HomeMy WebLinkAbout9226_ShotwellCDLF_GWMReport_DIN26398_20151206Groundwater Monitoring Report
December 2015 Semi-Annual Monitoring Event
Shotwell Construction and Demolition Debris Landfill
Wake County, North Carolina
NC Solid Waste Permit No. 92-26
Prepared for:
Shotwell Landfill, Inc.
4724 Smithfield Road
Wendell, North Carolina
Prepared by:
ELM Site Solutions, Inc.
P.O. Box 97607
Raleigh, North Carolina 27624
919-792-3733
January 2016
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TABLE OF CONTENTS
1.0 Introduction
2.0 Field Methods
2.1 Groundwater and Surface Water Monitoring
2.2 Landfill Gas Monitoring
3.0 Field and Analytical Results
3.1 Groundwater Results
3.2 Surface Water Results
3.3 Landfill Gas Results
4.0 Groundwater Characterization
5.0 Summary and Conclusions
Tables
1 Monitoring Well Construction Data and Groundwater Elevations –December 14, 2015
2 Stabilized Groundwater Field Parameter Measurements – December 15 and 16, 2015
3 Summary of Analytical Results – December 15 and 16, 2015
4 Historical Landfill Gas Monitoring Data
5 Groundwater Velocity Data
Figures
1 Water Table Contour Map – December 14, 2015
Appendices
A Field Sample Collection Records
B Laboratory Analytical Report
C Landfill Gas Monitoring Data Forms (September and December 2015)
3
1.0 Introduction
On December 15 and 16, 2015, groundwater and surface water monitoring was completed at
the Shotwell Construction and Demolition Debris Landfill in Wendell, North Carolina. This
monitoring event satisfies requirements of the detection monitoring program under Solid Waste
Permit No. 92-26 and Solid Waste Regulations 15A NCAC 13B .0544. The following report
summarizes sampling procedures, field and laboratory results and groundwater characterization
as required by North Carolina Solid Waste Regulations. The North Carolina Department of
Environmental Quality (NCDEQ) Environmental Monitoring Reporting Form is included with the
document.
In addition to groundwater and surface water monitoring, 11 landfill gas monitoring wells (LG-1
through LG-11) were monitored in September and December 2015 to satisfy requirements in
the facility’s Solid Waste Permit. In June 2014, landfill gas well LG-8 was abandoned and
replaced with LG-8R by Garrett & Moore. LG-8R is located in close proximity to groundwater
monitoring well MW-1A. Landfill gas monitoring results are also summarized herein.
2.0 Field Methods
2.1 Groundwater and Surface Water Monitoring
Groundwater gauging and sampling was completed at eight (8) monitoring wells (MW-1A, MW-
3A, MW-4S, MW-4D, MW-5, MW-6, MW-7 and MW-8). Surface water sampling was completed
at three (3) established locations (SW-1, SW-2, and SW-3). Groundwater and surface water
monitoring locations are shown on Figure 1.
During the monitoring event, the wells were inspected for signs of damage or unusual
conditions. The wells were found to be in good condition and free of obstructions.
Low-flow (micro-purge) sampling procedures were used for well purging and groundwater
sampling during the December 2015 sampling event, except for well MW-1A. The sample
collection process was consistent with industry standard practices. The monitoring wells were
gauged with a decontaminated electric water level meter to determine the depth to groundwater
and then micro-purged at a rate of approximately 100 to 300 milliliters per minute using new
disposable tubing attached to a peristaltic pump. A disposable bailer was used to purge and
sample well MW-1A because the depth to water exceeded the maximum depth capability of the
peristaltic pump. Well MW-1A was purged until essentially dry.
A summary of well construction, depth to groundwater and groundwater elevation data is
provided in Table 1.
Field parameters consisting of temperature, pH, specific conductivity, turbidity, dissolved oxygen
(DO), and oxidation-reduction potential (ORP) were measured at regular (i.e., approximate three
(3) to five (5) minute) intervals using a Horiba Model U-5000 Multi-parameter Water Quality
Analyzer and flow-through cell during micro-purging until parameters stabilized to within
approximately 10%. Field parameters were measured at well MW-1A following the removal of
each well volume of water until parameters stabilized.
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Groundwater samples were collected in laboratory containers provided by Environmental
Conservation Laboratories (ENCO, a North Carolina certified laboratory) for Appendix I volatile
organic compounds (VOCs) by United States Environmental Protection Agency (EPA) Method
8260B, Appendix I metals by EPA Methods 6010C/6020A, mercury by EPA Method 7470A,
chloride and sulfate by EPA Method 300.0, total alkalinity by EPA Method 310.2 and total
dissolved solids (TDS) by SM 2540C. Surface water samples were submitted to ENCO for
Appendix I VOCs and 15 metals. Samples were transported to the laboratory under chain-of-
custody protocols and analyzed at or below the specified NCDEQ Solid Waste Section Limits
(SWSLs). Sample collection record sheets are provided in Appendix A.
