4302_DunnErwinLCID_LeachateAssessmentApproval_DIN26794_20161003

PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Secretary

MICHAEL SCOTT
Director
State of North Carolina | Environmental Quality | Waste Management
1646 Mail Service Center | 217 West Jones Street | Raleigh, NC 27699-1646
919 707 8200 T

October 3, 2016

Ms. Amanda Bader, P.E.
County Engineer
Harnett County Engineering and Facilities Management
P.O. Box 2773
Lillington, NC 27546

Re: Leachate Release Assessment
Harnett County Dunn Erwin Landfill, Permit #43-02

Dear Ms. Bader:

The Solid Waste Section (Section) has reviewed the Leachate Release Results report for the Harnett County
Dunn Erwin Landfill prepared by Smith Gardner, Inc. (S+G). The assessment was conducted in accordance
with the assessment plan submitted to the Section on June 30, 2016 to evaluate the leachate release observed
during the June 16, 2016 facility audit. During the audit, leachate was observed flowing behind the yard
waste storage area into a perimeter drainage channel and into the drain on the south side of the LCID.

S+G personnel collected discreet soil samples at three locations along the flow path. Soil sample, SS-1 was
collected near the source of the release, SS-2 was collected within the flow path, and SS-3 was collected at
the end of the leachate flow path. Two background soil samples (BG-1 and BG-2) were also collected to
evaluate the presence of naturally occurring constituents. A water sample (WS-1) was collected from
standing water observed near the SS-1 sample location.

The soil and surface water sample(s) were analyzed for the list of constituents in 40 CFR 258 Appendix I.
Laboratory analytical results were compared to the NCDEQ IHSB Preliminary Soil Remediation Goals
(PSRG) and there were no volatile organic compounds detected at concentrations exceeding the PSRGs.
Vanadium was detected at concentrations exceeding the PSRGs in both the downgradient and background
soil samples. Since vanadium was detected at elevated concentrations in the background soil samples, its
elevated concentration is not believed to be caused by landfill impact. Cobalt was reported at concentrations
exceeding the PSRGs in samples SS-1 and SS-2 and at slightly lower concentrations below the PSRGs in
the background sample. There were no constituents reported above the 2L Standard in the WS-1 sample.

Based on the results presented in the report, the Section will not require additional assessment of the
leachate release. Please contact me at [phone] or by e-mail at [e-mail] if you have
any questions or concerns regarding this letter. Thank you in advance for your cooperation in this matter.
Sincerely,

Ervin Lane
Compliance Hydrogeologist
Solid Waste Section

State of North Carolina | Environmental Quality | Waste Management
1646 Mail Service Center | 217 West Jones Street | Raleigh, NC 27699-1646
919 707 8200 T

cc: Madeline M. German, P.G., Smith Gardner, Inc.
Jason Watkins, Field Operations Branch Head
Drew Hammonds, Eastern District Supervisor
Liz Patterson, Environmental Senior Specialist