INITIAL ANNUAL GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT FOR YEAR 2017 FOR ASH BASIN 6

Transcription

1 INITIAL ANNUAL GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT FOR YEAR 2017 FOR ASH BASIN 6 U.S. EPA COAL COMBUSTION RESIDUALS (CCR) RULE BRUNNER ISLAND STEAM ELECTRIC STATION EAST MANCHESTER TOWNSHIP YORK COUNTY, PENNSYLVANIA Prepared for: BRUNNER ISLAND, LLC East Manchester Township York County, Pennsylvania Prepared by: West Chester, PA and the V.F. BRITTON GROUP, LLC Wayne, PA AGC Project No: January 31, 2018

2 TABLE OF CONTENTS PAGE NO. 1.0 Introduction Purpose Site Location Groundwater Monitoring Network Geologic Setting Hydrogeology Regional Flow Groundwater Movement Water Bearing Zones Ccr-Rule Monitoring Well Network Overview Monitoring Well Installation Water Level Measurement Groundwater Sampling Statistical Analysis Corrective Actions Anticipated Upcoming Activities Certification LIST OF TABLES TABLE 1 CCR Rule Monitoring Well Construction Overview 2 Groundwater Analytical Testing Results LIST OF FIGURES FIGURE 1 Site Location Map 2 Monitoring Well Locations for CCR Groundwater Monitoring 3 Schematic Conceptual Cross Section Local Geology 4 Schematic Cross Section Conceptual Regional Groundwater Movement Vertical Component 5 Existing Groundwater Elevation Contour Active Discharge 6 Static Groundwater Elevation Contour No Active Discharge to Basin 6 7 MW-6-3 Area 8 Hydrogeologic Cross Section - MW-6-3 Area i

3 1.0 INTRODUCTION 1.1 PURPOSE The United States Environmental Protection Agency (USEPA) issued 40 CFR 257, Subpart D, Disposal of Coal Combustion Residuals from Electric Utilities (CCR Rule) on April 17, The CCR Rule regulates disposal of coal combustion residuals (CCR) in CCR landfills and impoundments. Advanced GeoServices Corp. and the V.F. Britton Group, LLC (Advanced GeoServices) have prepared this Initial Annual Groundwater Monitoring and Corrective Action (GWMCA) Report for Ash Basin 6, a state-permitted ash impoundment, located at the Brunner Island Stream Electric Station (Brunner) in East Manchester Township, York County, Pennsylvania. The CCR Rule states the following requirements for the GWMCA Report (40 CFR ): (e) Annual groundwater monitoring and corrective action report. For existing CCR landfills and existing CCR surface impoundments, no later than January 31, 2018, and annually thereafter, the owner or operator must prepare an annual groundwater monitoring and corrective action report. For new CCR landfills, new CCR surface impoundments, and all lateral expansions of CCR units, the owner or operator must prepare the initial annual groundwater monitoring and corrective action report no later than January 31 of the year following the calendar year a groundwater monitoring system has been established for such CCR unit as required by this subpart, and annually thereafter. For the preceding calendar year, the annual report must document the status of the groundwater monitoring and corrective action program for the CCR unit, summarize key actions completed, describe any problems encountered, discuss actions to resolve the problems, and project key activities for the upcoming year. For purposes of this section, the owner or operator has prepared the annual report when the report is placed in the facility s operating record as required by (h)(1). At a minimum, the annual groundwater monitoring and corrective action report must contain the following information, to the extent available: (1) A map, aerial image, or diagram showing the CCR unit and all background (or upgradient) and downgradient monitoring wells, to include the well identification numbers, that are part of the groundwater monitoring program for the CCR unit; (2) Identification of any monitoring wells that were installed or decommissioned during the preceding year, along with a narrative description of why those actions were taken; 1-1

