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HomeMy WebLinkAbout1901_ChathamCountyClosed_MSWLF_GWMR_20171229DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 November 2017 Groundwater Monitoring Report Chatham County Landfill Pittsboro, North Carolina NC Solid Waste Permit # 19-01 Prepared for: Chatham County Environmental Quality Department PO BOX 1550 Pittsboro, North Carolina 27312 December 2017 Prepared by: © 2017 Smith Gardner, Inc. This document is intended for the sole use of the client for which it was prepared and for the purpose agreed on by the client and Smith Gardner, Inc. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 November 2017 Groundwater Monitoring Report Chatham County Landfill NC Solid Waste Permit #19-01 Prepared For: Chatham County Environmental Quality Department Pittsboro, North Carolina 27312 S+G Project No. CHATHAM 13-2 Wesley Wheless Staff Geologist Madeline German, P.G. Geologist December 2017 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 12/29/2017 12/29/2017 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Table of Contents Page i Chatham County Landfill Solid Waste Permit No. 19-01 November 2017 Groundwater Monitoring Report Table of Contents Page 1.0 INTRODUCTION ................................................................................................................... 1 2.0 SITE GEOLOGY .................................................................................................................... 1 3.0 SAMPLING LOCATIONS ...................................................................................................... 1 4.0 SAMPLING PROCEDURES .................................................................................................. 1 5.0 FIELD & LABORATORY RESULTS ....................................................................................... 2 5.1 Field Results .............................................................................................................. 2 5.2 Laboratory Analysis & Results ................................................................................. 2 5.2.1 Inorganic Constituent Results ...................................................................... 2 5.2.2 Organic Constituent Results ......................................................................... 3 5.2.3 Surface Water Results .................................................................................. 3 6.0 GROUNDWATER CHARACTERIZATION ............................................................................... 3 7.0 CONCLUSIONS .................................................................................................................... 4 FIGURES Figure 1 Potentiometric Contour Map TABLES Table 1 Groundwater Elevation Table 2 Field Parameters Table 3 Detected Inorganic Constituents Table 4 Detected Organic Constituents Table 5 Velocity and Conductivity Calculations APPENDICES Appendix A Monitoring Well Information Appendix B Laboratory Analytical Report DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Page 1 1.0 INTRODUCTION The Chatham County Landfill, located at 811 County Landfill Road in Pittsboro, North Carolina, operating under Solid Waste Permit #19-01, is required to submit semi-annual groundwater monitoring reports in accordance with 15A NCAC 13B.0544. This report presents the results from the sampling event conducted on November 14, 2017. The Chatham County Landfill facility contains a closed MSW landfill, scrap tire area, a yard- waste mulching operation, the notified land clearing and inert debris (LCID) landfill (N0069) and the household hazardous waste (HHW) collection facility (19-04). White goods collections ceased at this facility in 2012. The MSW landfill is an approximately 80 acre unlined facility that ceased operation in 1993 per Solid Waste Regulations and the post closure conditions dated December 20, 1996. This report includes a field procedure summary, summary tables, laboratory analyses and groundwater characterization. 