DavidsonMidwayConvenienceCenter_LeachateReleaseReponsePlan_DIN26698_20160830

August 30, 2016

Ms. Jaclynne Drummond
NCDEQ - Division of Waste Management
Asheville Regional Office
2090 U.S. 70 Highway
Swannanoa, NC 28778-8211

RE: Leachate Release Response Plan
Davidson County Midway Convenience Center
Lexington, North Carolina

Dear Ms. Drummond:

This Leachate Seep Response Plan has been prepared in response to the e-mail from Jason
Watkins of August 11th related to observed leachate at the Midway Convenience Center. This
e-mail requires a sampling plan to be submitted to you to evaluate potential leachate
releases from containers at the convenience center. To evaluate the extent of environmental
impact resulting from the leachate release Smith Gardner, Inc. (S+G) will perform the
following scope of work.

Sampling Plan

Soil Sample Collection and Analysis

S+G personnel will mobilize to the site to collect soil samples from the flow path of the
leachate near an open top container and a compactor shown on the attached Figure 1. To
evaluate soil quality within the flow path, S+G proposes to collect a total of three discreet
grab samples; one sample will be collected in the soil near the concrete pad under container
D12, a second sample will be collected from the soil near Compactor #2. Due to the naturally
occurring inorganic metals in the soils of North Carolina, S+G will also collect a background
sample upgradient and away from the leachate flow path. Background sample results will
be compared with samples collected in the flow path, to evaluate the concentrations of
naturally occurring constituents. The proposed sampling locations are shown on Figure 1.

Each sample will be collected from a depth between one (1) and two (2) feet below grade.
Samples will be analyzed for the Appendix I list of constituents (40 CFR 258 Appendix I) by a
North Carolina certified laboratory.

Reporting

Within 15 business days after receiving the laboratory analytical data, S+G will submit a
report to NCDEQ summarizing sample collection techniques and laboratory analytical data
results. Analytical data will be compared to site background conditions (Upgradient soil
Ms. Drummond
August 30, 2016
Page 2 of 2
analysis) and relevant standards (NC Soil Preliminary Soil Remediation Goals). This report
will also include a map of sampling locations, conclusions and recommendations.

S+G appreciates your timely review of this leachate release response plan and we are
prepared to implement it following approval. If you have any questions or require additional
information, please contact us at 919-828-0577 or by email below.

Sincerely,
SMITH GARDNER, INC.

Pieter K. Scheer, P.E. Joan A. Smyth, P.G.
Senior Engineer Senior Hydrogeologist
[e-mail] [e-mail]

Attachments - Figure 1

cc: Rex Buck – Davidson County
Steven Sink – Davidson County
Susan Heim - NCDEQ

H:\Projects\Davidson County (NC)\Convenience Center Invest Plan_Davidson.docx
SOIL SAMPLE
BACKGROUND SOIL SAMPLE
SOIL SAMPLE
Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/AirbusDS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, andthe GIS User Community
G :\C A D \D a v i d s o n \D a v d c o 1 6 -5 \s h e e t s \D A V D C O -A 0 8 1 6 .m x d
DRAWN:APPROVED:SCALE:FIGURE NO.:PROJECT NO.:DATE:
C.T.J.J.A.S.1AS SHOWN Aug. 2016 DAVDCO 16-5
SOIL SAMPLING LOCATIONS
MIDWAY CONVENIENCE CENTER
DAVIDSON COUNTY, NORTH CAROLINA
³
0 50 100 150 200Feet