Elkins Redevelopment__VI Letter Report

October 14, 2015

Mr. Adam Golden, NR Van Alen Property Owner, LLC
3015 Carrington Mill Blvd., Suite 460
Morrisville, NC 27560
Subject: SOIL GAS SAMPLING LETTER REPORT
FORMER ELKINS CHRYSLER MITSUBISHI
905 JACKIE ROBINSON DRIVE
DURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NUMBER: R2565 TASK 4000
Dear Mr. Golden:

Mid-Atlantic Associates, Inc. is pleased to present this Soil Gas Sampling Letter Report for the
above-referenced site. The sampling was conducted in general accordance with Mid-Atlantic Proposal P15R-7270R dated September 17, 2015.

The subject site is the former Elkins Chrysler Mitsubishi site located at 905 Jackie Robinson Drive in Durham, North Carolina. Mid-Atlantic recently conducted limited environmental assessment
activities (Mid-Atlantic’s Limited Phase II Environmental Site Assessment Report, dated August 17, 2015) at the site. Based on data from this assessment, it appeared that a release(s) from the on-site oil/water separator had adversely-impacted groundwater at that area of the site. Four
petroleum-related compounds and one chlorinated compound (vinyl chloride) were detected in the groundwater sample collected from TMW-1 at concentrations exceeding their respective North Carolina Department of Environmental Quality (NCDEQ), Division of Waste Management (DWM),
Residential Vapor Intrusion Groundwater Screening Level. After review of this report and to support the drafting of a Brownfields Agreement, Mr. Joe Ghiold of the NCDEQ’s Brownfields
Program requested that one soil-gas sample be collected west of TMW-1. At your request, Mid-
Atlantic collected one soil-gas sample at subject site in general accordance with the DWM’s, Vapor Intrusion Guidance (April 2014). This report documents the results of these activities.
The location of the soil-gas sample collected from the site is included on the attached Site and
Soil-Gas Sample Location Map. For collection of the soil-gas sample, asphalt cover was removed and cleared from the boring location and a boring was advanced to a depth of five feet below land
surface (BLS) using a clean hand auger bucket and rods. One-quarter inch outer diameter Nylon
tubing was inserted into the boring within four inches of the bottom of the boring. A filter tip was placed on the tip of the tubing and a sand pack was installed around the filter tip and tubing from
approximately five to four feet BLS. A six-inch thick hydrated bentonite seal was installed above
the sand pack. The assembly was leak tested prior to sampling. A laboratory supplied summa canister was attached to the tubing to collect a soil gas sample. Air within the nylon tubing and
Letter Report of Soil Gas Sampling October 14, 2015
Former Elkins Chrysler Mitsubishi Page 2
Durham, North Carolina

sand pack was purged prior to sample collection. The sample was submitted to the laboratory for
analysis using EPA Method TO-15 for ethylbenzene, naphthalene, 1,2,3-trimethylbenzene, vinyl chloride, and xylenes.

The laboratory analytical report is attached to this letter report and is summarized in Table 1. As shown in Table 1, ethylbenzene, naphthalene, and xylenes were detected in the soil-gas sample
collected from the site at concentrations below the Residential Vapor Intrusion Screening Level for Exterior Soil Gas. Additionally, 1,2,3-trimethylbenzene and vinyl chloride were not detected above the laboratory method detection limits which were below the Residential Vapor Intrusion
Screening Level for Exterior Soil Gas
The data collected during this assessment suggests that there is no vapor intrusion concern
associated the release(s) from the on-site oil/water separator. We appreciate the opportunity to present this report to NR Van Alen Property Owner, LLC. If you
have any questions or need additional information, please feel free to contact us at 919-250-9918. Sincerely,

MID-ATLANTIC ASSOCIATES, INC.

Kelly Johnson, G.I.T.
Staff Scientist
Daniel H. Nielsen, PE Principal Engineer
Attachment: Drawing
Table
Laboratory Report

DRAWING

+U
+U
+U
+U
X Y
´
SITE AND SOIL-GAS SAMPLE LOCATION MAPFORMER ELKINS CHRYSLER MITSUBISHI905 JACKIE ROBINSON DRIVEDURHAM, NORTH CAROLINA
DRAWN BY:DATE:
ENG. CHECK:
JOB NO:
APPROVAL:
DRAFTCHECK:GIS NO:
DWG NO:
REFERENCES:SCALE:
OCTOBER 2015
000R2656.00 T4000
03G-R2656.00T4-11
1. PARCEL BOUNDARY AND TRANSPORTATION DATA FROM DURHAM COUNTY GIS.2. 2013 AERIAL IMAGERY FROM NC CGIA.3. MID-ATLANTIC FIELD NOTES.
1:1,440
0 120 24060Feet
X Y SOIL-GAS SAMPLE LOCATION
+U TEMPORARY MONITORING WELL
SUBJECT SITE PROPERTY BOUNDARY
SURROUNDING PROPERTY BOUNDARY
OIL/WATER SEPARATOR
FORMER WASTE OIL UST
TMW-4
TMW-3
TMW-1
TMW-2
VI-1

TABLE

Sampling Location
VI-1
Sampling Date 9/21/2015
EPA METHOD TO-15 (SELECTED COMPOUNDS)
Ethylbenzene 374 6.3
Naphthalene 20.9 2.1
1,2,3-Trimethylbenzene 34.8 ND (0.59)
Vinyl Chloride 55.9 ND (0.22)
m&p-Xylene 695 26
o-Xylene 695 5.5
NOTES:
1. ND = Not detected above the lab reporting limits shown in parenthesis.
2. Analyte results in BOLD exceed the DWM Residential Soil-Gas Screening Limits.
TABLE 1
SUMMARY OF CHEMICAL CONSTITUENTS DETECTED IN SOIL GAS
FORMER ELKINS CHRYSLER MITSUBISHI
905 JACKIE ROBINSON DRIVE
DURHAM, NORTH CAROLINA
MID-ATLANTIC JOB NO.: R2565 TASK 4000
Parameter
NCDENR DWM
Residential Soil-
Gas Screening
Levels Sept 2015
(ug/m3)

LABORATORY REPORT

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