4 (3) In addition to all the monitoring data obtained under through , a summary including the number of groundwater samples that were collected for analysis for each background and downgradient well, the dates the samples were collected, and whether the sample was required by the detection monitoring or assessment monitoring programs; (4) A narrative discussion of any transition between monitoring programs (e.g., the date and circumstances for transitioning from detection monitoring to assessment monitoring in addition to identifying the constituent(s) detected at a statistically significant increase over background levels); and (5) Other information required to be included in the annual report as specified in through (f) The owner or operator of the CCR unit must comply with the recordkeeping requirements specified in (h), the notification requirements specified in (h), and the internet requirements specified in (h). This Report has been prepared to satisfy these requirements. 1.2 SITE LOCATION The Brunner Island Steam Electric Station (Brunner) is an active electric generation facility located on the west bank of the Susquehanna River in East Manchester Township, York County, Pennsylvania. Figure 1 provides a site location map for the facility. Brunner is owned and operated by Brunner Island, LLC. Ash Basin 6 (Basin 6) is located on the southern end of Brunner Island and is bordered to the east by the Susquehanna River and to the west by Black Gut Creek. Basin 6 is an active coal ash impoundment. When the plant is fully operational, process water discharges into Basin 6, where sediments settle in a settling pond. Water is then routed to a polishing (clarifying) pond located directly southeast of the settling pond. Treated water discharges to the Susquehanna River via an NPDES-permitted outfall. The remaining portion of water recharges into Basin 6, creating a groundwater mound and subsequent radial flow outward from the basin footprint. Figure 2 provides a general site plan showing the existing CCR Rule groundwater monitoring well network that currently exists within the area of Basin

5 Basin 6 consists of earthen berms around the perimeter of the basin which have been lined with an impervious clay material on the inside of the berms. The bottom of the basin has not been lined and allows some of the water to infiltrate though the bottom of the basin. Prior to the development of the area, sediments from the Susquehanna River had built up Brunner Island. These sediments consist of a silty clay material overlaying a sand and gravel layer. This unconsolidated material lies directly on top of a fractured bedrock which has been carved over time by the Susquehanna River. It is understood that the earthen berms constructed for Basin 6 were constructed directly on top of the bedrock material, and that most of the unconsolidated materials underlying the berm footprint were removed. Figure 3 provides a schematic cross-section through the Basin 6 area. Ash in Basin 6 is currently being excavated and beneficially used at an off-site location. 1-3

6 2.0 GROUNDWATER MONITORING NETWORK The CCR Rule also outlines well installation, development, sampling, and decommissioning requirements. The CCR Rule requires the owner or operator to obtain a certification from a qualified professional engineer stating that the groundwater monitoring system has been designed and constructed as outlined above. A detailed description and justification for the Basin 6 groundwater monitoring network is detailed in the report entitled Groundwater Monitoring System Plan (Advanced GeoServices, October 2017). Basin 6 has been monitored for numerous years in accordance with state permit requirements and there is a good understanding of the site characteristics, as described in the following sections. 2.1 GEOLOGIC SETTING The Basin 6 site area is generally underlain by the Triassic Age New Oxford Formation which consists of a shale unit and a conglomerate unit. The very southern tip of the site is underlain by the Cambrian Age Ledger Formation which consists of dolomite. The contact between the Triassic and Cambrian age rock is an apparent angular unconformity. The bedrock is overlain by native sand and gravel and silty clay (see Figure 3). The local bedrock geology is evident based on outcrops along the roadway and railroad tracks that are west of Black Gut Creek. Several strike and dip measurements were collected from the outcrops to identify the bedrock structural orientation. Based on the measurements, the bedding of the New Oxford Formation has an average strike of N45 E and dips to the northwest approximately 12. Joint sets were evident in near vertical orientations perpendicular to the strike orientation. As discussed above, Basin 6 is surrounded by earthen berms that were constructed directly on the surface of the bedrock. During the construction of these berms, overburden material (sand, gravel, and silty -clay) were excavated to the top of bedrock in the area of the berms. This resulted in the absence of overburden along the edge of the berm; however, the native overburden was untouched 2-1

