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HomeMy WebLinkAbout3402_HanesMillMSWLFLined_ASD_DIN27387_20161103 Golder Associates NC, Inc. 5B Oak Branch Drive Greensboro, NC 27407 USA Tel: (336) 852-4903 Fax: (336) 852-4904 www.golder.com Engineering Lic. No. C-2862/Geology Lic. No. C-399 Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation November 3, 2016 Project No. 0939668716 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 (828) 296-4706 RE: 14-DAY NOTIFICATION AND ALTERNATE SOURCE DEMONSTRATION HANES MILL ROAD LANDFILL, PERMIT NO. 34-02 WINSTON-SALEM, NORTH CAROLINA Dear Jackie: On behalf of Winston-Salem/Forsyth County City/County Utilities Commission (CCUC), Golder Associates NC, Inc. (Golder) is submitting this 14-Day Notification as required by North Carolina Solid Waste Management Regulation (NCSWMR) 15A North Carolina Administrative Code (NCAC) 13B .1633(c)(1). The 14-Day Notification of Groundwater Protection Standard Exceedance(s) form is included as Attachment 1. 1.0 14-DAY NOTIFICATION [15A NCAC 13B .1633(C)(1)] Tables 1 though 3 (shown below) summarize the NC Appendix I constituents that were detected at concentrations above their respective Solid Waste Section Reporting Limits (SWSLs) and NC 2L Groundwater Standards or Solid Waste Section Groundwater Protection Standards (GPSs) during the second semiannual water quality monitoring event conducted at the closed unlined landfill, the closed Subtitle D landfill, and the active Subtitle D landfill at the above-referenced facility between September 12 – 14, 2016. The laboratory certificates-of-analyses are included as Attachment 2. It is noted that the Closed Unlined Landfill is in corrective action for volatile organic compounds (VOCs); therefore no notifications for groundwater standard exceedances for VOCs are required for this facility. Table 1: 14-Day Notifications for the Closed Unlined Landfill Constituent: Location: Result (µg/L): SWSL (µg/L): NC2L or GPS (µg/L): Approved ASD: Barium OW-3 993 700 100 No Cobalt OW-3 10.7 10 1 No Note: µg/L = micrograms per liter Ms. Jaclynne Drummond November 3, 2016 NC DEQ, Solid Waste Section 2 Project No. 0939668716 Table 2: 14-Day Notifications for the Closed Subtitle D Landfill Constituent: Location: Result (µg/L): SWSL (µg/L): NC2L or GPS (µg/L): Approved ASD: Arsenic MW-6 13.5 10 10 No Chromium MW-11 14.3 10 10 No Cobalt MW-6 16.5 10 1 No Cobalt MW-7 14.5 10 1 No Table 3: 14-Day Notification for the Active Subtitle D Landfill Constituent: Location: Result (µg/L): SWSL (µg/L): NC2L or GPS (µg/L): Approved ASD: Cobalt MW-19 22.9 10 1 No 2.0 ALTERNATE SOURCE DEMONSTRATION [15A NCAC 13B .1633(C)(3)] As allowed under 15A NCAC 13B .1633(C)(3), the CCUC has prepared an alternate source demonstration (ASD) in reference to the concentrations of inorganic compounds reported in samples from monitoring wells from the closed unlined landfill, the closed Subtitle D landfill, and the active Subtitle D landfill, as shown above. 2.1 Statistical Analysis The Summary of Statistical Analysis (Attachment 3) summarizes the statistical methods and results used to determine an appropriate background concentration for inorganic compounds detected at concentrations above the SWSLs and NC 2L Standards or GPS in samples from downgradient monitoring wells at the closed unlined landfill, closed Subtitle D landfill, and active Subtitle D landfill during the September 2016 event. The statistical analyses were completed using WQStat software in accordance with 40 CFR 258 and Title 15A NCAC 13B .1632(f) through (h). The statistical summary sheets generated during the statistical analysis are included as Attachment 3. 2.1.1 Closed Unlined Landfill Historical analytical data for barium and cobalt from upgradient well MW-1RR were used to perform inter-well statistics for the closed unlined landfill. These data were used to establish background concentrations for barium and cobalt at the closed unlined landfill. The inter-well background statistical limit for each inorganic constituent was based on the non-parametric prediction limit as allowed under Title 15A NCAC 13B .1632 (g)(3). The barium and cobalt concentrations in the sample from OW-3 were below the background concentrations calculated by inter-well statistical methods. This indicates that the barium and cobalt concentrations in samples from downgradient well OW-3 are likely naturally occurring and have been verified with site field data using historical data collected at the facility. 