RE: Water Quality Split Samples April 2017 Charah Brickhaven Facility

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1 June 13, 2017 Mr. Brian Burkhart, P.E. Environmental Quality Director Chatham County 720 Renaissance Drive Pittsboro, North Carolina RE: Water Quality Split Samples April 2017 Charah Brickhaven Facility Dear Mr. Burkhart: Smith Gardner, Inc. (S+G) is pleased to submit these analytical results for the quarterly groundwater split-sampling event performed at the Charah Brickhaven Facility in Chatham County, on April 3-5, Field Event Summary Personnel from S+G mobilized to the site and met with representatives from Pace Analytical Services, Inc. (Pace), to perform the April sampling event. Sampling was performed from Monday, April 3 rd to Wednesday, April 5 th, The Charah groundwater monitoring network includes nine monitoring wells (MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8 and BG-1) and two surface water locations (SW-1 and SW-2) which were sampled during this event. MW-1 and BG-1 serve as the background wells for the facility. Well details are provided in Table 1. Sampling locations and a potentiometric surface are shown on Figure 1. The potentiometric surface shown is informed by historical potentiometric surfaces prepared by HDR. Groundwater samples were obtained using low flow purging and sampling with a stainlesssteel Proactive SS Mega Monsoon pump with flow rate controller, provided by Pace. The base of the pump was set approximately two feet off the bottom depth above the well base to reduce turbidity. S+G and Pace personnel purged wells until collected field parameters stabilized within the following limits: Turbidity -10% for values greater than 5 NTU (if three turbidity values are less than 5 NTU, the values are considered stabilized. Dissolved Oxygen (DO) -10% for values greater than 0.5 mg/l, if three DO values are less than 0.5 mg/l, the values are considered stabilized. Specific conductance -3%. Temperature -3% ph -0.1 unit. Oxygen Reduction Potential (ORP) -10 millivolts.

2 Mr. Burkhart June 13, 2017 Page 2 of 4 Field parameters are presented in Table 2. Samples were collected in the appropriate container provided by the laboratory and shipped, under proper chain of custody (COC), to the lab, with ice to maintain a maximum temperature of 4 degrees Celsius. Samples collected by S+G personnel were sent to Prism Laboratories, Inc. 1 (NC Certification No. 402). Prism performed analysis for metals and volatile organic compounds (VOCs), as well as total dissolved solids, chloride, fluoride and sulfate. Prism sub-contracted Summit Environmental Technologies, Inc. 2 to perform radiological analysis (Radium-226 and Radium-228) for select samples. Results from S+G samples Analytical results were compared to the NC DWM Solid Waste Section Quantitation Limits (SWSLs), 15A NCAC 2L.0200 (2L Standard), Solid Waste Section Groundwater Protection Levels (GWP) and Federal Maximum Contaminant Limits (MCL). Surface water results were compared with the NCAC 2B Standard for Class C waters (2B Standard). Constituents detected between the Method Detection Limit (MDL) and SWSL are a non-quantifiable value defined by the laboratory as a J value. Values reported below the MDL are considered nondetectable. Table 3 presents a detection summary from the April sampling event. Groundwater chemistry parameters are presented on Table 4. Detections in the leachate sample are presented in Table 5. The field data sheets are included in Attachment A and the lab report for this event is included in Attachment B. Groundwater Results Inorganic Constituents Analytical results indicated several constituents exceeded their 2L Standards in collected samples this event: Barium (MW-8) Chromium (MW-2) Several constituents were detected at concentrations that exceeded GWP Levels in samples collected this event: Cobalt (MW-4) Thallium (MW-5 and MW-6) Vanadium (BG-1, MW-1, MW-2, MW-3 and MW-8) Several constituents were detected above their MDL value but do not have any standards established. Calcium (BG-1, MW-1, MW-2, MW-3, MW-4, MW-5, MW-6 and MW-8); Lithium (MW-1, MW-2, MW-3, MW-6 and MW-8); and Molybdenum (MW-2 and MW-3). 1 Prism Laboratories, Inc. 449 Springbrook Road, Charlotte, NC Summit Environmental Technologies, Inc Win St. Cuyahoga Falls, OH 44223

