Appendix_A-3_Soil_Gas_Assessment_Report.pdf

Soil Gas Assessment Report

WELCH ELEMENTARY/DOVER MIDDLE SCHOOL REPLACEMENT

DOVER AIR FORCE BASE, DOVER, DE

August 31, 2016

Revised November 17, 2016

Terracon Project No. 7316P090

Prepared for:

Zyscovich Architects, Inc.

Miami, Florida

Prepared by:

Terracon Consultants, Inc.

Columbia, South Carolina mmcguinn Typewritten Text

RFP W912BU-17-R-0032

E5ECEKJP

Typewritten Text

APPENDIX A-3

E5ECEKJP

Typewritten Text

SOIL GAS ASSESSMENT REPORT

Terracon Consultants, Inc . 521 Clemson Road Columbia, South Carolina 29229

P (803) 741 9000 F (803) 741 9900 terracon.com

August 31, 2016

Revised November 17, 2016

Zyscovich Architects, Inc.

100 North Biscayne Boulevard, 27th floor

Miami, FL 33132

Attn: Mr. Michael McGuinn, AIA

P: (305) 372-5222

E: mmcguinn@zyscovich.com

Re: Soil Gas Assessment Report

Welch Elementary/Dover Middle School Replacement

Dover Air Force Base, Dover, DE

Terracon Project No. 7316P090

Dear Mr. McGuinn:

Terracon Consultants, Inc. (Terracon) is pleased to submit our report of soil gas assessment activities completed at the site referenced above. The report presents data from recent field activities that included the collection of soil gas samples for chemical analysis. Terracon conducted this assessment in accordance with proposal J6155083 dated March 22, 2016.

Terracon appreciates the opportunity to provide professional environmental services for

Zyscovich Architects, Inc. Should you have any questions or require additional information, please do not hesitate to contact our office.

Sincerely, Terracon Consultants, Inc.

Christopher Bartley Charles R. Clymer, Jr. P.G.

Project Manager Senior Principal

Attachment

TABLE OF CONTENTS

ii

1.0 INTRODUCTION

1.1 Standard of Care

1.2 Additional Scope Limitations

1.3 Reliance

2.0 CONCEPTUAL SITE MODEL

2.1 Site Physical Description

2.2 Surrounding Properties Development

2.3 Potential Sources

2.4 Potential Pathways Evaluation

3.0 SAMPLE COLLECTION

3.1 Soil Gas Sampling

3.2 Significant Deviations

4.0 PROJECT DATA

4.1 Soil Gas Data

4.2 Updates to the CSM

5.0 CONCLUSIONS

6.0 RECOMMENDATIONS

APPENDIX A – FIGURES

Figure 1 – Site Location Map

Figure 2 – Soil Gas Sample Location Plan

Figure 3-1 – Area 6 Plume and Monitoring Well Locations (from US Dept Of Air Force, Monitoring Report for Area 6, June 2016)

APPENDIX B – TABLES

Table 1 – Soil Gas Data Laboratory VOC Detections (Method TO-15)

APPENDIX C – LABORATORY ANALYTICAL REPORT AND CHAIN OF CUSTODY

Responsive ■ Resourceful ■ Reliable

SOIL GAS ASSESSMENT REPORT

WELCH ELEMENTARY/DOVER MIDDLE SCHOOL REPLACEMENT

DOVER AIR FORCE BASE, DOVER, DE

TERRACON PROJECT NO. 7316P090

AUGUST 31, 2016

1.0 INTRODUCTION

The site is an approximate seven-acre area within the Dover Air Force Base (DAFB) Military

Housing. The proposed school is a two-story building with a total footprint of approximately

85,000 square feet, located east-southeast of the existing Welch Elementary / Dover Middle

School building. The proposed school replacement site is improved with an athletic field (see

Figure 1 in Appendix A).

We understand that land use controls are in effect for areas northeast of the proposed school, related to three old landfill sites and a former WWTP. A solvent contaminant groundwater plume called “Area 6” has been reported to be sourced upgradient (north-northeast) of the proposed school site, and ground water remediation and routine ground water monitoring is being performed by the DAFB in accordance with State and Federal requirements.

A copy of the Area 6 Monitoring Report prepared by Oak Ridge National Laboratory and AECOM for the US Department of the Air Force dated June 2016 was provided to Terracon by Zyscovich

Architects, Inc. According to the report, the site is located within “Area 6”, a multi-source, comingled ground water contaminant plume primarily impacted with chlorinated volatile organic compounds (CVOCs), benzene, and lindane. The plume is approximately 4,000 feet long by 2,400 feet wide, and extends from the AFB across US Highway 1 below the military housing and towards a golf course and the St. Jones River (see Figure 3-1 in Appendix A). Contaminants are generally shallow near the source of the plume and move deeper as they migrate downgradient. In general, the report indicates that total contaminant concentrations within the ground water plume are decreasing

The objective of this soil gas assessment was to evaluate the site for presence/absence of shallow soil gas concentrations related to the Area 6 plume contaminants and to assess the need for a vapor mitigation system (engineering control) at the new school site based upon potential vapor intrusion concerns.

1.1 Standard of Care

Terracon’s services were performed in a manner consistent with generally accepted practices of the profession undertaken in similar studies in the same geographical area during the same time.

Terracon makes no warranties, either express or implied, regarding the findings, conclusions, or

Welch Elementary/Dover Middle School Replacement ■ Dover, Delaware

August 31, 2016/ Revised Nov. 17, 2016 ■ Terracon Project No. 7316P090

Responsive ■ Resourceful ■ Reliable 2 recommendations. Please note that Terracon does not warrant the work of laboratories, regulatory agencies, or other third parties supplying information used in the preparation of the report. These assessment services were performed in accordance with the scope of work agreed with you, our client, as reflected in our proposal and were not restricted by ASTM E1903-11.

1.2 Additional Scope Limitations

Findings, conclusions, and recommendations resulting from these services are based upon information derived from the on-site activities and other services performed under this scope of work; such information is subject to change over time. Certain indicators of the presence of hazardous substances, petroleum products, or other constituents may have been latent, inaccessible, unobservable, nondetectable, or not present during these services. We cannot represent that the site contains no hazardous substances, toxic materials, petroleum products, or other latent conditions beyond those identified during this assessment. Subsurface conditions may vary from those encountered at specific borings or wells or during other surveys, tests, assessments, investigations, or exploratory services. The data interpretations, findings, and our recommendations are based solely upon data obtained at the time and within the scope of these services.

1.3 Reliance

This report has been prepared for the exclusive use of the Department of the Army, US Army

Corps of Engineers Norfolk and Philadelphia Districts, Dover Air Force Base and Zyscovich

Architects, Inc., its successors and assigns, and any authorization for use or reliance by any other party (except a governmental entity having jurisdiction over the site) is prohibited without the express written authorization of Zyscovich Architects, Inc., and Terracon. Any unauthorized distribution or reuse is at Zyscovich Architects, Inc.’s sole risk.

2.0 CONCEPTUAL SITE MODEL

Terracon has developed the following Conceptual Site Model (CSM). The CSM is a description of the site and site features pertinent to identifying possible site contaminants, determining how those contaminants may behave relative to site conditions, and understanding potential receptor pathways.

