2601_CumberlandCoMSW_LeachateAsmtRpt_DIN27651_20170331

5400 Glenwood Avenue, Suite 400
Raleigh, North Carolina 27612
tel: [phone]
fax: [phone]

March 31, 2017

Mr. Ervin Lane
North Carolina Department of Environmental Quality
Division of Waste Management
Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Subject: Results of Leachate Release Sampling Event
Cumberland County Subtitle D Landfill
Facility Permit No. 2601-MSWLF-1997
Dear Mr. Lane:
On behalf of the Cumberland County Office of Solid Waste Management, CDM Smith Inc. (CDM Smith)
is submitting an electronic copy of the sampling results regarding the leachate release from the
Cumberland County Subtitle D landfill. Ponded leachate was observed in the perimeter stormwater
ditch on February 21, 2017. The sampling plan was approved by the Solid Waste Section on March 2,
2017, and implemented on March 9, 2017.
Field Activities
Surface water and subsurface soil samples were collected on March 9, 2017, from the locations shown
on Figure 1 to evaluate potential impacts from the leachate release. Surface water samples were
collected from Sediment Ponds #1 and #5. The background sample (SW-2) was collected from the outfall of
Sediment Pond #1. Sediment Pond #5 was not discharging at the time of sampling therefore sample SW-1
was collected from within the pond near the outlet structure. Surface water samples were measured in the
field for pH, conductivity, temperature, and turbidity using a multi-parameter water quality meter and a
turbidity meter. The water quality parameters at the time of sampling are presented on Table 1.
Potentially impacted soil within the perimeter stormwater ditch was removed prior to field activities
commencing. Discrete soil samples within the stormwater ditch (SS-1 and SS-2) were collected
approximately 1 to 2 feet below ground surface (bgs) prior to the excavation being backfilled with
clean material to the original grade. A background sample (SS-3) was collected north of the Subtitle D
landfill at a depth of approximately 1 to 2 feet bgs. Soil samples analyzed for volatile organic compounds
(VOC) were collected with a laboratory supplied Teflon sampling device. Soil samples analyzed for metals
and pH were collected with a clean stainless steel spoon and placed in the laboratory provided container.

Mr. Ervin Lane
March 31, 2017
Page 2

Sampling Results
Environmental Conservation Laboratories, Inc. located in Cary, North Carolina, analyzed all samples
for Appendix I VOCs and metals. VOCs were analyzed by U.S. Environmental Protection Agency (EPA)
Method 8260B and metals by EPA Methods 6010D and 6020B. In accordance with SWS guidelines the
analytical results were reported to the laboratory specific method detection limit (MDL) and are
quantifiable at or below SWS Limits (SWSLs). All surface water and subsurface soil locations had
detections of analytes above the laboratory specific MDL, but below the SWSL. These detections were
qualified with “J” flags, which indicate an estimated concentration. The laboratory analytical data
reports are provided in Appendix A.
Surface Water Sampling
No metals or VOCs were detected in the surface water samples above the 15A NCAC 02B (NC 2B)
Surface Water Standards for Class C waters. The surface water analytical results are summarized in
Table 2.
Subsurface Soil Sampling
Subsurface soil analytical results were compared to the October 2016 Inactive Hazardous Sits Branch
Unrestricted Use Health-Based and Protection of Groundwater Preliminary Soil Remediation Goals
(PSRGs). Cobalt and vanadium in all samples exceeded their respective Protection of Groundwater
PSRG, but were below the Unrestricted Use Health-Based PSRG. Arsenic exceeded the Unrestricted
Use Health-Based PSRG, but was below the Protection of Groundwater PSRG in each sample. No VOCs
were detected above the PSRGs in any samples. Several VOCs were reported, however, all of them
were reported at very low-levels and are common laboratory contaminants. Based on previous soil
and groundwater investigations at the Cumberland County site, the reported metals are consistent
with naturally occurring background concentrations. Subsurface soil analytical results are summarized
in Table 3.
Quality Control/Quality Assurance
Upon collection, all samples were labeled and placed in a chilled cooler. Standard chain-of-custody
procedures were followed to document the handling of the samples. No analytes were detected in
the trip blanks. A duplicate surface water and subsurface soil sample were collected from SW-1 and
SS-1, respectively, for laboratory quality control. In general, the relative percent difference between
the parent and the duplicate samples showed good laboratory precision.
Conclusions
Arsenic, cobalt, and vanadium in the subsurface soil samples were the only analytes detected above
regulatory standards. With exception of vanadium in subsurface soil sample SS-2, all detections
exceeding the PSRGs were estimated concentrations (“J” Flags). Additionally, concentrations of metals
within the perimeter stormwater ditch were similar to background concentrations (SS-3). Based on a
visual inspection of the ditch and the results of the soil and surface water sampling, the leachate
release did not appear have an adverse impact on subsurface soils within the storwmater perimeter
ditch or downgradient surface waters.
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No
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1.

A
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.
2.

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3.

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v
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1
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Page 2 of 2
Figure 1Sampling LocationsCumberland County Ann Street LandfillMarch 2017.0 500 1,000250
Feet
Legend
!Subsurface Soil Sampling Location
#Surface Water Sampling Location
SedimentPond #5
Subtitle D Landfill
SedimentPond #1
C&D Landfill
Closed Unlined MSW Landfill
SS-3
SS-1
SS-2 #SW-1
#SW-2
Note: Samples collected on March 9, 2017.

Appendix A