2017 GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT ASH BASIN 1 MONTOUR STEAM ELECTRIC STATION DERRY TOWNSHIP MONTOUR COUNTY, PENNSYLVANIA

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1 2017 GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT ASH BASIN 1 MONTOUR STEAM ELECTRIC STATION DERRY TOWNSHIP MONTOUR COUNTY, PENNSYLVANIA Prepared For: WASHINGTONVILLE, PENNSYLVANIA Prepared By: CIVIL & ENVIRONMENTAL CONSULTANTS, INC. PITTSBURGH, PENNSYLVANIA CEC Project JANUARY 31, 2018 Revised July 9, 2018 (Baseline radium data corrected)

2 TABLE OF CONTENTS 1.0 INTRODUCTION SITE OVERVIEW Background Geologic Setting Hydrogeologic Setting Conceptual Model Hydrogeologic Characteristics EXISTING MONITORING NETWORK GROUNDWATER SAMPLING SUMMARY Baseline Sampling Event Detection Monitoring Event Record Keeping Requirements... 7 Figure 1 Site Location Map Basin 1 Figure 2 Site Layout Plan Basin 1 FIGURES Figure 3 Federal CCR Rule Basin 1, Groundwater Sampling Locations TABLES Table 1 Baseline Sampling Data 1.1 MW MPZ-14S 1.2 MW MPZ-21S 1.3 MW MPZ-23S 1.4 MW MPZ-24S 1.5 MW MPZ-25S 1.6 MW PZ MW 1-14 Table 2 Detection Monitoring Data, Round 1 -i GWMCA Report, B1 January 2018 Rev. July 2018

3 1.0 INTRODUCTION The United States Environmental Protection Agency (USEPA) issued 40 C.F.R. 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 new and active landfills and impoundments. Civil & Environmental Consultants, Inc. (CEC) has been engaged by Montour, LLC to complete the 2017 Groundwater Monitoring and Corrective Action Report at Ash Basin 1 (Site) of the Montour Steam Electric Station (Montour) as required by the CCR Rule. This document summarizes the monitoring activity through 2017, including sampling events and any changes to the network. It is intended that this document will be placed in the facility operating record as required by 40 C.F.R (h)(1), as well as posted on the publicly accessible website as required by 40 C.F.R (h)(1) GWMCA Report, B1 January 2018 Rev. July 2018

4 2.0 SITE OVERVIEW 2.1 BACKGROUND Basin 1 is a 155-acre unlined, earthen dike disposal impoundment placed in service in 1972 (Figure 1). Basin 1 was used for the disposal of plant-generated residual waste, including fly ash, bottom ash, and mill rejects. Currently, bottom ash fines settle out in the Basin, and conditioned fly ash is used in the Basin as structural fill in preparation for ultimate basin closure. During construction of the impoundment, soils were excavated within the basin perimeter. The dike along the northwestern, southwestern, and southeastern side of the impoundment was constructed of excavated clay and weathered shale fragments. The dike in the northeastern portion of the impoundment is anchored into a shallow bedrock high present in this area. A French Drain collection system is located on the northwestern side of the Basin that collects seepage water and conveys it back to the Basin. The French Drain consists of a buried interceptor trench at the downstream toe of the northwestern dike. The trench contains a reservoir pipe that is sloped to convey water to four manholes positioned along its length. The manholes are equipped with submersible pumps that operate via level controls to pump the accumulated water back into the Basin. A 30-inch thick clay slurry wall is installed along the northwestern, southwestern, and southeastern sides of Basin 1 to mitigate water seepage through the earthen dike. The slurry wall keys into the weathered shale to limit seepage through the dike. In addition, there is a grouted section of the weathered bedrock below the slurry wall on the south side of the Basin to further limit seepage through the dike. A site layout plan is provided in Figure 2. Groundwater quality is monitored at Basin 1 in accordance with state Residual Waste Permit # issued by the Pennsylvania Department of Environmental Protection. Wells associated with the permit are sampled quarterly. Findings are summarized into a quarterly report submitted to the state GWMCA Report, B1 January 2018 Rev. July 2018