2.2 Landfill Gas Monitoring
Eight (8) landfill gas monitoring wells (LG-1 through LG-8) were installed at the site in June
2011 as presented in the Spring 2011 Groundwater Monitoring Report. Three (3) additional
landfill gas monitoring wells (LG-9, LG-10, and LG-11) were installed at the site in October 2012
as sentinel downgradient wells for LG-3 and LG-4 that had registered elevated methane levels.
In June 2014, landfill gas well LG-8 was abandoned and replaced with LG-8R located near
groundwater monitoring well MW-1A. Landfill gas monitoring well locations are shown on
Figure 1.
Landfill gas quarterly monitoring events were conducted on September 16, 2015, and
December 14, 2015, during this reporting period. Percent lower explosive limit (% LEL)
measurements and other applicable parameters (i.e., % methane by volume, % oxygen and %
carbon dioxide) were recorded at the landfill gas monitoring wells using a laboratory calibrated
LandTec GEM 2000 instrument.
3.0 Field and Analytical Results
3.1 Groundwater Results
As noted in Section 2 above, field parameters including temperature, pH, specific conductivity,
turbidity, DO and ORP were measured and recorded during well purging activities. Stabilized
field parameter measurements are provided in Table 2 along with the approximate total volume
of water purged.
Groundwater analytical results indicated that the only VOC detected above the 15A NCAC 2L
Standard (North Carolina Groundwater Quality Standard, or Interim Maximum Allowable
Concentration, hereinafter referred to as the 2L Standard) was tetrahydrofuran at a
concentration of 1.4 micrograms per liter (ug/l) at well MW-4D.
Several metals were detected above their respective 2L Standard as follows:
Cobalt:MW-6, MW-7 and MW-8. The samples collected from MW-7 and MW-8 had detections
above the 2L Standard, but were estimated concentrations (“J” flagged) indicating the reported
concentration was between the method detection limit (MDL) and the method reporting limit
(MRL).
Iron:MW-1A, MW-4S, MW-6, and MW-8.
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Manganese:MW-4S, MW-4D, MW-6, and MW-8.
Vanadium:MW-1A and MW-8. Both detections were estimated (“J” flagged) values.
No additional target compounds were detected in the groundwater samples that exceeded the
2L Standards. No 2L Standards are established for total alkalinity. Groundwater analytical
results are summarized in Table 3 and the laboratory analytical report is provided in Appendix
B.
For quality assurance/quality control, a trip blank accompanied the samples and a duplicate
sample (Duplicate) was collected at well MW-4S. The duplicate results compared favorably with
the MW-4S results. The trip blank did not contain any VOCs above the laboratory MDL.
3.2 Surface Water Results
Surface water analytical results indicated that no VOCs were detected in the samples collected
above their respective 15A NCAC 2B Surface Water Standard (hereinafter referred to as the 2B
Standards, or National Criteria per EPA).
For metals, cobalt was detected at an estimated concentration (“J” flagged) in the sample
collected at SW-1, and vanadium was detected at estimated concentrations (“J” flagged) in the
samples collected at SW-1 and SW-3. No 2B Standard has been established for vanadium and
therefore, by default, a detected concentration is considered above the standard. Surface water
analytical results are summarized in Table 3 and the laboratory analytical report is provided in
Appendix B.
3.3 Landfill Gas Results
As noted above, quarterly landfill gas monitoring events were conducted on September 16,
2015, and December 14, 2015, at 11 landfill gas wells and the scale house during the reporting
period. Wells LG-3 and LG-4 exhibited greater than 100% of the lower explosive limit (LEL)
during the reporting period (i.e., 330% and 252% LEL at LG-3 in September and December,
respectively, and 472% and 558% LEL at LG-4 in September and December, respectively).
Percent LEL measurements recorded at downgradient sentinel wells LG-9, LG-10, and LG-11
exhibited 0% LEL during the reporting period. Replacement well LG-8R exhibited 35% and 27%
LEL during the reporting period. Landfill Gas Monitoring Data Forms for the reporting period are
provided in Appendix C. Historical landfill gas monitoring data are summarized in Table 4.
4.0 Groundwater Characterization
A water table contour map was prepared from the well gauging data collected on December 14,
2015, as shown on Figure 1. According to the figure, shallow groundwater continues to migrate
generally toward the southwest as historically observed. The data also indicates shallow
groundwater flow in the central portion of the site is generally toward the south and the
intermittent stream on-site.
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The horizontal groundwater velocity was estimated from a previously calculated hydraulic
conductivity value at well MW-5 using the equation V = KI/n where:
V = estimated horizontal velocity
K = calculated hydraulic conductivity from slug testing
I = estimated shallow hydraulic gradient
n = estimated effective porosity
The estimated shallow groundwater velocity ranged from 0.016 feet/day south of the intermittent
stream to 0.068 feet/day north of the intermittent stream as shown on Figure 1 and Table 5.