2.0 SITE GEOLOGY According to the 1985 Geologic Map of North Carolina, the Chatham County Landfill is located in Cambrian/Late Proterozoic age Felsic Metavolcanic Rock of the Charlotte Belt; defined as metamorphosed dacite, rhyolitic flows and tuffs, light gray to greenish gray and generally interbedded with mafic and intermediate metavolcanic rock, meta-argillite and metamudstone. The Geology of the Carolinas1 describes the Charlotte Belt as “dominantly plutonic” mafic gneisses, amphibolites, metagabbros and metavolcanic rock. Due to the abundance of post- deformational plutons geologic structure is difficult to determine. Many Cambrian/Late Proterozoic age plutons have a massive interior and only show foliation near their contacts. 3.0 SAMPLING LOCATIONS The groundwater monitoring network consists of five wells (MW-1 through MW-5) positioned around the landfill perimeter (Figure 1). Monitoring wells MW-4 and MW-5 are located upgradient of the landfill. Well depths range from 20 to 65 feet below ground surface (bgs). Two surface water sampling points (SW-1 and SW-2) are located up and downstream of the landfill on Harlands Creek, respectively. Both were dry this event. A trip blank (TB) was also submitted for quality control purposes. Available well records are presented in Appendix A. 4.0 SAMPLING PROCEDURES Sampling procedures followed the protocols set forth in the North Carolina Water Quality Monitoring Guidance Document for Solid Waste Facilities (North Carolina Department of Environmental Quality (NCDEQ), Division of Waste Management (DWM), rev 4-08). Each well 1 Horton, J. Wright, and Zullo, Victor, A., The Geology of the Carolinas, University of Tennessee Press, 1991. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Page 2 was gauged to determine groundwater depth and then purged three to five well volumes or until dry. Water table elevations are included in Table 1. Samples were collected in laboratory prepared containers for the specified analytical procedures. Groundwater samples were properly preserved, placed on ice and transported to the laboratory facility within the specified hold times for analysis. 5.0 FIELD & LABORATORY RESULTS 5.1 Field Results Field parameter measurements for pH, temperature, turbidity and specific conductivity were collected by S+G personnel; data is presented in Table 2. November 2017 data for pH is elevated from past sampling events. Other field parameters are generally consistent with previously recorded site data. 5.2 Laboratory Analysis & Results Samples were transported to Prism Laboratories, Inc., in Charlotte, NC, a North Carolina certified laboratory (NC Certification No.: 402). Laboratory analysis for sampled locations included Appendix I metals and volatile organic compounds (VOCs) via the Solid Waste Section (SWS) approved analytical methods presented in the laboratory report. Analytical results were compared to the NC DWM Solid Waste Section Quantitation Limits (SWSLs), 15A NCAC 2L.0200 (2L Standard), 15A NCAC 2L .0200 (2B Standard), SWS established Groundwater Protection (GWP) Standard and Federal Maximum Contaminant Limits (MCL). Results were reported to established “Method Detection Limits” (MDL). Values reported below the MDL are considered non-detect. Constituents noted as “J” values are defined by the laboratory as “detected but below the Reporting Limit; therefore, result is an estimated concentration”. These “J-values” are non- quantifiable concentrations. The laboratory analytical report is included as Appendix B. 5.2.1 Inorganic Constituent Results One inorganic constituent, chromium, was reported in the sample collected from MW-1 at a concentration above its 2L Standard: Two inorganic constituents were reported in collected samples at concentrations above their SWS GWP Standards: • cobalt (MW-1, MW-2, MW-3 and MW-4); • vanadium (MW-1, MW-2, MW-3, MW-4 and MW-5) DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Page 3 High sample turbidity measured in several wells at the site likely influenced inorganic concentrations this event. Also note that MW-4 and MW-5 are upgradient to the landfill and as such exhibit background conditions. Inorganic detections are summarized in Table 3. 5.2.2 Organic Constituent Results Two organic constituents were detected in collected samples above their 2L Standards: • benzene (MW-2); and • vinyl chloride (MW-4). Organics analysis is consistent with historically reported detections. MW-4 is located upgradient and immediately adjacent to the unlined landfill unit. Samples collected from MW-5, located further upgradient and away from the landfill, did not contain organic constituents above the MDL this event. Organic detections are summarized in Table 4. 