20088_Ark_Les_Labs_AWP_20161223

December 23, 2016 Mr. Bruce Nicholson VIA EMAIL: [e-mail] Program Manager NC Division of Waste Management Brownfields Program 217 West Jones Street Raleigh, North Carolina 27603 Re: VAPOR INTRUSION INDOOR AIR TESTING WORK PLAN FORMER ARK‐LES LABORATORIES 3400 YONKERS ROAD – RALEIGH, WAKE COUNTY, NC BROWNFIELD PROJECT NO. 20088‐16‐92 MCADAMS PROPOSAL NO. SPEC-17000 Dear Mr. Nicholson: The John R. McAdams Company (McAdams) has prepared this work plan on behalf of John S. Carbone, LLC (Carbone) summarizing the vapor intrusion testing services that are planned for the above property located at 3400 Yonkers Road in Raleigh. The proposed testing, subject to your review and approval, is in support of obtaining a Brownfields Agreement from the North Carolina Division of Waste Management (NCDWM), per your recent discussions with Carbone. As the work is tentatively planned for Wednesday, December 28, 2016 (in order to obtain expedited lab results and finalize a report by January 6, 2017), a timely review would be greatly appreciated. BACKGROUND It is our understanding that the subject site is currently used for commercial purposes and has an open warehouse-type floor plan with a smaller showroom area. Groundwater sampling conducted by the EI Group (EI) in February 2014 and October 2016 noted the presence of chlorinated solvents in four of the seven groundwater monitoring wells (MW-3 through MW-6) at the site. Figures from that report have been attached, which include: • Figure 1 - Site Location Map • Figure 2 – Aerial Photograph • Figure 3 – Site Map W/Monitoring Well Locations • Figure 4 – Groundwater Flow Map (10/24/16) 1,1-dichloroethane (1,1-DCA), 1,1-dichloroethylene (1,1-DCE), and cis-1,2-DCE were detected in MW-3, MW-4, and MW-5; however, the reported concentrations do not exceed the respective NC 2L standards. There were no other detectable concentrations of VOCs in any of the groundwater samples.
Mr. Bruce Nicholson Vapor Intrusion Indoor Air Testing Work Plan 3400 Yonkers Road Project - Raleigh, NC December 23, 2016 Page 2 of 3
SPEC-17000
The EI report concluded that concentrations in MW-5 and MW-6 exceed the NC 2L groundwater quality standard for trichloroethylene (TCE). The summary table of results from the EI testing is included as Attachment 1 to this work plan. Prior sub-slab and soil gas testing at the site on October 2015 and December 2016 by Highland Environmental Solutions Raleigh NC (HES) indicated that several site contaminants of concern (COCs) were detected at concentrations exceeding applicable non-residential soil gas screening levels. The summary table of results from the HES testing is included as Attachment 2. The list of analytes in this table will constitute the site-specific COC analyte list for the testing proposed in this work plan. WORK PLAN SAMPLING AND ANALYSIS PROTOCOLS The proposed air sample testing will be conducted in accordance with Brownfield’s Program guidance1 and comprised of the following: Indoor Air Testing
• Collection of six (6) indoor air samples and one outdoor/ambient air sample for analysis of COCs only, using EPA Compendium Method TO-15 Determination of Volatile Organic Compounds (VOCs) in Air Collected in Specially-Prepared Canisters and Analyzed by Gas Chromatography/Mass Spectrometry (GC/MS)”.
o The air testing will involve obtaining air samples at six indoor locations using 6-liter Summa canisters fitted with 8-hour flow regulators.
o One of the indoor locations will involve collection of a duplicate sample (via two canisters connected with an inline tee and employing one 8-hour flow regulator).
o The ambient sample will be collected at the fresh-air makeup intake one of the operating roof HVAC units OR at ground-level at the southwest of the building in the vicinity of monitoring wells MW-5 and MW-6 (pending roof access).

1 “Vapor Intrusion Guidance”, NCDENR, Division of Waste Management, Brownfields
Program, April 2014.
Mr. Bruce Nicholson Vapor Intrusion Indoor Air Testing Work Plan 3400 Yonkers Road Project - Raleigh, NC December 23, 2016 Page 3 of 3
SPEC-17000
o The air samples will be collected at the approximate locations as shown in Figure 5 (markup drawing of EI Figure 3).
Due to the client’s desire to receive report of these findings by January 6, 2017, the testing is tentatively scheduled to be conducted on Wednesday December 28th. This will allow expedited laboratory results to be received by the following Wednesday and the final report submitted by the deadline. The report will include the sampling methodology, laboratory results, a comparison of detected analyte concentrations to current Non-Residential Indoor Air Screening Levels (NRIASLs), and an opinion of the risk to occupants from vapor intrusion at the site. CLOSING We will be happy to assist with any comments you may have regarding this proposed work plan. Please let us know your approval of the above scope of work as soon as possible. Sincerely, THE JOHN R. McADAMS COMPANY, INC. Robert D. Hill, PE Jeffrey Tyburski, PG Principal Consultant Director, Environmental Services Attachments