2.1.2 Closed Subtitle D Landfill Historical analytical data for arsenic, chromium, and cobalt from upgradient well MW-1RR were used to perform inter-well statistics for the closed Subtitle D landfill. These data were used to establish background concentrations for arsenic, chromium, and cobalt at the closed Subtitle D landfill. The inter-well background statistical limit for each inorganic constituent was based on the non-parametric prediction limit as allowed under Title 15A NCAC 13B .1632 (g)(3). The chromium and cobalt concentrations in downgradient monitoring wells were below the background concentrations calculated by inter-well statistical methods for the closed Subtitle D landfill. The background concentration calculated using inter-well statistical methods for arsenic was below the concentration reported for MW-6 during the September 2016 event. Therefore, intra-well statistical methods were utilized to calculate statistical background for arsenic at MW-6. The Ms. Jaclynne Drummond November 3, 2016 NC DEQ, Solid Waste Section 3 Project No. 0939668716 intra-well background statistical limit for arsenic in MW-6 was based on the non-parametric prediction limit as allowed under Title 15A NCAC 13B .1632 (g)(3) and the September 2016 arsenic concentration at MW-6 is below the statistically determined background value. These data indicate that the concentrations of arsenic, chromium, and cobalt are likely naturally occurring and have been verified with site field data using historical data collected at the facility. 2.1.3 Active Subtitle D Landfill Historical analytical data for cobalt from upgradient well MW-12 were used to perform inter-well statistics for the active Subtitle D landfill. These data were used to establish background concentrations for cobalt at the active Subtitle D landfill. The inter-well background statistical limit for cobalt was based on the non- parametric prediction limit as allowed under Title 15A NCAC 13B .1632 (g)(3). The background concentration calculated by inter-well statistical methods for cobalt was below the concentration reported for MW-19 during the September 2016 event. Therefore, intra-well statistical methods were utilized to calculate statistical background concentration for cobalt at MW-19. The intra-well background statistical limit for cobalt in MW-19 is based on the upper tolerance prediction limit as allowed under Title 15A NCAC 13B .1632 (g)(3) and the September 2016 cobalt concentration at MW-19 is below statistically determined background value. This indicates that the cobalt concentration at MW-19 is likely naturally occurring and has been verified with site field data using historical data collected at the facility. 2.2 Literature Review of Inorganic Concentrations In addition to the statistical analysis, a desktop study was performed to determine the prevalence of arsenic, barium, chromium, and cobalt in soil and sediment in the general proximity of the Hanes Mill Road Landfill. Twelve sediment samples collected within 20 miles of the Hanes Mill Road Landfill were present in the United States Geological Survey (USGS) National Geochemical Survey Database (as presented in Attachment 4). As shown, arsenic concentrations range from non-detect to 12 parts-per-million (ppm) and barium concentrations range from 65 ppm to 2630 ppm. Chromium concentrations range from 3 ppm to 79 ppm and cobalt concentrations range from non-detect to 36 ppm. While a direct comparison between sediment sample concentrations and groundwater concentrations cannot be made, these data show that the aforementioned inorganic constituents do occur naturally in stream sediment. Therefore, are likely to occur in subsurface soil at the Hanes Mill Road Landfill at concentrations that would account for the concentrations of these constituents in groundwater. 3.0 CLOSING The concentrations of barium and cobalt in the sample from OW-3 at the closed unlined landfill; arsenic in the sample from MW-6, chromium in the sample from MW-11, and cobalt in the samples from MW-6 and MW-7 at the closed Subtitle D landfill; and cobalt in the sample from MW-19 at the active Subtitle D landfill are below the statistically calculated background values and therefore, the concentrations are considered to represent “natural variations in groundwater quality” and appear to be naturally occurring. Further, the stream sediment concentrations of arsenic, barium, chromium, and cobalt presented in the USGS National Geochemical Database were reported at concentrations much higher than the concentrations observed in groundwater samples. Therefore, the available data supports that the arsenic, barium, chromium, and cobalt concentrations reported in groundwater samples from the Hanes Mill Road Landfill are naturally occurring and no further action is warranted. Data are generally consistent with historical data. Unless otherwise directed by NC DEQ, the CCUC will continue monitoring the uppermost aquifer beneath the closed unlined landfill in accordance with the requirements of the Assessment Monitoring Program as outlined in Title 15A NCAC 13B .1634 and will continue monitoring the uppermost aquifer beneath the closed and active Subtitle D landfills in accordance with the requirements of the Detection Monitoring Program as outlined in Title 15A NCAC 13B .1633. A complete semi-annual report will be submitted under separate cover. The next compliance monitoring event for this facility is tentatively scheduled for March 2017. If you have any questions, please contact the undersigned at 336-852-4903. ATTACHMENT 1 14-Day Notification of Groundwater Protection Standard Exceedance Form ATTACHMENT 2 Laboratory Certificates-of-Analyses Closed Unlined Landfill Page 1 of 53 Page 2 of 53 Page 3 of 53 Page 4 of 53 Page 5 of 53 Page 6 of 53 Page 7 of 53 Page 8 of 53 Page 9 of 53 Page 10 of 53 Page 11 of 53 Page 12 of 53 Page 13 of 53 Page 14 of 53 Page 15 of 53 Page 16 of 53 Page 17 of 