3 Mr. Burkhart June 13, 2017 Page 3 of 4 Most inorganic constituents were J-values or reported as not detected above the MDL. Inorganic detections are presented in Table 3. Groundwater Chemistry Several groundwater chemistry parameters exceeded their 2L Standard in the samples collected during this event. Chloride (BG-1, MW-1, MW-2, MW-3, MW-4, MW-6 and MW-8); Sulfate (MW-2); and Total Dissolved Solids (BG-1, MW-1, MW-2, MW-3, MW-4, MW-6 and MW-8. Radiological results indicated no detections in samples collected this event. Organic Constituents Analytical results from the collected samples indicated no organic constituents were detected at concentrations above their 2L Standard, GWP level and MCLs. Surface Water Results Cobalt, copper, selenium and zinc exceeded the 2B Standard for Class C waters in the samples collected at SW-1. Calcium and vanadium in SW-1 and SW-2 were detected in collected samples, however; 2B Standards have not been established for these parameters. SW-1 is the upgradient surface water location; turbidity values measured at this location were over 500 NTU, an order of magnitude higher than other turbidity values recorded for this event. Due to sample location and the discrepancy between SW-1 and the other site samples, these detections are likely not caused by on-site activities. Leachate Results One leachate sample was collected during this event. The general chemistry parameters chloride, fluoride, sulfate and total dissolved solids were reported at detectable concentrations. Detectable concentrations for the majority of inorganic parameters were also reported in the leachate sample. Organic parameters were not detected at concentrations above MDL values in the sample collected this event. No radiological analysis was performed on this sample. Results Comparison Analytical results from this event were compared with groundwater results provided in historic monitoring reports submitted to NCDEQ. Groundwater and surface water samples from the April 2017 event were generally consistent with historic results as noted in the following instances: Barium concentrations have exceeded the groundwater standard January, February, April, May and July of 2016 and January, This constituent has been detected in the background well at concentrations below the groundwater standard; Chromium concentrations have exceeded the groundwater standard in January and February of 2016 and January, This constituent has been detected in the background well at concentrations below the groundwater standard;

4 Mr. Burkhart June 13, 2017 Page 4 of 4 Cobalt concentrations have exceeded the groundwater standard in May, 2016 and January, This constituent has been detected in the background well at concentrations below the groundwater standard; Thallium concentrations have exceeded the groundwater standard in January and February, This constituent was also detected above the groundwater standard in the sample collected from the background well in February, 2016; Vanadium concentrations have exceeded the groundwater standard in January, February, and July of 2016 and January, In several instances this constituent exceeded the standard in samples from the background well. Finally, the Background Sampling Report by HDR 3.states that samples collected prior to placement of Coal Combustion Products (CCP) exhibited exceedances of the groundwater standards for antimony, arsenic, barium, chromium, cobalt, copper and vanadium. This supports natural occurrence of these constituents in the groundwater at this facility. Table 6 presents analytical data from 2016 for comparison with the current event. If you have any questions or require additional information, please contact us at (919) or by below. Sincerely, SMITH GARDNER, INC. Madeline German, P.G. Project Geologist Joan A. Smyth, P.G. Senior Hydrogeologist Attachments: Table 1- Well Details Table 2- Field Parameters Table 3- Detected Constituents Table 4 Groundwater Chemistry Parameters Table 5 Leachate Summary Table 6 Analytical Detection Comparison Figure Potentiometric Surface Map April 2017 Attachment A Field Data Sheets Attachment B Lab Report cc: Dan Lamontagne Chatham County File 3 HDR, Inc. Background Sampling Report Brickhaven No. 2 Minetract A Charah, Inc., September, 2016.

5 Tables Water Quality April 2017 Charah Brickhaven Facility Pittsboro, North Carolina

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7 Table 1 Well Details Charah Brickhaven April 3-5, 2017 By: MG Date: 5/8/0217 Well ID Well Diameter (inches) Total Well Depth (ft. bgs) Ground Surface Elevation (ft. amsl) TOC Elevation (ft. amsl) Depth to Water (ft. btoc) Groundwater Elevation (ft. amsl) Screen Interval (ft. bgs) Screen Geology BG Layered Rock/PWR* MW-1S Layered Rock/PWR* MW Layered Rock/PWR* MW PWR MW Residuum/PWR MW PWR MW Residuum/PWR MW Residuum/PWR MW PWR Notes: 1. Top-of-casing and ground surface elevations and horizontal locations at MW-4 (PZM-1), MW-5 (PZM-22) and MW-7 (PZM-27) determined by Lawrence Surveying of Monroe, NC 2. Top-of-casing and ground surface elevations and horizontal locations at BG-1, MW-1, MW-2, MW-3, MW-6 and MW-8 determined by McAdams of Durham, NC. 3. MW-6 was re-surveyed by Charah, Inc. on December 18, 2015 after damage sustained to the monitoring well in October TD=total depth; BGS=below ground surface;toc=top of casing; DTW = Depth-to-Water; BTOC = below top-of-casing, msl = above mean sea level, ft. * = interpreted lithologic unit based on relative drilling hardness and geologic judgment during well installation amsl = above mean sea level bgs = below ground surface H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

