9226_ShotwellCDLF_GWMR_DIN28115_20161221

Groundwater Monitoring Report
December 2016 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
February 2017
2
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 20, 2016 2 Stabilized Groundwater Field Parameter Measurements – December 21 and 22, 2016
3 Summary of Analytical Results – December 21 and 22, 2016 4 Historical Landfill Gas Monitoring Data 5 Groundwater Velocity Data
Figures 1 Water Table Contour Map – December 20, 2016 Appendices A Groundwater Monitoring Well Inspection Checklists B Field Sample Collection Records C Landfill Gas Monitoring Data Forms (September and December 2016) D Laboratory Analytical Report

3
1.0 Introduction From December 20 to 22, 2016, 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 2016 to satisfy requirements in the facility’s Solid Waste Permit. 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); however, the SW-1 sample location was altered due to recent clearing activities for landfill expansion. The sample was collected
from the approximate original location. 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. The Groundwater Monitoring Well Inspection Checklists are included in Appendix A. Low-flow (micro-purge) sampling procedures were used for well purging and groundwater sampling during the December 2016 sampling event, except for well MW-1A as discussed below. Sample collection procedures were 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 before sample collection the following day.
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-52 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 just prior to sampling.
4
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 B.
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 15, 2016, and December 20, 2016, 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. Landfill Gas Monitoring Data Forms for the reporting period are provided in Appendix C.
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 no VOCs were detected above their respective
15A NCAC 2L Standard (North Carolina Groundwater Quality Standard, or Interim Maximum Allowable Concentration, hereinafter referred to as the 2L Standards).
Metals were detected above their respective 2L Standard as follows:
Cobalt: MW-6 and MW-7. The concentration detected in the sample collected from MW-7 was estimated (i.e., “J” flagged) indicating the reported concentration was between the method detection limit (MDL) and the method reporting limit (MRL).
Iron: MW-4S, MW-4D, MW-6, and MW-8. Manganese: MW-4D, MW-5, MW-6, and MW-8.
5
Mercury: MW-6. This is the first time this compound has been detected above the 2L Standard at the site.
Vanadium: MW-8. The concentration was estimated (“J” flagged). No additional inorganic target compounds were detected in the groundwater samples that
exceeded their respective 2L Standard. Groundwater analytical results are summarized in Table 3 and the laboratory analytical report is provided in Appendix D.
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 other than the detection of copper in the duplicate sample. 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, or National Criteria per EPA (hereinafter referred to as the 2B Standards).
Regarding metals, cobalt and copper were detected above their respective 2B Standards in the sample collected at SW-1. The cobalt concentration was estimated (“J” flagged). Surface water analytical results are summarized in Table 3 and the laboratory analytical report is provided in Appendix D. 3.3 Landfill Gas Results
As noted above, quarterly landfill gas monitoring events were conducted on September 15, 2016, and December 20, 2016, at 11 landfill gas monitoring wells and the scale house during the reporting period. As historically observed, wells LG-3 and LG-4 exhibited greater than 100% of the lower explosive limit (LEL) during the reporting period (i.e., 482% and 142% LEL at LG-3 in September and December, respectively; and 224% LEL at LG-4 in September). The % LEL at LG-4 in December decreased significantly to 9%. 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 23% and 2% LEL, respectively, during the reporting period. 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 20, 2016, 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.
The horizontal groundwater velocity was estimated from a previously calculated hydraulic conductivity value at well MW-5 using the equation V = KI/n where:
6
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 as calculated in Table 5. 5.0 Summary and Conclusions No VOCs were detected in groundwater or surface water above the laboratory method detection limit. Five (5) inorganic analytes (cobalt, iron, manganese, mercury, and vanadium) were detected at concentrations at or above their respective 2L Standard in groundwater at the site as follows:
• Cobalt – MW-6 and MW-7 (MW-7 at an estimated value);
• Iron – MW-4S, MW-4D, MW-6, and MW-8;
• Manganese – MW-4D, MW-5, MW-6, and MW-8;
• Mercury – MW-6 (first time detected above the 2L Standard at the site); and
• Vanadium – MW-8 (estimated value).
Detections of these inorganic analytes are consistent with historical site data and believed to be originating from natural geologic conditions as discussed in prior reports.