5 2.2 GEOLOGIC SETTING Investigations at the site indicate that naturally occurring, unconsolidated materials below Basin 1 and in the surrounding area consist of Quaternary-aged alluvium, terrace deposits, till, and weathered bedrock. Unconsolidated materials in the northeastern portion of Basin 1 are underlain by the Mahantango Shale formation, whereas the remainder of the site is underlain by the Marcellus Shale formation. Both shale formations are described as a thick bedded, medium-darkgray to black, very fissile mudstone. Because both formations are lithologically similar and the majority of the monitoring wells screened in bedrock are in the Marcellus formation, references to shale bedrock are denoted as Marcellus Shale to avoid confusion. Borings advanced around Basin 1 indicate fractures are more prevalent in the shallow bedrock. Because the extent of fracturing is substantially different within the Marcellus Shale depending on depth, this unit has been separated into two hydrostratigraphic units (the Fractured Marcellus and the Competent Marcellus) to account for their different hydrologic properties. The Fractured Marcellus is the shallow aquifer for the site. 2.3 HYDROGEOLOGIC SETTING Conceptual Model Prior to construction of the Basin, shallow groundwater likely flowed from the eastern upland areas, in a westward direction to the lowland areas and to Chillisquaque Creek that occurs north and west of the Basin. Construction and filling the Basin above the natural grade have produced groundwater levels within Basin 1 that are elevated above the original topography. Water levels within Basin 1 are likely controlled by the Slurry Wall and affected by the French Drain. Groundwater recharge within the Basin occurs from precipitation, infiltration from the open water in the sub-basins, and from groundwater flow from the northeast. Because the groundwater is elevated in the Basin above the original topography and water table, groundwater now flows radially away from the Basin. There is no significant horizontal hydraulic gradient within the GWMCA Report, B1 January 2018 Rev. July 2018

6 impoundment; however, the gradient within the dike and slurry wall is steep due to their low hydraulic conductivity Hydrogeologic Characteristics The hydraulic conductivity of the CCR within the Basin ranges from 9 x 10-5 cm/s to 8 x 10-3 cm/s. The average hydraulic conductivity is 2 x 10-3 cm/s. The thickness of the residual soil outside the Basin is limited and no wells were screened in this material. Therefore, no hydraulic conductivity information is available outside of literature values. The hydraulic conductivity of the fractured bedrock ranges from 2 x 10-6 cm/s to 9 x 10-3 cm/s. The average hydraulic conductivity is 2 x 10-3 cm/s. The hydraulic conductivity of the competent bedrock that underlies the shallow fractured aquifer ranges from 3 x 10-7 cm/s to 2 x 10-3 cm/s. The average hydraulic conductivity is 3 x 10-4 cm/s. Vertical hydraulic gradients in and around Basin 1 were calculated by comparing groundwater elevations from nested wells with different screen elevations. The majority of vertical gradients are near-neutral. There are a limited number of downward gradients across the study area, with the strongest occurring northeast and northwest of the Basin. The strongest upward gradient is north of the Basin GWMCA Report, B1 January 2018 Rev. July 2018

7 3.0 EXISTING MONITORING NETWORK The groundwater monitoring system consists of a thirteen wells at appropriate locations and depths to provide groundwater samples from the uppermost aquifer that accurately represent background groundwater quality and the quality of groundwater passing the waste boundary of the CCR unit. The monitoring network consists of ten existing wells and three new wells installed in April 2016 to meet the requirements of the CCR Rule. A more in-depth discussion of the monitoring network as well as the geologic and hydrologic setting is provided in the Groundwater Monitoring System Certification dated September 2017, as placed in the operating record and posted to the Talen CCR Rule website. The well locations are shown on Figure 3. The table below summarizes wells that are included as the CCR Rule Groundwater Monitoring System. Location CCR RULE GROUNDWATER MONITORING SYSTEM Relative Location Well Diameter (in.) Bottom of Screen (ftbgs) Screen Length (ft) MW-1-9 Background MPZ-21S Background MPZ-23S Downgradient MPZ-24S Downgradient MPZ-25S Downgradient MW-1-2 Downgradient MW-1-3 Downgradient MW-1-5 Downgradient MW-1-7 Downgradient MW-1-13 Downgradient MW-1-14 Downgradient MPZ-14S Downgradient PZ-21 Downgradient Upgradient locations are not available for this site because groundwater flow is radial, away from the Basin. Locations MW-1-9 and MPZ-21S are located far enough away from the Basin to not be affected by potential groundwater impacts and are used to provide background water quality data. The remaining wells, MW-1-2, MW-1-3, MW-1-5, MW-1-7, MW-1-13, MW-1-14, MPZ-14S, PZ-21, MPZ-23S, MPZ-24S, and MPZ-25S, are used as downgradient monitoring points GWMCA Report, B1 January 2018 Rev. July 2018