53 Page 18 of 53 Page 19 of 53 Page 20 of 53 Page 21 of 53 Page 22 of 53 Page 23 of 53 Page 24 of 53 Page 25 of 53 Page 26 of 53 Page 27 of 53 Page 28 of 53 Page 29 of 53 Page 30 of 53 Page 31 of 53 Page 32 of 53 Page 33 of 53 Page 34 of 53 Page 35 of 53 Page 36 of 53 Page 37 of 53 Page 38 of 53 Page 39 of 53 Page 40 of 53 Page 41 of 53 Page 42 of 53 Page 43 of 53 Page 44 of 53 Page 45 of 53 Page 46 of 53 Page 47 of 53 Page 48 of 53 Page 49 of 53 Page 50 of 53 Page 51 of 53 Page 52 of 53 Page 53 of 53 Page 1 of 1 GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 1 of 3 Project Name: Hanes Mill Landfill – Closed Unlined Project Reference Number: 0939-668716.100 Sampling Event Date: September 14-15, 2016 Review Date: October 28, 2016 Initials: TM Report #: CZ13503, CZ13504, CZ13502 Person(s) performing the review are to initial each item on this form as acknowledgement of data acceptance, or as acknowledgement of a review issue. In the case of the latter, a brief explanation should follow the applicable item. Golder Associates Inc. has reviewed the laboratory certificates of analysis, chain-of-custody form, and laboratory provided sample group quality assurance and quality control data for the above referenced sample group to identify potential bias or inaccuracy, in general accordance with the following United States Environmental Protection Agency documents: • Region III Modifications to Functional Guidelines for Organic Data Review Multi-Media, Multi-Concentration, September 1994; • Region III Modifications to the Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, April 1993; and • Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, July 1998. COMPLIANCE ANALYTE LIST(S) (check all that apply) NC Closed Facility/C & D List NC Appendix I NC Appendix I + Detects X NC Appendix II NC Subtitle D Leachate List Other: MW-1RR: App II + methane, ethane, ethane and MNA parameters 1.0 CHAIN OF CUSTODY (COC) REVIEW TM COC was properly signed by all parties. TM Correct project name and number are on the form. TM Sample receipt condition at laboratory was acceptable. TM Each sample and blank submitted for analysis appears in the report. 2.0 SAMPLE HOLDING TIMES TM Holding times for extraction and/or analysis were met for each analytical Method (see below for reference). GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 2 of 3 Review Criteria Method Analytes Holding Time SW-846 Method 8260 and 8011 VOCs 14 days SW-846 Methods 8270, 8080, 8081, 8082, and 8151 SVOCs, PCBs, pesticides and herbicides 7 days for extraction, 40 days from extraction for analysis SW-846 Methods 6000 and 7000 Series Metals except mercury 6 months (no temperature requirements) SW-846 Method 7470 Mercury 28 days SW-846 Method 376.1 Sulfide 7 days SW-846 Method 9010 Cyanide 14 days EPA Method 300 Nitrate/Sulfate 48 hours/28 days EPA Method 405.1 BOD 48 hours EPA Method 410.4 COD 28 days EPA Method 365.4 Phosphorous 28 days 3.0 LABORATORY QUALITY CONTROL REVIEW TM Laboratory analyzed at least one internal blank for each method, where applicable. TM Laboratory blank is interference-free.  Lab Blank o Barium @ 1.08 ug/L (J) TM Surrogate recoveries are provided for each analytical method, where applicable. TM Surrogate recoveries for each method are within the acceptable limits (i.e., at least 50% of the surrogates were within range). TM MS/MSD/LCS data results are provided for each analytical method. TM MS/MSD/LCS recoveries for each method are within the acceptable limits (i.e., at least 1 of the 3 were within range).  The spike recovery of Trichloroethene was outside of control limits for the 8260B MS and MSD samples. The QC batch was approved on acceptable LCS recovery of this analyte. 4.0 ANALYTE LISTS/METHODS TM The proper number of constituents are present for each analyte list as identified above (including detects where applicable). TM Proper EPA SW-846 analytical methods were used for analysis. 5.0 DATA REPORTING TM All analytical reporting associated with the event was performed by the contracted lab. TM Trip, field and/or equipment, and laboratory blank results have all been reported. All detects for blanks are listed below by constituent. All laboratory method blanks, if GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 3 of 3 any, have been ‘flagged’ with a ‘B’ where detected in other samples as appropriate and a laboratory narrative was provided. If the sample was flagged by the laboratory and is not within 5X of the concentration in the blank (or 10X for commonly detected laboratory contaminants-acetone, methylene chloride and phthalates), list below with explanation if flags should be removed. If flags need to be added for samples, also list below.  