5103_JohnstonCoMSW_LeachateAssmtPlan_DIN28457_20170908

September 8, 2017

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
Johnston County Landfill
Smithfield, North Carolina

Dear Ms. Drummond:

This Leachate Release Response Plan has been prepared in response to the e-mail from Liz
Patterson on September 1st related to the incident reported to DEQ in on August 29th. The
release originated from a faulty pipe coupling approximately 30 feet east of the C&D
dewatering manhole and traveled adjacent to the road approximately 85 feet west toward the
drain under the road. There was no visual evidence leachate entered the drain culvert.
Following discovery of the release the coupling was repaired and approximately 100 cubic
yard of wet soil was removed and placed into the MSW Landfill.

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 shown on the attached Figure 1. To evaluate soil quality and determine if the extent
of leachate impacted soil has been removed from 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 faulty
coupling, approximately 30 feet from the C&D dewatering manhole; a second sample will be
collected from the soil near the drain. 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.
Additionally, a surface water sample will be collected from SWPT-2.

The proposed soils and surface water sampling locations are shown on Figure 2.

Ms. Drummond
September 8, 2017
Page 2 of 2
Each soil sample will be collected from a depth between one (1) and two (2) feet below grade.
Soil and groundwater samples will be analyzed for the Appendix I list of constituents (40 CFR
258 Appendix I) by a North Carolina certified laboratory.

Reporting

Within 10 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
analysis and historic SW data) and relevant standards (NC Soil Preliminary Soil Remediation
Goals and 2B Standards). 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.

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

Attachments - Figure 1
Figure 2

cc: Rick Proctor – Johnston County
Liz Patterson – NCDEQ
File

H:\Projects\Johnston County (NC)\Leachate Release\Leachate Release Investigation Plan.docx
DRAWN:APPROVED:SCALE:DATE:PROJECT NO.:FIGURE NO.:FILE NAME:
PREPARED FOR:PREPARED BY:
SMITH
14 N. Boylan Avenue, Raleigh NC 27603
NC LIC. NO. F-1370 (ENGINEERING)
919.828.0577
GARDNER+
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© 2017 Smith Gardner, Inc.
JOHNSTON COUNTY LANDFILL
LEACHATE RELEASE PATH
C.T.J.M.M.G.AS SHOWN JOHNSTON 17-2 1 JOHN-A0733Sep 2017
SAMPLE LOCATION 1
SAMPLE LOCATION 2
DRAWN:APPROVED:SCALE:DATE:PROJECT NO.:FIGURE NO.:FILE NAME:
PREPARED FOR:PREPARED BY:
SMITH
14 N. Boylan Avenue, Raleigh NC 27603
NC LIC. NO. F-1370 (ENGINEERING)
919.828.0577
GARDNER+
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© 2017 Smith Gardner, Inc.
JOHNSTON COUNTY LANDFILL
SOIL AND SURFACE WATER
SAMPLING LOCATIONS
C.T.J.M.M.G.AS SHOWN JOHNSTON 17-2 2 JOHN-A0733Sep 2017
SAMPLE LOCATION 1
SAMPLE LOCATION 2
SWPT-2