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HomeMy WebLinkAbout0403_Chambers_MSWLF_GWMR_20170602 Groundwater Statistical Analysis Report First Semi-Annual 2017 Sampling Event Anson Waste Management Facility Chambers Development of NC, Inc. Polkton, North Carolina June 2017 Prepared by: 10 Quiet Brook Court 314-496-4654 St. Charles, MO 63303 www.jettenviro.com TABLE OF CONTENTS 1.0 INTRODUCTION .............................................................................1  2.0 SITE BACKGROUND AND MONITORING NETWORK ................1  3.0 SITE HYDROGEOLOGY ................................................................2  4.0 DATA EVALUATION ......................................................................2  5.0 STATISTICAL PROCEDURES .......................................................3  5.1 Outlier Analysis ...........................................................................3  5.2 Intra-Well Prediction Intervals ....................................................4  5.3 Statistical Results Summary .......................................................4  6.0 CONCLUSIONS ..............................................................................4  TABLES Table 1 Groundwater Monitoring Program Table 2 Groundwater Analytical Data Summary Table 3 Surface Water Analytical Data Summary Table 4 Enhanced Liner System & Leachate Analytical Data Summary APPENDICES Appendix A Potentiometric Surface Maps Appendix B Statistical Evaluations Appendix C Laboratory Analytical Reports & Field Sampling Forms Groundwater Statistical Analysis Report Anson Waste Management Facility, North Carolina 1 1.0 INTRODUCTION On behalf of Chambers Development of North Carolina, Inc.-Anson Waste Management Facility, Jett Environmental Consulting statistically evaluated the First Semi-Annual 2017 groundwater data. Sampling was performed by S&ME and analytical testing was performed by Environmental Conservation Laboratories, Inc. The statistical analysis software package utilized, SanitasTM, follows a documented decision logic that incorporates the following applicable document: USEPA “Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Unified Guidance” (March 2009). 2.0 SITE BACKGROUND AND MONITORING NETWORK Per the site’s Statistical Analysis Plan dated July 2001 by Herst & Associates, Inc. and in compliance with North Carolina Department of Environmental Quality (NCDEQ) Solid Waste Management Regulations, Section .1600 “Requirements for Municipal Solid Waste Landfill Facilities,” Jett Environmental Consulting statistically evaluated parameters from the First Semi-Annual 2017 event using intra-well prediction interval analysis. Prediction intervals are considered a powerful tool for groundwater statistical analysis, when feasible, due to their inherent low false negative and false positive rates utilizing confirmatory resampling, if necessary. Background is defined as samples collected from each well from October 2000 through the October 2015 event. Background will generally be reviewed every two to three years to determine if more recent data can be added to the background pool of data. The parameters subject to statistical evaluation during detection monitoring are noted in NCDEQ Section .1633 as constituents listed in Appendix I of 40 CFR Part 258 “Appendix I Constituents for Detection Monitoring”. Table 1 lists the site’s groundwater monitoring wells. Per September 28, 2012 NCDEQ correspondence, approval was granted to sample the six Shallow zone wells on a semi-annual basis, with the groundwater elevations monitored in Deep zone wells on a semi- annual basis. The approval was under the condition that a groundwater sample be collected from a Deep zone well if its accompanying Shallow zone well did not contain enough water to yield a sample. Each of