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HomeMy WebLinkAbout1102_BASFIndustrial_GWMR_DIN28338_20170426 ELM Site Solutions, Inc. P. O. Box 97607 Raleigh, North Carolina 27624 (919) 792-3733 1 June 30, 2017 Submitted via Electronic Mail Ms. Jaclynne Drummond Compliance Hydrogeologist North Carolina Department of Environmental Quality Division of Waste Management - Solid Waste Section 2090 US Highway 70 Swannanoa, North Carolina 28778 Subject: Semi-Annual Monitoring Report BASF Former Industrial Landfill Facility Permit # 11-02 Enka, North Carolina Dear Ms. Drummond: ELM Site Solutions, Inc., on behalf of BASF Corporation, herein submits an electronic copy of the semi-annual sampling report for the above-referenced site. This letter report presents results of the semi-annual sampling activities conducted on April 26 and 27, 2017, which constitutes the first semi-annual sampling event for 2017. The approved groundwater monitoring network consists of MW-3, MW-4R, MW-5 and background well MW-6. The monitoring network also includes surface water sample locations SW-1 and DW-2 from Hominy Creek. In a letter dated November 4, 2010, the North Carolina Department of Environmental Quality (NCDEQ) – Solid Waste Section requested the collection of an additional surface water sample from a seep area in conjunction with the semi-annual groundwater sampling events for a minimum of five (5) years. Sampling results for the monitoring wells, surface water samples and surface seep (Seep-1) are discussed below. In addition to the groundwater samples outlined above, 10 landfill gas monitoring wells (LG-1 through LG-10) were installed at the site in May 2010. Landfill gas quarterly monitoring events were conducted on March 24, 2017 and June 9, 2017 during this reporting period. Gas monitoring results are also discussed below. A completed Environmental Monitoring Report Form follows this letter report. FIELD ACTIVITIES Field Investigation methods for this groundwater monitoring event were conducted in compliance with industry standards and the U.S. Environmental Protection Agency (EPA) Region IV Field Ms. Jaclynne Drummond June 30, 2017 2 Branch’s Quality System and Technical Procedures. Groundwater samples from the site were collected using low-flow techniques with a peristaltic pump. Water levels were measured at each well prior to sampling using a Testwell water level meter (Table 1). ELMSS field personnel observed two (2) of the groundwater monitoring wells had been altered since the last sampling event in October 2016. Specifically, the total depth for MW-3 was originally 30.16 feet below top of casing (btoc); the total depth for MW-3 is now 41.10 feet btoc, as measured on April 26, 2017. Additionally, the total depth for MW-6 was originally 41.18 feet btoc; the total depth for MW-6 is now 22.20 feet btoc, as measured on April 26, 2017. The alterations to these wells were presumably conducted during the on-going grading operations at the Site. Neither BASF nor ELMSS were contacted regarding any modifications to these wells. Top of casing elevations are currently unknown for groundwater monitoring wells MW-3 and MW-6 due to the alterations made to these wells. Therefore, no potentiometric contour map was created for the April 2017 groundwater monitoring event. Relative groundwater elevations for MW-4R and MW-5 as measured on April 26, 2017 are shown on Figure 1. Purging was accomplished by using a variable speed peristaltic pump