2.1 Site Physical Description

Responsive ■ Resourceful ■ Reliable 3

Physical Setting Information Source

Topography (Refer to Appendix A for an excerpt of the Topographic Map)

Site Elevation Approximately 10 feet USGS Topographic

Maps, Dover DE, 1993;

Little Creek DE, 1993;

Wyoming, DE, 1993; &

Frederica DE, 1993

Surface Runoff/

Topographic Gradient Very gently sloping towards the south

Closest Surface Water St. Jones River is located approximately 400 feet west of the site

Soil Characteristics

Soil Type Area not covered by soil survey Kent County, DE

USDA-NRCS Web Soil

Survey 2016 Description n/a

Geology/Hydrogeology

Formation Scott’s Corner Formation (upper Pleistocene)

Geologic Map of Kent

County, Delaware, Kelvin W. Ramsey, 2007; issued by the

Delaware Geolgical

Survey

Description

Heterogeneous units of light-gray to brown to light-yellowish-brown, coarse to fine sand, gravelly silt, and pebble gravel. Sands are quartzose with rare discontinuous beds of organic-rich clayey silt to fine sandy silt.

Laminae of opaque heavy minerals are common. The unit underlies a terrace parallel to the present Delaware River that has elevations less than 25 feet. Overall thickness of the unit rarely exceeds 20 feet.

Estimated Depth to First

Occurrence of

Groundwater

Approximately 3.7 to 5.3 feet below ground surface

Area 6 Monitoring

Report (March 2016

Event), Dover Air Force

Base, Delaware, dated

June 2016 by Oak

Ridge National

Laboratory & AECOM

Hydrogeologic Gradient South As Above

Responsive ■ Resourceful ■ Reliable 4

2.2 Surrounding Properties Development

The site is located within the military housing community for the Dover Air Force Base. The site and northern, eastern, and western adjoining properties are associated with the current school.

The southern adjoining properties are residences (see Appendix A, Figure 2).

2.3 Potential Sources

The site is located within “Area 6”, a multi-source, comingled ground water contaminant plume primarily impacted with chlorinated solvents, benzene, and lindane. The Area 6 source areas are located over 5,000 feet to the north-northeast of the site (see Figure 3-1 in Appendix A).

2.4 Potential Pathways Evaluation

Potential Pathways for Contaminant Transport

No current contaminant transport pathways have been identified aside from ground water flow and rainfall infiltration.

Potential Exposure Pathways

This assessment focused on the evaluation of the soil gas to indoor air pathway. Findings are discussed in subsequent sections.

3.0 SAMPLE COLLECTION

The sample collection approach outlined below describes data collection activities set forth in

Terracon Proposal J6155083 dated March 22, 2016. Field activities were conducted August 1 through 3, 2016.

3.1 Soil Gas Sampling

To accomplish the project goals, soil gas testing was required. Sample locations were gridded within the proposed structure based on the orientation of the ground water contaminant plume with respect to the site development. Sample locations are shown on Figure 2 in Appendix A.

Terracon collected and analyzed 19 shallow soil gas samples at locations as shown on Figure 2.

Soil gas samples were collected via soil gas implants, installed to a depth of 3 feet below ground surface (bgs). Soils gas sampling was completed using SUMMA canisters.

Responsive ■ Resourceful ■ Reliable 5

Each sample point was advanced with a decontaminated stainless-steel hand auger to a depth of 3 below ground surface and converted to a soil gas sampling point installed six inches above the bottom of the boring. Each stainless steel point is configured with lateral ports for gas inlet and a barb fitting on the top to connect to small bore (0.25 inches O.D.) nylon sample tubing. The ports are protected from fines by a Teflon disk and stainless steel screen to prevent clogging. A sand filter pack was placed within the annulus opposite the screen to a height of six inches above the screen point. Granular bentonite was placed in the borehole annulus above the sand pack to the land surface and hydrated. The soil gas implants were capped and allowed to equilibrate overnight.

Soil gas samples were collected from each point into 1-liter (L) SUMMA canisters supplied by the laboratory. Each canister was filled using a dedicated, 30-minute (min), flow controller set to a sample rate less than or equal to ~33 milliliters (mL) per min (30 mL/min x 30 min = 1 L sample volume). An “in line” vacuum gauge was installed at the sample controller to verify initial vacuum levels within the canister and as an indicator that final pressure equalization (non-zero) had been reached (i.e. sampling is complete).

Once sampling was complete, all canister samples were packaged for shipment to the laboratory and analyzed for VOCs per EPA Method TO-15.

3.2 Significant Deviations

No significant deviations were encountered during sample collection.

4.0 PROJECT DATA

4.1 Soil Gas Data

Laboratory analytical soil gas data detections are presented in Appendix B, Table 1. Twenty-two

VOC analytes were reported in the soil gas samples; however, no analyte was reported above the Delaware Department of Natural Resources and Environmental Control, Site Investigation and Restoration Section (DE DNREC-SIRS), Screening Levels (SLs) for Sub-Slab and Exterior

Soil Gas. The pattern of detected analytes, and more specifically the detections of CVOCs and benzene (the primary VOCs associated with the ground water contaminant plume), are relatively uniform in soil gas and differs in type and magnitude from the ambient air blank. Additionally, the results from the on-site upgradient samples, SG-1 and SG-2, do not differ significantly from the downgradient sample results. These relationships indicate that ground water is not likely a significant contributor to VOC detections in soil gas. During boring installation, field staff noted the presence of trash in several borings (aluminum cans, wire, Styrofoam, etc.). These materials

Responsive ■ Resourceful ■ Reliable 6 suggest that the upper few feet of soils at the site may be fill, sourced from off-site. The trace chemical signal of analytes may be sourced from this fill material.

The highest VOC concentrations detected were of acetone and methyl-ethyl ketone (butanone).

These compounds were below DE DNREC-SIRS SLs, and are traditionally considered “laboratory artifacts”. Terracon noted that the detections of these compounds in the ambient blank were an order of magnitude below the soil gas detections; additionally, these compounds were not detected in the laboratory method blank, nor do they appear as a constituent of the upgradient ground water contaminant plume. As such, the occurrence of these compounds in the samples appears to be site-derived; in Terracon’s opinion, the acetone and methyl-ethyl ketone detections are likely sourced from the abundant decaying organic matter (grass cuttings) present at the athletic field.

4.2 Updates to the CSM

No new site conditions, potential sources areas, or potential receptors were identified during the course of this assessment. No updates to the CSM have been identified aside from the data presented in this report.

5.0 CONCLUSIONS

Based on the scope of services described in this report and subject to the limitations described herein, Terracon concludes the following:

Analysis of soil gas samples from nineteen locations indicated twenty-two VOC analytes reported in soil gas at the site. The VOCs concentrations were not present at levels above DE DNREC-SIRS RLs. The pattern of detected analytes, and more specifically the detections of CVOCs and benzene (the primary VOCs associated with the ground water contaminant plume), are relatively uniform in soil gas and differs in type and magnitude from the ambient air blank. Additionally, the results from the upgradient samples, SG-1 and SG-2, do not differ significantly from the downgradient sample results. These relationships indicate that ground water is not likely a significant contributor to VOC detections in soil gas. In Terracon’s opinion, the detections are likely from the apparent fill and/or biogenic sources present at the site. Based on these data, there does not currently appear to be an elevated risk for vapor intrusion at the site.