Lab Blank o Barium @ 1.08 ug/L (J)  Field Blank o Copper @ 3.72 ug/L (J)  B-flags o Copper: MW-1RR @ 2.41 ug/L (J), Barium: OW-13D @ 4.60 ug/L (J) TM It is clear from the laboratory report that samples have or have not been diluted during analysis, and if the samples have been diluted, the result is reported as a multiple of the dilution (e.g., a sample diluted 10x resulting in an analytical detection of 1.0 should be reported as 10). Those that have been diluted are listed below with the dilution factor. TM The report provides the reporting limit for each constituent. TM The results were reported at or below their proper reporting limits (e.g., NC Solid Waste Section Reporting Limits-SWSLs). Those that are not reported correctly are listed below (by constituent) with the proper reporting limit listed beside them. State if the reporting limit error is due to dilutions. TM No inorganic or organic constituents were reported above their respective NC 2L Drinking Water Standards or Groundwater Protection Standards (GPS) in wells or field/equipment/trip blanks or above applicable Surface Water Standards for surface water points.  Vanadium (SWS GWPS = 0.3 ug/L) o OW-7DA @ 6.94 ug/L (J) o OW-11 @ 1.73 ug/L (J) o MW-1RR @ 1.72 ug/L (J) N/A No quantifiable inorganic or organic constituents were detected in a well or surface water point at concentrations outside of their historical range (more than 5X previous concentrations or first-time detections). N/A Other report issues/Communications with laboratory/etc.: Page 1 of 67 Page 2 of 67 Page 3 of 67 Page 4 of 67 Page 5 of 67 Page 6 of 67 Page 7 of 67 Page 8 of 67 Page 9 of 67 Page 10 of 67 Page 11 of 67 Page 12 of 67 Page 13 of 67 Page 14 of 67 Page 15 of 67 Page 16 of 67 Page 17 of 67 Page 18 of 67 Page 19 of 67 Page 20 of 67 Page 21 of 67 Page 22 of 67 Page 23 of 67 Page 24 of 67 Page 25 of 67 Page 26 of 67 Page 27 of 67 Page 28 of 67 Page 29 of 67 Page 30 of 67 Page 31 of 67 Page 32 of 67 Page 33 of 67 Page 34 of 67 Page 35 of 67 Page 36 of 67 Page 37 of 67 Page 38 of 67 Page 39 of 67 Page 40 of 67 Page 41 of 67 Page 42 of 67 Page 43 of 67 Page 44 of 67 Page 45 of 67 Page 46 of 67 Page 47 of 67 Page 48 of 67 Page 49 of 67 Page 50 of 67 Page 51 of 67 Page 52 of 67 Page 53 of 67 Page 54 of 67 Page 55 of 67 Page 56 of 67 Page 57 of 67 Page 58 of 67 Page 59 of 67 Page 60 of 67 Page 61 of 67 Page 62 of 67 Page 63 of 67 Page 64 of 67 Page 65 of 67 Page 66 of 67 Page 67 of 67 Page 1 of 1 GOLDER ASSOCIATES NC, INC. QUALITY ASSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 1 of 4 Project Name: Hanes Mill Landfill – Closed Unlined MNA Project Reference Number: 0939-668716.100 Sampling Event Date: September 14, 2016 Review Date: October 28, 2016 Initials: TM Report #: CZ13504, CZ13502 Person(s) performing the review are to initial each item on this form as acknowledgement of data acceptance, or as acknowledgement of a review issue. In the case of the latter, a brief explanation should follow the applicable item. Golder Associates Inc. has reviewed the laboratory certificates of analysis, chain-of-custody form, and laboratory provided sample group quality assurance and quality control data for the above referenced sample group to identify potential bias or inaccuracy, in general accordance with the following United States Environmental Protection Agency documents: • Region III Modifications to Functional Guidelines for Organic Data Review Multi-Media, Multi-Concentration, September 1994; • Region III Modifications to the Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, April 1993; and • Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, July 1998. COMPLIANCE ANALYTE LIST(S) (check all that apply) NC Closed Facility/C & D List NC Appendix I NC Appendix I + Detects X NC Appendix II NC Subtitle D Leachate List Other: Methane, Ethane, Ethene, Chloride, Mercury, Nitrate, Nitrite, Sulfate, & TOC 1.0 CHAIN OF CUSTODY (COC) REVIEW TM COC was properly signed by all parties. TM Correct project name and number are on the form. TM Sample receipt condition at laboratory was acceptable. TM Each sample and blank submitted for analysis appears in the report. 2.0 SAMPLE HOLDING TIMES TM Holding times for extraction and/or analysis were met for each analytical Method (see below for reference). GOLDER ASSOCIATES NC, INC. QUALITY ASSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 2 of 4 Review Criteria Method Analytes Holding Time SW-846 Method 8260 and 8011 VOCs 14 days SW-846 Methods 8270, 8080, 8081, 8082, and 8151 SVOCs, PCBs, pesticides and herbicides 7 days for extraction, 40 days from extraction for analysis SW-846 Methods 6000 and 7000 Series Metals except mercury 6 months (no temperature requirements) SW-846 Method 7470 Mercury 28 days SW-846 Method 376.1 Sulfide 7 days SW-846 Method 9010 Cyanide 14 days EPA Method 300 Nitrate/Sulfate 48 hours/28 days EPA Method 405.1 BOD 48 hours EPA Method 410.4 COD 28 days EPA Method 365.4 Phosphorous 28 days 3.0 LABORATORY QUALITY CONTROL REVIEW TM Laboratory analyzed at least one internal blank for each method, where applicable. TM Laboratory blank is interference-free.  Barium @ 1.08 ug/L (J) TM Surrogate recoveries are provided for each analytical method, where applicable. TM Surrogate recoveries for each method are within the acceptable limits (i.e., at least 50% of the surrogates were within range).  The 8260B surrogate spike recovery of Dibromofluoromethane exceeded acceptance criteria for the Trip Blank. The sample was approved based on acceptable recovery of the other surrogate standards. TM MS/MSD/LCS data results are provided for each analytical method. TM MS/MSD/LCS recoveries for each method are within the acceptable limits (i.e., at least 1 of the 3 were within range).  