Cobalt has been detected above the 2B Standard in the past at SW-1, but copper has not. The addition of copper could be related to recent land disturbance activities in the area for landfill
expansion. Vanadium was again detected at SW-1 and SW-3 at estimated concentrations. A 2B Standard has not been established for vanadium. Vanadium has historically been detected at these two (2) surface water locations at estimated values. Elevated % LEL readings continue to be observed at wells LG-3 and LG-4; however, the % LEL at LG-4 in December decreased significantly. The % LEL at LG-3 increased to above 100% in June 2015 and has remained above 100% since that time after being at or below 54% from January 2013 to September 2014. The % LEL at LG-4 increased to above 100% in June 2012 and has remained above 100% until the most recent measurement in December 2016, where it decreased significantly to 9%. The downgradient sentinel landfill gas wells for LG-3 and LG-4 (i.e., LG-9, LG-10, and LG-11) 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 were 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 2017. Semi-annual groundwater monitoring will continue at the site with the next event scheduled for June 2017.

TABLES

MW‐1A 09/27/06 28 ‐ 38 2" PVC 268.58 41.2 36.45 232.13
MW‐3A 02/21/07 10 ‐ 20 2" PVC 224.41 33.0 16.66 207.75
MW‐4S 03/08/01 10 ‐ 25 2" PVC 220.87 32.0 24.62 196.25
MW‐4D 03/07/01 39 ‐ 49 2" PVC 220.87 52.4 24.60 196.27
MW‐5 03/06/01 4 ‐ 19 2" PVC 216.66 22.3 8.61 208.05
MW‐6 02/21/07 15 ‐ 25 2" PVC 239.45 33.2 23.50 215.95
MW‐7 03/01/11 16 ‐ 26 2" PVC 248.73 28.6 14.74 233.99
MW‐811/06/13 16 ‐ 26 2" PVC 264.20 29.0 19.43 244.77
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 20, 2016
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* 4.0 14.7 5.50 0.100 11.0 6.81 131
MW‐3A 1.25 15.6 4.99 0.107 0.4 1.18 245
MW‐4S 1.0 15.3 5.39 0.234 1.3 0.77 197
MW‐4D 1.25 14.5 5.59 0.548 0.6 0.66 170
MW‐5 1.25 16.8 5.13 0.114 0.4 0.46 298
MW‐6 1.0 16.4 4.95 0.094 1.1 0.52 235
MW‐7 1.25 16.2 4.77 0.068 8.7 0.36 424
MW‐8 1.75 14.8 5.85 0.230 4.4 1.39 245
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 20, 2016
Sample ID Temperature 
(degrees C)pH (STU)
Oxidation 
Reduction 
Potential (mV)
Specific 
Conductivity 
(mS/cm)
Wendell, North Carolina
Turbidity (NTU)
Dissolved 
Oxygen   
(mg/L)
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(Gallons)
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Table 4
Historical Landfill Gas Monitoring Data
Shotwell Construction Demolition Landfill Wendell, North Carolina