8 Table 2 Field Parameters Charah Brickhaven April 3-5, 2017 By: MG Date: 5/8/0217 Well ID ph (Std. Units) Conductivity (umhos) Temperature (celsius) Turbidity (NTU) Dissolved Oxygen (DO) (mg/l) Oxygen Reduction Potential (ORP) (mv) BG MW MW MW MW MW MW MW MW SW SW Notes: Data Collected by S+G personel H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

9 Table 3 Detected Constituents Charah Brickhaven April 3-5, 2017 By: MG Date: 2/28/0217 Parameter MDL SWSL 2L / GWP* MCL 2B BG-1 MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-8 SW-1 SW-2 Inorganics Antimony * <0.41 < J <0.41 < J <0.41 < J 0.48 J Arsenic J < J 0.59 J Barium Beryllium * <0.068 <0.068 <0.068 <0.068 < J 0.08 J 0.13 J J Boron 4.1 NE 700 NE NE 23 J 25 J 64 J 34 J 14 J 51 J 27 J 8.3 J 32 J 41 J Cadmium < J J <0.053 < J < J 0.31 J J Calcium 7.3 NE NE NE NE Chromium J 0.64 J Cobalt * NE 4 < J 0.48 J 0.1 J J 0.52 J 0.11 J Copper J 0.55 J 1.8 J 0.89 J 0.76 J 0.99 J 0.59 J 0.66 J J Lead J 0.24 J 0.59 J 0.28 J 0.16 J 0.52 J 0.38 J 0.58 J Lithium 0.62 NE NE NE NE 23 J J 3.1 J J <0.62 Mercury J <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 <0.03 Molybdenum 0.14 NE NE NE J 0.57 J J 1.5 J 1.9 J 0.33 J 1.7 J 0.3 J Nickel NE 88 1 J 1.2 J J J 1.5 J 1.2 J Selenium <0.45 < J 1.2 J < J <0.45 < J Silver J 0.2 J 0.2 J 0.25 J 0.92 J 1.3 J 1.9 J 0.93 J 0.28 J 0.35 J Thallium * J 0.1 J J J J J 0.38 J 0.27 J Vanadium * NE NE <0.79 <0.79 < Zinc J 7.5 J 6.3 J 6.9 J J 4 J Organics Acetone NE 2000 <0.31 <0.31 <0.31 <0.31 < <0.31 < Chloroform < <0.076 <0.076 <0.076 <0.076 <0.076 <0.076 <0.076 <0.076 Note: MDL - Method Detection Limit SWSL - Solid Waste Section Quantitation Limits 2L - Groundwater Standards (15A NCAC 2L 0200) * - Groundwater Protection Standards - GWP MCL - Federal Maximum Contaminant Level 2B - NCAC 2B Standard for Class C waters BOLD - Detection above 2L, GWP, or 2B Standard J - Laboratory defined as detected byt below the Reporting Limit; therefore, result is an estimated concentration. < MDL - Not detected at or above MDL NE - Standard Not Established NA - Parameter Not Analyzed Table units are presented in ug/l. Lab analysis by Prism Laboratories, Inc. reports 4/26/2017 Work Order # ; 5/1/2017 Work Order # and 5/4/2017 Work Order # H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