7 in the central portion of Basin 6 and coal ash material was placed directly on the overburden material. Figure 3 provides a schematic cross section of Basin HYDROGEOLOGY Regional Flow Brunner Island (specifically the Basin 6 area) is located on an island, with the Susquehanna River bordering the east side and a small tributary (Black Gut Creek) bordering the west side of the island (see Figure 2). Topographic highlands exist to the west of Brunner Island with groundwater moving from the highland recharge zone to the east toward Black Gut Creek locally and the Susquehanna River regionally. Thus, Brunner Island is isolated hydrogeologically from the topographic highlands to the west which also prevents potential contaminants emanating from Brunner Island from migrating westward past Black Gut Creek and impacting properties west of Brunner Island. The regional flow characteristics result in an upward vertical groundwater gradient under the footprint of Brunner Island hindering the vertical migration of any potential contaminants downward into the groundwater column. Figure 4 provides a schematic cross section which shows the conceptual regional vertical groundwater movement associated with Basin Groundwater Movement Under fully operational plant conditions, process water enters Basin 6. Based on review of sitespecific groundwater elevation data in March, April, June, and July 2017 and on groundwater modeling completed for Basin 6, the plant process water that is discharged to the surface of Basin 6 is creating a groundwater mound under the basin with radial flow outward. It is estimated that up to one-million gallons of water per day infiltrates into Basin 6 as a result of the plant process water (estimated up to 5-million gallons/day) entering Basin 6. The majority of water discharges though the NPDES-permitted outfall. 2-2

8 Figure 5 provides a mean groundwater elevation contour map of the four sets of water level data collected in March, April, June, and July It should be noted that vertical groundwater elevation fluctuation is minimal and does not result in changes to the radial groundwater flow characteristics indicated on Figure 5. The average groundwater elevation below Basin 6 is 280 feet Mean Sea Level (ft MSL) which is within the ash material and above the overburden material Water Bearing Zones The CCR rule requires monitoring of the upper-most aquifer under the CCR unit. As discussed above, Basin 6 is underlain by a native silty clay and a sand and gravel layer. This overburden material overlies the fractured bedrock system. Piezometers installed near the northwest corner of Basin 6 penetrate both the overburden and the bedrock material. Based on water level data collected in these paired piezometers, it was evident that a slight upward vertical gradient exists typical of discharge zone hydraulics; a characteristic that would be expected in this area. Evaluation of this area suggests that the potentiometric surface observed in the overburden and bedrock wells is connected. A separate overburden water bearing zone does not exist. Based on published geologic data, it is apparent that the bottom of the aquifer can range from 100 to 400 feet below the ground surface where the fractures in the bedrock (secondary porosity) no longer transmit groundwater. Based on site-specific data collected from the area, the hydraulic conductivity of the bedrock zone is transitional with depth with approximate upper, middle, and deep values of 0.24, 7.54, and 0.91 feet per day, respectively. However, this is not consistent over the entire Brunner Island area. Low hydraulic conductivity in the upper portion of the bedrock has been suggested in geologic publications to be the result of silt and clay filling in the shallow rock fractures which reduce the conductivity. Clay-filled fractures in the bedrock were generally not observed on the site. 2-3

9 2.3 CCR-RULE MONITORING WELL NETWORK OVERVIEW The CCR rule states that wells monitoring a CCR unit must be installed in the upper most aquifer. Overburden and bedrock piezometers were previously installed on the perimeter of the northwest portion of Basin 6 (see Figure 7). Water levels in paired overburden wells and the bedrock wells proximate to the northwest corner of Basin 6 show similar water elevations with a slight upward vertical gradient. Figure 8 provides a hydrogeological cross-section through this area. Further evaluation of this area suggests that a separate water-bearing zone does not exist in the overburden material, but rather that the water levels observed in the overburden wells/piezometers are actually the potentiometric surface of the bedrock water-bearing zone. As indicated in Figure 5, the structure of Ash Basin 6 results in a radial flow pattern. There is no appropriate location on the island for a background well. Therefore, a new background well was installed at an off-site location, with general concurrence from the Pennsylvania Department of Environmental Protection (PADEP). Eight (8) monitoring wells (including 2 new wells, MW-6-7 and MW-6-8 installed in March 2016) located near the perimeter of the basin and one (1) new off-site background well (MW-BG-1) have been selected for use in the groundwater detection monitoring plan. The general well construction for these nine (9) wells is provided on Table 1, and their locations are shown on Figure MONITORING WELL INSTALLATION Two (2) new wells (named MW-6-7 and MW-6-8) adjacent to Basin 6, and the new off-site well MW-BG-1 were installed, in accordance with appropriate state regulations and in conformance with the CCR rule, by a licensed monitoring well drilling contractor during March Table 1 provides the construction of these wells, and Figure 2 provides the well locations. The new 4-inch wells were, screened to monitor the uppermost aquifer at the site and constructed in a similar fashion to the preexisting site wells. 2-4