Sample Sample Sample Sample Tube Time % CH4
Location Date Time Purge (sec.)Pumped (sec.)By Volume
7/14/2011 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 0.1
12/7/2012 1000 >60 >60 0.0 0.0 21.4 0.2
9/18/2013 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 0.1
12/15/2014 1225 >60 >60 0.0 0.0 21.0 0.1
3/31/2015 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 0.23/15/2016 1145 >60 >60 0.0 0.0 20.6 0.1
6/8/2016 1540 >60 >60 0.0 0.0 20.9 0.0
9/15/2016 1120 >60 >60 0.0 0.0 20.5 0.212/20/2016 1100 >60 >60 0.0 0.0 21.0 0.1
6/20/2011 1150 >60 >120 0.1 2.0 14.9 7.4
10/11/2011 1105 >60 >120 0.0 0.0 14.3 8.2
12/8/2012 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 13.7
6/18/2012 1030 >60 >60 0.0 0.0 14.1 8.9
11/19/2012 1130 >60 >60 0.0 0.0 21.6 0.0
12/7/2012 850 >60 >60 0.0 0.0 13.6 9.1
6/27/2013 1045 >60 >60 0.2 3.0 12.8 9.1
9/18/2013 1155 >60 >60 0.0 0.0 12.6 9.3
12/17/2013 1515 >60 >60 0.1 2.0 14.4 8.5
3/11/2014 1210 >60 >60 0.0 0.0 14.0 7.4
6/3/2014 1510 >60 >60 0.0 0.0 13.0 7.1
9/17/2014 1130 >60 >60 0.0 0.0 11.6 9.6
12/15/2014 1310 >60 >60 0.0 0.0 11.7 10.3
3/31/2015 1245 >60 >60 0.0 0.0 12.2 8.8
6/23/2015 1050 >60 >60 0.0 0.0 11.2 10.6
9/16/2015 1220 >60 >60 0.0 0.0 10.4 11.9
12/14/2015 1340 >60 >60 0.0 1.0 7.4 14.1
3/15/2016 1240 >60 >60 0.0 0.0 8.6 12.2
6/8/2016 1405 >60 >60 0.0 0.0 7.5 13.9
9/15/2016 1225 >60 >60 0.0 0.0 11.2 12.8
12/20/2016 1445 >60 >60 0.0 0.0 14.3 8.2
6/20/2011 1210 >60 >120 0.3 6.0 8.0 11.0
10/11/2011 1122 >60 >120 0.4 8.0 3.8 17.7
12/8/2011 1500 >60 >120 0.0 0.0 5.2 17.0
3/8/2012 1210 >60 >120 0.2 4.0 6.8 15.2
6/12/2012 1200 >60 >60 0.0 0.0 4.0 17.6
6/18/2012 1020 >60 >60 0.0 0.0 3.6 18.8
11/19/2012 1140 >60 >60 0.0 0.0 7.4 14.5
12/7/2012 900 >60 >60 0.0 0.0 4.5 17.3
6/27/2013 1035 >60 >60 0.1 2.0 4.0 16.5
9/18/2013 1210 >60 >60 0.0 0.0 16.7 3.3
12/17/2013 1500 >60 >60 0.0 0.0 5.3 16.6
3/11/2014 1205 >60 >60 0.0 0.0 7.1 13.3
6/3/2014 1520 >60 >60 0.0 0.0 3.6 14.6
9/17/2014 1135 >60 >60 0.0 0.0 2.7 18.7
12/15/2014 1320 >60 >60 0.0 0.0 2.9 18.4
3/31/2015 1230 >60 >60 0.0 0.0 5.2 14.5
6/23/2015 1100 >60 >60 0.0 0.0 3.7 17.0
9/16/2015 1125 >60 >60 0.0 0.0 4.5 18.4
12/14/2015 1348 >60 >60 0.0 0.0 3.1 18.3
3/15/2016 1250 >60 >60 0.0 0.0 4.0 15.5
6/8/2016 1420 >60 >60 0.0 0.0 1.5 17.7
9/15/2016 1230 >60 >60 0.0 0.0 4.6 17.8
12/20/2016 1425 >60 >60 0.0 0.0 8.6 12.8
6/20/2011 1223 >60 >120 0.5 9.0 12.1 3.1
10/11/2011 1138 >60 >120 2.0 40.0 3.3 10.1
12/8/2011 1515 >60 >120 0.0 1.0 21.0 0.4
3/8/2012 1230 >60 >120 2.1 42.0 6.1 9.3