the Shallow zone wells was able to be sampled during the First Semi-Annual 2017 event. Due to anomalous results for total metals at MW-2S during the Second Semi-Annual 2007 (October 2007) and Second Semi-Annual 2009 (November 2009) events, data from these dates are not utilized in the background data set for intra-well statistical analyses of MW-2S. In addition to groundwater monitoring, the site has a surface water monitoring network consisting of the following points: Upstream Pinch Gut Creek Upstream (BG-1) Brown Creek Upstream (BG-2) Downstream Brown Creek Downstream (SG-3) Pinch Gut Creek Downstream (SG-4) The four surface water sampling points are sampled semi-annually for the 40 CFR Part 258 Appendix I list in conjunction with the groundwater monitoring wells. During permitting of Phase 2, a sampling station (SG-5) was added at the outlet of an underdrain built below Phase 2B (beneath the north side of Phase 2A and the south side of Phase 2B). Two additional underdrain sampling stations were added during Summer 2016: Underdrain Combo 1E/2E and Underdrain 2C-North. SG-5, Underdrain Combo 1E/2E, and Underdrain 2C-North are to be sampled semi-annually (contingent Groundwater Statistical Analysis Report Anson Waste Management Facility, North Carolina 2 on flow availability) for the 40 CFR Part 258 Appendix I list. Each of the surface water points was able to be sampled during the First Semi-Annual 2017 event, with the exception of Underdrain 2C-North, which was dry (no flow) and not sampled. A leachate sample is also collected semi-annually for analysis in accordance with the facility’s permit. The leachate sample is analyzed for the 40 CFR Part 258 Appendix I list, biochemical oxygen demand, chemical oxygen demand, nitrate as N, pH, phosphorous, specific conductance, and sulfate. A leachate sample was able to be sampled during the First Semi-Annual 2017 event. According to the October 2008 plan prepared by David Garrett and Associates and titled “Water Quality Monitoring Plan,” two Enhanced Liner System (ELS) sumps (#5 and #7) are to be sampled if liquids are present. The ELS sumps are sampled semi-annually for the 40 CFR Part 258 Appendix I list. ELS sump #5 and #7 were able to be sampled during the First Semi-Annual 2017 event. 3.0 SITE HYDROGEOLOGY The following site hydrogeology summary was taken from a document titled Baseline Sampling Report, Anson Waste Management Facility, dated June 2001 by Almes & Associates, Inc. The site is located in the Piedmont Physiographic province within the Triassic-age Wadesboro basin. In general, the lithology of the site is composed of saprolitic soils and partially weathered rocks grouped together as “overburden” and competent bedrock. Three rock types comprise the bedrock at the site; Triassic sediments of the Wadesboro basin (Chatham Group), bedded argillites of the Carolina Slate belt (Floyd Church Formation), and diabase units in two north-west trending features (dikes). The three bedrock types and overburden appear to have similar hydraulic characteristics and behave as equivalent to a porous granular media at site scale. As a result, the direction of groundwater flow should be largely controlled by site topography. The groundwater monitoring system at the site has been designed to monitor groundwater within both the overburden and the bedrock. Those monitoring wells designated with an “S”-suffix are screened within the overburden to monitor the shallow groundwater and those wells designated with a “D”-suffix are deeper wells screened within the bedrock. Based on data obtained during previous hydrogeologic investigations at that site, it was determined that the geologic units were in communication, the groundwater flow pattern appears to be controlled by topography, and the subsurface may be represented