8 GROUNDWATER SAMPLING SUMMARY 4.1 BASELINE SAMPLING EVENT Baseline groundwater sampling was performed between May 2016 and August A total of 8 samples were collected from each of the thirteen monitoring locations, totaling 104 individual samples. These baseline samples were analyzed for both Appendix III and Appendix IV parameters. Laboratory analytical results for these sampling events are provided in Table DETECTION MONITORING EVENT The initial Detection Monitoring sampling event was performed between October 2 to 9, All thirteen locations were sampled and analyzed for Appendix III parameters. Samples were collected per the Basin 1 Groundwater Monitoring Program and submitted to Hawk Mountain Laboratory, a National Environmental Laboratory Accreditation Program (NELAP) accredited laboratory. The laboratory results were finalized on November 16, Results are provided in Table 2. A summary of 2017 sampling events is listed below. No transition between CCR Rule groundwater monitoring programs occurred in GWMCA Report, B1 January 2018 Rev. July 2018

9 Location Event No CCR RULE GROUNDWATER SAMPLING EVENTS Baseline Events Appendix III and IV DM* Event Appendix III Background Wells MW 1-9 5/18/2016 6/29/2016 8/18/ /8/2016 2/14/2017 5/10/2017 6/22/2017 8/14/ /4/2017 MPZ-21S 5/17/2016 6/28/2016 8/17/ /8/2016 2/15/2017 5/11/2017 6/22/2017 8/9/ /4/2017 Downgradient Wells MPZ-23S 5/16/2016 6/28/2016 8/15/ /7/2016 2/14/2017 5/10/2017 6/19/2017 8/9/ /3/2017 MPZ-24S 5/16/2016 6/27/2016 8/16/ /7/2016 2/14/2017 5/18/2017 6/21/2017 8/8/ /9/2017 MPZ-25S 5/16/2016 6/28/2016 8/15/ /7/2016 2/14/2017 5/11/2017 6/22/2017 8/10/ /4/2017 MW-1-2 5/16/2016 6/29/2016 8/15/ /7/2016 2/13/2017 5/8/2017 6/20/2017 8/7/ /2/2017 MW-1-3 5/17/2016 6/29/2016 8/15/ /7/2016 2/13/2017 5/8/2017 6/20/2017 8/7/ /2/2017 MW-1-5 5/17/2016 6/29/2016 8/17/ /7/2016 2/14/2017 5/10/2017 6/22/2017 8/14/ /2/2017 MW-1-7 5/18/2016 6/29/2016 8/16/ /7/2016 2/13/2017 5/9/2017 6/19/2017 8/8/ /2/2017 MW /19/2016 6/28/2016 8/16/ /8/2016 2/14/2017 5/9/2017 6/19/2017 8/9/ /3/2017 MW /19/2016 6/28/2016 8/15/ /8/2016 2/14/2017 5/8/2017 6/20/2017 8/9/ /2/2017 MPZ-14S 5/23/2016 6/27/2016 8/18/ /14/2016 2/21/2017 5/17/2017 6/21/2017 8/8/ /9/2017 PZ-21 5/23/2016 6/27/2016 8/18/ /14/2016 2/21/2017 5/17/2017 6/21/2017 8/10/ /9/2017 MPZ-23S 5/16/2016 6/28/2016 8/15/ /7/2016 2/14/2017 5/10/2017 6/19/2017 8/9/ /3/2017 MPZ-24S 5/16/2016 6/27/2016 8/16/ /7/2016 2/14/2017 5/18/2017 6/21/2017 8/8/ /9/2017 Notes Background Well Downgradient Well * DM Detection Monitoring 4.3 RECORD KEEPING REQUIREMENTS In accordance with (h) this document has been placed in Montour s Operating Record. A copy will also be placed on the publicly accessible website and a notification will be submitted to the Pennsylvania Department of Environmental Protection to comply with (h) and (h) of the CCR Rule GWMCA Report, B1 January 2018 Rev. July 2018

10 FIGURES

11 \\svr-pittsburgh\projects\2013\ \-gis\maps\task_1203\basin_1\132065_fig1_site_loc.mxd 1/4/2018 4:03 PM (nhetrick) SITE SCALE IN FEET 0 *HAND SIGNATURE ON FILE REFERENCE USGS TOPOGRAPHIC MAP/ ARCGIS MAP SERVICE: USA_TOPO_MAPS. DRAWN BY: DATE: 333 Baldwin Road - Pittsburgh, PA CBL CHECKED BY: 1/4/2018 SCALE: 4,000 8,000 GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT MONTOUR STEAM ELECTRIC STATION BJH APPROVED BY: 1 " = 4,000 ' PROJECT NO: SITE LOCATION MAP - BASIN 1 HTW* FIGURE NO:

12 East Branch of Chillisquaque Creek North Side Area E&S Pond French Drain Area MW 1-7 Area Alternate Plot Capping E&S Pond Trough Outlet Ditches Sub-Basin C Coal Pile Runoff Treatment Facility ee k Ro ad Ri dg e Cr ry E&S Pond wb er ad Ro ae l ich M cm \\svr-pittsburgh\projects\2013\ \-gis\maps\task_1203\basin_1\132065_fig2_site_layout.mxd 1/4/2018 4:03 PM (nhetrick) Sub-Basin B Bottom Ash Stockpile Area Former Temporary Gypsum Stockpile St ra Weather Station (T 37 8) Chillisquaque Creek Ro ad? Top Soil and Soil Blend Pile Area Bottom Ash Pile Sub-Basin A Mill Rejects Area Mill Rejects Trough Bottom Ash Troughs Diehl E&S Pond Strawberry Ridge Area Road West Side Area South Side Area PPL Montour Steam Electric Station REFERENCE ESRI WORLD IMAGERY / ARCGIS MAP SERVICE: ACCESSED 1/4/2018, IMAGERY DATE: SCALE IN FEET 0 LEGEND? Weather Station Approximate Extent of French Drain Approximate Splitter Dike Location Approximate Extent of Grout Curtain Approximate Extent of Basin 1 Additional Groundwater Monitoring Program Areas Approximate Extent of Slurry Wall Stream DRAWN BY: *HAND SIGNATURE ON FILE DATE: 333 Baldwin Road - Pittsburgh, PA CBL CHECKED BY: 1/4/2018 SCALE: 500 1,000 GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT MONTOUR STEAM ELECTRIC STATION BJH APPROVED BY: 1 " = 500 ' PROJECT NO: SITE LAYOUT PLAN - BASIN 1 HTW* FIGURE NO:

13 ( ( MPZ-25S MW-1-14 \\svr-pittsburgh\projects\2013\ \-gis\maps\task_1203\basin_1\132065_fig3_fed_ccr_rule.mxd 1/15/2018 1:47 PM (nhetrick) ( ( MW-1-7 ( MW-1-2 ( ( ( MW-1-3 MPZ-21S/I ( MPZ-24S ( MW-1-13 ( MPZ-23S ( MPZ-14S/I PZ-211 MW-1-5 ( MW-1-9 SCALE IN FEET 0 LEGEND DOWNGRADIENT MONITORING POINT ( ( BACKGROUND MONITORING POINT REFERENCE ESRI WORLD IMAGERY / ARCGIS MAP SERVICE, IMAGERY DATE: ,200 GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT MONTOUR STEAM ELECTRIC STATION 333 Baldwin Road - Pittsburgh, PA FEDERAL CCR RULE - BASIN GROUNDWATER SAMPLING LOCATIONS DRAWN BY: NJH CHECKED BY: BJH APPROVED BY: HTW* FIGURE NO: signature DATE: *onhand 1/15/2018 SCALE: 1 " = 600 ' PROJECT NO: file 3

14 TABLE 1 BASELINE SAMPLING DATA

15 TABLE 1.1 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-2 MW 1-2 MW 1-2 MW 1-2 MW 1-2 MW 1-2 MW 1-2 MW 1-2 Parameter Date Collected: 5/16/2016 6/29/2016 8/15/ /7/2016 2/13/2017 5/8/2017 6/20/2017 8/7/2017 Inorganics Total Metals Antimony, Total mg/l < < < J < < < J Arsenic, Total mg/l < < < < < < < < Barium, Total mg/l Beryllium, Total mg/l < < < < J < J < Boron, Total mg/l J Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < Cobalt, Total mg/l < < < < J J < J Lead, Total mg/l < J < < J J J J Lithium, Total mg/l Mercury, Total mg/l J < J < J < < < Molybdenum, Total mg/l < < < J J J < Selenium, Total mg/l J < J J J J < J Thallium, Total mg/l < < < < J < J Non-Metals Chloride mg/l Fluoride mg/l < J 0.12 J ph S.U H 6.67 H 7.05 H 6.94 H 7.54 H 7.31 H 7.06 H 6.83 H Sulfate mg/l J Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < Field Parameters ph field reading (SM4500B) S.U NC 6.30 NC 6.34 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