5.2.3 Surface Water Results Both surface water points (SW-1 and SW-2) were dry for this sampling event and were not sampled. 6.0 GROUNDWATER CHARACTERIZATION A potentiometric surface map was prepared from groundwater elevations for this sampling event. In general, groundwater is flowing east toward Harlands Creek. This is consistent with groundwater flow patterns previously reported for the site. The potentiometric surface map is attached as Figure 1. Groundwater flow velocities were calculated for monitoring wells MW-1 through MW-5 using the equation: V = Ki/n Where: K = hydraulic conductivity i = groundwater gradient n = porosity Groundwater flow velocities averaged 0.274 (ft/day). Calculated flow velocities are included in Table 5. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Page 4 7.0 CONCLUSIONS Laboratory results indicate that the water quality at the Chatham County Landfill is generally consistent with reported historical detections. Inorganic constituent detections are likely due to naturally occurring conditions in conjunction with high sample turbidity concentrations that influenced analytical results. Flow direction remains consistent with reported historical observations. The facility will continue semi-annual monitoring with the next event scheduled for May 2018. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Chatham County Landfill November 2017 Groundwater Monitoring Report December 2017 Page 5 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 FIGURE November 2017 Groundwater Monitoring Report Chatham County Landfill Solid Waste Permit No. 19-01 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 MW-1 TOC=481.73 DTW=13.11 GWE=468.62 MW-1A MW-2 TOC=465.36 DTW=17.73 GWE=447.63 MW-2A MW-3 TOC=465.85 DTW=13.44 GWE=452.41 MW-4 TOC=522.84 DTW=49.72 GWE=473.12 MW-5 TOC=515.58 DTW=42.00 GWE=473.58 SW-1 SW-2 0 300'600'G:\CAD\Chatham County\Chatham 13-2\sheets\CHATHAM-B0057.dwg - 12/27/2017 1:06 PMDRAWN:APPROVED:PROJECT NO:SCALE:FILENAME:DATE:FIGURE NO.PREPARED BY:PREPARED FOR:SMITH14 N. Boylan Avenue, Raleigh NC 27603NC LIC. NO. F-1370 (ENGINEERING)919.828.0577GARDNER+© 2017 Smith Gardner, Inc.CHATHAM COUNTY LANDFILLGROUNDWATER MONITORING REPORTPOTENTIOMETRIC CONTOUR MAPNOVEMBER 2017C.J.W.M.M.G.AS SHOWN1Dec 2017CHATHAM 17-5CHATHAM-B0057MW-1 TOC= DTW= GWE= DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 TABLES November 2017 Groundwater Monitoring Report Chatham County Landfill Solid Waste Permit No. 19-01 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Table 1 Groundwater Elevation Chatham County Landfill November 14, 2017 By:WWW Date: 12/14/2017 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham\17. November 2017\11-17chatham_gw_tables Well Well Installation Date Latitude Longitude Well Diameter (inches) Total Well Depth (ft btop) Ground Surface Elevation (ft amsl) TOC Elevation (ft amsl) Depth to Water (ft bgs) Groundwater Elevation (ft amsl) Screen Interval (ft bgs) Screen Lithology MW-1 NA 38.94805 83.47075 2.0 25 474 481.73 13.11 468.62 15-25 bedrock MW-2 NA 38.95079 83.47093 2.0 29.5 460 465.36 17.73 447.63 19.5-29.5 bedrock MW-3 4/1/1997 38.95257 83.47327 2.0 22 451 465.85 13.44 452.41 5-20 bedrock MW-4 6/16/1997 38.94507 83.47360 2.0 65 514 522.84 49.72 473.12 47.5-62.5 bedrock MW-5 1/15/2009 38.94440 83.47298 2.0 51 508 515.58 42.00 473.58 37-47 metavolcanic bedrock NOTE:Location coordinates from Engineering & Environmental Science Company 5/11/2009 Methane Monitoring Site Plan drawing 1 Top of Casing elevation from December 11, 2012 Engineering & Environmental Science Company Monitoring Report Groundsurface elevation estimated from topography Water level data measured by Smith Gardner, Inc. personnel MW-1 and MW-2: Well Depth measured by Smith Gardner, Inc personnel, 10 foot screen estimated, screen lithology assumed N/A=Data Not Available DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Table 2 Field Parameters Chatham County Landfill November 14, 2017 By:WWW Date: 12/14/2017 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham\17. November 2017\11-17chatham_gw_tables Well pH (Std Units) Specific Conductivity (umhos/cm) Turbidity (NTU)Temperature (Celsius) MW-1 7.36 100 36 15.9 MW-2 6.98 100 27 15.1 MW-3 