as a porous granular media. The location and completed intervals for monitoring wells MW-1D and MW-6D were selected specifically to collect background and downgradient water quality data, respectively, from the diabase dikes at the site. Appendix A provides potentiometric surface maps and groundwater flow calculations for the Shallow zone and Deep zone utilizing groundwater level data from the First Semi-Annual 2017 event. Groundwater flow direction for the First Semi-Annual 2017 event was to the northeast in both zones, consistent with past events. Groundwater flow rate for the First Semi-Annual 2017 event was estimated to range from 77 feet/year in the Shallow zone to 36 feet/year in the Deep zone. 4.0 DATA EVALUATION Appendix C contains a copy of the laboratory analytical reports and field log sheets for the First Semi- Annual 2017 event for the groundwater, surface water, leachate, and ELS sump samples. Groundwater The analytical results for the First Semi-Annual 2017 event for the groundwater samples are summarized on Table 2. No volatile organic compounds (VOCs) were detected at or above the NC Solid Waste Section Reporting Limits (SWSLs) in groundwater samples. As shown on Table 2, a few NC Appendix I inorganic constituents were detected in samples from one or more wells at concentrations above their respective NC Groundwater Statistical Analysis Report Anson Waste Management Facility, North Carolina 3 Solid Waste Section Reporting Limits (SWSLs). Of the detections, only the following Appendix I constituents were detected above an SWSL and NC Solid Waste Section Groundwater Protection Standard (NC GWPS) or NC 2L Groundwater Standard (NC 2L) during the First Semi-Annual 2017 sampling event: barium at MW-8S and chromium at MW-4S. Therefore, barium at MW-8S and chromium at MW-4S were statistically evaluated to determine if concentrations exhibit statistically significant increases (see Section 5.2). Surface Water The analytical results for the First Semi-Annual 2017 event for the surface water samples are summarized on Table 3. During the First Semi-Annual 2017 event, no Appendix I VOCs were detected in surface water samples at quantified concentrations above their respective NC SWSLs. No Appendix I inorganic constituents were reported above an NC 2B Surface Water Standard during the First Semi-Annual 2017 event, with the exception of copper at SG-4. The First Semi-Annual 2017 copper concentration at SG-4 (0.0168 mg/L) was above the NC 2B Standard (0.003 mg/L), however was within the range of historical copper results from upstream BG-1 (0.00042 to 0.077 mg/L) and upstream BG-2 (0.00052 to 0.031 mg/L). Leachate During the First Semi-Annual 2017 event, a sample was collected from the leachate collection system. The leachate sample results are summarized on Table 4. Enhanced Liner System According to the October 2008 plan prepared by David Garrett and Associates and titled “Water Quality Monitoring Plan,” an evaluation is to be made semi-annually of the volume of free liquid removed from the Enhanced Liner System (ELS) sump. The results of the evaluation and the VOC analysis of the ELS sump liquids are to be included in the semi-annual groundwater report. The analytical results for the First Semi- Annual 2017 event for the ELS sump samples are summarized on Table 4. According to site personnel, liquids were present at ELS sumps #5 and #7 during the last six month monitoring period. A sample was collected from ELS sumps #5 and #7 during the First Semi-Annual 2017 event and analyzed for the required VOCs. Liquids that are present in ELS sumps #5 and #7 are pumped to the leachate collection/disposal system and managed as leachate. As shown on Table 4, low-level VOCs were detected in the ELS sump samples, consistent with previous events. Total metals are also sampled at the ELS sumps to supplement the VOC analyses (see Table 4). According to the site, from November 2016 through April 2017, the total volume of liquids measured in ELS sumps #5 and #7 was 6 gallons and 6,024 gallons, respectively. 