The spike recoveries of Alkalinity, Nitrate/Nitrite (NOx), and Sulfide were outside of control limits for the MS and/or MSD samples, and precision between duplicate spikes of NOx exceeded acceptance criteria. The QC batches were approved based on acceptable LCS recovery of these analytes.  The spike recovery of Trichloroethene was outside of control limits for the 8260B MS and MSD samples. The QC batch was approved based on acceptable LCS recovery of this analyte. 4.0 ANALYTE LISTS/METHODS TM The proper number of constituents are present for each analyte list as identified above (including detects where applicable). GOLDER ASSOCIATES NC, INC. QUALITY ASSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 3 of 4 TM Proper EPA SW-846 analytical methods were used for analysis. 5.0 DATA REPORTING TM All analytical reporting associated with the event was performed by the contracted lab. TM Trip, field and/or equipment, and laboratory blank results have all been reported. All detects for blanks are listed below by constituent. All laboratory method blanks, if any, have been ‘flagged’ with a ‘B’ where detected in other samples as appropriate and a laboratory narrative was provided. If the sample was flagged by the laboratory and is not within 5X of the concentration in the blank (or 10X for commonly detected laboratory contaminants-acetone, methylene chloride and phthalates), list below with explanation if flags should be removed. If flags need to be added for samples, also list below.  Lab Blank o Barium @ 1.08 ug/L (J)  Field Blank o Copper @ 3.72 ug/L (J)  B-flags (Copper) o OW3 @ 2.19 ug/L (J), OW10D @ 1.67 ug/L (J), OW12 @ 1.65 ug/L (J) TM It is clear from the laboratory report that samples have or have not been diluted during analysis, and if the samples have been diluted, the result is reported as a multiple of the dilution (e.g., a sample diluted 10x resulting in an analytical detection of 1.0 should be reported as 10). Those that have been diluted are listed below with the dilution factor.  Chloride (x3) o OW-3 TM The report provides the reporting limit for each constituent. TM The results were reported at or below their proper reporting limits (e.g., NC Solid Waste Section Reporting Limits-SWSLs). Those that are not reported correctly are listed below (by constituent) with the proper reporting limit listed beside them. State if the reporting limit error is due to dilutions. TM No inorganic or organic constituents were reported above their respective NC 2L Drinking Water Standards or Groundwater Protection Standards (GPS) in wells or field/equipment/trip blanks or above applicable Surface Water Standards for surface water points.  Barium (NC 2L = 700 ug/L) o OW-3 @ 993 ug/L  Cobalt (GWPS = 1 ug/L) o OW-3 @ 10.7 ug/L o OW-4 @ 2.24 ug/L (J) GOLDER ASSOCIATES NC, INC. QUALITY ASSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 4 of 4  Vanadium (GWPS = 0.3 ug/L) o OW-10D @ 0.50 ug/L (J) o OW-12 @ 1.63 ug/L (J) o OW-14D @ 3.57 ug/L (J)  Benzene (NC 2L = 1 ug/L) (EPA MCL = 5 ug/L) o OW-3 @ 4.8 ug/L o OW-4 @ 1.1 ug/L  1,1-Dichloroethane (NC 2L = 6 ug/L) o OW-10D @ 11 ug/L  1,2-Dichloroethane (NC 2L = 0.4 ug/L) o OW-3 @ 0.64 ug/L  1,2-Dichloropropane (NC 2L = 0.6 ug/L) o OW-3 @ 1.4 ug/L  1,4-Dichlorobenzene (NC 2L = 6 ug/L) o OW-3 @ 28 ug/L o OW-4 @ 6.7 ug/L  Cis-1,2 Dichloroethene (NC 2L = 70 ug/L) (EPA MCL = 70 ug/L) o OW-3 @ 82 ug/L  Tetrachloroethene (NC 2L = 0.7 ug/L) (EPA MCL = 5 ug/L) o OW-4 @ 4.7 ug/L o OW-10D @ 4.7 ug/L  Trichloroethene (NC 2L = 3 ug/L) (EPA MCL = 5 ug/L) o OW-4 @ 6.9 ug/L o OW-10D @ 4.7 ug/L o OW-17D @ 10 ug/L  Vinyl chloride (NC 2L = 0.03 ug/L) (EPA MCL = 2 ug/L) o OW-3 @ 62 ug/L o OW-4 @ 0.87 ug/L (J) o OW-10D @ 0.50 ug/L (J) N/A No quantifiable inorganic or organic constituents were detected in a well or surface water point at concentrations outside of their historical range (more than 5X previous concentrations or first-time detections). N/A Other report issues/Communications with laboratory/etc.: Unlined Subtitle D Landfill Page 1 of 34 Page 2 of 34 Page 3 of 34 Page 4 of 34 Page 5 of 34 Page 6 of 34 Page 7 of 34 Page 8 of 34 Page 9 of 34 Page 10 of 34 Page 11 of 34 Page 12 of 34 Page 13 of 34 Page 14 of 34 Page 15 of 34 Page 16 of 34 Page 17 of 34 Page 18 of 34 Page 19 of 34 Page 20 of 34 Page 21 of 34 Page 22 of 34 Page 23 of 34 Page 24 of 34 Page 25 of 34 Page 26 of 34 Page 27 of 34 Page 28 of 34 Page 29 of 34 Page 30 of 34 Page 31 of 34 Page 32 of 34 Page 33 of 34 Page 34 of 34 Page 1 of 1 GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 1 of 4 Project Name: Hanes Mill Landfill – Closed Sub D Project Reference Number: 0939-668716.101 Sampling Event Date: September 13, 2016 Review Date: October 28, 2016 Initials: TM Report #: CZ13452, CZ13502 Person(s) performing the review are to initial each item on this form as acknowledgement of data acceptance, or as acknowledgement of a review issue. In the case of the latter, a brief explanation should follow the applicable item. Golder Associates Inc. has reviewed the laboratory certificates of analysis, chain-of-custody form, and laboratory provided sample group quality assurance and quality control data for the above referenced sample group to