10 Upon completion of the well installation activities, the wells were developed to clear the wells of turbidity. The pumping rate was kept low to promote an approximate 50% drawdown of the static water level (based on the static water level to the bottom of the well). The wells have new dedicated low-flow bladder pumps installed by Talen personnel, so that the pump s intakes are positioned in the center of the well screen interval. Tubing and fittings were installed at the well head in the same manner as the existing wells for future sampling events. HydraSleeve sampling may be utilized at some future date (if the Pennsylvania Department of Environmental Protection (PADEP) concurs. The new monitoring wells were surveyed by a Pennsylvania licensed professional surveyor for their PVC casing elevation and horizontal location. The results of the survey are presented on Table WATER LEVEL MEASUREMENT Groundwater level measurements were collected for each groundwater sampling event in 2017 prior to purging (March, April, June, and July 2017). These measurements were performed by using an electronic depth-to-water meter and measured to the nearest 0.01 feet from the indicated survey mark at the top of each PVC well casing identified in Table 1. This procedure allows a depth measurement from the survey mark to the groundwater table to be converted to a groundwater table elevation. Results of the data are discussed in Section

11 3.0 GROUNDWATER SAMPLING Eight (8) rounds of groundwater samples were collected and tested for Appendix III and Appendix IV parameters to characterize baseline conditions. The parameters, or constituents, associated with each appendix are provided below: Appendix III Parameters Boron Calcium Chloride ph Sulfate Total Dissolved Solids (TDS) Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Appendix IV Parameters Lead Lithium Mercury Molybdenum Selenium Thallium Radium 226 & 228 The sampling events occurred during the following periods: April 2016 June 2016 September 2016 December 2016 March 2017 April 2017 June 2017 July 2017 A detection monitoring event (Sample #9) was completed in September 2017 and analyzed for Appendix III parameters. The September 2017 detection monitoring event was used for statistical evaluation described in Section 4.0 of this Report. Sample collection was performed in accordance with Talen procedures for low-flow sampling. In addition to the CCR Rule Appendix III constituents mentioned above, groundwater depth, field ph, field Redox, field turbidity, total alkalinity, and iron were analyzed. For every 10 or fewer groundwater sampling points collected during a CCR Rule sampling event at Basin 6, a duplicate sample was collected. Matrix spike and matrix spike duplicates were included in analytical batches per specific test method requirements to assess matrix effects on laboratory precision and accuracy. The results of laboratory testing are provided as Table

12 4.0 STATISTICAL ANALYSIS 40 C.F.R (f) defines the statistical analysis methods to determine whether a statistically significant increase (SSI) of any Appendix III parameter has occurred. 40 C.F.R (h) (1) further instructs that the SSI for each parameter at each well will statistically be compared to background data. The sampling events required to commence the SSI analysis (as scheduled for early 2018) were completed in A Certification defining the Statistical Method, Selection of Statistical Method Certification Groundwater Monitoring and Analysis Program for Ash Basin 6 (Advanced GeoServices, October 2017), for evaluating possible statistically-significant increases (SSI) in concentrations of Appendix III groundwater constituents, was placed on the Talen CCR Rule publicly-accessible website. 4-1

13 5.0 CORRECTIVE ACTIONS Ash above the water table within the basin is currently being excavated and the ash is being beneficially reused off-site. It is anticipated that this process will take 15 years to complete (from start to finish). Further actions, if and as needed, regarding assessment and/or corrective action, will be described in future CCR-rule required documents. 5-1