5.0 STATISTICAL PROCEDURES The following Appendix I constituents were detected above the SWSL and NC GWPS/NC 2L standard during the First Semi-Annual 2017 sampling event: barium at MW-8S and chromium at MW-4S. Statistical analyses (i.e. intra-well prediction limits) were performed to establish background concentrations and determine if the NC GWPS/NC 2L value-to-value exceedance exhibited a statistically significant increase in the Shallow zone. 5.1 Outlier Analysis The background data were evaluated for the presence of statistical outliers. Methodologies for determining a statistical outlier are defined in the EPA document, Statistical Analysis of Ground-Water Monitoring Data at RCRA Facilities – Unified Guidance (March 2009). Any statistical outliers that were determined were removed from the background data set prior to performing prediction interval statistical analysis. According to the EPA guidance documents above, data that are not normally or log-normally distributed are not Groundwater Statistical Analysis Report Anson Waste Management Facility, North Carolina 4 recommended for evaluation of outliers. In cases where the data were not normally or log-normally distributed, outliers were not removed from the data set. Background outliers flagged for removal are identified on the statistical plots provided in Appendix B for the Shallow zone. 5.2 Intra-Well Prediction Intervals The prediction interval is a statistical method used to compare a single observation to a group of observations. The prediction interval is calculated to include observations from the same population with a specified confidence. In groundwater monitoring, a prediction interval approach may be used to make comparisons between background and compliance data. The interval is developed to contain all future observations, within a certain probability. For the Anson Waste Management site, intra-well prediction intervals have been developed based on a 99% confidence that future observations will fall within the range. If any future observation exceeds the prediction interval, this is considered statistically significant evidence that the observation is not representative of the background group. During parametric prediction interval analysis, the mean and the standard deviation are calculated for the raw or transformed background data. The number of comparison observations, K, is defined to be included in the interval. If less than 15% of the background observations are nondetects, the nondetects are replaced with one half of the reporting limit prior to performing the analysis. If more than 15% but less than 50% of the background data are below the reporting limit, the data’s sample mean and standard deviation are adjusted according to the Kaplan-Meier method. However, when the background data are not transformed- normal or contain greater than 50% observations below the reporting limit, SanitasTM automatically constructs a non-parametric prediction interval. During non-parametric analysis, the highest value from the background data is used to set the upper limit of the prediction interval. Prediction interval summary tables are presented in Appendix B for the Shallow zone. Included in Appendix B are time series plots for each of the parameters statistically analyzed for this reporting period. 5.3 Statistical Results Summary For the First Semi-Annual 2017 event, no statistical exceedances were exhibited in the Shallow zone wells. During the First Semi-Annual 2017 event, no volatile organic compounds (VOCs) were detected above the North Carolina Solid Waste Section Limits (SWSLs) in groundwater samples. 