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HomeMy WebLinkAbout5409_LenoirCounty_GWMReport_DIN26154_20150708Lenoir County Subtitle D Lined MSWLF LaGrange, North Carolina July 2015 Permit Number: 54-09 Prepared for Municipal Engineering Services Company, P.A.Garner and Boone , North Carolina MESCO Project Number: G15029.0 Semi-Annual Water Quality Monitoring Report P.O. Box 97 Garner, NC 27529 License No. C-0281 TABLE OF CONTENTS SECTION Introduction Page 1 Background Page 1 Sampling Procedure Page 2 Field Parameter Data Page 2 Laboratory Results Page 2 Quality Control Samples Page 2 Groundwater Samples Page 2 Surfacewater Samples Page 3 Leachate Samples Page 3 Groundwater and Surfacewater Characterization Page 3 Findings Page 3 Closing Page 3 TABLES Groundwater Monitoring Well Construction Table Table 1 Sampling and Analysis Summary Table 2 Detections in Water Samples above SWSL, GWP, 2L, 2B or MCL (Appendix I) Table 3 Detections in Leachate Samples above SWSL, GWP, 2L, 2B or MCL Table 4 Hydrogeologic Properties at Monitoring Well Locations Table 5 FIGURES Topographic Map with Site Location Figure 1 Potentiometric Map of Uppermost Aquifer Figure 2 APPENDICIES Laboratory and Field Analysis Reports and Chains of Custody Appendix A May 31, 2016 Ms. Jaclynne Drummond Solid Waste Section (SWS) NC Department of Environmental Quality (NCDEQ) 2090 US Highway 70 Swannanoa, NC 28778 Re: Semi-Annual Water Quality Monitoring Report Lenoir County Subtitle D Lined Landfill, Phase 1 Permit No. 54-09 MESCO Project No. G15029.0 Event Date(s): July 7-8, 2015 Dear Ms. Drummond: Introduction On behalf of Lenoir County, Municipal Engineering Services Company, P.A. (MESCO) is pleased to present this Semi-Annual Water Quality Report for the summer 2015 event performed at the Lenoir County Subtitle D Lined Municipal Solid Waste Landfill (MSWLF), Phase 1. NCDENR Solid Waste Rules 15A NCAC 13B.1632 requires that Lenoir County provide this report to the SWS on a semi-annual basis. This report documents the quality of the groundwater, surface waters and leachate during this monitoring event performed on July 7-8, 2015. Laboratory analytical results indicate that constituents continue to not be detected in excess of any applicable water quality Standard. Background The Lenoir County Subtitle D lined MSWLF, permit #54-09, is located at 2949 Hodges Farm Road, LaGrange, North Carolina. The site location topographic map is depicted in the attached Figure 1. The lined MSWLF is currently not accepting waste rather being transferred to another out of county MSWLF. Water quality at this facility has been monitored at least semi-annually since prior to operation in 2003 with all historical analytical data available for trend comparison. As specified within 15A NCAC 13B.1632(j), the SWS Environmental Monitoring Report Form and SWS issued memorandums this report contains sampling procedures, field and laboratory results, groundwater and surface water characterization. Well construction summary table, sampling and analysis summary table, detections compared to Standards tables, hydrogeologic properties table, potentiometric map, field parameters, laboratory analytical reports with quality assurance/quality control data and chains-of-custody (C-O-C) are also included in this report. Sampling Procedure Environment 1 (E1) of Greenville, NC reportedly performed this sampling event utilizing portable monitoring methodology in accordance with the approved Sampling & Analysis Plan (SAP) contained in the Lenoir County Landfill, Phase 1 Design Hydrogeologic Study dated August 19, 2002. E1 reportedly collected water samples from four downgradient groundwater monitoring wells (MW-14 through