with the pumping rate adjustable to equal the approximate recharge rate of the well. Indicator parameters of pH, temperature, specific conductance and turbidity were measured regularly during purging with Horiba U-52 water quality meter until the measured values stabilized. This method targets the collection of groundwater samples that have the least total suspended solid count obtainable without filtering in the field, thus giving a more accurate indication of dissolved constituents present in the aquifer. Groundwater sample collection record sheets are provided in Appendix A. Surface water samples were collected directly from Hominy Creek by filling pre-preserved laboratory sample containers. The seep sample (Seep-1) was collected from a 4-inch pipe located at the base of the seep area. Sample locations are shown on Figure 2. Water quality parameters for the monitoring wells, surface water locations and seep at the time of sampling are presented in Table 2. As noted above, 10 landfill gas monitoring wells were sampled on March 24, 2017 and June 9, 2017. Well locations are presented on Figure 3. 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 sample collection record sheets are provided in Appendix B. SAMPLING RESULTS Environmental Conservation Laboratories, Inc. in Cary, North Carolina analyzed the groundwater and surface water samples for Appendix I volatile organic compounds (VOCs) by EPA Method 8260B, Appendix I metals by EPA Methods 6010C/6020A, mercury by EPA Method 7470A, sulfate by EPA Method 300.0 and total dissolved solids by SM 2540C. Due to the aforementioned alterations to groundwater monitoring wells MW-3 and MW-6 discussed above, no samples were collected from these wells. Groundwater samples were only collected from MW-4R and MW-5. The surface seep sample was analyzed for Appendix I VOCs. A copy of the analytical data is presented in Appendix C. Ms. Jaclynne Drummond June 30, 2017 3 For data analysis, groundwater monitoring well results were compared to 15A NCAC 2L Groundwater Standards, the regulatory basis established to determine groundwater quality. Surface water results were compared to 15A NCAC 2B Surface Water Standards. Monitoring wells had one (1) or more analyte concentrations that exceeded their respective groundwater standards. No analyte concentrations detected in the surface water samples exceeded their respective standards. Detections are discussed below. Analytical results are summarized in Table 3. No organic constituents were detected above laboratory method reporting limits in any of the groundwater or surface water samples during the April 2017 monitoring event. For inorganic constituents, barium, cobalt, sulfate and vanadium were detected in groundwater monitoring wells and/or surface water samples above laboratory method reporting limits. All of the barium concentrations were below their respective 15A NCAC 2L Groundwater Standard or 15A NCAC 2B Surface Water Standard. Cobalt was detected in the two (2) monitoring wells (MW-4R and MW-5) sampled at concentrations which exceeded its 15A NCAC 2L Groundwater Standard. Sulfate was detected in one (1) monitoring well (MW-5) at a concentration which exceeded its respective 15A NCAC 2L Groundwater Standard. Vanadium was detected in one (1) groundwater monitoring well (MW-4R) at a concentration which exceeded its 15A NCAC 2L Groundwater Standard. As noted above, quarterly landfill gas monitoring events were conducted on March 24, 2017 