2906_DavidsonCDLF_LeachateReleaseResultsReport_DIN26509_20160720

July 20, 2016

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

RE: Leachate Release Results
Davidson County Landfill (SWS Permit No. 29-06)
Lexington, North Carolina

Dear Ms. Drummond:

Smith Gardner, Inc. (S+G) on behalf of Davidson County is pleased to present this brief letter
report summarizing the Leachate Response Investigation at the Davidson County Landfill
(Permit No. 29-06). S+G followed the approved Leachate Seep Response Plan related to the
NOV issued June 20, 2016 regarding violations observed during inspections performed June
6 and 10, 2016.

Soil Sample Collection and Analysis

S+G personnel mobilized to the site on June 30, 2016, to collect soil samples from the flow
path of the leachate release. The flow path was confirmed in the field by field personnel
prior to sampling. In accordance with the work plan, S+G collected three discreet grab
samples to evaluate soil quality within the flow path; one sample, SS-1 was collected near
the source of the release, a second sample, SS-2, was collected in the flow path and the third
sample, SS-3, was collected where the leachate flow ended. Due to the naturally occurring
inorganic metals in the soils of North Carolina, S+G also collected a background sample, BG-
1, upgradient and away from the leachate flow path to evaluate the concentrations of
naturally occurring constituents. Sampling locations are shown on Figure 1.

At each location S+G personnel collected the samples at or near ground surface. Samples
were collected in the laboratory provided bottles and were shipped to the laboratory under
proper chain-of-custody (COC). Prism Laboratories, Inc., in Charlotte, NC, a North Carolina
certified laboratory (NC Certification No.: 402) performed the analysis. Collected samples
were analyzed for the Appendix I list of constituents (40 CFR 258 Appendix I). Laboratory
analysis is included as Attachment 1.

Results were compared with the background sample and the NCDENR IHSB Preliminary Soil
Remediation Goals (PRGs). Sample results indicate that leachate did not impact the local
soils. The only volatile organic compound detected was acetone at low concentrations in
samples SS-1, SS-2 and BG-1. Cobalt and vanadium, in samples SS-1, SS-2, SS-3 and BG-1,
Ms. Drummond
July 20, 2016
Page 2 of 2
were detected at concentrations above their PRGs. These inorganic constituents are
naturally occurring in North Carolina soils. Concentrations between the background
location, BG-1, and other locations did not indicate a substantial difference in inorganic
concentrations for the analyzed parameters. Sample results are presented in Table 1.

Summary and Conclusions

Inorganic constituents are naturally occurring in North Carolina soils. Concentrations of
inorganic constituents were consistent across all four samples. Background sample
concentrations were generally consistent with the concentrations from the samples
collected in the flow path. This Indicates the metals concentrations detected in the flow path
are not due to the leachate release.

No organic constituents were reported at concentrations above the PRGs in soil samples,

Based on the soil laboratory analysis, the leachate release does not appear to have adversely
affected the natural environment at the site. If you have any questions or require additional
information, please contact us at 919-828-0577 or by email below.

Sincerely,
SMITH GARDNER, INC.

Madeline M. German, P.G. Joan A. Smyth, P.G.
Project Geologist Senior Hydrogeologist
[e-mail] [e-mail]

Attachments - Figure 1
Table 1
Prism Laboratory Report

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

H:\Projects\Davidson County (NC)\SeepResponse_6-2016\Leachate Release Results_Davidson.docx
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