Responsive ■ Resourceful ■ Reliable 7

6.0 RECOMMENDATIONS

Based upon the results of this Soil Gas Assessment, Terracon does not recommend further evaluation of soil gas or integration of an engineering control, such as a subslab vapor mitigation system, below the proposed structure on this site.

APPENDIX A – FIGURES

Figure 1 – Site Location Map

Figure 2 – Soil Gas Sample Location Plan

Figure 3-1 – Area 6 Plume and and Monitoring Well Locations

(from US Dept Of Air Force, Monitoring Report for Area 6, June 2016)

TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY

QUADRANGLES INCLUDE: DOVER, DE (1/1/1993), LITTLE CREEK, DE (1/1/1993), WYOMING, DE (1/1/1993) and FREDERICA, DE (1/1/1993).

SITE LOCATION MAP

Welch Elementary/Dover Middle School Replacement

Dover Airforce Base Dover, Delware

521 Clemson Rd

Columbia, SC 29229-4307

7316P090

PTK

CBB

CRC

AS SHOWN

Fig 1

July 2016

Scale:

Figure Project Manager:

Drawn by:

Checked by:

Approved by:

Project No.

File Name:

Date:

CBB

APPROXIMATE

SITE LOCATION

PROPOSED BUILDING FOOTPRINT

75' GRID

SG-1

SG-2

SG-3

SG-4

SG-5

SG-8

SG-9

SG-10

SG-6

SG-11

SG-7

SG-12

SG-18

SG-17

SG-16

SG-14

SG-13

SG-15

SG-19

Project Mngr:

Approved By:

Checked By:

Drawn By:

Project No.

Scale:

Date:

File No.

Consulting Engineers and Scientists

521 CLEMSON ROAD COLUMBIA, SC 29229

FAX. (803) 741-9900PH. (803) 741-9000

FigureCBB

PTK

CBB

CRC

7316P090

AS SHOWN

7316P090

AUGUST 2016

SOIL GAS SAMPLE LOCATION PLAN

WELCH ELEMENTARY / DOVER MIDDLE SCHOOL REPLACEMENT

DOVER AIR FORCE BASE

DOVER, DELWARE

DIAGRAM IS FOR GENERAL LOCATION ONLY, AND

IS NOT INTENDED FOR CONSTRUCTION PURPOSES

SCALE IN FEET

0100 25 10050

EXPLANATION

SOIL GAS SAMPLE LOCATION

3rd Street

Chevron Avenue

Ram p R oad

N. Ramp Rout 1

N.