MW-17), two hydraulically upgradient background wells (MW-13 and MW-18), and the the leachate lagoon (LAGOON). Quality control measures instituted during this event included submittal and analysis of an equipment blank (EB), field blank (FB) and trip blank (TB). Additional static water level readings were recorded from eleven supplementary piezometers (P-3A, P1-4, P1-14, P-14, P-17, P-22, P2-4, P2-9, P2-10, MW-19S and MW-19D) to improve potentiometric map coverage. The lone designated surface water sample point SW-3 was reported to be dry. Monitoring locations are shown in Figure 2. A summary detailing the construction of the water monitoring wells is presented on Table 1. Field Parameter Data E1 reported the field parameters (pH, static water levels, specific conductance, temperature and turbidity) in the laboratory analysis report (Appendix A). Laboratory Results Samples collected from monitoring wells contained in the SAP and blanks (EB,FB) were analyzed for the VOC and total metal constituents listed in Appendix I of 40 CFR Part 258. The lined leachate lagoon (LAGOON) samples were tested for the SWS required leachate specific parameters (Appendix I VOCs and metals, nitrate, phosphorus, chemical oxygen demand, biological oxygen demand, pH, and sulfate). A sampling and analysis table summarizing the locations, target parameters and laboratory methods is presented as Table 2. E1 documentation indicates samples were transported under C-O-C protocols and analyzed within the specified hold times for each method. Water samples were analyzed to the laboratory-established Method Detection Limits (MDL), which are at or below the current Solid Waste Section Limits (SWSL). Table 3 summarizes constituents detected in groundwater and surface water samples that attain or were above the current SWSL, Groundwater Protection Standards (GWP), North Carolina Groundwater Standards (2L), the applicable North Carolina Surface Water Standards (2B) for a Class C water-body, and Maximum Contaminant Levels (MCL) also known as “Federal Primary Drinking Water Standards”. Laboratory results and COC are presented in Appendix A. Quality Control Samples Six out of fifteen total metals were detected in low “j-qualified” concentrations in the blanks (EB and FB). Although the field and/or laboratory induced artifact contamination was identified it is unlikely the data set for the lined landfill has been influenced by false positives or high bias. Groundwater Samples Constituents continue to be absent in any groundwater sample in concentrations exceeding the 2L, GWP or MCL Standards. 2 Figures Topographic Map with Site Location Lenoir County Landfill Facility FIGURE 1 QUADRANGLE LEGEND N 2949 Hodges Farm Rd (SR1524) LaGrange, NC 28501 Lat:35-17-07.4269 Long:-77-42-32.7453 Northing:561295.59 Easting:2385220.32 SW-3 UNLINEDC&D MSWLF SUBTITLE DLINEDMSWLF Tables Lenoir County Subtitle D Lined MSWLF Page 1 of 1 Table 1 Groundwater Monitoring Well Construction Table July 7-8, 2015 Latitude Longitude (inches)(ft) MW-13 9/3/03 2 29.4 14.40 15 Silty Sand 107.81 105.79 85.27 22.54 N35° 17' 23.50"W77° 42' 28.56" MW-14 9/3/03 2 21 6 15 Silty Sand 74.81 72.80 62.63 12.18 N35° 17' 28.11"W77° 42' 10.92" MW-15 8/22/01 2 15.13 5.13 10 Silty Sand 71.64 68.69 64.64 7.00 N35° 17' 24.53"W77° 42' 10.28" MW-16 9/2/03 2 21 6 15 Silty Sand 76.36 73.95 69.16 7.20 N35° 17' 21.53"W77° 42' 11.35" MW-17 9/3/03 2 28 13 15 Silty Sand 101.06 99.06 80.81 20.25 N35° 17' 13.30"W77° 42' 22.33" MW-18 4/24/04 2 30.85 15.85 15 Silty Clayey Sand 106.74 103.74 85.27 21.47 N35° 17' 09.44"W77° 42' 27.07" NOTE: Monitoring Well Date Installed Well Diameter Total Well Depth Top of Screen Depth Screen Length Geology of Screened Interval