and June 9, 2017 for 10 landfill gas wells located near the waste boundary during the reporting period. All gas wells exhibited 0% LEL through the reporting period. Current and historical landfill gas sampling data are summarized in Table 4. The following summarizes results obtained during this reporting period: • Groundwater samples were not collected from MW-3 and MW-6 due to unknown well modifications. • No organic constituents were detected above laboratory method reporting limits in any of the groundwater or surface water samples during the April 2017 monitoring event. • Cobalt was detected in two (2) groundwater monitoring wells (MW-4R and MW-5) at concentrations that exceeded the 15A NCAC 2L Groundwater Standard of 1 ug/L. It should be noted that background soil samples were collected during the initial seep investigation (2010) to assess naturally occurring site conditions. Results from the study included detection of cobalt at a maximum concentration of 9.34 milligrams per kilogram (mg/Kg). The NCDEQ - Inactive Hazardous Sites Branch (IHSB) has established a soil cleanup level protective of groundwater for cobalt at 0.9 mg/Kg. Oxidation Reduction Potential (ORP) measurements in monitoring well MW-5 indicated the presence of a reducing environment potentially mobilizing background metals from soils. Some, if not all, of the cobalt detected during monitoring may be due to mobilization of background metals from soil. • Sulfate was detected in one (1) monitoring well (MW-5) at a concentration that exceeded its 15A NCAC 2L Groundwater Standard of 250 ug/L. The sample result was 260 ug/L and was analyzed at dilution. Ms. Jaclynne Drummond June 30, 2017 4 • No inorganic element concentrations detected in surface water (barium, sulfate or vanadium) exceeded their respective 15A NCAC 2B Standards (where a standard has been established) during this monitoring event. • All gas wells exhibited 0% LEL through the reporting period, which is consistent with historical monitoring. If you have any questions or require any further information, please call Jeremy Odom at (704) 770-1481 or me at (919) 792-3733. Sincerely, ELM Site Solutions, Inc. Rusty Norris, PE, PLS, RSM Senior Engineer c Vernon Burrows TABLES Table 1 Water Level Measurements Semi-Annual Sampling Event April 26-27, 2017 Former BASF Industrial Landfill Enka, North Carolina Facility Permit No.Well Identification Date Total Depth (feet) Screen Interval (feet) Top of Casing (Feet AMSL) Depth to Groundwater (Feet BTOC) Groundwater Elevation (Feet AMSL) 11-02 MW-3 4/26/2017 41.10*Unknown Unknown 18.97 Unknown 11-02 MW-4R 4/26/2017 34.92 23-33 2082.67 26.06 2056.61 11-02 MW-5 4/26/2017 19.35 6-16 2057.62 7.95 2049.67 11-02 MW-6 4/26/2017 22.20**Unknown Unknown 22.18 Unknown NOTES: AMSL - Above Mean Sea Level (Vertical Control NAVD 88) * MW-3 was originally installed to a depth of 30.16 feet below top of casing (btoc). This well's depth had been altered to a total depth of 41.10 feet (btoc) when measured on 04/26/2017. **MW-6 was originally installed to a depth of 41.18 feet below top of casing. This well's depth had been altered to a total depth of 22.20 feet (btoc) when measured on 04/26/2017. Page 1 of 1 Table 1 Table 2 General Groundwater Quality Parameters Semi-Annual Sampling Event April 26-27, 2017 Former BASF Industrial Landfill Enka, North Carolina Facility Permit No.Well Identification Date pH Temp (oC) Conductivity (µs/cm) Turbidity (NTU) Oxidation Reduction