R am p R ou te

6th Street

7th St ree t

Haze lnut Drive

Yew Stree t

Atlan tic

St ree t

Integrity Avenue

Macadamia Way

Sourwood Street

Avocado Avenue

Wisteria Court

Ze lko va Co urt

Magnolia Court

Red Bud Court

Rose wood

Drive

5th Street

Raintree Drive

Mobility Way

Green Way

Evreux Street

Mesquite Court

Circle Drive

Cent er R oad

Co ffe e C irc le

W. Hawthorne D rive

Retreat Drive

Ash Court

Cashew Court

Buttonwood Court

Sumner S tree t

High St ree t

4th Street

Hemlock Court

Ho rn be am

C ou rt

Catalpa Court

Sycamore Court

Paw Paw Place

Pine C abin Road

Cypress Street

Walnut Street

Co co nu t C ou rt

La rch

Co urt

Key Lim e C our t

Sp ruc e C ou rt

Bamboo Court

Birc h C ou rt

E. Circle Drive

Myrtle Street

S. Ram p Route 1

Brazil Nut Way

Pistachio Place

Main Gate Way

Gree n W ay Stre et

Lebanon Road

2035-1

2030-4

40094000

2055-1

2025-3

2052-4

2051-4

2029-4

2002-2

2028-1

SS-1

2029-3

2053-2

2044-3

2029-1

1010619

2043-2

2010-1

2037-3

2013-1

2050-1

2049-1

2036-4

2011-2

2042-3

2046-2

2032-3

2038-1

99999

2042-1

2000-1

2037-1

2048-2

2047-2

2015-2

2049-2

2041-4

2009-1

2051-2

2055-2

2012-1

2008-3

2031-1

2033-1

2027-1

2007-3

2059-3

2003-2

2057-1

2058-2

2041-2

2012-2

2013-2

2015-1

2040-3

2025-1

2034-3

2005-4

7005 8008

2002-1

2035-4

2014-1

2009-3

2031-2

2003-1

3010 2026-4

2039-2

2035-3

2052-3

2036-3

2030-3

2060-3

2049-4

2056-4

607 8007

2025-4

2047-1

2055-3

2010-43025

2054-2

2040-1

2045-3

2026-3

2057-4

2050-2

2033-2

60241006

2034-1

2048-1

2004-1

2033-4

2028-2

2006-4

2000-2

2056-2

2032-1

2029-2

2008-1

2044-1

2045-1

2006-2

2007-1

2054-4

2058-4

2041-1

2038-4

2027-3

2036-1

2038-2

2030-1

3022 2043-1

2026-1

2053-1

2005-1

2054-1

2046-4

2001-1

@ A @ A

@ A

@ A @ A @ A @ A @ A

@ A

@ A @ A

@ A @ A

@ A

@ A

@ A

@ A @ A

@ A

@ A

@ A

@ A@ A

@ A@ A

@ A @ A

@ A @ A

@ A @ A

@ A @ A

@ A@ A

@ A

@ A

@ A

@ A

@ A @ A

@ A

@ A

@ A@ A

@ A@ A@ A @ A

@ A@ A @ A @ A @ A @ A

@ A @ A

@ A @ A

@ A@ A

@ A @ A

@ A @ A

@ A

@ A @ A

@ A @ A

@ A

@ A

@ A @ A

@ A

@ A

@ A @ A

@ A @ A

@ A @ A @ A @ A @ A @ A @ A

@ A

@ A

@ A

@ A

@ A @ A

IR07DR

IR05DR

IR02DR

DM3003S

DM395S

MW610S

MW611S

F-2

F-1

EA9FEA9D

EA5F

EA5D

IR04D

IR01D

MW237S

MW237D

MW236S

MW236D

MW235D

MW212S

MW212D

MW211S

MW211DMW103S

MW103D

MW102S

MW102D

MW101S

MW101D

DM396D

DM367D

DM361D

DM360D

DM356D

DM355D

DM326S

DM326D

DM325S

DM325D

DM316D

DM315D

DM398DR

DM397DR

DM3020D

DM3019D

DM3018D

DM3017F

DM3016D

DM3015D

DM3014D

DM3013D

DM3012D

DM3011D

DM3010D

DM3009D

DM3007D

DM3006DDM3005SDM3004S

DM3002S

DM3001S

IR04S

IR01S

MW235S

DM361S

DM360S

DM356S

DM355S

DPIT

PICT 4b

PICT 4a

PICT 9PICT 8PICT 7

PICT 3

PICT 3

PICT 1

PICT 2

DPIT1

DPIT2

PICT 6

IR03DR

DM3027S

DM354DR

DM353DR

DM350DR

DM3029D

DM3028D

DM3031S

DM3030S

EW615

EW613

MW606S

EW614

MW612S

MW609S

MW608S

MW607S

MW604S

MW233S

MW233D

MW605D

MW605S

F

C

B

A

FOOTBALL

BASEBALLBASEBALL

BASEBALL

TENNIS

BASKETBALL

BASKETBALL

BASKETBALL

BASKETBALL

BASKETBALL

BASKETBALL

0 2,0001,000 Feet

CLIENT

PROJ

SCALE

Dover Air Force Base Area 6

GIS BY

CHK BY

AER

LS

04/08/2015 PROJ NO

3-1

TITLE

FIGURE

12420 Milestone Center Drive

Germantown, MD 20876

Monitoring Well and Injection Locations

G:\Projects\Dover_AFB\Target_Area_1\Projects\ NA Sampling_Jan2013\wells_injection_Fig 3-1.mxd

04/08/20151:5,500 60446591

DM360D = Sampled DM360S = Gauged

Legend A Monitoring Well

Shallow Source Area Base Boundary

10 µg/L Total Chlorinated Ethenes Contour

Direct Push Injection Transect

Permanent Injection/ Circulation Transect Plume Core lN

Base Housing Transect

3-4

APPENDIX B – TABLES

Table 1 – Soil Gas Data – VOC Detections

TABLE 1- Soil Gas TO-15 Detections

Welch Elementary/Dover Middle School Replacement Site

Dover Air Force Base

Dover, Delaware

Terracon Project No. 7316P090

1,2,4-Trimethylbenzene 24 0.59 J 0.84 0.54 J 0.74 0.64 J 0.49 J 0.54 J 0.015 U 0.49 J 0.015 U

1,3,5-Trimethylbenzene ne 0.88 0.93 0.64 J 0.54 J 0.84 0.79 0.64 J 0.84 0.54 J 0.59 J

2,2,4-trimethylpentane ne 3.2 3.2 3.8 3.5 4.1 37 7.3 4 6.4 3.2

4-ethyltoluene ne 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U

Acetone 110,000 830 960 1100 1400 1200 1700 1300 940 1400 1800

Benzene 12 3.3 2.3 1.9 2.3 1.6 1.4 0.77 1.5 0.73 1.8

Carbon disulfide 2,400 0.034 U 1.1 0.034 U 1.3 0.034 U 2.4 1 0.56 0.62 0.9

Chloroform 4 0.015 U 0.59 J 2.4 0.63 J 1.5 0.68 J 0.54 J 0.49 J 0.015 U 0.59 J

Chloromethane 310 0.041 U 0.6 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U

Ethyl acetate 240 0.044 U 3.6 1.9 0.044 U 0.044 U 0.044 U 0.044 U 0.044 U 0.044 U 0.044 U

Ethylbenzene 36 0.65 0.48 J 0.52 J 0.43 J 0.65 0.56 J 0.91 0.025 U 0.87 0.65

Freon 11 ne 0.9 0.79 J 0.84 0.84 0.96 0.96 0.9 0.84 0.79 J 0.79 J

Freon 12 ne 1.3 1.3 1.4 1.2 0.015 U 1.4 1.3 0.015 U 1.1 1.2

Heptane ne 0.015 U 0.015 U 0.015 U 0.015 U 8.9 0.015 U 25 0.015 U 0.015 U 0.015 U

Isopropyl alcohol 690 0.036 U 27 0.036 U 0.036 U 0.036 U 110 0.036 U 0.036 U 93 100 m&p-Xylene 330 1 J 0.96 J 1.2 J 0.74 J 1 J 0.87 J 1.2 J 0.74 J 1.6 0.91 J

Methyl Ethyl Ketone 17,000 44 35 48 45 37 59 41 39 48 60

Methyl Isobutyl Ketone 10,000 1.8 2.1 1.8 0.039 U 2.8 2.7 2.7 1.7 1.7 1.5

Methylene chloride 2,100 0.56 6 0.45 J 0.9 0.035 U 0.45 J 0.56 0.45 J 0.49 J 1.0 o-Xylene 330 0.48 J 0.48 J 0.48 J 0.039 U 0.48 J 0.039 U 0.69 0.039 U 0.65 0.48 J

Tetrachloroethylene 140 0.017 U 0.017 U 0.81 J 0.75 J 0.017 U 0.017 U 0.017 U 0.017 U 0.017 U 0.017 U

Toluene 17,000 28 4.8 8.8 27 19 19 27 13 40 35

TABLE 1 - continued

1,2,4-Trimethylbenzene 24 0.59 J 0.54 J 0.69 J 0.88 0.69 J 0.49 J 0.69 J 0.84 0.54 J 5.1

1,3,5-Trimethylbenzene ne 0.98 0.64 J 0.84 1.1 0.84 0.79 0.84 0.98 0.84 2.5

2,2,4-trimethylpentane ne 6.3 4.2 7.2 6.1 4.6 6.8 7.6 6.6 6.4 0.022 U

4-ethyltoluene ne 0.026 U 0.026 U 0.54 J 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 0.026 U 2.4

Acetone 110,000 1600 830 1100 2200 860 850 860 890 680 140

Benzene 12 1.9 0.67 0.015 U 1.1 0.93 1.1 1.5 0.83 0.8 0.7

Carbon disulfide 2,400 1.9 0.75 0.68 0.75 0.034 U 0.034 U 1.4 0.59 0.84 0.034 U

Chloroform 4 0.88 0.015 U 0.015 U 2.1 0.015 U 0.015 U 1.1 0.015 U 0.015 U 0.015 U

Chloromethane 310 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.041 U 0.7 0.6

Ethyl acetate 240 0.044 U 0.044 U 0.044 U 0.044 U 1.3 0.044 U 0.044 U 0.044 U 0.044 U 2.3

Ethylbenzene 36 0.78 0.56 J 0.91 1.7 0.69 0.91 1.1 0.69 0.025 U 1.3

Freon 11 ne 1 0.79 J 0.9 0.84 1.4 1.3 2.4 1.7 1.6 0.73 J

Freon 12 ne 1.3 1.2 1.3 1.3 0.015 U 1.5 1.7 0.015 U 0.015 U 1.2

Heptane ne 0.015 U 0.015 U 0.015 U 0.015 U 6.1 0.015 U 0.015 U 0.015 U 0.015 U 0.015 U

Isopropyl alcohol 690 43 0.036 U 54 160 0.036 U 44 0.036 U 0.036 U 0.036 U 4.5 m&p-Xylene 330 1.4 0.87 J 1.7 2.3 0.91 J 1.3 1.5 1 J 0.48 J 3.1

Methyl Ethyl Ketone 17,000 59 26 34 68 32 27 27 20 22 13

Methyl Isobutyl Ketone 10,000 2.1 2.1 0.039 U 2.5 3.2 2.5 0.039 U 2.1 1.7 1.4

Methylene chloride 2,100 0.9 2.2 0.63 0.56 0.56 0.56 0.63 0.63 0.035 U 0.49 J o-Xylene 330 0.52 J 0.039 U 0.52 J 1.1 0.039 U 0.52 J 0.78 0.56 J 0.039 U 1.3