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11 Table 4 Groundwater Chemistry Parameters Charah Brickhaven April 3-5, 2017 By: MG Date: 5/16/2017 Parameter Lowest MDL SWSL 2L MCL 2B BG-1 MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-8 SW-1 SW-2 Chloride (mg/l) NE 250 NE Fluoride (mg/l) J Sulfate (mg/l) NE TDS (mg/l) 1.4 NE 500 NE NE Radium 226 (pci/l) 1* NE NE 5 NE <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 Radium 228 (pci/l) 1* NE NE 5 NE <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 Note: MDL - Method Detection Limit * - Indicates PQL listed as detection limit SWSL - Solid Waste Section Quantitation Limits 2L - Groundwater Standards (15A NCAC 2L 0200) MCL - Federal Maximum Contaminant Level 2B - NCAC 2B Standard for Class C waters TDS - Total Dissolved Solids BOLD - Detection above 2L or GWP Standard J - Laboratory defined as detected byt below the Reporting Limit; therefore, result is an estimated concentration. < MDL - Not detected at or above MDL NE - Standard Not Established NA - Parameter Not Analyzed Lab analysis by Prism Laboratories, Inc. reports 4/26/2017 Work Order # ; 5/1/2017 Work Order # and 5/4/2017 Work Order # Radiological Analysis by Summit Environmental Technologies, Inc. reports 4/25/2017 WO# ; 4/20/2017 WO# and 5/3/2017 WO# H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

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13 Table 5 Leachate Summary Charah Brickhaven April 3-5, 2017 By:MG Date:5/16/2017 Parameter Unit Leachate Chloride ug/l 14 Fluoride ug/l 0.2 Sulfate ug/l 550 Total Dissolved Solids ug/l 1100 Antimony ug/l 17 Arsenic ug/l 26 Barium ug/l 130 Beryllium ug/l 0.1 J Boron ug/l 1900 Cadmium ug/l 0.11 J Calcium ug/l Chromium ug/l 1 Cobalt ug/l 11 Copper ug/l 2.9 J Lead ug/l 1.8 Lithium ug/l Molybdenum ug/l 260 Nickel ug/l 23 Selenium ug/l 24 Silver ug/l 0.23 J Thallium ug/l 0.93 J Vanadium ug/l 46 Zinc ug/l 21 Lab analysis by Prism Laboratories, Inc. reports 5/1/2017 Work Order # H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

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15 Table 6 Analytical Detection Comparison Charah Brickhaven April 3-5, 2017 By:MG Date: 5/17/2017 Parameter 2L / GWP* MCL HDR BG-1 HDR MW-1 HDR MW-2 HDR MW-3 January 2016 HDR MW-4 HDR MW-5 HDR MW-6 Inorganics Antimony 1 * 6 BDL BDL BDL BDL BDL BDL 7.6 BDL BDL BDL BDL BDL 6.5 Arsenic BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Barium Beryllium 4* 4 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Boron 700 NE Cadmium 2 5 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Calcium NE NE Chromium BDL BDL 15.8 BDL BDL BDL BDL BDL BDL BDL BDL 23.3 BDL BDL BDL BDL 23.7 BDL Cobalt 1 * NE BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Copper BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Lead BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Lithium NE NE Mercury 1 2 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Molybdenum NE NE BDL BDL BDL BDL BDL 6.8 BDL BDL BDL BDL BDL 5.6 Nickel 100 NE BDL BDL 8.7 BDL BDL BDL BDL BDL BDL BDL BDL 13.5 BDL BDL BDL BDL 13.2 BDL Selenium BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Silver BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Thallium 0.28* 2 BDL BDL BDL BDL BDL BDL BDL 13.7 BDL 10.3 BDL BDL 14.8 BDL BDL 8.8 Vanadium 0.3 * NE BDL 6.2 BDL BDL BDL BDL BDL BDL BDL 5.1 BDL BDL BDL BDL BDL BDL BDL BDL Zinc BDL BDL 13.3 BDL BDL BDL 11.3 BDL 18.7 BDL BDL 27.2 BDL BDL BDL BDL BDL 14.6 Organics Acetone 6000 NE BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Groundwater Chemistry Chloride NE Fluoride BDL BDL Sulfate NE TDS NE Radium 226 (pci/l) NE 5 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL Radium 228 (pci/l) NE 5 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL HDR MW-7 HDR MW-8 HDR BG-1 HDR MW-1 HDR MW-2 HDR MW-3 February 2016 HDR MW-4 HDR MW-5 HDR MW-6 HDR MW-7 HDR MW-8 NOTE: 2L - Groundwater Standards (15A NCAC 2L 0200) GWP - Groundwater Protection Standards (noted by * ) Table units are presented in ug/l unless otherwise stated MCL - Federal Maximum Contaminant Level BDL - Result below the specified detection limit BOLD - Detection above 2L or GWP Standard NE - Standard Not Established NA - Parameter Not Analyzed H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