identify potential bias or inaccuracy, in general accordance with the following United States Environmental Protection Agency documents: • Region III Modifications to Functional Guidelines for Organic Data Review Multi-Media, Multi-Concentration, September 1994; • Region III Modifications to the Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, April 1993; and • Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, July 1998. COMPLIANCE ANALYTE LIST(S) (check all that apply) NC Closed Facility/C & D List X NC Appendix I NC Appendix I + Detects NC Appendix II NC Subtitle D Leachate List Other: 1.0 CHAIN OF CUSTODY (COC) REVIEW TM COC was properly signed by all parties. TM Correct project name and number are on the form. TM Sample receipt condition at laboratory was acceptable. TM Each sample and blank submitted for analysis appears in the report. Notes: GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 2 of 4 2.0 SAMPLE HOLDING TIMES TM Holding times for extraction and/or analysis were met for each analytical method (see below for reference). Review Criteria Method Analytes Holding Time SW-846 Method 8260 and 8011 VOCs 14 days SW-846 Methods 8270, 8080, 8081, 8082, and 8151 SVOCs, PCBs, pesticides and herbicides 7 days for extraction, 40 days from extraction for analysis SW-846 Methods 6000 and 7000 Series Metals except mercury 6 months (no temperature requirements) SW-846 Method 7470 Mercury 28 days SW-846 Method 376.1 Sulfide 7 days SW-846 Method 9010 Cyanide 14 days EPA Method 300 Nitrate/Sulfate 48 hours/28 days EPA Method 405.1 BOD 48 hours EPA Method 410.4 COD 28 days EPA Method 365.4 Phosphorous 28 days 3.0 LABORATORY QUALITY CONTROL REVIEW TM Laboratory analyzed at least one internal blank for each method, where applicable. TM Laboratory blank is interference-free.  Lab Blank o Barium @ 1.08 ug/L (J) TM Surrogate recoveries are provided for each analytical method, where applicable. TM Surrogate recoveries for each method are within the acceptable limits (i.e., at least 50% of the surrogates were within range). TM MS/MSD/LCS data results are provided for each analytical method. TM MS/MSD/LCS recoveries for each method are within the acceptable limits (i.e., at least 1 of the 3 were within range). 4.0 ANALYTE LISTS/METHODS TM The proper number of constituents are present for each analyte list as identified above (including detects where applicable). TM Proper EPA SW-846 analytical methods were used for analysis. 5.0 DATA REPORTING TM All analytical reporting associated with the event was performed by the contracted lab. GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 3 of 4 TM Trip, field and/or equipment and laboratory blank results have all been reported. All detects for blanks are listed below by constituent. All laboratory method blanks, if any, have been ‘flagged’ with a ‘B’ where detected in other samples as appropriate and a laboratory narrative was provided. If the sample was flagged by the laboratory and is not within 5X of the concentration in the blank (or 10X for commonly detected laboratory contaminants-acetone, methylene chloride and phthalates), list below with explanation if flags should be removed. If flags need to be added for samples, also list below.  Lab Blank o Barium @ 1.08 ug/L (J)  Field Blank o Copper @ 3.72 ug/L (J)  B-flags o Copper: MW-6, MW-7, MW-8, MW-9, MW-11 TM It is clear from the laboratory report that samples have or have not been diluted during analysis, and if the samples have been diluted, the result is reported as a multiple of the dilution (e.g., a sample diluted 10x resulting in an analytical detection of 1.0 should be reported as 10). Those that have been diluted are listed below with the dilution factor. TM The report provides the reporting limit for each constituent. TM The results were reported at or below their proper reporting limits (e.g., NC Solid Waste Section Reporting Limits-SWSLs). Those that are not reported correctly are listed below (by constituent) with the proper reporting limit listed beside them. State if the reporting limit error is due to dilutions. TM No inorganic or organic constituents were reported above their respective NC 2L Drinking Water Standards or Groundwater Protection Standards (GPS) in wells or field/equipment/trip blanks or above applicable Surface Water Standards for surface water points.  Arsenic (GWPS = 10 ug/L) o MW-6 @ 13.5 ug/L  Chromium (NC 2L = 10 ug/L) o MW-11 @ 14.3 ug/L  Cobalt (GWPS = 1 ug/L) o MW-6 @ 16.5 ug/L o MW-7 @ 14.5 ug/L  Vanadium (GWPS = 0.3 ug/L) o MW-6D @ 1.86 ug/L (J) o MW-8 @ 2.0 ug/L (J) N/A No quantifiable inorganic or organic constituents were detected in a well or surface water point at concentrations outside of their historical range (more than 5X previous concentrations or first-time detections). GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 4 of 4 N/A Other report issues/Communications with laboratory/etc. Active Subtitle D Landfill Page 1 of 65 Page 2 of 65 Page 3 of 65 Page 4 of 65 Page 5 of 65 Page 6 of 65 Page 7 of 65 Page 8 of 65 Page 9 of 65 Page 10 of 65 Page 11 of 65 Page 12 of 65 Page 13 of 65 Page 14 of 65 Page 15 of 65 Page 16 of 65 Page 17 of 65 Page 18 of 65 Page 19 of 65 Page 20 of 65 Page 21 of 