Tetrachloroethylene 140 0.017 U 0.017 U 0.75 J 7.7 4.3 0.75 J 0.017 U 0.017 U 0.017 U 0.017 U

Toluene 17,000 54 25 14 46 11 41 15 18 15 410

NOTES:

1) DE DNREC-SIRS SLs- Delaware Department of Natural Resources and Environmental Control Site Investigation and Restoration Section Screening Levels

2) ne- an RSL has not been established for this analyte

3) No detections exceed the adjusted RSL for Residential Air

4) U - indicates an analyte was not detected above the Method Detection Limit (MDL)

5) J - indicates an analyte was detected above the MDL but below the Practical Quantitation Limit

6) Data were collected on August 3, 2016

Analyte

SG-18 SG-19 Ambient

Sample micrograms per cubic meter (mg/m

Analyte micrograms per cubic meter (mg/m

DE DNREC-

SIRS SLs SG-11

SG-9 SG-10

SG-12 SG-13 SG-14 SG-15 SG-16 SG-17

DE DNREC-

SIRS SLs SG-1 SG-2 SG-3 SG-4

Sample

SG-5 SG-6 SG-7 SG-8

APPENDIX C

ANALYTICAL REPORT

AND CHAIN OF CUSTODY

12-Aug-16Date:

CENTEK LABORATORIES, LLC

ANALYTICAL QC SUMMARY REPORT

Project: Dover Air Force Base

CLIENT: Terracon Consultants, Inc.

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132110

MBLKSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 0.15< 0.15 1,1,2,2-Tetrachloroethane 0.15< 0.15 1,1,2-Trichloroethane 0.15< 0.15 1,1-Dichloroethane 0.15< 0.15 1,1-Dichloroethene 0.15< 0.15 1,2,4-Trichlorobenzene 0.15< 0.15 1,2,4-Trimethylbenzene 0.15< 0.15 1,2-Dibromoethane 0.15< 0.15 1,2-Dichlorobenzene 0.15< 0.15 1,2-Dichloroethane 0.15< 0.15 1,2-Dichloropropane 0.15< 0.15 1,3,5-Trimethylbenzene 0.15< 0.15 1,3-butadiene 0.15< 0.15 1,3-Dichlorobenzene 0.15< 0.15 1,4-Dichlorobenzene 0.15< 0.15 1,4-Dioxane 0.30< 0.30 2,2,4-trimethylpentane 0.15< 0.15 4-ethyltoluene 0.15< 0.15 Acetone 0.30< 0.30 Allyl chloride 0.15< 0.15 Benzene 0.15< 0.15 Benzyl chloride 0.15< 0.15 Bromodichloromethane 0.15< 0.15 Bromoform 0.15< 0.15 Bromomethane 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits S Spike Recovery outside accepted recovery limits

Project: Dover Air Force Base

CLIENT: Terracon Consultants, Inc.

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132110

MBLKSampType: TestCode: 1ugM3_TO15

Carbon disulfide 0.15< 0.15 Carbon tetrachloride 0.15< 0.15 Chlorobenzene 0.15< 0.15 Chloroethane 0.15< 0.15 Chloroform 0.15< 0.15 Chloromethane 0.15< 0.15 cis-1,2-Dichloroethene 0.15< 0.15 cis-1,3-Dichloropropene 0.15< 0.15 Cyclohexane 0.15< 0.15 Dibromochloromethane 0.15< 0.15 Ethyl acetate 0.25< 0.25 Ethylbenzene 0.15< 0.15 Freon 11 0.15< 0.15 Freon 113 0.15< 0.15 Freon 114 0.15< 0.15 Freon 12 0.15< 0.15 Heptane 0.15< 0.15 Hexachloro-1,3-butadiene 0.15< 0.15 Hexane 0.15< 0.15 Isopropyl alcohol 0.15< 0.15 m&p-Xylene 0.30< 0.30 Methyl Butyl Ketone 0.30< 0.30 Methyl Ethyl Ketone 0.30< 0.30 Methyl Isobutyl Ketone 0.30< 0.30 Methyl tert-butyl ether 0.15< 0.15 Methylene chloride 0.15< 0.15 o-Xylene 0.15< 0.15 Propylene 0.15< 0.15 Styrene 0.15< 0.15 Tetrachloroethylene 0.15< 0.15 Tetrahydrofuran 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132110

MBLKSampType: TestCode: 1ugM3_TO15

Toluene 0.15< 0.15 trans-1,2-Dichloroethene 0.15< 0.15 trans-1,3-Dichloropropene 0.15< 0.15 Trichloroethene 0.15< 0.15 Vinyl acetate 0.15< 0.15 Vinyl Bromide 0.15< 0.15 Vinyl chloride 0.15< 0.15 Surr: Bromofluorobenzene 1 97.0 70 1300 00.9700

Sample ID: AMB1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132128

MBLKSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 0.15< 0.15 1,1,2,2-Tetrachloroethane 0.15< 0.15 1,1,2-Trichloroethane 0.15< 0.15 1,1-Dichloroethane 0.15< 0.15 1,1-Dichloroethene 0.15< 0.15 1,2,4-Trichlorobenzene 0.15< 0.15 1,2,4-Trimethylbenzene 0.15< 0.15 1,2-Dibromoethane 0.15< 0.15 1,2-Dichlorobenzene 0.15< 0.15 1,2-Dichloroethane 0.15< 0.15 1,2-Dichloropropane 0.15< 0.15 1,3,5-Trimethylbenzene 0.15< 0.15 1,3-butadiene 0.15< 0.15 1,3-Dichlorobenzene 0.15< 0.15 1,4-Dichlorobenzene 0.15< 0.15 1,4-Dioxane 0.30< 0.30 2,2,4-trimethylpentane 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132128

MBLKSampType: TestCode: 1ugM3_TO15

4-ethyltoluene 0.15< 0.15 Acetone 0.30< 0.30 Allyl chloride 0.15< 0.15 Benzene 0.15< 0.15 Benzyl chloride 0.15< 0.15 Bromodichloromethane 0.15< 0.15 Bromoform 0.15< 0.15 Bromomethane 0.15< 0.15 Carbon disulfide 0.15< 0.15 Carbon tetrachloride 0.15< 0.15 Chlorobenzene 0.15< 0.15 Chloroethane 0.15< 0.15 Chloroform 0.15< 0.15 Chloromethane 0.15< 0.15 cis-1,2-Dichloroethene 0.15< 0.15 cis-1,3-Dichloropropene 0.15< 0.15 Cyclohexane 0.15< 0.15 Dibromochloromethane 0.15< 0.15 Ethyl acetate 0.25< 0.25 Ethylbenzene 0.15< 0.15 Freon 11 0.15< 0.15 Freon 113 0.15< 0.15 Freon 114 0.15< 0.15 Freon 12 0.15< 0.15 Heptane 0.15< 0.15 Hexachloro-1,3-butadiene 0.15< 0.15 Hexane 0.15< 0.15 Isopropyl alcohol 0.15< 0.15 m&p-Xylene 0.30< 0.30 Methyl Butyl Ketone 0.30< 0.30 Methyl Ethyl Ketone 0.30< 0.30