6/12/2012 1100 >60 >60 5.5 110 0.7 12.0
6/18/2012 1010 >60 >60 5.8 116 0.7 13.2
6/21/2012 915 >60 >60 5.6 112 0.6 12.5
6/22/2012 925 >60 >60 5.9 118 0.7 12.7
8/23/2012 1555 >120 >120 2.4 48.0 9.8 8.1
10/16/2012 1125 >120 >120 3.8 76.0 10.1 8.2
11/19/2012 1111 >60 >60 3.8 76.0 6.7 11.7
12/7/2012 905 >60 >60 6.9 138 0.5 15.7
1/22/2013 1130 >60 >60 2.7 54.0 0.9 14.9
2/15/2013 1135 >60 >60 2.4 49.0 2.3 14.3
3/15/2013 1020 >60 >60 0.0 0.0 20.6 0.6
4/17/2013 1000 >60 >60 0.0 0.0 20.6 0.0
6/27/2013 1020 >60 >60 0.9 19.0 1.5 16.4
9/18/2013 1220 >60 >60 0.6 13.0 17.2 2.6
12/17/2013 1450 >60 >60 1.1 22.0 15.4 5.3
3/11/2014 1225 >60 >60 0.0 1.0 16.4 3.3
6/3/2014 1555 >60 >60 0.7 14.0 13.7 4.9
9/17/2014 1145 >60 >60 1.3 27.0 15.0 5.1
12/15/2014 1340 >60 >60 6.0 120 0.0 20.4
3/31/2015 1200 >60 >60 0.0 0.0 6.0 13.7
6/23/2015 1120 >60 >60 12.6 252 0.0 19.8
9/16/2015 1140 >60 >60 16.5 330 0.0 24.0
12/14/2015 1415 >60 >60 12.6 252 0.0 24.0
3/15/2016 1345 >60 >60 6.3 126 0.0 21.1
6/8/2016 1445 >60 >60 24.7 494 0.1 25.2
9/15/2016 1250 >60 >60 24.1 482 0.4 31.7
12/20/2016 1415 >60 >60 7.1 142 5.3 19.3
LG‐2
LG‐3
% LEL % O2 % CO2
Scale House
LG‐1
Page 1 of 3
Table 4
Historical Landfill Gas Monitoring Data
Shotwell Construction Demolition Landfill Wendell, North Carolina
Sample Sample Sample Sample Tube Time % CH4
Location Date Time Purge (sec.)Pumped (sec.)By Volume % LEL % O2 % CO2
6/20/2011 1234 >60 >120 0.2 4.0 18.7 1.1
10/11/2011 1153 >60 >120 0.0 0.0 18.7 2.9
12/8/2011 1530 >60 >120 0.2 4.0 16.0 5.6
3/8/2012 1250 >60 >120 1.2 24.0 2.7 11.6
6/12/2012 1030 >60 >60 12.6 252 0.1 13.2
6/18/2012 1000 >60 >60 12.9 258 0.4 14.1
6/21/2012 930 >60 >60 11.5 230 1.8 12.2
6/22/2012 940 >60 >60 8.5 170 7.6 8.1
8/23/2012 1535 >120 >120 20.9 418 0.0 16.3
10/16/2012 1255 >120 >120 7.2 144 15.7 4.4
11/19/2012 1200 >60 >60 27.4 548 21.3 15.3
12/7/2012 940 >60 >60 39.5 790 0.5 15.0
1/22/2013 1140 >60 >60 29.4 588 0.4 14.1
2/15/2013 1055 >60 >60 29.6 594 0.2 14.2
3/15/2013 1010 >60 >60 31.7 634 0.0 14.5
4/17/2013 1020 >60 >60 23.4 468 4.7 10.8
6/27/2013 1100 >60 >60 34.0 680 0.1 18.0
9/18/2013 1310 >60 >60 38.3 766 0.0 21.6
12/17/2013 1430 >60 >60 40.3 806 0.0 19.9
3/11/2014 1235 >60 >60 30.1 602 1.4 16.1
6/3/2014 1625 >60 >60 29.4 588 0.0 20.2
9/17/2014 1210 >60 >60 37.5 750 0.0 26.4
12/15/2014 1405 >60 >60 37.0 740 0.0 23.9
3/31/2015 1115 >60 >60 27.8 556 0.6 20.7
6/23/2015 1150 >60 >60 32.8 656 0.1 25.4
9/16/2015 1210 >60 >60 23.6 472 0.0 29.0
12/14/2015 1435 >60 >60 27.9 558 0.0 27.9
3/15/2016 1415 >60 >60 25.8 516 0.0 23.4