5.0 Summary and Conclusions
The only VOC detected in groundwater above the 2L Standard was tetrahydrofuran at well MW-
4D. The 2L Standard for tetrahydrofuran has not been established and is, by default,
considered above the standard. Tetrahydrofuran was detected at a similar concentration (1.0
ug/l) in December 2014. These two (2) detections are the only detections in the past five (5)
years at MW-4D.
No VOCs were detected in surface water above their respective 2B Standards.
Four (4) inorganic analytes (cobalt, iron, manganese, and vanadium) were detected at
concentrations at or above the 2L Standard in groundwater at the site as follows:
x Cobalt – MW-6, MW-7 and MW-8 (MW-7 and MW-8 at estimated values);
x Iron – MW-1A, MW-4S, MW-6 and MW-8;
x Manganese – MW-4S, MW-4D, MW-6 and MW-8;
x Vanadium – MW-1A and MW-8 (both at estimated values).
Detections of these inorganic analytes are consistence with site historical data and believed to
be originating from natural conditions.
Cobalt was detected in surface water sample SW-1, and vanadium was detected in surface
water samples SW-1 and SW-3. These detections were estimated (‘J’)values. A 2B Standard
has not been established for vanadium and, therefore, any detected concentration is considered
to be above the standard. Cobalt has historically been detected at SW-1 at estimated values.
Vanadium has historically been detected at these two (2) surface water locations at estimated
values.
As anticipated with the use of low-flow sampling techniques, the turbidity values during this
sampling event were zero (0) Nephelometric Turbidity Units (NTUs)for the seven (7) low-flow
purged wells, thereby minimizing suspended solids in the samples. The turbidity value for well
MW-1A that was purged and sampled with a bailer was 160 NTUs.
Elevated % LEL readings continue to be observed at wells LG-3 and LG-4. The % LEL at LG-3
increased to above 100% in December 2014 and again in June 2015 after being at or below
54% since January 2013. The September and December 2015 values are similar to the June
2015 value (i.e., 330% and 252%). The % LEL at LG-4 appears to be generally stable since
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November 2012 (i.e., fluctuating between 468% and 806%). The downgradient sentinel landfill
gas wells for LG-3 and LG-4 continue to indicate that off-site migration of landfill gas is not
occurring. Percent LEL measurements obtained from downgradient wells LG-9, LG-10, and LG-
11 remained at zero during the reporting period.
Quarterly landfill gas monitoring will continue at the site with the next two (2) events scheduled
for March and June 2016. Semi-annual groundwater monitoring will continue at the site with the
next event scheduled for June 2016.
FIGURES
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WATER TABLE CONTOUR MAP - DECEMBER 14, 2015
WENDELL - WAKE COUNTY
SHOTWELL C&D LANDFILL
PLAN REVISIONS
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ELM Site Solutions, Inc.
P.O. BOX 97607
Raleigh, North Carolina 27624
Phone: (919) 792-3733
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NO.DATE DESCRIPTION
4724 SMITHFIELD ROAD
NORTH CAROLINA
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NC SOLID WASTE PERMIT NO. 92-26
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TABLES
MW-1A 09/27/06 28 - 38 2" PVC 268.58 41.2 35.75 232.83
MW-3A 02/21/07 10 - 20 2" PVC 224.41 33.0 14.49 209.92MW-4S 03/08/01 10 - 25 2" PVC 220.87 32.0 23.36 197.51
MW-4D 03/07/01 39 - 49 2" PVC 220.87 52.4 23.36 197.51
MW-5 03/06/01 4 - 19 2" PVC 216.66 22.3 7.23 209.43
MW-6 02/21/07 15 - 25 2" PVC 239.45 33.2 21.58 217.87
MW-7 03/01/11 16 - 26 2" PVC 248.73 28.6 12.95 235.78MW-8 11/06/13 16 - 26 2" PVC 264.20 29.0 14.89 249.31
Notes:
ft BGS = Feet below ground surface.
ft BTOC = Feet below top of casing.
ft MSL = Feet above mean sea level.
NM = Not measured.
Shotwell Construction & Demolition Debris Landfill
Table 1
Monitoring Well Construction Data and Groundwater Elevations
December 14, 2015
Measured
Total Depth
(ft BTOC)
Depth to
Water
(ft BTOC)
Water Level
Elevation
(ft MSL)
Well ID Date
Constructed
Screen Interval
per Well Logs
(ft BGS)
Top of Casing
Elevation
(ft MSL)
Well Diameter
and Material
Wendell, North Carolina
Table 2
Stabilized Groundwater Field Parameter Measurements
MW-1A*3.25 18.3 5.63 0.040 160.0 11.13 207
MW-3A 1.0 15.7 4.71 0.055 0.0 4.39 253
MW-4S 1.25 17.7 5.22 0.174 0.0 0.77 55
MW-4D 1.75 17.7 5.56 0.336 0.0 0.99 203
MW-5 1.5 17.3 5.18 0.070 0.0 0.91 542
MW-6 1.25 16.3 4.94 0.075 0.0 0.02 84
MW-7 1.5 16.1 4.56 0.052 0.0 0.21 565MW-8 1.5 16.8 6.02 0.167 0.0 1.38 205
Notes:
C = Degrees celsius.