7.21 80 238 14.8 MW-4 7.90 120 86 15.2 MW-5 8.46 180 90 14.4 NOTE: Field data measured by Smith Gardner, Inc. personnel. SW-1 and SW-2 were dry this event DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Table 3 Detected Inorganic Constituents Chatham County Landfill November 14, 2017 By: WWW Date: 12/18/2017 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham\17. November 2017\11-17chatham_gw_tables Parameter MDL RL SWSL 2L/GWP*MCL 2B MW-1 MW-2 MW-3 MW-4 MW-5 Antimony 0.19 1 6 1*6 640 <0.19 <0.19 0.24 J <0.19 <0.19 Arsenic 0.031 1 10 10 10 10 0.35 J 3.5 0.83 J 1.7 1.3 Barium 0.97 5 100 700 2000 200000 180 370 35 35 8.1 Beryllium 0.057 1 1 4*4 6.5 0.072 J 0.44 J 0.22 J 0.086 J 0.092 J Cadmium 0.078 1 1 2 5 2 0.27 J 0.39 J 0.17 J 0.29 J 0.17 J Chromium 0.19 1 10 10 100 50 22 1.2 2.4 1.1 1 Cobalt 0.0071 1 10 1*NE 4 4.8 7 1.3 2.6 0.72 J Copper 0.22 5 10 1000 1300 7 8.2 4.8 J 4.7 J 3.8 J 2.5 J Lead 0.093 1 10 15 15 25 1.1 1.1 3.3 1.4 1.5 Nickel 0.85 2 50 100 NE 88 84 1.9 J 1.2 J 3.8 2.9 Selenium 0.63 1 10 20 50 5 <0.63 0.83 J 0.72 J <0.63 <0.63 Silver 0.063 1 10 20 100 0.06 <0.063 <0.063 <0.063 <0.063 0.095 J Vanadium 0.1 1 25 0.3*NE NE 8.5 6.6 4.7 5.7 4.6 Zinc 2.80 10 10 1000 5000 50 27 68 62 28 26 NOTE:MDL -Method Detection Limit RL -Reporting Limit established by Lab SWSL -Solid Waste Section Quantitation Limits 2L -Groundwater Standards (15A NCAC 2L 0200) GWP -Groundwater Protection Standards (noted by *) MCL Federal Maximum Contaminant Limit 2B -15A NCAC 2B.0200 et. seq. Standard for Class C waters BOLD -Detection above 2L or GWP Standard <MDL -Constituent not detected at or above the MDL J -Defined by the laboratory as detected but below the Reporting Limit (RL); therefore, result is an estimated concentration. NE -Standard Not Established Table units are presented in ug/l. Lab analysis by Prism Laboratories, Inc., Work Order #7110335, dated 11/28/2017. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Table 4 Detected Organic Constituents Chatham County Landfill November 14, 2017 By: WWW Date: 12/18/2017 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham\17. November 2017\11-17chatham_gw_tables Parameter MDL RL SWSL 2L 2B MCL MW-1 MW-2 MW-4 1,1-Dichloroethane 0.083 0.50 5 6 100 NE 0.93 <0.083 <0.083 1,4-Dichlorobenzene 0.050 0.50 1 6 100 75 0.96 1.4 1.1 Benzene 0.048 0.50 1 1 51 5 <0.048 3.1 0.75 Chlorobenzene 0.062 0.50 3 50 140 100 <0.065 5.1 1.4 Chloroethane 0.220 0.50 10 3000 NE NE <0.22 <0.22 0.86 Vinyl chloride 0.097 0.50 1 0.03 2.4 2 <0.097 <0.097 0.53 NOTE:MDL -Method Detection Limit RL -Reporting Limit established by LabSWSL-Solid Waste Section Quantitation Limits2L-Groundwater Standards (15A NCAC 2L 0200) 2B -NCAC 2B Standard for Class C waters MCL -Maximum Contaminant LimitBOLD-Detection above 2L Standard J - <MDL -Constituent not detected at or above the MDL Table units are presented in ug/l. Lab analysis by Prism Laboratories, Inc., Work Order #7110335, dated 11/28/2017. Defined by the laboratory as detected but below the DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 Table 5 Velocity and Conductivity Calculation Chatham County Landfill November 14, 2017 By: MG Date: 5/23/2016 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham\17. November 2017\11-17chatham_gw_tables Well Groundwater Elevation (feet) Hydraulic Conductivity (ft/day) Porosity (%)Gradient Velocity (ft/day) MW-1 468.62 7.1 0.45 0.0201 0.317 MW-2 447.63 7.1 0.45 0.0182 0.288 MW-3 452.41 7.1 0.45 0.0402 0.634 MW-4 473.12 7.1 0.45 0.0045 0.070 MW-5 473.58 7.1 0.45 0.0039 0.061 Avg V (ft/day)0.274 NOTE:Velocity Calculated from V=K*i/n V = velocity K = Hydraulic Conductivity i = Gradient n = Porosity Hydraulic conductivity and porosity values assumed from Groundwater and Wells (Driscoll) Gradient measured from Potentiometric Contour Map DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 APPENDIX A Monitoring Well Information November 2017 Groundwater Monitoring Report Chatham County Landfill Solid Waste Permit No. 19-01 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 APPENDIX B Laboratory Analytical Results November 2017 Groundwater Monitoring Reports Chatham County Landfill Solid Waste Permit No. 19-01 DocuSign Envelope ID: F45D7AD1-9300-494F-B343-6132E1F7AD93 This page intentionally left blank. 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