6/8/2016 1555 >60 >60 21.1 422 0.8 26.6
9/15/2016 1310 >60 >60 11.2 224 0.1 28.1
12/20/2016 1350 >60 >60 0.4 9 5.1 18.0
6/20/2011 1410 >60 >120 0.0 0.0 16.7 4.4
10/11/2011 1212 >60 >120 0.3 5.0 16.0 5.4
12/8/2011 1545 >60 >120 0.0 0.0 16.9 5.4
3/8/2012 1310 >60 >120 0.0 0.0 16.6 5.0
6/12/2012 900 >60 >60 0.0 0.0 16.0 5.3
6/18/2012 1100 >60 >60 0.0 0.0 16.5 5.5
11/19/2012 1055 >60 >60 0.0 0.0 20.5 2.2
12/7/2012 950 >60 >60 0.0 0.0 16.9 5.2
6/27/2013 955 >60 >60 0.2 3.0 16.1 5.2
9/18/2013 1320 >60 >60 0.0 0.0 15.2 5.8
12/17/2013 1355 >60 >60 0.0 1.0 15.8 9.0
3/11/2014 1130 >60 >60 0.0 0.0 15.5 5.3
6/3/2014 1655 >60 >60 0.0 0.0 14.7 5.2
9/17/2014 1220 >60 >60 0.0 0.0 14.2 6.3
12/15/2014 1425 >60 >60 0.0 0.0 14.6 6.9
3/31/2015 1100 >60 >60 0.0 0.0 13.9 6.8
6/23/2015 1155 >60 >60 0.0 0.0 13.8 6.1
9/16/2015 1230 >60 >60 0.0 0.0 14.7 6.6
12/14/2015 1253 >60 >60 0.0 0.0 13.7 7.1
3/15/2016 1225 >60 >60 0.0 0.0 14.2 6.1
6/8/2016 1610 >60 >60 0.0 0.0 13.8 6.5
9/15/2016 1330 >60 >60 0.0 0.0 16.0 6.2
12/20/2016 1330 >60 >60 0.0 0.0 17.7 4.2
6/20/2011 1423 >60 >120 0.0 0.0 15.9 3.5
10/11/2011 1230 >60 >120 0.0 0.0 13.8 7.3
12/8/2011 1655 >60 >120 0.0 0.0 15.0 7.3
3/8/2012 1325 >60 >120 0.0 0.0 15.6 5.9
6/12/2012 1400 >60 >60 0.0 0.0 14.9 6.3
6/18/2012 1115 >60 >60 0.0 0.0 15.6 6.8
11/19/2012 950 >60 >60 0.0 0.0 21.4 6.3
12/7/2012 1005 >60 >60 0.0 0.0 18.0 4.2
6/27/2013 1035 >60 >60 0.2 3.0 14.9 6.4
9/18/2013 1335 >60 >60 0.0 0.0 16.6 4.8
12/17/2013 1230 >60 >60 0.0 0.0 15.6 5.8
3/11/2014 1045 >60 >60 0.0 0.0 15.2 5.9
6/3/2014 1250 >60 >60 0.0 0.0 13.4 6.9
9/17/2014 1225 >60 >60 0.0 0.0 11.5 9.1
12/15/2014 1235 >60 >60 0.0 0.0 14.6 6.9
3/31/2015 1330 >60 >60 0.0 0.0 13.2 17.5
6/23/2015 1400 >60 >60 0.0 0.0 12.3 8.2
9/16/2015 1300 >60 >60 0.0 0.0 11.9 8.9
12/14/2015 1132 >60 >60 0.0 0.0 11.9 9.0
3/15/2016 1155 >60 >60 0.0 0.0 12.6 7.7
6/8/2016 1620 >60 >60 0.0 0.0 12.4 8.1
9/15/2016 1340 >60 >60 0.0 0.0 14.0 8.2
12/20/2016 1115 >60 >60 0.0 0.0 17.3 5.1
6/20/2011 1437 >60 >120 0.0 0.0 13.0 3.1
10/11/2011 1355 >60 >120 0.8 17.0 10.0 6.9
12/8/2011 1635 >60 >120 0.0 0.0 10.9 6.6
3/8/2012 1335 >60 >120 0.0 0.0 9.0 6.7
6/12/2012 1500 >60 >60 0.0 0.0 7.0 8.8
6/18/2012 1130 >60 >60 0.0 0.0 7.6 9.1
11/19/2012 1010 >60 >60 0.0 0.0 18.0 2.412/7/2012 1035 >60 >60 0.0 0.0 11.7 6.2
6/27/2013 830 >60 >60 0.2 3.0 3.2 12.6
9/18/2013 1350 >60 >60 0.0 0.0 3.3 12.9
12/17/2013 1245 >60 >60 0.1 1.0 6.7 10.0
3/11/2014 1100 >60 >60 0.7 14.0 1.2 13.8
6/3/2014 1310 >60 >60 0.3 7.0 0.0 14.89/17/2014 1235 >60 >60 0.7 15.0 0.2 16.2