STU = Standard units.
mS/cm = Millisiemens per centimeter.
NTU = Nephelometric Turbidity Units.
mg/L = Milligrams per liter.
mV = Millivolts.
Shotwell Construction & Demolition Debris Landfill
December 15 and 16, 2015
Sample ID Temperature
(degrees C)pH (STU)
Oxidation
Reduction
Potential (mV)
Specific
Conductivity
(mS/cm)
Wendell, North Carolina
Turbidity (NTU)
Dissolved
Oxygen
(mg/L)
Volume
Purged
(Gallons)
MW-1A MW-3A MW-4S
Duplicate
(MW-4S)MW-4D MW-5 MW-6 MW-7 MW-8 SW-1 SW-2 SW-3
Barium 100 700 1000 74.2 J 90.2 J 86.6 J 84.4 J 182 32.9 J 177 40.9 J 67.2 J 66.7 J 42.9 J 77.8 JBeryllium146.5 0.899 J 1.74 0.357 J 0.318 J 0.207 J 0.478 J 1.9 0.230 J <0.100 <0.100 <0.100 <0.100
Cadmium 1 2 2 <0.360 0.375 JB <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360 <0.360ChlorideNE250,000 230,000 3700 J 4100 J 6400 NA 14,000 4500 J 3600 J 5800 6700 NA NA NA
Cobalt 10 1 3 <1.10 <1.10 <1.10 <1.10 <1.10 <1.10 18.9 2.14 J 1.40 J 3.19 J <1.10 1.86 JCopper10100072.66 J <1.60 <1.60 <1.60 <1.60 <1.60 <1.60 <1.60 <1.60 <1.60 <1.60 <1.60Iron30030010001560<22.0 1230 1160 99.9 J 32.1 J 3440 <22.0 828 NA NA NA
Manganese 50 50 200 19.0 J 22.9 J 67.6 64.7 209 26.4 J 600 22.8 J 80.4 NA NA NAMercury0.2 1 0.012 <0.170 <0.170 <0.170 <0.170 <0.170 <0.170 0.509 <0.170 <0.170 NA NA NA
Nickel 50 100 25 <1.80 <1.80 <1.80 <1.80 <1.80 <1.80 3.02 J <1.80 2.12 J <1.80 <1.80 <1.80Sulfate as SO4 250,000 250,000 250,000 <2900 15,000 J 48,000 J NA 100,000 JD <2900 <2900 <2900 16,000 J NA NA NA
Tetrahydrofuran NE NE NE <0.80 <0.80 <0.80 <0.80 1.4 <0.80 <0.80 <0.80 <0.80 <0.80 <0.80 <0.80Thallium5.5 0.2 0.24 0.147 J <0.110 <0.110 <0.110 <0.110 <0.110 0.141 J <0.110 <0.110 <0.110 <0.110 <0.110
Total Alkalinity as CaCO3 NE NE NE 16,000 15,000 46,000 NA 85,000 34,000 41,000 15,000 79,000 NA NA NA
Total Dissolved Solids NE 500,000 NE <50,000 58,000 140,000 NA 300,000 60,000 <50,000 <50,000 190,000 NA NA NAVanadium250.3 NE 3.38 J <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 <1.40 5.55 J 2.11 J <1.40 3.95 JZinc1010005010.5 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80 <3.80
Notes:
All units in micrograms per liter (ug/l).
NC SWSL = NC Solid Waste Section Limit.
NCAC 2L Standard = NC Groundwater Quality Standard, or Interim Maximum Allowable Concentration.
NCAC 2B Standard = NC Surface Water Quality Standard, or National Criteria per EPA.
NE = Not established.
"<" = Concentration is less than indicated method detection limit.
NA = Not analyzed.
J = Value is between method detection limit and method reporting limit.
B = Detected in associated method blank.
D = Sample was analyzed at dilution.
Shaded/bolded values are at or above the NC 2L Standard for groundwater, or the NC 2B Standard for surface water.