14 6.0 ANTICIPATED UPCOMING ACTIVITIES During the 2018 calendar year, the following activities are anticipated to occur relative to implementation of groundwater-related requirements of the CCR Rule: Complete Statistical Analysis to determine whether an SSI has occurred. If an SSI has not occurred, Detection Monitoring and reporting will continue through If an SSI has occurred, the following would occur: Establish and implement an Assessment Monitoring Program (AMP); Provide required notices that an AMP has been established; Establish Groundwater Protection Standards (GWPS) for Basin 6; and Determine whether constituents are detected as statistically significant levels (SSL) above the GWPS. Other actions may also be completed, if/as necessary, in accordance with the CCR regulations, depending on the results of the above analyses. 6-1

15 7.0 CERTIFICATION CCR Impoundment Information Name: Ash Basin 6 Operator: Brunner Island, LLC Address: 1400 Wago Road, York Haven, PA Qualified Professional Engineer: Name: Christopher T. Reitman, P.E. Company: Advanced GeoServices Corp. I, Christopher Reitman, certify that this Initial Annual Groundwater Monitoring and Corrective Measures Report for 2017 for Ash Basin 6 has been compiled to meet the requirements of the Coal Combustion Residual (CCR) rule 40 CFR (e). I am a duly licensed Professional Engineer under the laws of the Commonwealth of Pennsylvania. Print Name: Christopher T. Reitman Signature: Date: January 31, 2018 License Number: P.E My license renewal date is September 30, 2019 Qualified Professional Geologist: Name: Val F. Britton Company: V.F. Britton Group, LLC I, Val F. Britton, certify that this Initial Annual Groundwater Monitoring and Corrective Measures Report for 2017 for Ash Basin 6 has been compiled to meet the requirements of the Coal Combustion Residual (CCR) rule 40 CFR (e). I am a duly licensed Professional Geologist under the laws of the Commonwealth of Pennsylvania. Print Name: Val F. Britton Signature: Date: January 31, 2018 License Number: P.G My license renewal date is September 30, 2019 G:\Projects\2015\ Brunner Detection Monitoring Systems\Work Documents\GW_2017 Annual GWMCA Report\Basin 6\FINAL\FINAL_Basin 6_2017 GWMCA Report_ docx 7-1

16 TABLES

17 TABLE 1 CCR RULE MONITORING WELL CONSTRUCTION OVERVIEW Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Well NORTHING PA SOUTH NAD83 EASTING NAD83 PA SOUTH TOIC Elevation (Ft. MSL) NAVD88 Diameter (Inch) Total Depth (Ft. BGS) Screen Interval (Ft. BGS) Material Screened MW Alluvium & Fill MW-6-3N Alluvium & Bedrock MW ' Alluvium & Fill MW Alluvium & Fill PZ-6-5B Bedrock MW Alluvium & Bedrock MW Alluvium & Bedrock MW Alluvium & Bedrock MW-BG Bedrock Northings, Eastings, and TOIC for all wells except MW-BG-1 were developed by Kimball Surveying based on surveying completed on June 5-7 and July 18, 2017 for V.F. Britton Group Northings, Eastings, and TOIC for MW-BG-1 was provided to Advanced GeoServices by Cross Roads Surveying G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 1_Basin 6-Well Overview 1 of 1