12/15/2014 1435 >60 >60 0.7 15.0 0.0 17.3
3/31/2015 1315 >60 >60 1.3 27.0 0.5 15.1
6/23/2015 1345 >60 >60 1.5 29.0 0.1 16.2
9/16/2015 1250 >60 >60 1.0 20.0 0.0 18.4
12/14/2015 1141 >60 >60 1.7 35.0 0.0 18.73/15/2016 1205 >60 >60 1.5 29.0 0.0 16.2
6/8/2016 1625 >60 >60 1.4 28.0 0.1 17.1
9/15/2016 1130 >60 >60 0.3 5.0 0.7 19.1
12/20/2016 1130 >60 >60 0.0 0.0 5.9 13.6
6/20/2011 1500 >60 >120 0.0 1.0 15.1 3.5
LG‐7
LG‐4
LG‐5
LG‐6
Page 2 of 3
Table 4
Historical Landfill Gas Monitoring Data
Shotwell Construction Demolition Landfill Wendell, North Carolina
Sample Sample Sample Sample Tube Time % CH4
Location Date Time Purge (sec.)Pumped (sec.)By Volume % LEL % O2 % CO2
10/11/2011 1420 >60 >120 1.3 27.0 11.9 8.5
12/8/2011 1615 >60 >120 0.1 3.0 13.6 8.7
3/8/2012 1350 >60 >120 0.4 9.0 11.1 8.4
6/12/2012 1530 >60 >60 0.3 6.0 9.8 10.7
6/18/2012 1145 >60 >60 0.3 6.0 9.8 10.7
11/19/2012 1045 >60 >60 0.3 6.0 12.8 8.9
12/7/2012 1020 >60 >60 0.4 8.0 11.3 9.4
6/27/2013 930 >60 >60 0.4 8.0 7.5 11.1
9/18/2013 1440 >60 >60 0.2 4.0 7.5 10.6
12/17/2013 1300 >60 >60 0.1 2.0 8.5 10.0
3/11/2014 1110 >60 >60 0.0 1.0 7.0 11.1
6/3/2014 1330 >60 >60 0.0 0.0 5.7 11.5
9/17/2014 1305 >60 >60 0.0 0.0 17.0 1.0
12/15/2014 1450 >60 >60 0.0 0.0 6.1 7.6
3/31/2015 1300 >60 >60 0.0 0.0 6.4 7.3
6/23/2015 1335 >60 >60 0.8 15.0 0.3 10.5
9/16/2015 1240 >60 >60 1.7 35.0 0.4 12.0
12/14/2015 1210 >60 >60 1.3 27.0 1.1 13.2
3/15/2016 1215 >60 >60 0.8 14.0 0.7 12.8
6/8/2016 1640 >60 >60 1.1 23.0 0.0 13.9
9/15/2016 1140 >60 >60 1.1 23.0 0.5 15.6
12/20/2016 1140 >60 >60 0.1 2.0 5.4 12.5
10/16/2012 1135 >120 >120 0.0 0.0 17.5 3.7
11/19/2012 1130 >60 >60 0.0 0.0 20.6 1.6
12/7/2012 915 >60 >60 0.0 0.0 17.3 4.6
1/22/2013 1125 >60 >60 0.0 0.0 17.4 4.3
2/15/2013 1040 >60 >60 0.0 0.0 16.6 4.7
3/15/2013 1025 >60 >60 0.0 0.0 16.7 4.6
4/17/2013 950 >60 >60 0.0 0.0 15.6 4.7
6/27/2013 1030 >60 >60 0.2 3.0 14.9 5.6
9/18/2013 1240 >60 >60 0.0 0.0 13.0 6.6
12/17/2013 1445 >60 >60 0.0 0.0 15.0 6.2
3/11/2014 1155 >60 >60 0.0 0.0 14.4 5.4
6/3/2014 1545 >60 >60 0.0 0.0 13.3 5.2
9/17/2014 1150 >60 >60 0.0 0.0 12.0 6.9
12/15/2014 1335 >60 >60 0.0 0.0 12.9 7.2
3/31/2015 1215 >60 >60 0.0 0.0 12.1 6.2
6/23/2015 1130 >60 >60 0.0 0.0 11.7 6.2
9/16/2015 1130 >60 >60 0.0 0.0 12.1 8.0
12/14/2015 1410 >60 >60 0.0 0.0 12.3 7.8
3/15/2016 1340 >60 >60 0.0 0.0 12.2 6.4
6/8/2016 1440 >60 >60 0.0 0.0 11.7 6.7
9/15/2016 1245 >60 >60 0.0 0.0 13.4 7.6
12/20/2016 1410 >60 >60 0.0 0.0 16.0 5.2
10/16/2012 1155 >120 >120 0.0 0.0 18.8 2.6
11/19/2012 1145 >60 >60 0.0 0.0 18.0 4.5
12/7/2012 925 >60 >60 0.0 0.0 15.3 6.8