65 Page 22 of 65 Page 23 of 65 Page 24 of 65 Page 25 of 65 Page 26 of 65 Page 27 of 65 Page 28 of 65 Page 29 of 65 Page 30 of 65 Page 31 of 65 Page 32 of 65 Page 33 of 65 Page 34 of 65 Page 35 of 65 Page 36 of 65 Page 37 of 65 Page 38 of 65 Page 39 of 65 Page 40 of 65 Page 41 of 65 Page 42 of 65 Page 43 of 65 Page 44 of 65 Page 45 of 65 Page 46 of 65 Page 47 of 65 Page 48 of 65 Page 49 of 65 Page 50 of 65 Page 51 of 65 Page 52 of 65 Page 53 of 65 Page 54 of 65 Page 55 of 65 Page 56 of 65 Page 57 of 65 Page 58 of 65 Page 59 of 65 Page 60 of 65 Page 61 of 65 Page 62 of 65 Page 63 of 65 Page 64 of 65 Page 65 of 65 Page 1 of 1 GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 1 of 3 Project Name: Hanes Mill Landfill – Active Sub D Project Reference Number: 0939-668716.102 Sampling Event Date: September 13, 2016 Review Date: October 28, 2016 Initials: TM Report #: CZ13451, CZ13502 Person(s) performing the review are to initial each item on this form as acknowledgement of data acceptance, or as acknowledgement of a review issue. In the case of the latter, a brief explanation should follow the applicable item. Golder Associates Inc. has reviewed the laboratory certificates of analysis, chain-of-custody form, and laboratory provided sample group quality assurance and quality control data for the above referenced sample group to identify potential bias or inaccuracy, in general accordance with the following United States Environmental Protection Agency documents: • Region III Modifications to Functional Guidelines for Organic Data Review Multi-Media, Multi-Concentration, September 1994; • Region III Modifications to the Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, April 1993; and • Laboratory Data Validation Functional Guidelines for Evaluating Inorganic Analyses, July 1998. COMPLIANCE ANALYTE LIST(S) (check all that apply) NC Closed Facility/C & D List X NC Appendix I NC Appendix I + Detects NC Appendix II NC Subtitle D Leachate List Other: 1.0 CHAIN OF CUSTODY (COC) REVIEW TM COC was properly signed by all parties. TM Correct project name and number are on the form. TM Sample receipt condition at laboratory was acceptable. TM Each sample and blank submitted for analysis appears in the report. Notes: GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 2 of 3 2.0 SAMPLE HOLDING TIMES TM Holding times for extraction and/or analysis were met for each analytical Method (see below for reference). Review Criteria Method Analytes Holding Time SW-846 Method 8260 and 8011 VOCs 14 days SW-846 Methods 8270, 8080, 8081, 8082, and 8151 SVOCs, PCBs, pesticides and herbicides 7 days for extraction, 40 days from extraction for analysis SW-846 Methods 6000 and 7000 Series Metals except mercury 6 months (no temperature requirements) SW-846 Method 7470 Mercury 28 days SW-846 Method 376.1 Sulfide 7 days SW-846 Method 9010 Cyanide 14 days EPA Method 300 Nitrate/Sulfate 48 hours/28 days EPA Method 405.1 BOD 48 hours EPA Method 410.4 COD 28 days EPA Method 365.4 Phosphorous 28 days 3.0 LABORATORY QUALITY CONTROL REVIEW TM Laboratory analyzed at least one internal blank for each method, where applicable. TM Laboratory blank is interference-free TM Surrogate recoveries are provided for each analytical method, where applicable. TM Surrogate recoveries for each method are within the acceptable limits (i.e., at least 50% of the surrogates were within range). TM MS/MSD/LCS data results are provided for each analytical method. TM MS/MSD/LCS recoveries for each method are within the acceptable limits (i.e., at least 1 of the 3 were within range).  The spike recoveries of 1,1- Dichloroethene and Trichloroethene were outside of control limits for the 8260B MS and/or MSD samples. The QC batch was approved based on acceptable recovery of these analytes. 4.0 ANALYTE LISTS/METHODS TM The proper number of constituents are present for each analyte list as identified above (including detects where applicable). TM Proper EPA SW-846 analytical methods were used for analysis. 5.0 DATA REPORTING TM All analytical reporting associated with the event was performed by the contracted lab. GOLDER TMSOCIATES NC, INC. QUALITY TMSURANCE & QUALITY CONTROL LABORATORY DATA REVIEW Page 3 of 3 TM Trip, field and/or equipment, and laboratory blank results have all been reported. All detects for blanks are listed below by constituent. All laboratory method blanks, if any, have been ‘flagged’ with a ‘B’ where detected in other samples as appropriate and a laboratory narrative was provided. If the sample was flagged by the laboratory and is not within 5X of the concentration in the blank (or 10X for commonly detected laboratory contaminants-acetone, methylene chloride and phthalates), list below with explanation if flags should be removed. If flags need to be added for samples, also list below.  