18 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location MW-6-2 MW-6-2D MW-6-3N MW-6-4 MW-6-6 PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 Sample Name BR 6-2 BR 6-2D BR 6-3N BR 6-4 BR 6-6 BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG-1 Lab ID Date Sampled 4/26/2016 8:11 4/26/2016 8:11 4/26/ :45 4/26/ :47 4/26/2016 8:08 4/26/ :40 4/26/ :05 4/26/ :26 4/26/ :24 4/26/2016 8:37 Matrix Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Remarks FD of BR 6-2 Event ID Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Basin 6 Round 1 Parameters Units Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Appendix III Parameters Chloride J J 0.05 Lab ph * S.U Sulfate Total Dissolved Solids Boron, Total J J 20 Calcium, Total Boron, Dissolved J 20 Calcium, Dissolved Field Parameters ph field reading ** S.U Appendix IV Parameters J J 0.05 Radiochemistry *** Radium-226 pci/l / / U / U / U / U / U / U / U / / U Radium-228 pci/l / U / U / U / U / U / / U / / / Antimony, total U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U 2 Arsenic, total J J J J 0.5 Barium, total Beryllium, total Cadmium, total U 0.2 U J J 0.2 U J J 0.2 U U 0.2 Chromium, total Cobalt, total U 5 U 5 U 5 U 5 U 5 U 5 U J 5 U 5 U 5 Lead, total U 0.5 U J U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 Lithium, total Mercury, total J 0.05 U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 Molybdenum, total J J U J U 5 Selenium, total J J J J 0.2 U 0.2 U J J 0.2 U 0.2 U 0.2 Thallium, total U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 Antimony, dissolved U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U 2 Arsenic, dissolved J J J J 0.5 Barium, dissolved Beryllium, dissolved Cadmium, dissolved U 0.2 U J J 0.2 U J J 0.2 U U 0.2 Chromium, dissolved Cobalt, dissolved U 5 U 5 U 5 U 5 U 5 U 5 U J 5 U 5 U 5 Lead, dissolved U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 Lithium, dissolved Mercury, dissolved J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 Molybdenum, dissolved 2.38 J J U J U 5 Selenium, dissolved J 0.2 U J J 0.2 U J J 0.2 U 0.2 U 0.2 Thallium, dissolved J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 Notes: - milligrams per liter J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection - micrograms per liter LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C S.U. - Standard Units NS - Not sampled * Laboratory ph analyzed outside of the method hold time pci/l - picocuries per liter P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation DL - Detection Limit Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc FD - Field Duplicate R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 1 and 9

19 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-4D MW-6-6 PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-4 BR 6-4D BR 6-6 BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /7/ :10 6/7/2016 8:50 6/8/2016 8:35 6/8/2016 8:35 6/14/ :20 6/14/ :25 6/15/ :47 6/15/2016 8:10 6/6/ :21 6/6/ :13 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-4 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Basin 6 Round 2 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J J J J J /-1.13 U /-1.04 U / U / U / U / U /-1.14 U / U / U / U / / / / U / U / U / U / / / U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J U J U J J J 0.2 U 0.2 U J 0.2 U U 0.2 U 5 U 5 U 5 U 5 U 5 U 5 U J J 5 U U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J U U U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U 0.2 U 0.2 U 0.5 U 0.5 U J 0.5 U 0.5 U J J 0.5 U 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J U J U J J J 0.2 U J J 0.2 U U 0.2 U 5 U 5 U 5 U 5 U 5 U 5 U J J 5 U U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J U J U J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U 0.2 U J 0.5 U 0.5 U 0.5 U J 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 2 and 9

20 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-6 MW-6-6D PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 MW 6-2 BR 6-3N BR 6-4 BR 6-6 BR 6-6D BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /14/ :20 9/20/2016 8:49 9/13/2016 8:25 9/14/2016 9:35 9/14/2016 9:35 9/14/ :36 9/13/ :38 9/13/ :07 9/12/ :20 9/12/ :40 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-6 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Basin 6 Round 3 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J J J / U / U / U / U / U / U / U / U / U / U / / / / / U / / U / / U / U 2 U 2 U 2 U 2 U 2 U J 2 U J 2 U J J J J J J J J 0.2 U 0.2 U J J J 0.2 U 0.2 U 5 U 5 U 5 U 5 U 5 U 5 U J J 5 U 5 U J 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J 0.05 U J U 5 U J U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U J 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J U J J 0.2 U 0.2 U 0.2 U J U 0.2 U 5 U 5 U 5 U 5 U 5 U 5 U J 5 U 5 U 5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J 0.05 U J U 5 U J U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U J 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 3 and 9