6.0 CONCLUSIONS For the First Semi-Annual 2017 event, no statistical exceedances were exhibited in the Shallow zone wells. During the First Semi-Annual 2017 event, no VOCs were detected above the NC SWSLs in groundwater samples. During the First Semi-Annual 2017 event, no Appendix I VOCs were detected in surface water samples at quantified concentrations above their respective NC SWSLs. No Appendix I inorganic constituents were reported above an NC 2B Surface Water Standard during the First Semi-Annual 2017 event, with the exception of copper at SG-4. The First Semi-Annual 2017 copper concentration at SG-4 (0.0168 mg/L) was above the NC 2B Standard (0.003 mg/L), however was within the range of historical copper results from upstream BG-1 (0.00042 to 0.077 mg/L) and upstream BG-2 (0.00052 to 0.031 mg/L). The site will continue monitoring in accordance with the requirements for Detection Monitoring as outlined in Title 15A NCAC 13B .1633. The next semi-annual event is tentatively scheduled for October 2017. TABLES ZONE UPGRADIENT WELLS DOWNGRADIENT WELLS MW-3S, MW-4S, MW-5S, MW-8S, MW-9 MW-3D, MW-4D, MW-5D, MW-8D Note: Deep Zone wells are for water levels only; sampling not required. Deep MW-1D, MW-2D TABLE 1 GROUNDWATER MONITORING PROGRAM FIRST SEMI-ANNUAL 2017 EVENT ANSON WASTE MANAGEMENT FACILITY Shallow MW-2S Constituent Units MDL MRL SWSL NC 2L Std NC GWPS MW-2S MW-3S MW-4S MW-5S MW-8S MW-9 Antimony Total ug/L 0.370 2.00 6 NE 1 0.370 U 0.370 U 0.370 U 0.370 U 0.370 U 3.15 J Arsenic Total ug/L 6.80 10.0 10 10 NE 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U Barium Total ug/L 1.00 10.0 100 700 NE 80.3 J 50.5 J 209 96.7 J 2520 499 Beryllium Total ug/L 0.130 1.00 1 NE 4 1.36 0.130 U 0.130 U 0.130 U 0.130 U 0.130 U Cadmium Total ug/L 0.360 1.00 1 2NE0.360 U 0.360 U 0.360 U 0.360 U 0.360 U 0.360 U Chromium Total ug/L 1.40 10.0 10 10 NE 1.40 U 2.78 J 10.6 5.73 J 1.40 U 3.64 J Cobalt Total ug/L 1.10 10.0 10 NE 1 3.07 J 6.23 J 1.10 U 1.91 J 1.10 U 1.10 U Copper Total ug/L 1.60 10.0 10 1,000 NE 4.05 J 2.99 J 4.11 J 2.53 J 1.60 U 1.83 J Lead Total ug/L 3.10 10.0 10 15 NE 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U Nickel Total ug/L 2.20 10.0 50 100 NE 4.82 J 3.76 J 9.34 J 8.83 J 7.54 J 3.40 J Selenium Total ug/L 0.910 3.00 10 20 NE 0.910 U 0.910 U 0.910 U 0.910 U 0.910 U 0.910 U Silver Total ug/L 1.90 10.0 10 20 NE 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U 1.90 UThallium Total ug/L 0.110 1.00 5.5 NE 0.28 0.142 J 0.232 J 0.236 J 0.252 J 0.110 U 0.190 J Vanadium Total ug/L 1.40 10.0 25 NE 0.3 1.40 U 3.53 J 5.84 J 6.50 J 1.40 U 4.41 JZinc Total ug/L 4.40 10.0 10 1,000 NE 5.77 J 7.05 J 19.4 10.0 4.40 U 6.79 J Field Dissolved Oxygen mg/L NA NA NA NE NE 2.18 0.61 3.46 3.07 4.11 5.26 Field pH SU NA NA NA NE NE 4.23 5.06 5.50 5.67 5.91 7.87 Field Specific Conductance uS/cm NA NA NA NE NE 200.7 192.0 167.9 224.7 1142.0 886.0 Field Temperature °C NA NA NA NE NE 17.0 16.6 17.7 16.9 17.5 18.1 Field Turbidity NTU NA NA NA NE NE 2.10 17.90 75.67 86.33 2.62 116.20 No VOCs were detected above an SWSL during this event. NE: Denotes a NC 2L Standard or NC GWPS is not established. J: Denotes Sample result above the MDL but below the Solid Waste Section Limit (SWSL); estimated value; value may not be accurate. U: Denotes Not-Detected. D: Denotes the sample was analyzed at Dilution. MDL: Denotes Laboratory Method Detection Limit. MRL: Denotes Laboratory Method Reporting Limit. GWPS: Denotes Groundwater Protection Standard. NA: Denotes Not Applicable. Denotes a concentration at or above an SWSL is also above the 2L Standard or GWPS: Field data are last recorded measurement during purging. TABLE 2 GROUNDWATER ANALYTICAL DATA FIRST SEMI-ANNUAL 2017 EVENT ANSON WASTE MANAGEMENT