1/22/2013 1115 >60 >60 0.0 0.0 14.6 6.9
2/15/2013 1025 >60 >60 0.0 0.0 14.3 6.8
3/15/2012 1032 >60 >60 0.0 0.0 20.2 0.6
4/17/2013 1007 >60 >60 0.0 0.0 14.0 6.4
6/27/2013 1050 >60 >60 0.2 3.0 12.0 7.5
9/18/2013 1250 >60 >60 0.0 0.0 19.0 1.1
12/17/2013 1435 >60 >60 0.0 0.0 11.4 9.0
3/11/2014 1145 >60 >60 0.0 0.0 11.3 7.4
6/3/2014 1610 >60 >60 0.0 0.0 9.8 7.6
9/17/2014 1200 >60 >60 0.0 0.0 9.5 9.3
12/15/2014 1350 >60 >60 0.0 0.0 10.1 9.7
3/31/2015 1145 >60 >60 0.0 0.0 10.4 8.0
6/23/2015 1140 >60 >60 0.0 0.0 9.2 8.3
9/16/2015 1150 >60 >60 0.0 0.0 10.2 9.8
12/14/2015 1423 >60 >60 0.0 0.0 9.5 9.8
3/15/2016 1355 >60 >60 0.0 0.0 8.7 7.9
6/8/2016 1455 >60 >60 0.2 4.0 7.9 8.7
9/15/2016 1300 >60 >60 0.0 0.0 10.1 10.1
12/20/2016 1400 >60 >60 0.0 0.0 14.1 6.7
10/16/2012 1210 >120 >120 0.0 0.0 17.2 3.2
11/19/2012 1130 >60 >60 0.0 0.3 21.6 0.0
12/7/2012 1000 >60 >60 0.0 0.0 21.4 0.2
1/22/2013 1110 >60 >60 0.0 0.0 21.1 0.2
2/15/2013 1050 >60 >60 0.0 0.0 21.5 0.3
3/15/2013 1012 >60 >60 0.0 0.0 20.7 0.3
4/17/2013 1013 >60 >60 0.0 0.0 17.7 2.4
6/27/2013 1110 >60 >60 0.1 0.2 12.1 6.6
9/18/2013 1300 >60 >60 0.0 0.0 16.4 2.8
12/17/2013 1420 >60 >60 0.0 0.0 20.2 0.8
3/11/2014 1140 >60 >60 0.0 0.0 20.2 0.2
6/3/2014 1620 >60 >60 0.0 0.0 9.5 5.7
9/17/2014 1205 >60 >60 0.0 0.0 9.0 7.3
12/15/2014 1400 >60 >60 0.0 0.0 8.2 7.9
3/31/2015 1130 >60 >60 0.0 0.0 12.5 4.7
6/23/2015 1155 >60 >60 0.0 0.0 8.0 7.0
9/16/2015 1200 >60 >60 0.0 0.0 13.4 4.512/14/2015 1430 >60 >60 0.0 0.0 9.9 7.3
3/15/2016 1405 >60 >60 0.0 0.0 12.4 4.6
6/8/2016 1550 >60 >60 0.0 0.0 10.4 5.3
9/15/2016 1305 >60 >60 0.0 0.0 13.0 5.2
12/20/2016 1345 >60 >60 0.0 0.0 19.5 1.2
CH4 = Methane; O2 = Oxygen; CO2 = Carbon Dioxide; LEL = Lower Explosive Limit
5% CH4 = 100% LEL
Landfill 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
Page 3 of 3
Table 5
Groundwater Velocity Data
MW‐4D 5.15E‐03 0.28 NA NA NA
0.020 1.14E‐05 0.016
0.083 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

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WATER TABLE CONTOUR MAP - DECEMBER 20, 2016
WENDELL - WAKE COUNTY
SHOTWELL C&D LANDFILL
PLAN REVISIONS
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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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APPENDICES

APPENDIX A
GROUNDWATER MONITORING WELL INSPECTION
CHECKLISTS

APPENDIX B
FIELD SAMPLE COLLECTION RECORDS

APPENDIX C
LANDFILL GAS MONITORING DATA FORMS

APPENDIX D
LABORATORY ANALYTICAL REPORT
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