Potential (mV) DO (mg/L) TDS (mg/L) 11-02 MW-3 4/26/2017 7.80 19.01 3.380 5.7 -62 1.14 NM 11-02 MW-4R 4/26/2017 6.40 27.09 0.157 9.2 199 2.82 170 11-02 MW-5 4/27/2017 6.74 17.34 1.160 5.6 -62 1.07 770 11-02 MW-6 NM NM NM NM NM NM NM NM 11-02 SW-1 4/26/2017 8.21 18.37 0.065 24.5 171 8.78 84 11-02 DW-2 4/26/2017 8.12 18.59 0.065 22.1 174 8.58 <50 11-02 Seep-1 4/27/2017 6.96 17.97 1.142 4.9 -41 1.06 NM NOTES: DO - Dissolved Oxygen ORP - Oxidation-Reduction Potential TDS - reported in milligrams per liter (mg/L). NM - Not measured BRL - Below reporting limit MW-6 was dry during sampling event Page 1 of 1 Table 2 Barium Cobalt Sulfate Vanadium ug/L ug/L mg/L ug/L 700 1 250 0.3* MW-3 NM NM NM NM NM MW-4R 4/26/2017 90.8 3.04 23 3.56 MW-5 4/27/2017 140 22.3 260 D BRL MW-6 NM NM NM NM NM 1,000 4 250 NS ug/L ug/L mg/L ug/L SW-1 4/26/2017 26.3 BRL 5.9 1.26 DW-2 4/26/2017 28.1 BRL 5.9 1.15 Seep-1 4/27/2017 NM NM NM NM Notes: only COCs detected shown ug/L - micrograms per liter or parts per billion (ppb) mg/L - milligrams per liter or parts per million (ppm) 1.3 * - IMACs (Interim Concentrations) BRL - Below Laboratory Reporting Limit or Practical Quantitation Limit (PQL) NM - Not measured D - analyzed at dilution Non-estimated concentrations that exceed North Carolina 2L Groundwater Standards (April 2013) or NC 2B Surface Water Standards (June 2016) Table 3 Groundwater Analytical Results Semi-Annual Sampling Event April 26-27, 2017 Former BASF Industrial Landfill Enka, North Carolina Monitoring Well and Surface Water I.D.Sample Date Units 15A NCAC 2L Standard 15A NCAC 2B Standard Units Table 4 Landfill Gas Sampling Data Former BASF Industrial Landfill Enka, North Carolina LFG SAMPLE Sample Sample Tube Time % CH4WELL ID DATE Time Purge Pumped By Volume 12/13/2010 1124 >60s >60s 0 0 17.0 4.8LG-1 3/11/2011 1335 >60s >60s 0 0 18.2 3.8 6/3/2011 1100 >60s >60s 0 0 17.0 3.4 10/12/2011 1130 >60s >60s 0 0 16.8 3.8 12/14/2011 1300 >60s >60s 0 0 17.0 3.7 3/8/2012 1200 >60s >60s 0 0 17.3 3.66/14/2012 1115 >60s >60s 0 0 17.0 3.8 9/26/2012 1200 >60s >60s 0 0 17.2 3.612/3/2012 1200 >60s >60s 0 0 18.3 3.9 3/27/2013 1200 >60s >60s 0 0 18.0 3.46/3/2013 1300 >60s >60s 0 0 15.3 3.0 9/17/2013 1130 >60s >60s 0 0 14.5 7.212/11/2013 1200 >60s >60s 0 0 15.3 5.73/13/2014 1200 >60s >60s 0 0 18.2 3.2 6/5/2014 1230 >60s >60s 0 0 15.6 4.29/30/2014 1130 >60s >60s 0 0 14.4 5.5 12/19/2014 1100 >60s >60s 0 0 14.8 5.13/17/2015 1130 >60s >60s 0 0 16.8 4.3 6/19/2015 1215 >60s >60s 0 0 17.1 3.99/14/2015 1400 >60s >60s 0 0 18.2 3.1 12/1/2015 1130 >60s >60s 0 0 15.5 5.53/15/2016 1200 >60s >60s 0 0 15.7 2.66/29/2016 1200 >60s >60s 0 0 16.9 4.2 9/16/2016 1200 >60s >60s 0 0 16.0 4.812/30/2016 1100 >60s >60s 0 0 20.5 3.1 3/24/2017 1030 >60s >60s 0 0 15.5 2.76/9/2017 1130 >60s >60s 0 0 15.2 4.5 12/13/2010 1131 >60s >60s 0 0 18.9 2.2 LG-2 3/11/2011 1345 >60s >60s 0 0 20.4 0.9 6/3/2011 1130 >60s >60s 0 0 19.5 2.3 10/12/2011 1145 >60s >60s 0 0 18.1 2.412/14/2011 1330 >60s >60s 0 0 18.6 2.2 3/8/2012 1145 >60s >60s 0 0 19.3 1.86/14/2012 1130 >60s >60s 0 0 18.5 2.4 9/26/2012 1215 >60s >60s 0 0 18.8 2.212/3/2012 1230 >60s >60s 0 0 19.2 2.0 3/27/2013 1230 >60s >60s 0 0 19.6 2.56/3/2013 1315 >60s >60s 0 0 16.8 3.39/17/2013 1140 >60s >60s 0 0 17.5 3.7 12/11/2013 1215 >60s >60s 0 0 17.3 3.23/13/2014 1230 >60s >60s 0 0 19.3 2.7 6/5/2014 1245 >60s >60s 0 0 17.0 3.09/30/2014 1145 >60s >60s 0 0 16.7 3.9 12/19/2014 1115 >60s >60s 0 0 16.9 3.53/17/2015 1140 >60s >60s 0 0 17.1 2.9 6/19/2015 1230 >60s >60s 0 0 18.1 2.89/14/2015 1415 >60s >60s 0 0 19.6 0.812/1/2015 1145 >60s >60s 0 0 17.1 3.4 3/15/2016 1230 >60s >60s 0 0 18.6 1.36/29/2016 1230 >60s >60s 0 0 18.5 2.4 9/16/2016 1215 >60s >60s 0 0 16.9 3.212/30/2016 1115 >60s >60s 0 0 20.9 2.2 3/24/2017 1100 >60s >60s 0 0 18.2 1.56/9/2017 1200 >60s >60s 0 0 19.5 2.1 % LEL % O2 % CO2 Table 4 Landfill Gas Sampling Data Former BASF Industrial Landfill Enka, North Carolina LFG SAMPLE Sample Sample Tube Time % CH4WELL ID DATE Time Purge Pumped By Volume % LEL % O2 % CO2 12/13/2010 1136 >60s >60s 0 0 18.6 3.2LG-3 3/11/2011 1400 >60s >60s 0 0 19.7 2.1 6/3/2011 1200 >60s >60s 0 0 17.4 3.4 10/12/2011 1200 >60s >60s 0 0 17.8 3.0 12/14/2011 1345 >60s >60s 0 0 18.0 2.9 3/8/2012 1230 >60s >60s 0 0 18.4 2.86/14/2012 1200 >60s >60s 0 0 18.8 2.5 9/26/2012 1230 >60s >60s 0 0 18.6 2.712/3/2012 1245 >60s >60s 0 0 18.9 2.9 3/27/2013 1245 >60s >60s 0 0 20.4 2.46/3/2013 1230 >60s >60s 0 0 16.8 3.2 9/17/2013 1150 >60s >60s 0 0 17.4 3.812/11/2013 1230 >60s >60s 0 0 17.5 3.73/13/2014 1300 >60s >60s 0 0 20.1 2.5 6/5/2014 1300 >60s >60s 0 0 17.7 3.19/30/2014 1200 >60s >60s 0 0 16.9 3.5 12/19/2014 1145 >60s >60s 0 0 16.5 4.03/17/2015 1150 >60s >60s 0 0 18.5 2.6 6/19/2015 1245 >60s >60s 0 0 17.5 3.39/14/2015 1430 >60s >60s 0 0 18.2 2.5 12/1/2015 1200 >60s >60s 0 0 17.5 3.63/15/2016 1245 >60s >60s 0 0 16.7 2.96/29/2016 1245 >60s >60s 0 0 17.9 3.1 9/16/2016 1230 >60s >60s 0 0 17.1 3.812/30/2016 1145 >60s >60s 0 0 20.5 2.6 3/24/2017 1115 >60s >60s 0 0 17.5 2.26/9/2017 1230 >60s >60s 0 0 18.9 2.4 12/13/2010 1143 >60s >60s 0 0 16.6 5.5 LG-4 3/11/2011 1415 >60s >60s 0 0 18.8 2.8 6/3/2011 1230 >60s >60s 0 0 17.8 3.2 10/12/2011 1230 >60s >60s 0 0 14.1 5.412/14/2011 1400 >60s >60s 0 0 13.9 5.3 3/8/2012 1245 >60s >60s 0 0 16.8 4.26/14/2012 1215 >60s >60s 0 0 16.4 4.4 9/26/2012 1245 >60s >60s 0 0 16.5 4.612/3/2012 1300 >60s >60s 0 0 15.5 5.9 3/27/2013 1300 >60s >60s 0 0 19.9 3.26/3/2013 1430 >60s >60s 0 0 16.0 4.29/17/2013 1200 >60s >60s 0 0 12.9 6.4 12/11/2013 1245 >60s >60s 0 0 15.4 5.73/13/2014 1330 >60s >60s 0 0 19.7 3.3 6/5/2014 1330 >60s >60s 0 0 14.7 4.29/30/2014 1230 >60s >60s 0 0 13.9 5.4 12/19/2014 1230 >60s >60s 0 0 14.1 5.23/17/2015 1200 >60s >60s 0 0 18.4 3.3 6/19/2015 1300 >60s >60s 0 0 17.8 3.29/14/2015 1445 >60s >60s 0 0 16.2 4.612/1/2015 1230 >60s >60s 0 0 15.5 5.6 3/15/2016 1300 >60s >60s 0 0 17.1 3.06/29/2016 1300 >60s >60s 0 0 17.7 3.4 9/16/2016 1300 >60s >60s 0 0 15.8 4.912/30/2016 1200 >60s >60s 0 0 17.0 3.4 3/24/2017 1130 >60s >60s 0 0 16.1 4.06/9/2017 1300 >60s >60s 0 0 13.4 5.4 Table 4 Landfill Gas Sampling Data Former BASF Industrial Landfill Enka, North Carolina LFG SAMPLE Sample Sample Tube Time % CH4WELL ID DATE Time Purge Pumped By Volume % LEL % O2 % CO2 12/13/2010 1159 >60s >60s 0 0 14.2 6.7LG-5 3/11/2011 1430 >60s >60s 0 0 15.6 5.7 6/3/2011 1300 >60s >60s 0 0 16.1 5.5 10/12/2011 1300 >60s >60s 0 0 15.6 5.2 12/14/2011 1430 >60s >60s 0 0 15.9 5.4 3/8/2012 1330 >60s >60s 0 0 14.6 6.16/14/2012 1245 >60s >60s 0 0 14.8 5.9 9/26/2012 1300 >60s >60s 0 0 14.2 6.012/3/2012 1330 >60s >60s 0 0 15.1 7.03/27/2013 1330 >60s >60s 0 0 14.7 6.0 6/3/2013 1500 >60s >60s 0 0 15.1 5.79/17/2013 1230 >60s >60s 0 0 15.5 4.9 12/11/2013 1330 >60s >60s 0 0 17.0 5.53/13/2014 1400 >60s >60s 0 0 15.2 5.6 6/5/2014 1400 >60s >60s 0 0 17.6 4.89/30/2014 1300 >60s >60s 0 0 17.4 5.0 12/19/2014 1300 >60s >60s 0 0 17.1 5.1 3/17/2015 1230 >60s >60s 0 0 15.1 5.46/19/2015 1330 >60s >60s 0 0 14.6 5.8 9/14/2015 1500 >60s >60s 0 0 18.8 1.912/1/2015 1300 >60s >60s 0 0 17.1 5.3 3/15/2016 1330 >60s >60s 0 0 15.5 4.36/29/2016 1330 >60s >60s 0 0 14.9 5.2 9/16/2016 1330 >60s >60s 0 0 16.9 5.512/30/2016 1230 >60s >60s 0 0 19.7 2.73/24/2017 1200 >60s >60s 0 0 15.5 4.3 6/9/2017 1400 >60s >60s 0 0 15.2 4.512/13/2010 1207 >60s >60s 0 0 18.9 2.1 3/11/2011 1500 >60s >60s 0 0 19.8 1.8LG-6 6/3/2011 1320 >60s >60s 0 0 19.4 1.6 10/12/2011 1000 >60s >60s 0 0 16.3 4.4 12/14/2011 1115 >60s >60s 0 0 16.7 4.9 3/8/2012 1400 >60s >60s 0 0 18.1 3.26/14/2012 1330 >60s >60s 0 0 17.6 3.49/26/2012 1330 >60s >60s 0 0 17.5 3.5 12/3/2012 1400 >60s >60s 0 0 20.2 1.53/27/2013 1400 >60s >60s 0 0 17.9 3.5 6/3/2013 1530 >60s >60s 0 0 17.4 3.69/17/2013 1300 >60s >60s 0 0 20.5 0.9 12/11/2013 1400 >60s >60s 0 0 19.6 1.23/13/2014 1430 >60s >60s 0 0 18.0 3.2 6/5/2014 1430 >60s >60s 0 0 18.1 3.0 9/30/2014 1330 >60s >60s 0 0 19.0 1.512/19/2014 1330 >60s >60s 0 0 18.9 1.7 3/17/2015 1300 >60s >60s 0 0 17.8 3.36/19/2015 1400 >60s >60s 0 0 17.6 3.4 9/14/2015 1530 >60s >60s 0 0 17.4 3.412/1/2015 1330 >60s >60s 0 0 19.5 1.3 3/15/2016 1400 >60s >60s 0 0 17.9 2.16/29/2016 1400 >60s >60s 0 0 17.5 3.19/16/2016 1400 >60s >60s 0 0 18.9 2.2 12/30/2016 1300 >60s >60s 0 0 19.8 2.73/24/2017 1230 >60s >60s 0 0 17.6 2.3 6/9/2017 1430 >60s >60s 0 0 17.4 2.5 Table 4 Landfill Gas Sampling Data Former BASF Industrial Landfill Enka, North Carolina LFG SAMPLE Sample Sample Tube Time % CH4WELL ID DATE Time Purge Pumped By Volume % LEL % O2 % CO2 12/13/2010 1215 >60s >60s 0 0 19.4 1.1 3/11/2011 1515 >60s >60s 0 0 17.9 1.1 6/3/2011 1345 >60s >60s 0 0 17.8 1.3 LG-7 10/12/2011 1015 >60s >60s 0 0 17.9 2.2 12/14/2011 1100 >60s >60s 0 0 18.3 1.5 3/8/2012 1000 >60s >60s 0 0 18.7 2.26/14/2012 1030 >60s >60s 0 0 18.1 3.0 9/26/2012 1030 >60s >60s 0 0 18.0 2.912/3/2012 1030 >60s >60s 0 0 19.9 1.3 3/27/2013 1030 >60s >60s 0 0 21.9 0.36/3/2013 1115 >60s >60s 0 0 19.0 0.4 9/17/2013 1000 >60s >60s 0 0 18.9 2.312/11/2013 1100 >60s >60s 0 0 20.2 0.23/13/2014 1000 >60s >60s 0 0 19.1 2.4 6/5/2014 1100 >60s >60s 0 0 18.9 1.99/30/2014 1000 >60s >60s 0 0 18.1 1.9 12/19/2014 1000 >60s >60s 0 0 18.4 1.63/17/2015 1030 >60s >60s 0 0 19.9 1.0 6/19/2015 1100 >60s >60s 0 0 18.8 1.89/14/2015 1300 >60s >60s 0 0 19.0 2.2 12/1/2015 1000 >60s >60s 0 0 19.2 1.53/15/2016 1430 >60s >60s 0 0 19.0 1.26/29/2016 1415 >60s >60s 0 0 18.6 2.0 9/16/2016 1030 >60s >60s 0 0 18.4 5.312/30/2016 1330 >60s >60s 0 0 20.7 1.0 3/24/2017 1300 >60s >60s 0 0 17.4 2.66/9/2017 1330 >60s >60s 0 0 17.1 2.9 12/13/2010 1222 >60s >60s 0 0 18.0 2.9 3/11/2011 1530 >60s >60s 0 0 13.9 3.6 LG-8 6/3/2011 1430 >60s >60s 0 0 16.2 3.5 10/12/2011 1030 >60s >60s 0 0 16.2 3.112/14/2011 1145 >60s >60s 0 0 15.9 3.0 3/8/2012 1030 >60s >60s 0 0 19.1 1.96/14/2012 1040 >60s >60s 0 0 18.3 2.6 9/26/2012 1100 >60s >60s 0 0 18.2 2.412/3/2012 1050 >60s >60s 0 0 19.2 2.4 3/27/2013 1045 >60s >60s 0 0 18.7 2.46/3/2013 1145 >60s >60s 0 0 16.4 4.29/17/2013 1015 >60s >60s 0 0 18.3 4.1 12/11/2013 1115 >60s >60s 0 0 17.7 3.23/13/2014 1030 >60s >60s 0 0 19.1 2.3 6/5/2014 1115 >60s >60s 0 0 18.5 2.99/30/2014 1015 >60s >60s 0 0 16.2 4.4 12/19/2014 1010 >60s >60s 0 0 16.5 4.13/17/2015 1045 >60s >60s 0 0 17.4 2.7 6/19/2015 1115 >60s >60s 0 0 18.3 2.59/14/2015 1310 >60s >60s 0 0 18.4 2.312/1/2015 1015 >60s >60s 0 0 17.6 3.3 3/15/2016 1000 >60s >60s 0 0 17.2 1.96/29/2016 1000 >60s >60s 0 0 18.2 2.1 9/16/2016 1100 >60s >60s 0 0 18.4 4.612/30/2016 1000 >60s >60s 0 0 19.6 2.2 3/24/2017 930 >60s >60s 0 0 17.3 