7803_Roberson_MSWLF_DIN28359_20170728

2211 W. Meadowview Rd., #101
Greensboro, NC 27409
tel: [phone]
fax: [phone]
www.JoyceEngineering.com

July 28, 2017

Ms. Jackie Drummond
Compliance Hydrogeologist
NCDEQ/Solid Waste Section
Asheville Regional Office (ARO)
2090 US Highway 70
Swannanoa, NC 28778
Via email: [e-mail]

RE: Sampling Plan for Leachate Release Assessment
Robeson County Landfill, Permit No. 7803-MSWLF-1997
Robeson County, North Carolina

Dear Jackie:

On behalf of Robeson County, Joyce Engineering (JOYCE) is providing this sampling
plan to evaluate the extent of potential environmental impacts resulting from a recent leachate
release due to a leaking force main at the Robeson County Landfill. The location of the release is
shown on the attached drawing. The leak has been repaired, and the County is prepared to assess
the impact of the release.

Soil Samples:
The County proposes to collect soil samples using a Geoprobe (or similar technology)
from three borings (SB-1, SB-2, & SB-3) in the vicinity of the release. SB-1 will be as close to
the location of the force main leak as possible without risking puncture to the force main. SB-2
and SB-3 will be located approximately 30 feet west and east of SB-1, respectively. We will
collect two soil samples from each boring, one just below the force main (about 7 feet deep) and
one about 3 feet deeper (about 10 feet deep). In addition, the County proposes to collect several
shallow soil samples (SS-4, SS-5, SS-6, SS-7, and SS-8) from the stormwater ditch starting just
below the release area and extending to the small sedimentation pond where the ditch discharges.
These shallow soil samples will be collected at 6-12 inches deep using a hand auger. If the ditch
contains surface water at any of these locations, a surface water sample may be collected instead
of a soil sample. A background soil sample (SB-BG) will be collected from a location
upgradient of the release area and far enough from the landfill or other potential sources to be
considered unlikely to have been impacted.

Ms. Jackie Drummond
July 28, 2017
Page 2 of 3

The proposed locations of the soil borings and shallow soil samples are shown on the
attached drawing. The sample locations may be adjusted in the field, if necessary. If any area
along the ditch is observed to have stained soil, then the shallow soil sample locations will be
adjusted to ensure that a sample of the stained soil is collected.

Surface Water Samples:
The County proposes to collect a surface water sample (SW-A) from the small pond
located at the outfall of the stormwater ditch, approximately 620 feet southeast of the release
area. The proposed location SW-A is shown on the attached drawing. In addition, one of the
facility’s routine surface water sampling points (SW-2) is located in the stormwater ditch near
proposed soil sample SS-6 because the ditch often holds standing water in this location. As
noted above, if the ditch has standing water at this or any of the other proposed shallow soil
sample locations, a surface water sample will be collected instead of a soil sample.

Groundwater Samples:
Since groundwater is shallow (about 11-14 feet deep), the county proposes to advance the
SB-1 boring to 3-5 feet below the water table to collect a groundwater sample from that location.
Also, monitoring well MW-17R is located immediately downgradient of the release area, so the
County will collect a groundwater sample from MW-17R as well.

Analyses and Comparison to Standards:
All soil, surface water, and groundwater samples will be analyzed for Appendix I volatile
organic compounds by EPA Method 8260B plus Appendix I metals by EPA Method 6010D.
The soil sample results will be compared to Preliminary Soil Remediation Goals (PSRGs) from
the NCDEQ Inactive Hazardous Sites Branch, including both the Industrial Health-based PSRG
and the Protection-of-Groundwater PSRG. The surface water results will be compared to the
North Carolina Surface Water Standards found in 15A NCAC 2B, and the groundwater results
will be compared to the North Carolina Groundwater Standards found in 15A NCAC 2L.

Schedule and Reporting:
The County proposes to collect the samples within 10 business days of NCDEQ approval
of this plan. The County will make every attempt possible to schedule the event on a day with
no precipitation. The results of the proposed sampling will be submitted to the NCDEQ in a
letter report within 30 calendar days of receipt of the final laboratory analytical report.

Ms. Jackie Drummond
July 28, 2017
Page 3 of 3

Please contact me at [phone] or [e-mail] if you have any
questions regarding this sampling plan. Thank you.

Sincerely,
JOYCE ENGINEERING

Van Burbach, Ph.D., P.G.
Senior Technical Consultant

Attachment: Drawing 1

cc: Steve Edge, Robeson County
Gene Walters, Robeson County
Amy Davis, Joyce Engineering

9731-F SOUTHERN PINE BLVD.CHARLOTTE, NC 28273 PHONE: [phone] NC CORP LIC: C-0782 0 (FEET)GRAPHIC SCALE 200 100 50820.1702.12ROBESON COUNTY LANDFILL ST. PAULS, NORTH CAROLINA 1AS SHOWNLEACHATE ASSESMENT PLANVBRWHVBVB07/17/17 PROJECT NO.APPROVED CHECKED DRAWN DESIGNED DATEDATEREVISIONS AND RECORD OF ISSUEBYNO APP CK SCALE All rights reserved.” Joyce Engineering, Inc.DRAWING NO.2017
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