ATTACHMENT 1 SUMMARY TABLE OF RESULTS FROM THE 11/4/16 EI GROUNDWATER QUALITY ASSESSMENT REPORT
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ATTACHMENT 2 SUMMARY TABLE OF SOIL VAPOR RESULTS FROM THE HES TESTING ON 10/27/15 AND 12/1/16
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ATTACHMENT 3 FIGURES
SITE LOCATION MAP
3400 Yonkers Road-Kimshe
Raleigh, North Carolina
N
Not AvailableORIGINAL SCALE:
QUAD:Raleigh East, NC
PROJECT NUMBER:ENMO160157.00
FIGURE NUMBER:1
AERIAL PHOTOGRAPH
3400 Yonkers Road-Kimshe
Raleigh, North Carolina
N
Not availableSCALE:
SOURCE:
PROJECT NUMBER:ENMO160157.00
FIGURE NUMBER:2
2012, Wake GIS website
Saint David’s School Athletic Field
Transport
Truck
Center
House of Lights Inc.
Storage Trust Properties
Intrex Inc.
SITE MAP W/ MONITORING WELL LOCATIONS
3400 Yonkers Road
Raleigh, North Carolina
N
1 in = 120 ftAPPROX. SCALE:
DRAWN BY:DMA
PROJECT NUMBER:ENMO160157.00
FIGURE NUMBER:3
Approximate Property Boundary
Solid Waste Dumpster
Pad-Mounted Transformer
Generator
Empty 55-Gallon Drum
Groundwater Monitoring Well)
SW
wooded
Saint David’s School
Athletic Fields
I-440
SW
M. Alder’s Son, Inc.,
florist supplies distribution
grassed
grassed
wooded
pipe and materials
storage
Ark-Les
(vacant)
distributionwarehouse
M. Alder’s Son, Inc.,
florist supplies distribution
Fmr Ark-Les space, interior transformer, drains, etc.
Fmr Ark-Les space, possible
laboratory, heavy equipment,
processing room
Transport Truck Center
Well Built Properties
Intrex
Inc.
Storage Trust Properties
MW-5
MW-1
MW-2
MW-3
MW-4
MW-6
MW-7
GROUNDWATER FLOW MAPOCTOBER 24, 2016
3400 Yonkers Road-Kimshe
Raleigh, North Carolina
N
1 in = 120 ftAPPROX. SCALE:
DRAWN BY:DMA
PROJECT NUMBER:ENMO160157.00
FIGURE NUMBER:4
Approximate Property Boundary
Solid Waste Dumpster
Pad-Mounted Transformer
Generator
Empty 55-Gallon Drum
Groundwater Monitoring Well
Groundwater Flow Direction
SW
wooded
Saint David’s School
Athletic Fields
I-440
SW
M. Alder’s Son, Inc.,
florist supplies distribution
grassed
grassed
wooded
pipe and materialsstorage
Ark-Les
(vacant)
distributionwarehouse
M. Alder’s Son, Inc.,
florist supplies distribution
Fmr Ark-Les space, interior transformer, drains, etc.
Fmr Ark-Les space, possible
laboratory, heavy equipment,
processing room
Transport Truck Center
Well Built Properties
Intrex
Inc.
Storage Trust Properties
MW-5
MW-1
MW-2
MW-3
MW-4
MW-6
MW-7
92.91
83.83
75.89
76.76
77.65
83.29
75.75
SITE MAP W/ MONITORING WELL LOCATIONS
3400 Yonkers Road
Raleigh, North Carolina
N
1 in = 120 ftAPPROX. SCALE:
DRAWN BY:DMA
PROJECT NUMBER:ENMO160157.00
FIGURE NUMBER:3
Approximate Property Boundary
Solid Waste Dumpster
Pad-Mounted Transformer
Generator
Empty 55-Gallon Drum
Groundwater Monitoring Well)
SW
wooded
Saint David’s School
Athletic Fields
I-440
SW
M. Alder’s Son, Inc.,
florist supplies distribution
grassed
grassed
wooded
pipe and materials
storage
Ark-Les
(vacant)
distributionwarehouse
M. Alder’s Son, Inc.,
florist supplies distribution
Fmr Ark-Les space, interior transformer, drains, etc.
Fmr Ark-Les space, possible
laboratory, heavy equipment,
processing room
Transport Truck Center
Well Built Properties
Intrex
Inc.
Storage Trust Properties
MW-5
MW-1
MW-2
MW-3
MW-4
MW-6
MW-7