FACILITY Constituent Units NC 2B Standard MDL MRL SWSL BG-1 BG-2 SG-3 SG-4 SG-5 Underdrain Combo 1E/2E Underdrain 2C - North Antimony Total ug/L NE 0.370 2.00 6 0.370 U 0.370 U 0.370 U 0.370 U 0.370 U 0.370 U No Flow Arsenic Total ug/L 10 6.80 10.0 10 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U No Flow Barium Total ug/L 1,000 1.00 10.0 100 52.5 J 40.5 J 45.8 J 42.8 J 22.7 J 54.1 J No Flow Beryllium Total ug/L 6.5 0.130 1.00 1 0.130 U 0.130 U 0.130 U 0.130 U 0.130 U 0.130 U No Flow Cadmium Total ug/L 2 0.360 1.00 1 0.360 U 0.360 U 0.360 U 0.360 U 0.360 U 0.360 U No Flow Chromium Total ug/L 20 1.40 10.0 10 3.38 J 1.40 U 3.09 J 1.59 J 1.40 U 1.40 U No Flow Cobalt Total ug/L NE 1.10 10.0 10 1.30 J 3.30 J 1.41 J 1.10 U 52.8 4.73 J No Flow Copper Total ug/L 3 1.60 10.0 10 4.83 J 7.38 J 4.65 J 16.8 1.60 U 1.60 U No Flow Lead Total ug/L 25 3.10 10.0 10 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U No Flow Nickel Total ug/L 8.3 2.20 10.0 50 3.09 J 3.00 J 3.26 J 3.43 J 4.51 J 3.00 J No Flow Selenium Total ug/L 5 0.910 3.00 10 0.910 U 0.910 U 0.910 U 0.910 U 0.910 U 0.910 U No Flow Silver Total ug/L 0.06 1.90 10.0 10 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U No Flow Thallium Total ug/L NE 0.110 1.00 5.5 0.186 J 0.194 J 0.173 J 0.181 J 0.280 J 0.110 U No Flow Vanadium Total ug/L NE 1.40 10.0 25 7.48 J 2.09 J 5.62 J 2.96 J 1.40 U 1.40 U No Flow Zinc Total ug/L 50 4.40 10.0 10 7.47 J 5.47 J 7.47 J 4.82 J 9.20 J 4.40 U No Flow Field Dissolved Oxygen mg/L NE NA NA NA 7.51 4.85 6.37 5.44 3.61 1.68 No Flow Field pH SU NE NA NA NA 6.48 6.42 6.49 6.36 5.66 6.25 No Flow Field Specific Conductance uS/cm NE NA NA NA 69.6 122.0 90.4 119.9 194.500 101.6 No Flow Field Temperature °C NE NA NA NA 16.6 19.5 17.6 17.8 23.60 20.7 No Flow Field Turbidity NTU NE NA NA NA 47.35 17.98 37.78 15.34 0.05 4.77 No Flow No VOCs were detected above an SWSL during this event. NE: Denotes a NC 2B Standard is not established. J: Denotes Sample result above the MDL but below the Solid Waste Section Limit (SWSL); estimated value; value may not be accurate. U: Denotes Not-Detected. D: Denotes the sample was analyzed at Dilution. MDL: Denotes Laboratory Method Detection Limit. MRL: Denotes Laboratory Method Reporting Limit. For NC 2B Standard, lowest value utilized from the classifications from the 2B Table published May 15, 2013. NA: Denotes Not Applicable. Denotes a concentration at or above an SWSL is also above the 2B Standard: TABLE 3 SURFACE WATER ANALYTICAL DATA FIRST SEMI-ANNUAL 2017 EVENT ANSON WASTE MANAGEMENT FACILITY Constituent UNITS MDL MRL SWSL ELS #5 ELS #7 Antimony ug/l 3.70 20.0 6 3.70 U 3.70 U Arsenic ug/l 6.80 10.0 10 9.62 J 26.8 Barium ug/l 1.00 10.0 100 2280 3440 Beryllium ug/l 0.130 1.00 1 0.158 J 0.130 U Cadmium ug/l 0.360 1.00 1 0.360 U 0.787 J Chromium ug/l 1.40 10.0 10 17.8 18.4 Cobalt ug/l 1.10 10.0 10 37.9 28.1 Copper ug/l 1.60 10.0 10 639 544 Lead ug/l 3.10 10.0 10 3.10 U 4.07 J Nickel ug/l 2.20 10.0 50 247 272 Selenium ug/l 9.10 30.0 10 9.10 U 9.10 U Silver ug/l 1.90 10.0 10 1.90 U 1.90 U Thallium ug/l 1.10 10.0 5.5 1.10 U 1.10 U Vanadium ug/l 1.40 10.0 25 3.73 J 9.44 J Zinc ug/l 4.40 10.0 10 549 403 pH (field)SU NA NA NE 6.82 6.87 Specific Conductance (field) uS/cm NA NA NE 3,999 3,999 Chloroform ug/l 1.5 10 1 4.6 J 4.1 J Ethylbenzene ug/l 1.3 10 1 11 6.9 J Xylenes (Total) ug/l 4.5 30 5 28 J 10 J Constituent UNITS MDL MRL SWSL Leachate Ammonia as N mg/L 40 90 NE 1000 Antimony Total ug/L 3.70 20.0 6 13.1 J Arsenic Total ug/L 6.80 10.0 10 60.8 Barium Total ug/L 1.00 10.0 100 737 Beryllium Total ug/L 0.130 1.00 1 0.130 U Biochemical Oxygen Demand mg/L 2.0 2.0 NE 35 Cadmium Total ug/L 0.360 1.00 1 0.360 U Chemical Oxygen Demand mg/L 50 50 NE 2100 Chromium Total ug/L 1.40 10.0 10 222 Cobalt Total ug/L 1.10 10.0 10 49.4 Copper Total ug/L 1.60 