16 Table 6 Analytical Detection Comparison Charah Brickhaven April 3-5, 2017 By:MG Date: 5/17/2017 Parameter 2L / GWP* MCL Inorganics Antimony 1 * 6 Arsenic Barium Beryllium 4* 4 Boron 700 NE Cadmium 2 5 Calcium NE NE Chromium Cobalt 1 * NE Copper Lead Lithium NE NE Mercury 1 2 Molybdenum NE NE Nickel 100 NE Selenium Silver Thallium 0.28* 2 Vanadium 0.3 * NE Zinc Organics Acetone 6000 NE Groundwater Chemistry Chloride NE Fluoride Sulfate NE TDS NE Radium 226 (pci/l) NE 5 Radium 228 (pci/l) NE 5 HDR BG-1 HDR MW-1 HDR MW-2 HDR MW-3 April 2016 May 2016 HDR MW-4 HDR MW-5 HDR MW-6 HDR MW-7 HDR MW-8 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 7.5 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 5.7 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 36.1 BDL BDL 47.7 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL HDR BG-1 HDR MW-1 HDR MW-2 HDR MW-3 HDR MW-4 HDR MW-5 HDR MW-6 HDR MW-7 HDR MW-8 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

17 Table 6 Analytical Detection Comparison Charah Brickhaven April 3-5, 2017 By:MG Date: 5/17/2017 Parameter 2L / GWP* MCL Inorganics Antimony 1 * 6 Arsenic Barium Beryllium 4* 4 Boron 700 NE Cadmium 2 5 Calcium NE NE Chromium Cobalt 1 * NE Copper Lead Lithium NE NE Mercury 1 2 Molybdenum NE NE Nickel 100 NE Selenium Silver Thallium 0.28* 2 Vanadium 0.3 * NE Zinc Organics Acetone 6000 NE Groundwater Chemistry Chloride NE Fluoride Sulfate NE TDS NE Radium 226 (pci/l) NE 5 Radium 228 (pci/l) NE 5 S+G BG-1 S+G MW-1 S+G MW-2 S+G MW-3 May 25-27, 2016 July 2016 S+G MW-4 S+G MW-5 S+G MW-6 S+G MW-7 S+G MW-8 BDL BDL 1 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL J BDL BDL 0.11 J J BDL J J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.6 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 1.5 BDL BDL 1.2 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.61 J 0.94 J 1.7 J 1.2 J 1.1 J 3 J 0.66 J 1.8 J 1.6 J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.15 J 0.26 J 0.04 J 0.4 J 0.16 J 0.18 J 0.24 J J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 28 BDL J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 4.1 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.6 BDL 2.8 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL J 0.16 J J J J J BDL J 0.63 J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 5.1 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 23 BDL BDL BDL BDL BDL 17.8 BDL BDL 11 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NA 0.5 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL NA 1 BDL BDL BDL BDL BDL BDL BDL BDL BDL HDR BG-1 HDR MW-1 HDR MW-2 HDR MW-3 HDR MW-4 HDR MW-5 HDR MW-6 HDR MW-7 HDR MW-8 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

