPage 1

Status Meeting

VB/I-70 OU2 Removal Action (aka GLO Project) 10/26/2016 @ 09:00 am @ Webb Building

Call in number – 1-866-299-9141

Participant Passcode – 15028048#

------ Agenda Topics ------

Welcome and Review Meeting Agenda

One-on-One meeting with Community Activists update (10/25)

Updates to Community Outreach efforts

Update related to environmental sampling borings

Construction schedule

October 10, 2016 Revised October 19, 2016 Merrick & Company 2840 West 26th Street, Unit B225 Denver, Colorado 80211 Attention: Michael R. Galuzzi, P.E. Jeanne M. Boyle, P.E., C.F.M. Subject: Lead and Arsenic Soil Sample Results Globeville Landing Park Outfall, Phase 1B Northeast of 38th Street and Arkins Court

Denver, Colorado Project No. DN44,666.004-205

This letter was prepared by CTL | Thompson, Inc. (CTL) for Merrick & Company and presents the results of the soil sampling conducted as part of the Globeville Landing Park Outfall project in Denver, Colorado. Introduction

The purpose of our investigation was to evaluate shallow soil quality in the

tract of land in between Globeville Landing Park and the Denver Coliseum parking lot that was formerly owned by Union Pacific Railroad (UPRR). This was conducted concurrently with our geotechnical investigation and focused on the presence of Lead and Arsenic in five selected borings. We also observed for potential asbestos containing materials in the borings completed during the geotechnical investigation.

Field Investigation

CTL mobilized to the site on August 29 and 30, 2016 with Odell Drilling for

the installation of 11 soil borings. The borings were installed using a truck-mounted solid and hollow stem auger. Our Mr. Trevor Branch and Mr. Trevor Truett (Asbes-tos Building Inspector No. 17816) provided observation of test holes installed in the eastern portion of Globeville Landing Park and the southern portion of the UPRR parcel (TH-55 through TH-60) for potential asbestos containing materials. Due to data obtained from previous environmental studies, no soil sampling was conduct-ed within these borings. On August 30, 2016 soil samples were collected via dry-core sampler from the first five feet of borings TH-61 through TH-65. Soil material was collected from the top five-foot interval and placed in a stainless bowl and composited prior to being placed in laboratory provided glassware, and then into a cooler on ice. One soil sample was submitted for each of the five borings in the

MERRICK & COMPANY 2

GLOBEVILLE LANDING PARK OUTFALL, PHASE 1B CTL|T PROJECT NO. DN44,666.004-205 S:\PROJECTS\44600\DN44666.004\205\3. Letters\L1\DN44666.004-205-L1-Revised.doc

northern portion of the former UPRR parcel. The samples were submitted to Origins Laboratory for analysis of Lead and Arsenic by EPA Method 3050B/6010C.

Three suspect building materials were observed and submitted to EMSL

Analytical, Inc. for analysis of bulk materials via EPA 600/R-93/116 Method using Polarized Light Microscopy. Two samples were collected from TH-55 and one sample from TH-60 were submitted for analysis for detection of asbestos fibers.

Field Screening

We used a Mini-Rae photo ionization detector (PID), and our visual and olfactory observations to field-screen soil samples obtained during drilling. The PID was calibrated to isobutylene. During field-screening, samples were placed in resealable plastic bags for testing with the PID. The bagged samples were warmed and the vapor headspace inside the bags was then field-screened. The PID de-tects total volatile organic compounds (VOCs) with the ionization potential of less than or equal to 10.6 eV. The PID does not provide a direct measure of com-pounds in the samples and it does not identify specific compounds, therefore, the results of field-screening are identified in units of parts per million volume (in air) (ppmv).

No readings were detected above 1 ppmv by the PID at any of the sampled

intervals; we believe these readings to be within background levels. We did not observe obvious visual or olfactory indicators of contamination in the soil samples or cuttings from the borings with the exception of a dark fill layer encountered intermittently in the first five feet of TH-61 through TH-65. Environmental protocol was used by CTL and its subcontractors during drilling and sampling. Gloves and plastic bags were used by CTL to obtain and screen subsurface soils. Logs of Exploratory Borings are included in Attachment A.

Laboratory Results and Discussion

Based on laboratory analytical results, concentrations of Lead and Arsenic were detected in all five samples. Tables I presents a summary of the laboratory analytical results. A complete copy of the laboratory results is presented in Attach-ment B.