Field Blank o Copper @ 3.72 ug/L (J)  B-flags o Copper: MW-15, MW-16, MW-18, MW-19, MW-21 TM It is clear from the laboratory report that samples have or have not been diluted during analysis, and if the samples have been diluted, the result is reported as a multiple of the dilution (e.g., a sample diluted 10x resulting in an analytical detection of 1.0 should be reported as 10). Those that have been diluted are listed below with the dilution factor. TM The report provides the reporting limit for each constituent. TM The results were reported at or below their proper reporting limits (e.g., NC Solid Waste Section Reporting Limits-SWSLs). Those that are not reported correctly are listed below (by constituent) with the proper reporting limit listed beside them. State if the reporting limit error is due to dilutions. TM No inorganic or organic constituents were reported above their respective NC 2L Drinking Water Standards or Groundwater Protection Standards (GPS) in wells or field/equipment/trip blanks or above applicable Surface Water Standards for surface water points.  Cobalt (GWPS = 1 ug/L) o MW-19 @ 22.9 ug/L o MW-21 @ 1.20 ug/L (J) o MW-22 @ 1.46 ug/L (J)  Vanadium (GWPS = 0.3 ug/L) o MW-12 @ 2.29 ug/L (J) o MW-13 @ 4.17 ug/L (J) o MW-15 @ 2.95 ug/L (J) o MW-16 @ 4.37 ug/L (J) o MW-17 @ 2.43 ug/L (J) o MW-18 @ 1.70 ug/L (J) o MW-21 @ 1.64 ug/L (J) TM No quantifiable inorganic or organic constituents were detected in a well or surface water point at concentrations outside of their historical range (more than 5X previous concentrations or first-time detections). N/A Other report issues/Communications with laboratory/etc.: ATTACHMENT 3 Summary of Statistical Analysis and Statistics Summary Sheets October 2016 Page 1 of 1 0939-668716 G:\PROJECTS\Winston-Salem-Forsyth County\Groundwater\WQMR\Sept 2016\2016.10.Notification & ASD\Stats\Hanes Mill Road CLF Stats Summary Sept 2016.xlsx OW-3 OW-4 OW-6 OW-7DA OW-10D OW-11 OW-12 OW-13D OW-14D OW-17D Barium ug/L Interwell Non-Parametric Prediction Interval 12000 993 153 48.1 J 5.81 J 26.7 J 134 52.9 J 4.60 J 22.2 J 40.0 J Cobalt ug/L Interwell Non-Parametric Prediction Interval 800 10.7 2.24 J ND ND ND ND ND ND ND ND MW-6 MW-6D MW-7 MW-8 MW-9 MW-11InterwellNon-Parametric Prediction Interval 5.8 Intrawell MW-6 Non-Parametric Prediction Interval 16.0 Chromium ug/L Interwell Non-Parametric Prediction Interval 6800 ND 2.31 J ND ND ND 14.3Cobaltug/L Interwell Non-Parametric Prediction Interval 800 16.5 ND 14.5 ND ND ND MW-13 MW-14 MW-15 MW-16 MW-17 MW-18 MW-19 MW-20 MW-21 MW-22 Interwell Non-Parametric Prediction Limit 1.10 MW-19 Intrawell Tolerance Prediction Limit 52.0 Notes:1. Shaded values represent apparent statistical significant increases (SSIs) over background concentrations. 2. Statistical worksheets are provided in Appendix C. 3. ug/L = micrograms per liter 4. J = estimated concentration below the Solid Waste Section Limit5. ND = Not detected at the laboratory detection limit 6. B = Blank-qualified data 7. --- = data not available ATTACHMENT 2 Summary of Statistical Analysis Hanes Mill Road Landfill, Permit No. 34-02 Forsyth County, North Carolina ND ND NDArsenicug/L 13.5 ND ND September 2016 Closed Subtitle D Landfill Downgradient Monitoring Wells and Concentrations Detected Monitoring Constituent/Analytes Reporting Units Statistical Evaluation Method Prediction Interval Detected Monitoring Constituent/Analytes Reporting Units Prediction IntervalStatistical Evaluation Method Closed Unlined Landfill Downgradient Monitoring Wells and Concentrations September 2016 September 2016Detected Monitoring Constituent/Analytes Reporting Units Statistical Evaluation Method Prediction Interval Active Subtitle D Landfill Downgradient Monitoring Wells and Concentrations Cobalt ug/L ND ND ND 1.20 J 1.46 JNDNDND22.9 ND Closed Unlined Landfill Unlined Subtitle D Landfill Active Subtitle D Landfill ATTACHMENT 4 USGS National Geochemical Survey Database Summary October 2016 1 of 1 0939668716 G:\PROJECTS\Winston-Salem-Forsyth County\Groundwater\WQMR\Sept 2016\2016.10.Notification & ASD\Attachment 4.xlsx NURE Record ID Lab ID Collection Date Datum Latitude Longitude Medium Source Units Arsenic Barium Cobalt Chromium 5282810 C-110092 09/12/76 NAD27 35.9952 -80.2418 Sediment Stream ppm ND 2630 ND 8 5282822 C-110100 09/12/76 NAD27 35.9098 -80.2140 Sediment Stream ppm ND 1570 ND 3 5282670 C-110270 09/09/76 NAD27 35.9945 -80.0553 Sediment Stream ppm 12 174 12 7 5282584 C-110403 07/13/76 NAD27 35.9876 -80.5241 Sediment Stream ppm ND 65 36 795289680C-110410 07/13/76 NAD27 36.2632 -80.2747 Sediment Stream ppm ND 1000 11 31 5289312 C-110490 07/14/76 NAD27 36.0003 -80.4473 Sediment Stream ppm ND 348 14 28 5289485 C-110871 07/21/76 NAD27 36.2239 -80.0316 Sediment Stream ppm 12 684 8 13 5289579 C-143129 07/11/76 NAD27 36.4035 -80.1033 Sediment Stream ppm ND 267 14 42 5289450 C-143367 07/17/76 NAD27 36.1168 -80.3382 Sediment Stream ppm ND 294 10 31 5289661 C-143413 07/12/76 NAD27 36.3345 -80.3890 Sediment Stream ppm ND 464 7 30 5289470 C-143440 07/17/76 NAD27 36.2319 -80.4357 Sediment Stream ppm ND 1090 5 275282800C-144593 09/12/76 NAD27 35.9375 -80.3027 Sediment Stream ppm ND 2440 4 16 Average 2 919 10 26 Notes: 1. NURE = National Uranium Resource Evaluation 2. ID = identification 3. ND = non-detect4. Inorganic analysis performed by ICP40. 5. ppm = parts per million 6. Sample locations are within 20 miles of the Hanes Mill Road Landfill 7. Source of data is the United States Geological Survey National Geochemical Survey Database. ATTACHMENT 4 USGS National Geochemical Survey Database SummaryHanes mill Road Landfill, Permit No. 34-02