Sample ID
Table 3
Summary of Analytical ResultsShotwell Construction & Demolition Debris Landfill
December 15 and 16, 2015Wendell, North Carolina
Detected Constituents NC SWSL
NCAC 2L
Standard,
or IMAC
NCAC 2B
Standard,
or EPA Surface WaterGroundwater
Table 4
Historical Landfill Gas Monitoring DataShotwell Construction Demolition Landfill Wendell, North Carolina
Page 1 of 3
Sample Sample Sample Sample Tube Time % CH4LocationDateTimePurge (sec.)Pumped (sec.)By Volume7/14/2011 1100 >60 >60 0.0 0.0 21.0 0.110/11/2011 1040 >60 >60 0.0 0.0 20.7 0.012/8/2011 1400 >60 >60 0.0 0.0 21.0 0.13/8/2012 1125 >60 >60 0.0 0.0 20.8 0.26/12/2012 1600 >60 >60 0.0 0.0 20.3 0.112/7/2012 1000 >60 >60 0.0 0.0 21.4 0.29/18/2013 1130 >60 >60 0.0 0.0 19.9 0.112/17/2013 1220 >60 >60 0.0 0.0 20.8 0.13/11/2014 1035 >60 >60 0.0 0.0 20.7 0.16/3/2014 1240 >60 >60 0.0 0.0 19.9 0.19/17/2014 1105 >60 >60 0.0 0.0 20.7 0.112/15/2014 1225 >60 >60 0.0 0.0 21.0 0.13/31/2015 1330 >60 >60 0.0 0.0 21.1 0.06/23/2015 1000 >60 >60 0.0 0.0 21.0 0.19/16/2015 1305 >60 >60 0.0 0.0 20.2 0.112/14/2015 1125 >60 >60 0.0 0.0 20.4 0.2
6/20/2011 1150 >60 >120 0.1 2.0 14.9 7.410/11/2011 1105 >60 >120 0.0 0.0 14.3 8.212/8/2012 1440 >60 >120 0.0 0.0 15.2 8.73/8/2012 1150 >60 >120 0.2 5.0 15.1 8.26/12/2012 1215 >60 >60 0.0 0.0 8.1 13.76/18/2012 1030 >60 >60 0.0 0.0 14.1 8.911/19/2012 1130 >60 >60 0.0 0.0 21.6 0.012/7/2012 850 >60 >60 0.0 0.0 13.6 9.16/27/2013 1045 >60 >60 0.2 3.0 12.8 9.19/18/2013 1155 >60 >60 0.0 0.0 12.6 9.312/17/2013 1515 >60 >60 0.1 2.0 14.4 8.53/11/2014 1210 >60 >60 0.0 0.0 14.0 7.46/3/2014 1510 >60 >60 0.0 0.0 13.0 7.19/17/2014 1130 >60 >60 0.0 0.0 11.6 9.612/15/2014 1310 >60 >60 0.0 0.0 11.7 10.33/31/2015 1245 >60 >60 0.0 0.0 12.2 8.86/23/2015 1050 >60 >60 0.0 0.0 11.2 10.69/16/2015 1220 >60 >60 0.0 0.0 10.4 11.912/14/2015 1340 >60 >60 0.0 1.0 7.4 14.1
6/20/2011 1210 >60 >120 0.3 6.0 8.0 11.010/11/2011 1122 >60 >120 0.4 8.0 3.8 17.712/8/2011 1500 >60 >120 0.0 0.0 5.2 17.03/8/2012 1210 >60 >120 0.2 4.0 6.8 15.26/12/2012 1200 >60 >60 0.0 0.0 4.0 17.66/18/2012 1020 >60 >60 0.0 0.0 3.6 18.811/19/2012 1140 >60 >60 0.0 0.0 7.4 14.512/7/2012 900 >60 >60 0.0 0.0 4.5 17.36/27/2013 1035 >60 >60 0.1 2.0 4.0 16.59/18/2013 1210 >60 >60 0.0 0.0 16.7 3.312/17/2013 1500 >60 >60 0.0 0.0 5.3 16.63/11/2014 1205 >60 >60 0.0 0.0 7.1 13.36/3/2014 1520 >60 >60 0.0 0.0 3.6 14.69/17/2014 1135 >60 >60 0.0 0.0 2.7 18.712/15/2014 1320 >60 >60 0.0 0.0 2.9 18.43/31/2015 1230 >60 >60 0.0 0.0 5.2 14.56/23/2015 1100 >60 >60 0.0 0.0 3.7 17.09/16/2015 1125 >60 >60 0.0 0.0 4.5 18.412/14/2015 1348 >60 >60 0.0 0.0 3.1 18.3