TABLE I Summary of Soil Sample Results - Metals

Analyte TH-61 0-5’ TH-62 0-5’ TH-63 0-5’ TH-64 0-5’ TH-65 0-5’ EPA RSL - R EPA RSL - I

Arsenic 48.3 8.62 20 18.2 22.8 0.68 3.0

Lead 466 101 145 284 459 400 800

All concentrations are in milligrams per kilogram (mg/kg) ND = Not detected above laboratory detection limits BOLD = Exceeds EPA Regional Screening Level – EPA RSL - R (Residential) and EPA RSL - I (Industrial)

MERRICK & COMPANY 3

GLOBEVILLE LANDING PARK OUTFALL, PHASE 1B CTL|T PROJECT NO. DN44,666.004-205 S:\PROJECTS\44600\DN44666.004\205\3. Letters\L1\DN44666.004-205-L1-Revised.doc

The five samples exceeded the residential EPA RSL for Arsenic. Arsenic is naturally occurring in some geologic environments in Colorado due to weathering and erosion of bedrock and soil, including highly mineralized areas that are mined for metal ores. The average concentration for US EPA Region 8 Urban Mixed Use is 6-19 mg/kg and therefore we consider the concentrations of TH-62 and TH-64 to be within background levels; however, the Arsenic concentrations in TH-61, TH-63 and TH-65 exceed the background limits.

Lead exceeded the residential EPA RSL in TH-61 and TH-65 and are below

the industrial EPA RSL. The soil sample locations are shown on Figure 1 and the metals concentrations are shown on Figure 2.

The suspect building materials collected from TH-55 and TH-60 were non-

detect for asbestos. The asbestos laboratory results are included in Attachment B. Conclusions

Based on the results of field screening and limited sampling and evaluation

at the site, we believe some of the soil within the shallow fill material contains concentrations of Arsenic higher than those generally encountered in native Colo-rado soils. Lead concentrations were above the residential EPA RSL but below the industrial EPA RSL within TH-61 and TH-65. If this soil is excavated during future development activities, workers should be informed and properly protected under a Materials Management Plan or other similar type of plan.

Limitations

This letter was prepared for the use of Merrick & Company and Urban

Drainage and Flood Control in evaluating shallow soil quality. Our sampling and analytical plan was designed using previously obtained environmental background information and our judgment for the performance of a limited subsurface investi-gation based the area of proposed work. Chemical analyses were performed by Origins Laboratory in Denver, Colorado for specific parameters during this investi-gation. The accuracy and reliability of environmental studies are a reflection of the number and type of samples taken and extent of the analyses conducted by CTL. This investigation does not result in any guarantee that the site is free and clear of hazardous materials other than those that may be indicated by CTL in this report. We believe our environmental site evaluation was conducted in a manner consistent with that level of care and skill ordinarily exercised by members of the profession currently practicing in the locality of the project. No warranty, express or implied, is made by CTL.

DN 46,666.004-205 GLOBEVILL/HIGH/40TH STREETS OUTFALL

FIGURE 1 – BORING LOCATION MAP

DN 44,666.004-205 GLOBEVILL/HIGH/40TH STREETS OUTFALL FIGURE 2 – METALS CONCENTRATIONS

Note: All concentrations in milligrams per kilogram (mg/kg)

Lead Arsenic

466 48.6

Lead Arsenic

101 8.62

Lead Arsenic

145 20

Lead Arsenic

284 18.2

Lead Arsenic

459 22.8

MERRICK & COMPANY GLOBEVILLE LANDING PARK OUTFALL, PHASE 1B CTL|T PROJECT NO. DN44,666.004-205 S:\PROJECTS\44600\DN44666.004\205\3. Letters\L1\DN44666.004-205-L1-Revised.doc

ATTACHMENT A

SUMMARY LOGS OF EXPLORATORY BORINGS

GLOBEVILLE LANDING PARK OUTFALL, PHASE 1BMERRICK AND COMPANY

1.

LEGEND:

NOTES:

2. BORING LOCATIONS WERE DETERMINED USING PLANS PROVIDED AND REFERENCINGSITE FEATURES. ELEVATIONS WERE SURVEYED AND PROVIDED BY MERRICK.

SUMMARY LOGS OF EXPLORATORY BORINGS

0

5

10

15

20

25

30

35

40

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20

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TH-61El. 5173.7

TH-62El. 5176.1

TH-63El. 5173.3

TH-64El. 5171.3

TH-65El. 5166.6

CONTINUOUS CORE BARREL SAMPLER.