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132128

MBLKSampType: TestCode: 1ugM3_TO15

Methyl Isobutyl Ketone 0.30< 0.30 Methyl tert-butyl ether 0.15< 0.15 Methylene chloride 0.15< 0.15 o-Xylene 0.15< 0.15 Propylene 0.15< 0.15 Styrene 0.15< 0.15 Tetrachloroethylene 0.15< 0.15 Tetrahydrofuran 0.15< 0.15 Toluene 0.15< 0.15 trans-1,2-Dichloroethene 0.15< 0.15 trans-1,3-Dichloropropene 0.15< 0.15 Trichloroethene 0.15< 0.15 Vinyl acetate 0.15< 0.15 Vinyl Bromide 0.15< 0.15 Vinyl chloride 0.15< 0.15 Surr: Bromofluorobenzene 1 92.0 70 1300 00.9200

Sample ID: AMB1UG-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132142

MBLKSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 0.15< 0.15 1,1,2,2-Tetrachloroethane 0.15< 0.15 1,1,2-Trichloroethane 0.15< 0.15 1,1-Dichloroethane 0.15< 0.15 1,1-Dichloroethene 0.15< 0.15 1,2,4-Trichlorobenzene 0.15< 0.15 1,2,4-Trimethylbenzene 0.15< 0.15 1,2-Dibromoethane 0.15< 0.15 1,2-Dichlorobenzene 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132142

MBLKSampType: TestCode: 1ugM3_TO15

1,2-Dichloroethane 0.15< 0.15 1,2-Dichloropropane 0.15< 0.15 1,3,5-Trimethylbenzene 0.15< 0.15 1,3-butadiene 0.15< 0.15 1,3-Dichlorobenzene 0.15< 0.15 1,4-Dichlorobenzene 0.15< 0.15 1,4-Dioxane 0.30< 0.30 2,2,4-trimethylpentane 0.15< 0.15 4-ethyltoluene 0.15< 0.15 Acetone 0.30< 0.30 Allyl chloride 0.15< 0.15 Benzene 0.15< 0.15 Benzyl chloride 0.15< 0.15 Bromodichloromethane 0.15< 0.15 Bromoform 0.15< 0.15 Bromomethane 0.15< 0.15 Carbon disulfide 0.15< 0.15 Carbon tetrachloride 0.15< 0.15 Chlorobenzene 0.15< 0.15 Chloroethane 0.15< 0.15 Chloroform 0.15< 0.15 Chloromethane 0.15< 0.15 cis-1,2-Dichloroethene 0.15< 0.15 cis-1,3-Dichloropropene 0.15< 0.15 Cyclohexane 0.15< 0.15 Dibromochloromethane 0.15< 0.15 Ethyl acetate 0.25< 0.25 Ethylbenzene 0.15< 0.15 Freon 11 0.15< 0.15 Freon 113 0.15< 0.15 Freon 114 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132142

MBLKSampType: TestCode: 1ugM3_TO15

Freon 12 0.15< 0.15 Heptane 0.15< 0.15 Hexachloro-1,3-butadiene 0.15< 0.15 Hexane 0.15< 0.15 Isopropyl alcohol 0.15< 0.15 m&p-Xylene 0.30< 0.30 Methyl Butyl Ketone 0.30< 0.30 Methyl Ethyl Ketone 0.30< 0.30 Methyl Isobutyl Ketone 0.30< 0.30 Methyl tert-butyl ether 0.15< 0.15 Methylene chloride 0.15< 0.15 o-Xylene 0.15< 0.15 Propylene 0.15< 0.15 Styrene 0.15< 0.15 Tetrachloroethylene 0.15< 0.15 Tetrahydrofuran 0.15< 0.15 Toluene 0.15< 0.15 trans-1,2-Dichloroethene 0.15< 0.15 trans-1,3-Dichloropropene 0.15< 0.15 Trichloroethene 0.15< 0.15 Vinyl acetate 0.15< 0.15 Vinyl Bromide 0.15< 0.15 Vinyl chloride 0.15< 0.15 Surr: Bromofluorobenzene 1 92.0 70 1300 00.9200

Sample ID: AMB1UG-081016

Batch ID: R11291 TestNo: TO-15 Analysis Date: 8/10/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11291

SeqNo: 132170

MBLKSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-081016

Batch ID: R11291 TestNo: TO-15 Analysis Date: 8/10/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11291

SeqNo: 132170

MBLKSampType: TestCode: 1ugM3_TO15

1,1,2,2-Tetrachloroethane 0.15< 0.15 1,1,2-Trichloroethane 0.15< 0.15 1,1-Dichloroethane 0.15< 0.15 1,1-Dichloroethene 0.15< 0.15 1,2,4-Trichlorobenzene 0.15< 0.15 1,2,4-Trimethylbenzene 0.15< 0.15 1,2-Dibromoethane 0.15< 0.15 1,2-Dichlorobenzene 0.15< 0.15 1,2-Dichloroethane 0.15< 0.15 1,2-Dichloropropane 0.15< 0.15 1,3,5-Trimethylbenzene 0.15< 0.15 1,3-butadiene 0.15< 0.15 1,3-Dichlorobenzene 0.15< 0.15 1,4-Dichlorobenzene 0.15< 0.15 1,4-Dioxane 0.30< 0.30 2,2,4-trimethylpentane 0.15< 0.15 4-ethyltoluene 0.15< 0.15 Acetone 0.30< 0.30 Allyl chloride 0.15< 0.15 Benzene 0.15< 0.15 Benzyl chloride 0.15< 0.15 Bromodichloromethane 0.15< 0.15 Bromoform 0.15< 0.15 Bromomethane 0.15< 0.15 Carbon disulfide 0.15< 0.15 Carbon tetrachloride 0.15< 0.15 Chlorobenzene 0.15< 0.15 Chloroethane 0.15< 0.15 Chloroform 0.15< 0.15 Chloromethane 0.15< 0.15 cis-1,2-Dichloroethene 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-081016

Batch ID: R11291 TestNo: TO-15 Analysis Date: 8/10/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11291

SeqNo: 132170

MBLKSampType: TestCode: 1ugM3_TO15 cis-1,3-Dichloropropene 0.15< 0.15 Cyclohexane 0.15< 0.15 Dibromochloromethane 0.15< 0.15 Ethyl acetate 0.25< 0.25 Ethylbenzene 0.15< 0.15 Freon 11 0.15< 0.15 Freon 113 0.15< 0.15 Freon 114 0.15< 0.15 Freon 12 0.15< 0.15 Heptane 0.15< 0.15 Hexachloro-1,3-butadiene 0.15< 0.15 Hexane 0.15< 0.15 Isopropyl alcohol 0.15< 0.15 m&p-Xylene 0.30< 0.30 Methyl Butyl Ketone 0.30< 0.30 Methyl Ethyl Ketone 0.30< 0.30 Methyl Isobutyl Ketone 0.30< 0.30 Methyl tert-butyl ether 0.15< 0.15 Methylene chloride 0.15< 0.15 o-Xylene 0.15< 0.15 Propylene 0.15< 0.15 Styrene 0.15< 0.15 Tetrachloroethylene 0.15< 0.15 Tetrahydrofuran 0.15< 0.15 Toluene 0.15< 0.15 trans-1,2-Dichloroethene 0.15< 0.15 trans-1,3-Dichloropropene 0.15< 0.15 Trichloroethene 0.15< 0.15 Vinyl acetate 0.15< 0.15 Vinyl Bromide 0.15< 0.15 Vinyl chloride 0.15< 0.15