10.0 10 12.8 Cyanide (total)mg/L 0.0049 0.010 10 0.0090 J Lead Total ug/L 3.10 10.0 10 13.3 Mercury Total ug/L 0.170 0.200 0.2 0.170 U Nickel Total ug/L 2.20 10.0 50 489 Nitrate as N mg/L 0.025 0.10 10000 0.025 U Nitrate/Nitrite as N mg/L 0.041 0.10 NE 0.15 Nitrite as N mg/L 0.017 0.10 1000 0.15 J Oil & Grease (HEM)mg/L 2.40 5.00 NE 2.40 U Orthophosphate as P mg/L 0.16 0.50 NE 1.9 Phenolics mg/L 0.034 0.050 NE 0.070 Phosphorus mg/L 0.12 0.50 NE 5.5 Selenium Total ug/L 9.10 30.0 10 9.10 U Silver Total ug/L 1.90 10.0 10 1.90 U Sulfate as SO4 mg/L 0.13 10 250000 13 J Thallium Total ug/L 1.10 10.0 5.5 1.10 U Total Kjeldahl Nitrogen mg/L 26 48 NE 830B Total Suspended Solids mg/L 10 10 NE 21 Vanadium Total ug/L 1.40 10.0 25 166 Zinc Total ug/L 4.40 10.0 10 410 pH (field)SU NA NA NE 6.71 Specific Conductance (field) uS/cm NA NA NE 3,999 Toluene ug/l 1.4 10 1 6.7 J Only the VOCs detected are included on this table. NE: Denotes an SWSL is not established. J: Denotes Sample result above the MDL but below the SWSL; estimated value; value may not be accurate. U: Denotes Not-Detected. MDL: Denotes Laboratory Method Detection Limit. MRL: Denotes Laboratory Method Reporting Limit. NA: Denotes Not Applicable. TABLE 4 ENHANCED LINER SYSTEM (ELS) & LEACHATE ANALYTICAL DATA FIRST SEMI-ANNUAL 2017 EVENT ANSON WASTE MANAGEMENT FACILITY APPENDICES APPENDIX A POTENTIOMETRIC SURFACE MAPS Well Top of PVC Casing Elevation (fmsl)1 Depth to Water (ft)2 Groundwater Elevation (fmsl) MW-2S 318.00 14.22 303.78 MW-3S 295.87 7.18 288.69 MW-4S 294.29 9.41 284.88 MW-5S 282.15 6.39 275.76 MW-8S 311.85 19.34 292.51 MW-9 274.58 14.81 259.77 MW-1D 309.69 20.43 289.26 MW-2D 317.74 15.58 302.16 MW-3D 295.60 7.88 287.72 MW-4D 294.16 9.73 284.43 MW-5D 281.94 5.11 276.83 MW-8D 311.61 18.85 292.76 Note 1: Top of PVC Casing Elevations from Table 1 of the Baseline Sampling Report dated June 2001 by Almes & Associates, Inc., with the exception of MW-9 which was provided by Lawrence Associates in email correspondence dated December 22, 2011. Note 2: Depth to water measurements collected by S&ME on April 26-27, 2017. Groundwater Elevation Summary Table Anson Waste Management Facility Shallow Wells Deep Wells Groundwater Flow Velocity Calculations Anson Waste Management Facility First Semi-Annual 2017 Event Shallow Zone Velocity V = [(k)(i)]/(n) V = [(4.8x10-4 cm/sec)(0.017 ft/ft]/0.11 V = 7.4x10-5 cm/sec V = 0.21 ft/day V = 77 ft/yr Deep Zone Velocity V = [(k)(i)]/(n) V = [(5.2x10-4 cm/sec)(0.012 ft/ft]/0.18 V = 3.5x10-5 cm/sec V = = 9.9 x10-2 ft/day V = 36 ft/yr Hydraulic conductivity and effective porosity values from the following document: Design Hydrogeologic Report, Phase 2 Expansion, Anson Waste Management Facility. Dated February 2008 by ESP Associates, P.A. & David Garrett & Associates. Conversion factor: ft/day = 2,835 x cm/sec. Shallow Zone Gradient (i) is from the average gradient at site using the potentiometric surface map from Point A to Point B. Gradient (i) = Change in Groundwater Elevation along Flow Path i: From Point A (300 contour) to Point B (260 contour) = 40 ft / 2,990 ft = 0.017 ft/ft Deep Zone Gradient (i) is from the average gradient at site using the potentiometric surface map from Point A to Point B. Gradient (i) = Change in Groundwater Elevation along Flow Path i: From Point A (300 contour) to Point B (280 contour) = 20 ft / 1,641 ft = 0.012 ft/ft APPENDIX B STATISTICAL EVALUATIONS ConstituentWellUpper Lim.Lower Lim.DateObserv.Sig.Bg NBg MeanStd. Dev.%NDsND Adj.TransformAlphaMethodBarium Total (mg/L)MW-8S 4n/a4/26/2017 2.52No 34 -0.5707 0.9042 0 Noneln(x) 0.0005852 Param Intra 1 of 2Chromium Total (mg/L)MW-4S 0.059 n/a4/26/2017 0.0106 No 30 -5.14 1.05 10 Noneln(x) 0.0005852 Param Intra 1 of 2Prediction Limit Client: RSI Data: AnsonCounty Printed 5/23/2017, 4:40 PM 01234511/1/002/18/046/6/079/22/101/8/144/26/17MW-8S backgroundMW-8S complianceLimit = 4Prediction LimitIntrawell ParametricConstituent: Barium Total Analysis Run 5/23/2017 4:37 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LBackground Data Summary (based on natural log transformation): Mean=-0.5707, Std. Dev.