6/20/2011 1223 >60 >120 0.5 9.0 12.1 3.110/11/2011 1138 >60 >120 2.0 40.0 3.3 10.112/8/2011 1515 >60 >120 0.0 1.0 21.0 0.43/8/2012 1230 >60 >120 2.1 42.0 6.1 9.36/12/2012 1100 >60 >60 5.5 110 0.7 12.06/18/2012 1010 >60 >60 5.8 116 0.7 13.26/21/2012 915 >60 >60 5.6 112 0.6 12.56/22/2012 925 >60 >60 5.9 118 0.7 12.78/23/2012 1555 >120 >120 2.4 48.0 9.8 8.110/16/2012 1125 >120 >120 3.8 76.0 10.1 8.211/19/2012 1111 >60 >60 3.8 76.0 6.7 11.712/7/2012 905 >60 >60 6.9 138 0.5 15.71/22/2013 1130 >60 >60 2.7 54.0 0.9 14.92/15/2013 1135 >60 >60 2.4 49.0 2.3 14.33/15/2013 1020 >60 >60 0.0 0.0 20.6 0.64/17/2013 1000 >60 >60 0.0 0.0 20.6 0.06/27/2013 1020 >60 >60 0.9 19.0 1.5 16.49/18/2013 1220 >60 >60 0.6 13.0 17.2 2.612/17/2013 1450 >60 >60 1.1 22.0 15.4 5.33/11/2014 1225 >60 >60 0.0 1.0 16.4 3.36/3/2014 1555 >60 >60 0.7 14.0 13.7 4.99/17/2014 1145 >60 >60 1.3 27.0 15.0 5.112/15/2014 1340 >60 >60 6.0 120 0.0 20.43/31/2015 1200 >60 >60 0.0 0.0 6.0 13.76/23/2015 1120 >60 >60 12.6 252 0.0 19.89/16/2015 1140 >60 >60 16.5 330 0.0 24.012/14/2015 1415 >60 >60 12.6 252 0.0 24.0
6/20/2011 1234 >60 >120 0.2 4.0 18.7 1.110/11/2011 1153 >60 >120 0.0 0.0 18.7 2.912/8/2011 1530 >60 >120 0.2 4.0 16.0 5.6
% LEL % O2 % CO2
Scale House
LG-1
LG-2
LG-3
Table 4
Historical Landfill Gas Monitoring DataShotwell Construction Demolition Landfill Wendell, North Carolina
Page 2 of 3
Sample Sample Sample Sample Tube Time % CH4LocationDateTimePurge (sec.)Pumped (sec.)By Volume % LEL % O2 % CO2
3/8/2012 1250 >60 >120 1.2 24.0 2.7 11.66/12/2012 1030 >60 >60 12.6 252 0.1 13.26/18/2012 1000 >60 >60 12.9 258 0.4 14.16/21/2012 930 >60 >60 11.5 230 1.8 12.26/22/2012 940 >60 >60 8.5 170 7.6 8.18/23/2012 1535 >120 >120 20.9 418 0.0 16.310/16/2012 1255 >120 >120 7.2 144 15.7 4.411/19/2012 1200 >60 >60 27.4 548 21.3 15.312/7/2012 940 >60 >60 39.5 790 0.5 15.01/22/2013 1140 >60 >60 29.4 588 0.4 14.12/15/2013 1055 >60 >60 29.6 594 0.2 14.23/15/2013 1010 >60 >60 31.7 634 0.0 14.54/17/2013 1020 >60 >60 23.4 468 4.7 10.86/27/2013 1100 >60 >60 34.0 680 0.1 18.09/18/2013 1310 >60 >60 38.3 766 0.0 21.612/17/2013 1430 >60 >60 40.3 806 0.0 19.93/11/2014 1235 >60 >60 30.1 602 1.4 16.16/3/2014 1625 >60 >60 29.4 588 0.0 20.29/17/2014 1210 >60 >60 37.5 750 0.0 26.412/15/2014 1405 >60 >60 37.0 740 0.0 23.93/31/2015 1115 >60 >60 27.8 556 0.6 20.76/23/2015 1150 >60 >60 32.8 656 0.1 25.49/16/2015 1210 >60 >60 23.6 472 0.0 29.012/14/2015 1435 >60 >60 27.9 558 0.0 27.9
6/20/2011 1410 >60 >120 0.0 0.0 16.7 4.410/11/2011 1212 >60 >120 0.3 5.0 16.0 5.412/8/2011 1545 >60 >120 0.0 0.0 16.9 5.43/8/2012 1310 >60 >120 0.0 0.0 16.6 5.06/12/2012 900 >60 >60 0.0 0.0 16.0 5.36/18/2012 1100 >60 >60 0.0 0.0 16.5 5.511/19/2012 1055 >60 >60 0.0 0.0 20.5 2.212/7/2012 950 >60 >60 0.0 0.0 16.9 5.26/27/2013 955 >60 >60 0.2 3.0 16.1 5.29/18/2013 1320 >60 >60 0.0 0.0 15.2 5.812/17/2013 1355 >60 >60 0.0 1.0 15.8 9.03/11/2014 1130 >60 >60 0.0 0.0 15.5 5.36/3/2014 1655 >60 >60 0.0 0.0 14.7 5.29/17/2014 1220 >60 >60 0.0 0.0 14.2 6.312/15/2014 1425 >60 >60 0.0 0.0 14.6 6.93/31/2015 1100 >60 >60 0.0 0.0 13.9 6.86/23/2015 1155 >60 >60 0.0 0.0 13.8 6.19/16/2015 1230 >60 >60 0.0 0.0 14.7 6.612/14/2015 1253 >60 >60 0.0 0.0 13.7 7.1
