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5400 Glenwood Avenue, Suite 400
Raleigh, North Carolina 27612
tel: 919 325-3500
fax: 919 781-5730
December 22, 2016
Ms. Jaclynne Drummond
North Carolina Department of
Environmental Quality
Division of Waste Management
Solid Waste Section
2090 U.S. 70 Highway
Swannanoa, North Carolina 28778
Subject: August 2016 Semi-Annual Groundwater Sampling Report
Dare County C&D Landfill
Dare County, North Carolina
Facility Permit Number 2803-CDLF-1995
Dear Ms. Drummond:
CDM Smith Inc., on behalf of Dare County, is submitting an electronic copy of the August 2016
semi-annual groundwater sampling event report. This letter report presents the results of the most
recent semi-annual sampling event that was completed at the Dare County C&D Landfill and
constitutes the second semi-annual sampling event for 2016. The approved groundwater monitoring
network consists of 13 wells (i.e. MW-1 (background well), -2, -3, -8, -9, -10, -11, -12, -13, -14, -15, -16,
and -17) and three surface water sampling locations (i.e. SW-1, -2, and -3). Field activities and
sampling results are discussed below.
Field Activities
Groundwater and surface water samples from the Dare County C&D Landfill were collected on August
16-17, 2016, by Environment One, Inc. (Environment One). Monitoring wells and surface water
sample locations are shown on Figure 1. Well construction details for the monitoring wells are
provided in Table 1.
Groundwater elevations were measured at each well prior to sampling using an electronic water level
indicator with an accuracy of 0.01 feet. These groundwater elevations as presented in Table 2 were
used to construct a potentiometric surface map for this sampling event. The potentiometric contours
are presented on Figure 1.
Each monitoring well was measured for pH, conductivity, temperature, turbidity, dissolved oxygen,
and oxidation-reduction potential (ORP) prior to sampling. The same water quality parameters were
Ms. Jaclynne Drummond
December 22, 2016
Page 2
measured at the surface water sample locations with the exception of ORP. The water quality
parameters at the time samples were collected are presented in Table 2.
Sampling Results
Environment One located in Greenville, North Carolina, analyzed the groundwater and surface water
samples for North Carolina Appendix I volatile organic compounds by U.S. Environmental Protection
Agency (EPA) Method 8260B, metals by EPA Methods 200.7, 200.8, and Standard Method (SM) 3113B,
mercury by EPA Method 245.1, alkalinity by SM 2320B, chloride and sulfate by SM 4500, and total
dissolved solids (TDS) by SM 2540C. In accordance with Solid Waste Section guidelines, the analytical
results were reported to the laboratory specific method detection limit (MDL) and are quantifiable at
or below Solid Waste Section Limits (SWSLs). All monitoring wells and surface water sample locations
for the C&D Landfill had detections of analytes above the MDL but below SWSLs. These detections
were qualified with “J” flags, which indicate an estimated concentration.
The following list presents the analytes detected above the MDL at each sample location. No “J” flag
detections are provided. Underlined analytes exceeded the 15A NCAC 02L .0202 (NC 2L) Groundwater
Quality Standard, Groundwater Protection Standard, or the 15A NCAC 02B Surface Water Quality
Standard for Class C Waters. A complete summary of all detected and estimated concentrations for
the August 2016 sampling event is presented in Table 3. Analytical results for TDS are provided in
Table 2. The laboratory analytical report is provided in Appendix A.
MW-1
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: Tetrahydrofuran
MW-2
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
MW-3
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
Ms. Jaclynne Drummond
December 22, 2016
Page 3
MW-8
General Chemistry: Alkalinity, Chloride
Metals: Barium, Iron, Manganese
Volatile Organic Compounds: None Detected
MW-9
General Chemistry: Alkalinity, Chloride
Metals: Arsenic, Chromium, Iron, Zinc
Volatile Organic Compounds: None Detected
MW-10
General Chemistry: Alkalinity, Chloride
Metals: Arsenic, Iron, Manganese
Volatile Organic Compounds: None Detected
MW-11
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
MW-12
General Chemistry: Alkalinity, Chloride
Metals: Iron
Volatile Organic Compounds: None Detected
MW-13
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
MW-14
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
MW-15
General Chemistry: Alkalinity, Chloride
Metals: Arsenic, Iron, Manganese, Zinc
Volatile Organic Compounds: None Detected
Ms. Jaclynne Drummond
December 22, 2016
Page 4
MW-16
General Chemistry: Alkalinity, Chloride
Metals: Barium, Iron, Manganese
Volatile Organic Compounds: None Detected
MW-17
General Chemistry: Chloride
Metals: Iron, Zinc
Volatile Organic Compounds: None Detected
SW-1
General Chemistry: Alkalinity, Chloride
Metals: Iron
Volatile Organic Compounds: None Detected
SW-2
General Chemistry: Alkalinity, Chloride
Metals: Iron
Volatile Organic Compounds: None Detected
SW-3
General Chemistry: Alkalinity, Chloride
Metals: Iron, Manganese
Volatile Organic Compounds: None Detected
“J” flags were not included in the previous list, but several locations had “J” flag detections that
exceeded the standards. The “J” flag constituents above the standards along with their locations are
listed below.
Cobalt: MW-9 and -11
Lead: SW-2 and -3
Vanadium: MW-1, -2, -3, -8, -9, -10, -11, -12, -13, -14, -15, -16, and -17
Equipment and trip blanks were analyzed for quality control. A duplicate sample was also collected for
quality control. No analytes were detected in the trip blank. The equipment blank had “J” flag
detections of iron and manganese below their respective NC 2L Standard. Duplicate samples collected
from MW-3 had analytes detected at similar concentrations to the parent samples.
Ms. Jaclynne Drummond
December 22, 2016
Page 5
Metals and general chemistry analytes exceeding the standards are likely naturally occurring based on
detections in the background monitoring well MW-1. Elevated turbidity at the time of sample
collection may also influence metal concentrations.
The semi-annual groundwater monitoring program will be continued by Dare County. The first semi-
annual sampling event for 2017 is tentatively scheduled for February.
If you have any questions or require further explanation, do not hesitate to call me at (919) 325-3569.
Very truly yours,
Mathew F. Colone, P.G.
CDM Smith Inc.
Attachments
cc: Edward Mann, Dare County
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General Chemistry
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December 2016
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Pa
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7
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7
December 2016
Appendix A
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