Top of Casing Elevation Ground Elevation Groundwater Elevation Depth to Water (ft bgs)(ft bgs)(ft amsl)(ft amsl)(ft amsl)(ft btoc) bgs = below ground surface amsl= above mean sea level btoc = below top of casing (PVC well casing) Lenoir County Subtitle D Lined MSWLF Page 1 of 1 Table 2 Sampling and Analysis Summary July 7-8, 2015 Field Parameter Leachate Re a s o n N o t S a m p l e d To t a l M e t a l s Me r c u r y , T o t a l St a t i c D e p t h t o W a t e r Te m p e r a t u r e Co n d u c t i v i t y pH Tu r b i d i t y Su l f a t e pH Ph o s p h o r u s BO D , 5 d a y CO D Ni t r a t e La b E P A 8 2 6 0 B L a b E P A 2 0 0 . 8 La b E P A 8 2 6 0 B L a b E P A 2 0 0 . 8 SM 2 5 5 0 B SM 2 5 1 0 B SM 4 5 0 0 H B SM 2 1 3 0 - B SM 4 2 6 C La b S M 4 5 0 0 H B La b E P A 3 6 5 . 4 La b S M 5 2 1 0 B La b H A C H 8 0 0 0 La b E P A 3 5 3 . 2 MW-13 x x x x x x x MW-14 x x x x x x x MW-15 x x x x x x x MW-16 x x x x x x x MW-17 x x x x x x x MW-18 x x x x x x x SW-3 Dry LAGOON x x x x x x x x x x x x EB x x x FB x x TB x P-22 E x MW-19S E x MW-19D E x P1-4 E x P1-14 E x P-3A E x P-17 E x P2-1 E x P2-4 E x P2-9 E x P2-10 E x E = Exempt. Not listed on SAP water level readings only. App. I App II VO C s VO C s App I & II = Lists from current 40 CFR 258 Lenoir County Subtitle D Lined MSWLF Page 1 of 1 Table 3 Detections in Water Samples above SWSL, GWP, 2L, 2B or MCL (Appendix I) July 7, 2015 Sample Date Result Unit MW-15 Barium, Total 7/7/15 116 0.01 100 700 2000 A definitive source of the detection was not determined as part of this report. Preliminary cause only listed pursuant to instructions BOLD = Concentration > 2L, 2B, GWP or MCL Standard Sample ID Parameter Name 1 MDL 2 SWSL 3 2L 4 2B 5 GWP 6 MCL 7 Preliminary Cause 8 ug/l 1 Table contains constituents detected at or above SWSL, GWP, 2L, 2B or MCL 2 MDL = Method Detection Limit 3 SWSL = Solid Waste Section Reporting Limit 4 2L = North Carolina 15A NCAC 2L Groundwater Quality Standard 5 2B = North Carolina 15 NCAC 2B Surface Water Quality Standard for this Specific Stream Classification 6 GWP = Groundwater Protection Standard 7 MCL = Primary Drinking Water Standard (not currently applicable for regulatory comparisons) 8 Preliminary Cause = Refers to a preliminary analysis of the cause and/or source of a detection over the respective 2L/2B Standard. Lenoir County Subtitle D Lined MSWLF Page 1 of 1 Table 4 July 7, 2015 (cm/sec)(%)(ft/yr) MW-13 7.69E-05 23 0.012 4 N56E 22.54 85.27 Silty Sand MW-14 3.38E-03 23 0.022 336 N67E 12.09 62.72 Silty Sand MW-15 2.89E-03 23 0.016 203 N68E 7.00 64.64 Silty Sand MW-16 9.72E-04 23 0.026 113 N73E 7.20 69.16 Silty Sand MW-17 1.13E-03 23 0.014 72 N66E 20.25 80.81 Silty Sand MW-18 1.25E-04 23 0.016 9 N79E 21.47 85.27 Silty Clayey Sand Minimum 7.69E-05 23 0.01 4 -7.00 62.72 - Average 1.43E-03 23 0.02 123 -15.09 74.65 - Maximum 3.38E-03 23 0.03 336 -22.54 85.27 - NOTE:1.Hydraulic conductivity (K) values based on slug test results, performed by MESCO in December 2005. 3.Static water levels recorded by Environment 1, Inc. on July 7, 2015. Linear velocity rate (Q) is defined by modified Darcy's equation: where K = hydraulic conductivity Hydrologic Properties at Monitoring Well Locations Monitoring Well Hydraulic Conductivity Effective Porosity Hydraulic Gradient (ft/ft) Groundwater Velocity Rate Flow Direction Depth To Water Water Table Elevation Screened Interval Lithology(ft btoc)(ft amsl) 2. Effective Porosity (ne) values obtained from the MESCO Ph. 1 design hydrogeologic report completed in August 2002. ne = effective porosity dh = head difference dl = horizontal distance dl dh n KQ e -= Appendix A Laboratory Analysis Report Field Analysis Report Chains of Custody