21 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-2D MW-6-3N MW-6-4 MW-6-6 PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-2D BR 6-3N BR 6-4 BR 6-6 BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /7/2016 8:35 12/7/2016 8:35 12/13/2016 8:30 12/6/2016 8:24 12/7/ :13 12/5/ :50 12/6/ :48 12/6/ :10 12/5/2016 9:55 12/5/ :43 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-2 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Basin 6 Round 4 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J / U / U / U / U / U / U / U / U / U / U / / / U / / U / U / / U / / U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J U 0.2 U J J 0.2 U J J U 0.2 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U J 0.05 U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J J U U U J J 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J U 0.2 U J J 0.2 U J J J U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.05 U J 0.05 U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J J U U U J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 4 and 9

22 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-3ND MW-6-4 MW-6-6 PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-3ND BR 6-4 BR 6-6 BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /7/ :40 3/7/2017 8:19 3/7/2017 8:19 3/8/2017 8:26 3/7/ :48 3/6/ :17 3/8/ :21 3/8/ :31 3/6/ :23 3/6/ :16 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-3N Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Basin 6 Round 5 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J X X X J J J J J / U / U / U / U / U / U / U / U / U / U / / U / / U / U / / / / / U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J U J J J 0.2 U J J 0.2 U J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U J 0.5 U 0.5 U U J J 0.05 U 0.05 U J J 0.05 U 0.05 U 0.05 U J U U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U 0.2 U 0.2 U J 0.5 U 0.5 U 0.5 U 0.5 U J J J 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J J J J 0.2 U 0.2 U 0.2 U J J J 0.2 U U J J 0.05 U 0.05 U J J J 0.05 U 0.05 U J J J 5 U 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U 0.2 U 0.2 U J J J J J J J J 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 5 and 9

23 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-4D MW-6-6 PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-4 BR 6-4D BR 6-6 BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /25/ :13 4/25/ :27 4/25/2017 8:30 4/25/2017 8:30 4/25/ :17 4/25/ :03 4/25/ :52 4/25/ :27 4/24/2017 8:33 4/25/2017 8:33 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-4 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Basin 6 Round 6 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J J J / U / U / U / U / / U / U / U / U / U / / / / / U / U / U / U / / U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U J J J J J U J J J 0.2 U 0.2 U J J U 0.2 U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J J 0.05 U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J U J U J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U 0.2 U 0.2 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U J J J J J J J J J 0.2 U 0.2 U J J J 0.2 U 0.2 U 0.5 U J J J 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J J J J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J U J U J 0.2 U 0.2 U J J 0.2 U J J J 0.2 U J 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 6 and 9

24 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-6 MW-6-6D PZ-6-5B MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-4 BR 6-6 BR 6-6D BR PZ65B BR 6-7 BR 6-8 BR 8-2 BR BG /6/ :20 6/13/2017 8:21 6/6/2017 8:07 6/7/2017 8:18 6/7/2017 8:18 6/7/ :22 6/6/ :06 6/7/ :01 6/6/2017 8:05 6/5/ :24 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-6 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Basin 6 Round 7 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J J J J / U / / U / / / U / U / U / U / U / U / U / / / / / U / / / U U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J J U J J 0.2 U 0.2 U J J J J J 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J U J 0.05 U 0.05 U 0.05 U J 0.05 U J J J J U 5 U U J 0.2 U 0.2 U 0.2 U 0.2 U J J J J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J J 0.5 U 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J J U J J 0.2 U 0.2 U J 0.2 U J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U U J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J J U 5 U U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J J 0.2 U 0.2 U 0.5 U 0.5 U 0.5 U J 0.5 U J J 0.5 U 0.5 U 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 7 and 9