THE BORINGS WERE DRILLED ON AUGUST 29, 2016 USING 4-INCH DIAMETER CONTINUOUS-FLIGHTAUGER AND A TRUCK-MOUNTED CME-45 DRILL RIG.

3. THESE LOGS ARE SUBJECT TO THE EXPLANATIONS, LIMITATIONS AND CONCLUSIONSCONTAINED IN THIS REPORT.

ATTACHMENT A

FILL, SAND, SILTY TO CLAYEY WITH SOME SANDY CLAY, GRAVELLY, DEBRIS (ASPHALT, CONCRETEWOOD, GLASS, METAL, BRICKS, OTHER), SLIGHTLY MOIST TO WET, BROWN, BLACK, WHITE, GRAY,RED, DARK BROWN, TAN.

PROJECT NO. DN44,666.004-205

MERRICK & COMPANY GLOBEVILLE LANDING PARK OUTFALL, PHASE 1B CTL|T PROJECT NO. DN44,666.004-205 S:\PROJECTS\44600\DN44666.004\205\3. Letters\L1\DN44666.004-205-L1-Revised.doc

ATTACHMENT B

LABORATORY DATA

EMSL Analytical, Inc.1010 Yuma Street Denver, CO 80204

Tel/Fax: (303) 740-5700 / (303) 741-1400

http://www.EMSL.com / [email protected]

221606480EMSL Order:

Customer ID: CTLT34

Customer PO:

Project ID:

Attention: Phone:Trevor Truett (303) 356-6808

Fax:CTL Thompson

Received Date:1971 West 12th Avenue 09/12/2016 1:20 PM

Analysis Date:Denver, CO 80204 09/14/2016

Collected Date: 08/29/2016

Project: DN44666.004

Test Report: Asbestos Analysis of Bulk Materials via EPA 600/R-93/116 Method using Polarized

Light Microscopy

Sample Description Appearance % Fibrous % Non-Fibrous

Non-Asbestos Asbestos

% Type

TH-SS-SH1-01

221606480-0001

None DetectedNon-fibrous (Other)50%Synthetic50%Gray

Fibrous

Homogeneous

Fabric

TH-SS-RM1-01

221606480-0002

None DetectedNon-fibrous (Other)85%Cellulose15%Black

Fibrous

Homogeneous

Roofing Material

TH-60-MORT1-01

221606480-0003

None DetectedNon-fibrous (Other)100%Gray/White

Non-Fibrous

Homogeneous

Mortar

Analyst(s)

Abigail Crock (3) Brendon Rawlings, Laboratory Manager

or Other Approved Signatory

EMSL maintains liability limited to cost of analysis . This report relates only to the samples reported and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no

responsibility for sample collection activities or analytical method limitations. Interpretation and use of test results are the responsibility of the client. This report must not be used by the client to claim

product certification, approval, or endorsement by NVLAP, NIST or any agency of the federal government . Non-friable organically bound materials present a problem matrix and therefore EMSL

recommends gravimetric reduction prior to analysis. Samples received in good condition unless otherwise noted. Estimated accuracy, precision and uncertainty data available upon request. Unless

requested by the client, building materials manufactured with multiple layers (i.e. linoleum, wallboard, etc.) are reported as a single sample. Reporting limit is 1%

Samples analyzed by EMSL Analytical, Inc. Denver, CO NVLAP Lab Code 200828-0

Initial report from: 09/14/2016 15:08:57

Page 1 of 1ASB_PLM_0008 - 1.71 Printed: 9/14/2016 1:08 PM

CTL Thompson, Inc.

Trevor Branch

1971 West 12th Avenue

Denver CO 80204

Project Name - Globeville Project Number - DN44666.004-205

Attached are your analytical results for Globeville received by Origins Laboratory, Inc. August 31, 2016. This project is associated

with Origins project number X608348-01.

The analytical results in the following report were analyzed under the guidelines of EPA Methods. These methods are identified as

follows; "SW" are defined in SW-846, "EPA" are defined in 40CFR part 136 and "SM" are defined in the most current revision of

Standard Methods For the Examination of Water and Wastewater.

The analytical results apply specifically to the samples and analyses specified per the attached Chain of Custody. As such, this

report shall not be reproduced except in full, without the written approval of Origin's laboratory.