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: AMB1UG-081016

Batch ID: R11291 TestNo: TO-15 Analysis Date: 8/10/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11291

SeqNo: 132170

MBLKSampType: TestCode: 1ugM3_TO15

Surr: Bromofluorobenzene 1 89.0 70 1300 00.8900

Sample ID: ALCS1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132111

LCSSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 1 86.0 70 1300.15 00.8600 1,1,2,2-Tetrachloroethane 1 111 70 1300.15 01.110 1,1,2-Trichloroethane 1 99.0 70 1300.15 00.9900 1,1-Dichloroethane 1 109 70 1300.15 01.090 1,1-Dichloroethene 1 106 70 1300.15 01.060 1,2,4-Trichlorobenzene 1 92.0 70 1300.15 00.9200 1,2,4-Trimethylbenzene 1 120 70 1300.15 01.200 1,2-Dibromoethane 1 107 70 1300.15 01.070 1,2-Dichlorobenzene 1 106 70 1300.15 01.060 1,2-Dichloroethane 1 99.0 70 1300.15 00.9900 1,2-Dichloropropane 1 110 70 1300.15 01.100 1,3,5-Trimethylbenzene 1 111 70 1300.15 01.110 1,3-butadiene 1 91.0 70 1300.15 00.9100 1,3-Dichlorobenzene 1 105 70 1300.15 01.050 1,4-Dichlorobenzene 1 106 70 1300.15 01.060 1,4-Dioxane 1 104 70 1300.30 01.040 2,2,4-trimethylpentane 1 120 70 1300.15 01.200 4-ethyltoluene 1 116 70 1300.15 01.160 Acetone 1 99.0 70 1300.30 00.9900 Allyl chloride 1 121 70 1300.15 01.210 Benzene 1 106 70 1300.15 01.060 Benzyl chloride 1 110 70 1300.15 01.100 Bromodichloromethane 1 93.0 70 1300.15 00.9300 Bromoform 1 99.0 70 1300.15 00.9900

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: ALCS1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132111

LCSSampType: TestCode: 1ugM3_TO15

Bromomethane 1 76.0 70 1300.15 00.7600 Carbon disulfide 1 107 70 1300.15 01.070 Carbon tetrachloride 1 82.0 70 1300.15 00.8200 Chlorobenzene 1 109 70 1300.15 01.090 Chloroethane 1 89.0 70 1300.15 00.8900 Chloroform 1 101 70 1300.15 01.010 Chloromethane 1 88.0 70 1300.15 00.8800 cis-1,2-Dichloroethene 1 120 70 1300.15 01.200 cis-1,3-Dichloropropene 1 108 70 1300.15 01.080 Cyclohexane 1 123 70 1300.15 01.230 Dibromochloromethane 1 97.0 70 1300.15 00.9700 Ethyl acetate 1 127 70 1300.25 01.270 Ethylbenzene 1 116 70 1300.15 01.160 Freon 11 1 72.0 70 1300.15 00.7200 Freon 113 1 99.0 70 1300.15 00.9900 Freon 114 1 79.0 70 1300.15 00.7900 Freon 12 1 78.0 70 1300.15 00.7800 Heptane 1 126 70 1300.15 01.260 Hexachloro-1,3-butadiene 1 82.0 70 1300.15 00.8200 Hexane 1 125 70 1300.15 01.250 Isopropyl alcohol 1 89.0 70 1300.15 00.8900 m&p-Xylene 2 113 70 1300.30 02.260 Methyl Butyl Ketone 1 113 70 1300.30 01.130 Methyl Ethyl Ketone 1 123 70 1300.30 01.230 Methyl Isobutyl Ketone 1 118 70 1300.30 01.180 Methyl tert-butyl ether 1 121 70 1300.15 01.210 Methylene chloride 1 103 70 1300.15 01.030 o-Xylene 1 110 70 1300.15 01.100 Propylene 1 103 70 1300.15 01.030 Styrene 1 118 70 1300.15 01.180 Tetrachloroethylene 1 103 70 1300.15 01.030

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: ALCS1UG-080716

Batch ID: R11288 TestNo: TO-15 Analysis Date: 8/7/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11288

SeqNo: 132111

LCSSampType: TestCode: 1ugM3_TO15

Tetrahydrofuran 1 126 70 1300.15 01.260 Toluene 1 118 70 1300.15 01.180 trans-1,2-Dichloroethene 1 112 70 1300.15 01.120 trans-1,3-Dichloropropene 1 103 70 1300.15 01.030 Trichloroethene 1 102 70 1300.15 01.020 Vinyl acetate 1 124 70 1300.15 01.240 Vinyl Bromide 1 80.0 70 1300.15 00.8000 Vinyl chloride 1 89.0 70 1300.15 00.8900 Surr: Bromofluorobenzene 1 101 70 1300 01.010

Sample ID: ALCS1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132129

LCSSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 1 91.0 70 1300.15 00.9100 1,1,2,2-Tetrachloroethane 1 124 70 1300.15 01.240 1,1,2-Trichloroethane 1 105 70 1300.15 01.050 1,1-Dichloroethane 1 117 70 1300.15 01.170 1,1-Dichloroethene 1 110 70 1300.15 01.100 1,2,4-Trichlorobenzene 1 117 70 1300.15 01.170 1,2,4-Trimethylbenzene 1 128 70 1300.15 01.280 1,2-Dibromoethane 1 110 70 1300.15 01.100 1,2-Dichlorobenzene 1 108 70 1300.15 01.080 1,2-Dichloroethane 1 106 70 1300.15 01.060 1,2-Dichloropropane 1 123 70 1300.15 01.230 1,3,5-Trimethylbenzene 1 122 70 1300.15 01.220 1,3-butadiene 1 103 70 1300.15 01.030 1,3-Dichlorobenzene 1 107 70 1300.15 01.070 1,4-Dichlorobenzene 1 104 70 1300.15 01.040 1,4-Dioxane 1 155 70 130 S0.30 01.550

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: ALCS1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132129