25 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-6 PZ-6-5B PZ-6-5BD MW-6-7 MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-4 BR 6-6 BR PZ65B BR PZ65BD BR 6-7 BR 6-8 BR 8-2 BR B /25/ :35 7/25/2017 9:42 7/25/ :57 7/25/ :30 7/25/ :53 7/25/ :53 7/25/ :15 7/25/2017 8:03 7/27/2017 8:26 7/25/2017 8:14 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of PZ 6-5B Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Basin 6 Round 8 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J J J J J / / U / U / / / / U / U / U / / U / U / U / / U / U / U / / U / U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J J J 0.2 U 0.2 U 0.2 U J J U J J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J U U 5 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U J 0.2 U 0.5 U 0.5 U 0.5 U 0.5 U 0.5 U J 0.5 U 0.5 U 0.5 U 0.5 U 2 U 2 U 2 U 2 U 2 U J 2 U 2 U 2 U J J J J J J J 0.2 U 0.2 U J J J J 0.2 U J J J 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U J 0.05 U J U U J 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U J 0.2 U 0.2 U J 0.5 U 0.5 U 0.5 U J 0.5 U J 0.5 U 0.5 U J 0.5 J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 8 and 9

26 TABLE 2 GROUNDWATER SAMPLING RESULTS Ash Basin 6, Brunner Island Steam Electric Station East Manchester Township York County, PA AGC Project No.: Sample Location Sample Name Lab ID Date Sampled Matrix Remarks Event ID Parameters Appendix III Parameters Chloride Lab ph * Sulfate Total Dissolved Solids Boron, Total Calcium, Total Boron, Dissolved Calcium, Dissolved Field Parameters ph field reading ** Appendix IV Parameters Radiochemistry *** Radium-226 Radium-228 Antimony, total Arsenic, total Barium, total Beryllium, total Cadmium, total Chromium, total Cobalt, total Lead, total Lithium, total Mercury, total Molybdenum, total Selenium, total Thallium, total Antimony, dissolved Arsenic, dissolved Barium, dissolved Beryllium, dissolved Cadmium, dissolved Chromium, dissolved Cobalt, dissolved Lead, dissolved Lithium, dissolved Mercury, dissolved Molybdenum, dissolved Selenium, dissolved Thallium, dissolved Notes: - milligrams per liter - micrograms per liter S.U. - Standard Units pci/l - picocuries per liter DL - Detection Limit FD - Field Duplicate Units S.U. S.U. pci/l pci/l MW-6-2 MW-6-3N MW-6-4 MW-6-6 PZ-6-5B MW-6-7 MW-6-7D MW-6-8 MW-8-2 MW-BG-1 BR 6-2 BR 6-3N BR 6-4 BR 6-6 BR PZ65B BR 6-7 BR 6-7 D BR 6-8 BR 8-2 BR BG /13/2017 8:17 9/13/ :26 9/12/2017 9:38 9/13/ :35 9/12/ :28 9/12/ :30 9/12/ :30 9/12/ :46 9/11/2017 0:00 9/11/ :19 Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater Groundwater FD of BR 6-7 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Basin 6 Round 9 Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ Result Q LOQ J J, S J J J - Analyte detected below limit of quantitation and above limit of detection. U - Analyte was not detected above the limit of detection LOQ - Limit of Quantitation X - Oven temperature was outside 180+/-2 o C degree method criteria at 177 o C NS - Not sampled * Laboratory ph analyzed outside of the method hold time P- Sample not preserved properly ** Field ph is not certified in NELAC Scope of Accreditation Q - Qualifier *** Radiochemistry analyzed by HawkMtn Labs Inc R - Replicate recovery outside accepted recovery limits G:\Projects\2015\ Brunner Detection Monitoring Systems\Sec Files\Reports\GW_2017 Annual GWMCA Reports\Basin 6\Tables\Table 2_Basin 6 GW lab results table_app III 9 and 9

27 FIGURES

28 Engineering for the Environment. Planning for People. F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg TM

29 Engineering for the Environment. Planning for People. F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg 2 TM

30 F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg Engineering for the Environment. Planning for People. TM

31 F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg Engineering for the Environment. Planning for People. TM

32 Engineering for the Environment. Planning for People. F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg TM 01/16/18

33 Engineering for the Environment. Planning for People. F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg TM

34 Engineering for the Environment. Planning for People. F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg TM

35 F:\Projects\2015\ Brunner Detection Monitoring Systems\Cad\Drawings\Ash Basin 6 Updated Figures.dwg Engineering for the Environment. Planning for People. TM