6/20/2011 1423 >60 >120 0.0 0.0 15.9 3.510/11/2011 1230 >60 >120 0.0 0.0 13.8 7.312/8/2011 1655 >60 >120 0.0 0.0 15.0 7.33/8/2012 1325 >60 >120 0.0 0.0 15.6 5.96/12/2012 1400 >60 >60 0.0 0.0 14.9 6.36/18/2012 1115 >60 >60 0.0 0.0 15.6 6.811/19/2012 950 >60 >60 0.0 0.0 21.4 6.312/7/2012 1005 >60 >60 0.0 0.0 18.0 4.26/27/2013 1035 >60 >60 0.2 3.0 14.9 6.49/18/2013 1335 >60 >60 0.0 0.0 16.6 4.812/17/2013 1230 >60 >60 0.0 0.0 15.6 5.83/11/2014 1045 >60 >60 0.0 0.0 15.2 5.96/3/2014 1250 >60 >60 0.0 0.0 13.4 6.99/17/2014 1225 >60 >60 0.0 0.0 11.5 9.112/15/2014 1235 >60 >60 0.0 0.0 14.6 6.93/31/2015 1330 >60 >60 0.0 0.0 13.2 17.56/23/2015 1400 >60 >60 0.0 0.0 12.3 8.29/16/2015 1300 >60 >60 0.0 0.0 11.9 8.912/14/2015 1132 >60 >60 0.0 0.0 11.9 9.0
6/20/2011 1437 >60 >120 0.0 0.0 13.0 3.110/11/2011 1355 >60 >120 0.8 17.0 10.0 6.912/8/2011 1635 >60 >120 0.0 0.0 10.9 6.63/8/2012 1335 >60 >120 0.0 0.0 9.0 6.76/12/2012 1500 >60 >60 0.0 0.0 7.0 8.86/18/2012 1130 >60 >60 0.0 0.0 7.6 9.111/19/2012 1010 >60 >60 0.0 0.0 18.0 2.412/7/2012 1035 >60 >60 0.0 0.0 11.7 6.26/27/2013 830 >60 >60 0.2 3.0 3.2 12.69/18/2013 1350 >60 >60 0.0 0.0 3.3 12.912/17/2013 1245 >60 >60 0.1 1.0 6.7 10.03/11/2014 1100 >60 >60 0.7 14.0 1.2 13.86/3/2014 1310 >60 >60 0.3 7.0 0.0 14.89/17/2014 1235 >60 >60 0.7 15.0 0.2 16.212/15/2014 1435 >60 >60 0.7 15.0 0.0 17.33/31/2015 1315 >60 >60 1.3 27.0 0.5 15.16/23/2015 1345 >60 >60 1.5 29.0 0.1 16.29/16/2015 1250 >60 >60 1.0 20.0 0.0 18.412/14/2015 1141 >60 >60 1.7 35.0 0.0 18.7
6/20/2011 1500 >60 >120 0.0 1.0 15.1 3.510/11/2011 1420 >60 >120 1.3 27.0 11.9 8.512/8/2011 1615 >60 >120 0.1 3.0 13.6 8.7
LG-4
LG-5
LG-6
LG-7
Table 4
Historical Landfill Gas Monitoring DataShotwell Construction Demolition Landfill Wendell, North Carolina
Page 3 of 3
Sample Sample Sample Sample Tube Time % CH4LocationDateTimePurge (sec.)Pumped (sec.)By Volume % LEL % O2 % CO2
3/8/2012 1350 >60 >120 0.4 9.0 11.1 8.46/12/2012 1530 >60 >60 0.3 6.0 9.8 10.76/18/2012 1145 >60 >60 0.3 6.0 9.8 10.711/19/2012 1045 >60 >60 0.3 6.0 12.8 8.912/7/2012 1020 >60 >60 0.4 8.0 11.3 9.46/27/2013 930 >60 >60 0.4 8.0 7.5 11.19/18/2013 1440 >60 >60 0.2 4.0 7.5 10.612/17/2013 1300 >60 >60 0.1 2.0 8.5 10.03/11/2014 1110 >60 >60 0.0 1.0 7.0 11.16/3/2014 1330 >60 >60 0.0 0.0 5.7 11.5
9/17/2014 1305 >60 >60 0.0 0.0 17.0 1.012/15/2014 1450 >60 >60 0.0 0.0 6.1 7.63/31/2015 1300 >60 >60 0.0 0.0 6.4 7.36/23/2015 1335 >60 >60 0.8 15.0 0.3 10.59/16/2015 1240 >60 >60 1.7 35.0 0.4 12.012/14/2015 1210 >60 >60 1.3 27.0 1.1 13.2