1.96/9/2017 1045 >60s >60s 0 0 14.2 8.0 Table 4 Landfill Gas Sampling Data Former BASF Industrial Landfill Enka, North Carolina LFG SAMPLE Sample Sample Tube Time % CH4WELL ID DATE Time Purge Pumped By Volume % LEL % O2 % CO2 12/13/2010 1227 >60s >60s 0 0 18.1 3.1 3/11/2011 1545 >60s >60s 0 0 17.9 1.8 6/3/2011 1500 >60s >60s 0 0 17.5 2.1 LG-9 10/12/2011 1040 >60s >60s 0 0 17.2 3.4 12/14/2011 1215 >60s >60s 0 0 17.5 3.5 3/8/2012 1100 >60s >60s 0 0 20.7 0.46/14/2012 1050 >60s >60s 0 0 19.9 1.2 9/26/2012 1115 >60s >60s 0 0 19.7 1.212/3/2012 1100 >60s >60s 0 0 19.5 2.9 3/27/2013 1100 >60s >60s 0 0 22.2 0.26/3/2013 1200 >60s >60s 0 0 14.0 2.5 9/17/2013 1030 >60s >60s 0 0 15.3 4.412/11/2013 1130 >60s >60s 0 0 17.4 3.33/13/2014 1100 >60s >60s 0 0 21.6 1.5 6/5/2014 1130 >60s >60s 0 0 15.8 2.79/30/2014 1045 >60s >60s 0 0 15.3 4.2 12/19/2014 1020 >60s >60s 0 0 15.5 4.03/17/2015 1100 >60s >60s 0 0 16.4 3.1 6/19/2015 1130 >60s >60s 0 0 15.2 4.39/14/2015 1320 >60s >60s 0 0 18.0 3.7 12/1/2015 1035 >60s >60s 0 0 17.2 3.13/15/2016 1030 >60s >60s 0 0 19.1 0.86/29/2016 1025 >60s >60s 0 0 15.3 4.2 9/16/2016 1115 >60s >60s 0 0 17.6 4.912/30/2016 1015 >60s >60s 0 0 20.9 2.3 3/24/2017 945 >60s >60s 0 0 18.1 1.86/9/2017 1100 >60s >60s 0 0 13.2 4.5 12/13/2010 1235 >60s >60s 0 0 15.5 5.8 3/11/2011 1600 >60s >60s 0 0 16.8 4.7 LG-10 6/3/2011 1515 >60s >60s 0 0 17.1 3.8 10/12/2011 1100 >60s >60s 0 0 14.9 5.612/14/2011 1230 >60s >60s 0 0 14.2 5.7 3/8/2012 1115 >60s >60s 0 0 14.9 5.06/14/2012 1100 >60s >60s 0 0 14.7 4.9 9/26/2012 1130 >60s >60s 0 0 14.6 4.812/3/2012 1130 >60s >60s 0 0 16.0 5.8 3/27/2013 1130 >60s >60s 0 0 16.8 4.46/3/2013 1345 >60s >60s 0 0 14.9 4.59/17/2013 1100 >60s >60s 0 0 10.9 8.5 12/11/2013 1145 >60s >60s 0 0 13.2 6.93/13/2014 1130 >60s >60s 0 0 16.6 5.9 6/5/2014 1200 >60s >60s 0 0 15.0 5.19/30/2014 1100 >60s >60s 0 0 12.4 7.6 12/19/2014 1030 >60s >60s 0 0 12.9 7.03/17/2015 1110 >60s >60s 0 0 14.6 5.4 6/19/2015 1200 >60s >60s 0 0 16.8 5.79/14/2015 1330 >60s >60s 0 0 17.8 3.012/1/2015 1100 >60s >60s 0 0 14.2 5.9 3/15/2016 1100 >60s >60s 0 0 13.8 4.16/29/2016 1105 >60s >60s 0 0 16.9 5.5 9/16/2016 1130 >60s >60s 0 0 15.2 5.312/30/2016 1030 >60s >60s 0 0 18.7 4.3 3/24/2017 1000 >60s >60s 0 0 14.4 3.76/9/2017 1115 >60s >60s 0 0 15.1 5.6 Notes: Landfill gas data were collected using a calibrated Landtec GEM 2000+.CH4 = Methane; O2 = Oxygen; CO2 = Carbon Dioxide; LEL = Lower Explosive Limit; 5% CH4 = 100 % LEL FIGURES Figure 1 – Groundwater Elevations Semi-Annual Sampling Event – April 26, 2017 Source: Google Earth Scale: 1” = 200’ Site Name: BASF Closed Industrial Landfill Enka, North Carolina MW-5 (2049.67) MW-6 (Unknown) MW-4R (2056.61) Monitoring Well Groundwater Elevation (2049.67) MW-3 (Unknown) Hominy Creek Permitted Facility Boundary Note: TOC elevations for MW-3 and MW-6 are currently unknown due to unauthorized alterations made to these wells. Figure 2 – Surface Water Sample Locations Semi-Annual Sampling Event – April 26-27, 2017 Source: Google Earth (2013) Scale: 1” = 350’ Site Name: BASF Closed Industrial Landfill Enka, North Carolina Surface Water Sample Location Hominy Creek Permitted Facility Boundary SW-1 DW-2 Seep-1 M W - 4 P P c L I M I T O F W A S T E S E D I M E N T A T I O N B A S I N c P N E W P E R M I T T E D F A C I L I T Y B O U N D A R Y ( S E E N O T E S ) M W - 6 M W - 3 M W - 5 B O U N D A R Y L I N E S O F S O L I D W A S T E P E R M I T N O . 