LCSSampType: TestCode: 1ugM3_TO15

2,2,4-trimethylpentane 1 126 70 1300.15 01.260 4-ethyltoluene 1 122 70 1300.15 01.220 Acetone 1 119 70 1300.30 01.190 Allyl chloride 1 120 70 1300.15 01.200 Benzene 1 114 70 1300.15 01.140 Benzyl chloride 1 116 70 1300.15 01.160 Bromodichloromethane 1 98.0 70 1300.15 00.9800 Bromoform 1 99.0 70 1300.15 00.9900 Bromomethane 1 85.0 70 1300.15 00.8500 Carbon disulfide 1 111 70 1300.15 01.110 Carbon tetrachloride 1 87.0 70 1300.15 00.8700 Chlorobenzene 1 113 70 1300.15 01.130 Chloroethane 1 104 70 1300.15 01.040 Chloroform 1 104 70 1300.15 01.040 Chloromethane 1 102 70 1300.15 01.020 cis-1,2-Dichloroethene 1 124 70 1300.15 01.240 cis-1,3-Dichloropropene 1 112 70 1300.15 01.120 Cyclohexane 1 127 70 1300.15 01.270 Dibromochloromethane 1 98.0 70 1300.15 00.9800 Ethyl acetate 1 140 70 130 S0.25 01.400 Ethylbenzene 1 123 70 1300.15 01.230 Freon 11 1 86.0 70 1300.15 00.8600 Freon 113 1 103 70 1300.15 01.030 Freon 114 1 90.0 70 1300.15 00.9000 Freon 12 1 84.0 70 1300.15 00.8400 Heptane 1 122 70 1300.15 01.220 Hexachloro-1,3-butadiene 1 106 70 1300.15 01.060 Hexane 1 124 70 1300.15 01.240 Isopropyl alcohol 1 126 70 1300.15 01.260 m&p-Xylene 2 120 70 1300.30 02.400 Methyl Butyl Ketone 1 288 70 130 S0.30 02.880

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: ALCS1UG-080816

Batch ID: R11289 TestNo: TO-15 Analysis Date: 8/8/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11289

SeqNo: 132129

LCSSampType: TestCode: 1ugM3_TO15

Methyl Ethyl Ketone 1 115 70 1300.30 01.150 Methyl Isobutyl Ketone 1 270 70 130 S0.30 02.700 Methyl tert-butyl ether 1 120 70 1300.15 01.200 Methylene chloride 1 114 70 1300.15 01.140 o-Xylene 1 117 70 1300.15 01.170 Propylene 1 114 70 1300.15 01.140 Styrene 1 121 70 1300.15 01.210 Tetrachloroethylene 1 104 70 1300.15 01.040 Tetrahydrofuran 1 125 70 1300.15 01.250 Toluene 1 125 70 1300.15 01.250 trans-1,2-Dichloroethene 1 122 70 1300.15 01.220 trans-1,3-Dichloropropene 1 107 70 1300.15 01.070 Trichloroethene 1 106 70 1300.15 01.060 Vinyl acetate 1 133 70 130 S0.15 01.330 Vinyl Bromide 1 90.0 70 1300.15 00.9000 Vinyl chloride 1 98.0 70 1300.15 00.9800 Surr: Bromofluorobenzene 1 99.0 70 1300 00.9900

Sample ID: A1UGLCS-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132143

LCSSampType: TestCode: 1ugM3_TO15

1,1,1-Trichloroethane 1 101 70 1300.15 01.010 1,1,2,2-Tetrachloroethane 1 121 70 1300.15 01.210 1,1,2-Trichloroethane 1 117 70 1300.15 01.170 1,1-Dichloroethane 1 116 70 1300.15 01.160 1,1-Dichloroethene 1 118 70 1300.15 01.180 1,2,4-Trichlorobenzene 1 102 70 1300.15 01.020 1,2,4-Trimethylbenzene 1 123 70 1300.15 01.230 1,2-Dibromoethane 1 115 70 1300.15 01.150

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: A1UGLCS-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132143

LCSSampType: TestCode: 1ugM3_TO15

1,2-Dichlorobenzene 1 115 70 1300.15 01.150 1,2-Dichloroethane 1 116 70 1300.15 01.160 1,2-Dichloropropane 1 117 70 1300.15 01.170 1,3,5-Trimethylbenzene 1 119 70 1300.15 01.190 1,3-butadiene 1 129 70 1300.15 01.290 1,3-Dichlorobenzene 1 111 70 1300.15 01.110 1,4-Dichlorobenzene 1 112 70 1300.15 01.120 1,4-Dioxane 1 121 70 1300.30 01.210 2,2,4-trimethylpentane 1 123 70 1300.15 01.230 4-ethyltoluene 1 117 70 1300.15 01.170 Acetone 1 120 70 1300.30 01.200 Allyl chloride 1 141 70 130 S0.15 01.410 Benzene 1 126 70 1300.15 01.260 Benzyl chloride 1 94.0 70 1300.15 00.9400 Bromodichloromethane 1 109 70 1300.15 01.090 Bromoform 1 101 70 1300.15 01.010 Bromomethane 1 101 70 1300.15 01.010 Carbon disulfide 1 119 70 1300.15 01.190 Carbon tetrachloride 1 98.0 70 1300.15 00.9800 Chlorobenzene 1 118 70 1300.15 01.180 Chloroethane 1 126 70 1300.15 01.260 Chloroform 1 116 70 1300.15 01.160 Chloromethane 1 128 70 1300.15 01.280 cis-1,2-Dichloroethene 1 124 70 1300.15 01.240 cis-1,3-Dichloropropene 1 118 70 1300.15 01.180 Cyclohexane 1 123 70 1300.15 01.230 Dibromochloromethane 1 102 70 1300.15 01.020 Ethyl acetate 1 145 70 130 S0.25 01.450 Ethylbenzene 1 124 70 1300.15 01.240 Freon 11 1 105 70 1300.15 01.050 Freon 113 1 113 70 1300.15 01.130

Qualifiers: . Results reported are not blank corrected E Estimated Value above quantitation range H Holding times for preparation or analysis exceeded J Analyte detected below quantitation limit ND Not Detected at the Limit of Detection R RPD outside accepted recovery limits

Work Order: C1608018

TestCode: 1ugM3_TO15

Sample ID: A1UGLCS-080916

Batch ID: R11290 TestNo: TO-15 Analysis Date: 8/9/2016

Prep Date:

Analyte Result SPK value SPK Ref Val %REC RPD Ref Val %RPDLowLimit HighLimit RPDLimit Qual

Units: ppbV

PQL

Client ID: ZZZZZ

RunNo: 11290

SeqNo: 132143

LCSSampType: TestCode: 1ugM3_TO15

Freon 114 1 111 70 1300.15 01.110 Freon 12 1 95.0 70 1300.15 00.9500 Heptane 1 158 70 130 S0.15 01.580 Hexachloro-1,3-butadiene 1 95.0 70 1300.15 00.9500 Hexane 1 122 70 1300.15 01.220 Isopropyl alcohol 1 122 70 1300.15 01.220 m&p-Xylene 2 122 70 1300.30 02.440 Methyl Butyl Ketone 1 120 70 1300.30 01.200 Methyl Ethyl Ketone 1 103 70 1300.30 01.030 Methyl Isobutyl Ketone 1 123 70 1300.30 01.230 Methyl tert-butyl ether 1 128 70 1300.15 01.280 Methylene chloride 1 121 70 1300.15 01.210 o-Xylene 1 126 70 1300.15 01.260 Propylene 1 127 70 1300.15 01.270 Styrene 1 124 70 1300.15 01.240 Tetrachloroethylene 1 107 70 1300.15 01.070 Tetrahydrofuran 1 128 70 1300.15 01.280 Toluene 1 126 70 1300.15 01.260…