=0.9042, n=34. Seasonality was not detected with 95% confidence. Normality test: Shapiro Wilk @alpha = 0.01, calculated = 0.9368, critical = 0.908. Kappa = 2.174 (c=15, w=6, 1 of 2, event alpha = 0.05132). Report alpha = 0.0005852. EPA1989 outlier screening was performed on the background data (to establish suspected outliers for Dixon's/Rosner's). No background outliers were found.Within Limit 00.0120.0240.0360.0480.061/24/014/25/047/26/0710/25/101/24/144/26/17MW-4S backgroundMW-4S complianceLimit = 0.059Prediction LimitIntrawell ParametricConstituent: Chromium Total Analysis Run 5/23/2017 4:39 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values.Background Data Summary (based on natural log transformation): Mean=-5.14, Std. Dev.=1.05, n=30, 10% NDs. Seasonality was not detected with 95% confidence. Normality test: Shapiro Wilk @alpha = 0.01, calculated = 0.9394, critical = 0.9. Kappa = 2.203 (c=15, w=6, 1 of 2, event alpha = 0.05132). Report alpha = 0.0005852. EPA1989 outlier screening was performed on the background data (to establish suspected outliers for Dixon's/Rosner's).No background outliers were found.Within Limit TIME SERIES PLOTS 00.0120.0240.0360.0480.0610/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Antimony Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.0160.0320.0480.0640.0810/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Arsenic Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.81.62.43.2410/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Barium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/L 00.010.020.030.040.0510/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Beryllium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.0120.0240.0360.0480.0610/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Cadmium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.10.20.30.40.510/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Chromium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.040.080.120.160.210/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Cobalt Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.40.81.21.6210/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Copper Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.060.120.180.240.310/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Lead Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.140.280.420.560.710/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Nickel Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.0040.0080.0120.0160.0210/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Selenium Total Analysis Run 5/23/2017 4:43 PM LF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.61.21.82.4310/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Silver Total Analysis Run 5/23/2017 4:43 PM LF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.0060.0120.0180.0240.0310/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Thallium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.120.240.360.480.610/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Vanadium Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. 00.160.320.480.640.810/30/002/16/046/5/079/21/101/8/144/27/17MW-2S (bg)MW-3SMW-4SMW-5SMW-8SMW-9Time SeriesConstituent: Zinc Total Analysis Run 5/23/2017 4:43 PMLF Client: RSI Data: AnsonCountySanitas™ v.9.5.31 Software licensed to Jett Environmental Consulting. UGmg/LHollow symbols indicate censored values. APPENDIX C LABORATORY ANALYTICAL REPORTS & FIELD SAMPLING FORMS