1 1 - 0 2 L G - 1 L G - 2 L G - 3 L G - 4 L G - 5 L G - 6 L G - 7 L G - 8 L G - 9 L G - 1 0 E X T E N T O F L A N D F I L L W A S T E E N K A - B U N C O M B E C O U N T Y C L O S E D B A S F I N D U S T R I A L L A N D F I L L P L A N R E V I S I O N S F I G U R E - 3 S C A L E : 1 " = 1 0 0 ' D A T E : 0 9 - 0 9 - 1 0 E L M S i t e S o l u t i o n s , I n c . P . O . B O X 9 7 6 0 7 R a l e i g h , N o r t h C a r o l i n a 2 7 6 2 4 P h o n e : ( 9 1 9 ) 7 9 2 - 3 7 3 3 P R O J E C T : 1 0 0 7 - 1 0 - 0 0 8 T h i s d r a w i n g i s t h e p r o p e r t y o f E L M S i t e S o l u t i o n s , I n c a n d i s n o t t o b e r e p r o d u c e d o r c o p i e d i n w h o l e o r i n p a r t . I t i s o n l y t o b e u s e d f o r t h e p r o j e c t a n d s i t e s p e c i f i c a l l y i d e n t i f i e d h e r e i n a n d i s n o t t o b e u s e d o n a n y o t h e r p r o j e c t . I t i s t o b e r e t u r n e d u p o n r e q u e s t . N O . D A T E D E S C R I P T I O N S A N D H I L L R O A D N O R T H C A R O L I N A E X I S T I N G T R E E L I N E N E W L A N D F I L L G A S E X I S T I N G P O W E R L I N E E X I S T I N G M I N O R C O N T O U R E X I S T I N G M O N I T O R I N G W E L L E X I S T I N G M A J O R C O N T O U R L E G E N D P E X I S T I N G F E N C E X X X P E R M I T T E D L A N D F I L L V O L U M E = 4 0 6 4 6 0 C U B I C Y A R D S N O T E S A R E A W I T H I N O R I G I N A L S O L I D W A S T E P E R M I T B O U N D A R Y = 2 8 . 1 3 A C R E S O R I G I N A L T O P O G R A P H I C S U R V E Y D A T A A N D S I T E I N F O R M A T I O N P R O V I D E D F R O M A S U R V E Y M A P T I T L E D T O P O G R A P H I C S U R V E Y - A P R I L 2 0 0 3 B A S F C O R P O R A T I O N I N D U S T R I A L L A N D F I L L , E N K A , N . C . , D R A W I N G N O . 9 7 0 5 3 - 4 _ 1 _ 0 3 ; P R E P A R E D B Y C . O . H A M P T O N C O M P A N Y - L A N D S U R V E Y O R S , P . O . D R A W E R 1 3 1 9 , F L E T C H E R , N . C . A R E A W I T H I N N E W S O L I D W A S T E P E R M I T B O U N D A R Y = 4 1 . 7 5 A C R E S A S - B U I L T S U R V E Y D A T A A N D S I T E I N F O R M A T I O N P R O V I D E D F R O M A S U R V E Y M A P T I T L E D S U R V E Y O F S O L I D W A S T E L A N D F I L L , P E R M I T N O . 1 1 - 0 2 , C O L B O N D A C Q U I S I T I O N I I N C . ; D R A W I N G N O . 0 5 1 6 7 F I N A L - V 2 0 0 0 ; P R E P A R E D B Y 2 7 7 8 , A S H E V I L L E , N . C . N E W P E R M I T T E D F A C I L I T Y B O U N D A R Y R E Q U I R E D P E R N C D E N R L E T T E R D A T E D A P R I L 1 , 2 0 0 4 . B E T H B . G I L L A M , P . L . S . , O F H U T C H I S O N - B I G G S & A S S O C I A T E S , I N C . , P . O . B O X M W - 2 A B A N D O N E D O N A P R I L 2 3 , 2 0 0 9 I N A C C O R D A N C E W I T H 1 5 A N C A C 2 C . 0 1 1 3 . M W - 6 I N S T A L L E D O N A P R I L 2 3 , 2 0 0 9 . T B M - T E M P O R A R Y B E N C H M A R K S L A N D F I L L G A S M O N I T O R I N G W E L L L O C A T I O N S A R E A P P R O X I M A T E . F I N A L L O C A T I O N S W I L L B E I N F L U E N C E D B Y A C C E S S A N D O T H E R P O T E N T I A L I M P E D I M E N T S . A N A S - B U I L T S U R V E Y W I L L B E C O M P L E T E D O N C E F I N A L I N S T A L L A T I O N S A R E C O M P L E T E . S I T E L O C A T I O N - N . T . S . I - 4 0 H W Y - 1 9 / 2 3 S A N D H I L L R D S I T E M O N I T O R I N G W E L L S APPENDICES APPENDIX A FIELD SAMPLE COLLECTION RECORDS APPENDIX B LANDFILL GAS MONITORING DATA FORMS APPENDIX C LABORATORY ANALYTICAL REPORT