10/16/2012 1135 >120 >120 0.0 0.0 17.5 3.711/19/2012 1130 >60 >60 0.0 0.0 20.6 1.612/7/2012 915 >60 >60 0.0 0.0 17.3 4.61/22/2013 1125 >60 >60 0.0 0.0 17.4 4.32/15/2013 1040 >60 >60 0.0 0.0 16.6 4.73/15/2013 1025 >60 >60 0.0 0.0 16.7 4.64/17/2013 950 >60 >60 0.0 0.0 15.6 4.76/27/2013 1030 >60 >60 0.2 3.0 14.9 5.69/18/2013 1240 >60 >60 0.0 0.0 13.0 6.612/17/2013 1445 >60 >60 0.0 0.0 15.0 6.23/11/2014 1155 >60 >60 0.0 0.0 14.4 5.46/3/2014 1545 >60 >60 0.0 0.0 13.3 5.29/17/2014 1150 >60 >60 0.0 0.0 12.0 6.912/15/2014 1335 >60 >60 0.0 0.0 12.9 7.23/31/2015 1215 >60 >60 0.0 0.0 12.1 6.26/23/2015 1130 >60 >60 0.0 0.0 11.7 6.29/16/2015 1130 >60 >60 0.0 0.0 12.1 8.012/14/2015 1410 >60 >60 0.0 0.0 12.3 7.8
10/16/2012 1155 >120 >120 0.0 0.0 18.8 2.611/19/2012 1145 >60 >60 0.0 0.0 18.0 4.512/7/2012 925 >60 >60 0.0 0.0 15.3 6.81/22/2013 1115 >60 >60 0.0 0.0 14.6 6.92/15/2013 1025 >60 >60 0.0 0.0 14.3 6.83/15/2012 1032 >60 >60 0.0 0.0 20.2 0.64/17/2013 1007 >60 >60 0.0 0.0 14.0 6.46/27/2013 1050 >60 >60 0.2 3.0 12.0 7.59/18/2013 1250 >60 >60 0.0 0.0 19.0 1.112/17/2013 1435 >60 >60 0.0 0.0 11.4 9.03/11/2014 1145 >60 >60 0.0 0.0 11.3 7.46/3/2014 1610 >60 >60 0.0 0.0 9.8 7.69/17/2014 1200 >60 >60 0.0 0.0 9.5 9.312/15/2014 1350 >60 >60 0.0 0.0 10.1 9.73/31/2015 1145 >60 >60 0.0 0.0 10.4 8.06/23/2015 1140 >60 >60 0.0 0.0 9.2 8.39/16/2015 1150 >60 >60 0.0 0.0 10.2 9.812/14/2015 1423 >60 >60 0.0 0.0 9.5 9.8
10/16/2012 1210 >120 >120 0.0 0.0 17.2 3.211/19/2012 1130 >60 >60 0.0 0.3 21.6 0.012/7/2012 1000 >60 >60 0.0 0.0 21.4 0.21/22/2013 1110 >60 >60 0.0 0.0 21.1 0.22/15/2013 1050 >60 >60 0.0 0.0 21.5 0.33/15/2013 1012 >60 >60 0.0 0.0 20.7 0.34/17/2013 1013 >60 >60 0.0 0.0 17.7 2.46/27/2013 1110 >60 >60 0.1 0.2 12.1 6.69/18/2013 1300 >60 >60 0.0 0.0 16.4 2.812/17/2013 1420 >60 >60 0.0 0.0 20.2 0.83/11/2014 1140 >60 >60 0.0 0.0 20.2 0.26/3/2014 1620 >60 >60 0.0 0.0 9.5 5.79/17/2014 1205 >60 >60 0.0 0.0 9.0 7.312/15/2014 1400 >60 >60 0.0 0.0 8.2 7.93/31/2015 1130 >60 >60 0.0 0.0 12.5 4.76/23/2015 1155 >60 >60 0.0 0.0 8.0 7.09/16/2015 1200 >60 >60 0.0 0.0 13.4 4.512/14/2015 1430 >60 >60 0.0 0.0 9.9 7.3
CH4 = Methane; O2 = Oxygen; CO2 = Carbon Dioxide; LEL = Lower Explosive Limit5% CH4 = 100% LELLandfill gas data were collected using a calibrated Landtec GEM 2000, or GEM 2000 Plus.
Shaded/bolded values indicated greater than 100% LEL (greater than 5% methane).
LG-11
LG-8
LG-8R
LG-9
LG-10
Table 5
Groundwater Velocity Data
MW-4D 5.15E-03 0.28 NA NA NA
0.020 1.14E-05 0.0160.083 4.75E-05 0.068
Notes:
NA = Not available. MW-4D is the only deep well on site.
Velocity calculated from: V=KI/n.
Hydraulic conductivity results from slug testing.
Effective porosity estimated from McWorter & Sunada (1977).
Hydraulic gradient from Figure 1.
MW-5 1.43E-04 0.25
Shotwell Constructon & Demolition Debris Landfill
Well ID
Hydraulic
Conductivity (K)
(ft/min)
Effective
Porosity (n)
(%)
Velocity (V)
(ft/day)
Hydraulic
Gradient (I)
(ft/ft)
Velocity (V)
(ft/min)
Wendell, North Carolina
APPENDICES
APPENDIX A
FIELD SAMPLE COLLECTION RECORDS
APPENDIX B
LABORATORY ANALYTICAL REPORT
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APPENDIX C
LANDFILL GAS MONITORING DATA FORMS