Unless otherwise noted, the analytical results for all soil samples are reported on a wet weight basis. All analytical analyses were

performed under NELAP guidelines unless noted by a data qualifier.

Any holding time exceedances, deviations from the method specifications or deviations from Origins Laboratory's Standard

Operating Procedures are outlined in the case narrative.

Thank you for selecting Origins for your analytical needs. Please contact us with any questions concerning this report, or if we can

help with anything at all.

Origins Laboratory, Inc.

303.433.1322

[email protected]

September 07, 2016

Trevor Branch


CTL Thompson, Inc.

Project: Globeville

Project Number: DN44666.004-205

Denver CO 80204

Sample ID Laboratory ID Matrix

CROSS REFERENCE REPORT

Date ReceivedDate Sampled

TH-61 0-5' X608348-01 08/31/2016 12:39Soil August 30, 2016 10:30

TH-62 0-5' X608348-02 08/31/2016 12:39Soil August 30, 2016 10:50

TH-63 0-5' X608348-03 08/31/2016 12:39Soil August 30, 2016 11:45

TH-64 0-5' X608348-04 08/31/2016 12:39Soil August 30, 2016 12:30

TH-65 0-5' X608348-05 08/31/2016 12:39Soil August 30, 2016 13:00

Jen Pellegrini For Noelle Doyle Mathis, President


The results in this report apply to the samples analyzed in

accordance with the chain of custody document. This

analytical report must be reproduced in its entirety.

Page 2 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204

COC Goes Here






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Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204

COC Goes Here






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Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204

ResultAnalyte Limit Batch

Reporting

Prepared Analyzed Notes DilutionUnits

X608348-01 (Soil)

GEL Laboratories, LLC

TH-61 0-5'

8/30/2016 10:30:00AM

Total Metals by SW846 3050B/6010C

1595321 09/01/2016 09/02/2016mg/kg dry 13.16Arsenic 48.3

" " "" "1.05Lead 466






Page 5 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204


Reporting


X608348-02 (Soil)


TH-62 0-5'

8/30/2016 10:50:00AM


1595321 09/01/2016 09/02/2016mg/kg dry 13.11Arsenic 8.62

" " "" "1.04Lead 101






Page 6 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204


Reporting


X608348-03 (Soil)


TH-63 0-5'

8/30/2016 11:45:00AM


1595321 09/01/2016 09/02/2016mg/kg dry 13.06Arsenic 20.0

" " "" "1.02Lead 145






Page 7 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204


Reporting


X608348-04 (Soil)


TH-64 0-5'

8/30/2016 12:30:00PM


1595321 09/01/2016 09/02/2016mg/kg dry 13.46Arsenic 18.2

" " "" "1.15Lead 284






Page 8 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204


Reporting


X608348-05 (Soil)


TH-65 0-5'

8/30/2016 1:00:00PM


1595321 09/01/2016 09/02/2016mg/kg dry 13.30Arsenic 22.8

" " "" "1.10Lead 459






Page 9 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204

Result LimitReporting

Units LevelSpike

ResultSource

%REC%RECLimits RPD

RPDLimit Notes Analyte

Total Metals by SW846 3050B/6010C - Quality Control


Batch 1595321 - SW846 3050B

BLANK (1203619065-BLK) Prepared: 09/01/2016 Analyzed: 09/02/2016

Lead mg/kgND 0.928 U-

Arsenic "ND 2.78 U-

LCS (1203619066-BKS) Prepared: 09/01/2016 Analyzed: 09/02/2016

Lead mg/kg44.3 0.965 48.3 80-12091.8

Arsenic "46.1 2.90 48.3 80-12095.6

DUP (1203619067 D) Prepared: 09/01/2016 Analyzed: 09/02/2016Source: X608348-01

Lead mg/kg dry514 1.02 466 200-20 9.87

Arsenic "68.2 3.06 48.3 200-20 34.2

MS (1203619068 S) Prepared: 09/01/2016 Analyzed: 09/02/2016Source: X608348-01

Lead mg/kg dry509 1.08 54.1 466 75-12580

Arsenic "104 3.25 54.1 48.3 75-125103






Page 10 of 11

Trevor Branch


CTL Thompson, Inc.

Project: Globeville


Denver CO 80204

Notes and Definitions

U Result not detected above the detection limit

Relative Percent DifferenceRPD

Analyte NOT DETECTED at or above the reporting limitND

All soil results are reported at a wet weight basis.






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