18 Table 6 Analytical Detection Comparison Charah Brickhaven April 3-5, 2017 By:MG Date: 5/17/2017 Parameter 2L / GWP* MCL Inorganics Antimony 1 * 6 Arsenic Barium Beryllium 4* 4 Boron 700 NE Cadmium 2 5 Calcium NE NE Chromium Cobalt 1 * NE Copper Lead Lithium NE NE Mercury 1 2 Molybdenum NE NE Nickel 100 NE Selenium Silver Thallium 0.28* 2 Vanadium 0.3 * NE Zinc Organics Acetone 6000 NE Groundwater Chemistry Chloride NE Fluoride Sulfate NE TDS NE Radium 226 (pci/l) NE 5 Radium 228 (pci/l) NE 5 S+G BG-1 S+G MW-1 S+G MW-2 January 23-26, 2017 S+G MW-3 S+G MW-4 S+G MW-5 S+G MW-6 S+G MW-8 S+G BG-1 S+G MW-1 S+G MW-2 April 3-5, 2017 BDL BDL 0.64 J BDL BDL BDL BDL BDL BDL BDL 0.47 J BDL BDL 0.69 J BDL BDL 0.81 J BDL 0.88 J J BDL 0.51 J 0.59 J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 0.27 J 0.08 J 0.13 J 43 J J BDL BDL 20 J 4.3 J BDL 23 J 25 J 64 J 34 J 14 J 51 J 27 J 8.3 J 0.17 J 0.14 J J 0.16 J 0.12 J 0.13 J 0.13 J 0.26 J BDL 0.47 J J BDL BDL J BDL J J J 0.54 J J 0.64 J J 0.33 J 0.56 J 0.2 J J 0.63 J 0.97 J BDL 0.25 J 0.48 J 0.1 J J 0.52 J 0.11 J 2.4 J 0.82 J 3.4 J 2.1 J 1.1 J 0.76 J 1.1 J 2.2 J 0.61 J 0.55 J 1.8 J 0.89 J 0.76 J 0.99 J 0.59 J 0.66 J 0.46 J 0.42 J 0.22 J 0.2 J 0.2 J 0.23 J 0.26 J 0.48 J 0.21 J 0.24 J 0.59 J 0.28 J 0.16 J 0.52 J 0.38 J 0.58 J 14 J 20 J J BDL J J 3.1 J J BDL BDL BDL BDL BDL BDL BDL 0.03 J BDL BDL BDL BDL BDL BDL BDL BDL 0.46 J J 0.84 J J 0.18 J 0.57 J J 1.5 J 1.9 J 0.33 J 0.19 J J J J 1.2 J J J 1.5 J 1.2 J BDL BDL BDL 2.2 J 1.2 J BDL 0.56 J BDL BDL 0.19 J BDL BDL J BDL J J 0.86 J 0.44 J 0.2 J 0.2 J 0.25 J 0.92 J 1.3 J 1.9 J 0.93 J 0.22 J BDL BDL J J J J 0.11 J 0.18 J 0.1 J J J J J J 2.4 J 2 J BDL 0.97 J 1.1 J 2.5 J BDL BDL BDL J 7.5 J 6.3 J 6.9 J J 4 J BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL J J J BDL 1.23 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL 2.12 BDL 1.21 BDL BDL BDL BDL BDL BDL BDL BDL BDL BDL S+G MW-3 S+G MW-4 S+G MW-5 S+G MW-6 S+G MW-8 H:\Projects\Groundwater Monitoring\2. Groundwater Monitoring Reports\Chatham (Charah)\Water - Split Quarterly\April 2017\April17 - tables.xlsx

19 Figure Water Quality April 2017 Charah Brickhaven Facility Pittsboro, North Carolina

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21 G:\CAD\Chatham County\Chatham 16-1\sheets\CHATHAM-B0051.dwg - 6/12/2017 1:42 PM 2017 Smith Gardner, Inc. MW-8 TOC= DTW=37.36 GWE= MW-6 TOC= DTW=6.86 GWE= MW-7 TOC= DTW=16.12 GWE= MW-1 TOC= DTW=60.40 GWE= MW-5 TOC= DTW=23.33 GWE= APPROXIMATE LINER LIMIT MW-2 TOC= DTW=28.34 GWE= MW-3 TOC= DTW=20.00 GWE= MW-4 TOC= DTW=13.83 GWE= BG-1 TOC= DTW=11.58 GWE= MW-1 TOC= DTW= GWE= FIGURE NO. PREPARED BY: SCALE: DRAWN: APPROVED: PREPARED FOR: NC LIC. NO. F-1370 (ENGINEERING) +GARDNER SMITH C.T.J. M.M.G. AS SHOWN 1 FILENAME: PROJECT NO: DATE: 14 N. Boylan Avenue, Raleigh NC Jun 2017 CHATHAM 16-1 CHATHAM-B0051 CHARAH, INC. MONCURE, NORTH CAROLINA POTENTIOMETRIC SURFACE MAP APRIL 2017

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23 Attachment A Field Data Sheets Water Quality April 2017 Charah Brickhaven Facility Pittsboro, North Carolina

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26 Chatham County Chatham 16-1 Charah - Brickhaven SH

27 Chatham County Chatham 16-1 Charah - Brickhaven SH

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30 Chatham County Chatham 16-1 Charah - Brickhaven SH

31 Chatham County Chatham 16-1 Charah - Brickhaven SH

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34 Chatham County Chatham 16-1 Charah - Brickhaven SH

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37 Chatham County Chatham 16-1 Charah - Brickhaven SH

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41 Attachment B Lab Report Water Quality April 2017 Charah Brickhaven Facility Pittsboro, North Carolina

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