16 TABLE 1.2 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-3 MW 1-3 MW 1-3 MW 1-3 MW 1-3 MW 1-3 MW 1-3 MW 1-3 Parameter Date Collected: 5/17/2016 6/29/2016 8/15/ /7/2016 2/13/2017 5/8/2017 6/20/2017 8/7/2017 Inorganics Total Metals Antimony, Total mg/l < < < J J J < J Arsenic, Total mg/l J J J < < < J < Barium, Total mg/l Beryllium, Total mg/l < < < < J < J < Boron, Total mg/l J J J < J J Cadmium, Total mg/l < < J < < < J < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < < Cobalt, Total mg/l < < < < J < < J Lead, Total mg/l < < < < J < J J Lithium, Total mg/l Mercury, Total mg/l < < J < < < < < Molybdenum, Total mg/l < < < < < < < Selenium, Total mg/l J J J J J J J < Thallium, Total mg/l < < < < < < < < Non-Metals Chloride mg/l Fluoride mg/l < J 0.12 J ph S.U H 6.78 H 6.69 H 6.42 H 6.87 H 6.73 H 6.54 H 6.31 H Sulfate mg/l J Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < Field Parameters ph field reading (SM4500B) S.U. 6.2 NC 6.17 NC 5.92 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

17 TABLE 1.3 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-5 MW 1-5 MW 1-5 MW 1-5 MW 1-5 MW 1-5 MW 1-5 MW 1-5 Parameter Date Collected: 5/17/2016 6/29/2016 8/17/ /7/2016 2/14/2017 5/10/2017 6/22/2017 8/14/2017 Inorganics Total Metals Antimony, Total mg/l < < < J < < J J Arsenic, Total mg/l Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l J 0.07 J J J J Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l S Chromium, Total mg/l < < < < < < < Cobalt, Total mg/l < < < < J J J J Lead, Total mg/l < J < < J J J J Lithium, Total mg/l Mercury, Total mg/l < < J < J < < < Molybdenum, Total mg/l J J J Selenium, Total mg/l < < < J < J J J Thallium, Total mg/l J J J < J J J Non-Metals Chloride mg/l Fluoride mg/l < ph S.U H 6.67 H 6.46 H 6.55 H 6.89 H 6.42 H 6.44 H 6.63 H Sulfate mg/l J Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < Field Parameters ph field reading (SM4500B) S.U NC 6.26 NC 6.08 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

18 TABLE 1.4 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-7 MW 1-7 MW 1-7 MW 1-7 MW 1-7 MW 1-7 MW 1-7 MW 1-7 Parameter Date Collected: 5/18/2016 6/29/2016 8/16/ /7/2016 2/13/2017 5/9/2017 6/19/2017 8/8/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < < < J Arsenic, Total mg/l < J J J < < J Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l J Cadmium, Total mg/l J J J < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < < Cobalt, Total mg/l < < < J < J Lead, Total mg/l < J < < J < J < Lithium, Total mg/l S Mercury, Total mg/l < < J < J < < < Molybdenum, Total mg/l < < < < < < < Selenium, Total mg/l < < J J J < J Thallium, Total mg/l < < < < < < < < Non-Metals Chloride mg/l Fluoride mg/l J J J < 0.04 < < J ph S.U H 6.94 H 7.77 H 7.06 H 7.31 H 7.05 H 7.06 H 6.67 H Sulfate mg/l J Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < < < Field Parameters ph field reading (SM4500B) S.U NC 6.50 NC 6.53 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

19 TABLE 1.5 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS BACKGROUND WELL Sample I.D.: MW 1-9 MW 1-9 MW 1-9 MW 1-9 MW 1-9 MW 1-9 MW 1-9 MW 1-9 Parameter Date Collected: 5/18/2016 6/29/2016 8/18/ /8/2016 2/14/2017 5/10/2017 6/22/2017 8/14/2017 Inorganics Total Metals Antimony, Total mg/l < < < J J < J J Arsenic, Total mg/l J J J J < < < < Barium, Total mg/l Beryllium, Total mg/l < < < < < < J < Boron, Total mg/l Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < Cobalt, Total mg/l < < < < J J J J Lead, Total mg/l < < < < J J J J Lithium, Total mg/l Mercury, Total mg/l < < J J J < < < Molybdenum, Total mg/l J Selenium, Total mg/l < < < J J < < J Thallium, Total mg/l < J < < < < J J Non-Metals Chloride mg/l Fluoride mg/l < ph S.U. 7.8 H 7.66 H 7.53 H 7.58 H 7.83 H 7.8 H 7.48 H 7.47 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < < < < < Field Parameters ph field reading (SM4500B) S.U NC 7.33 NC 7.08 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

20 TABLE 1.6 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-13 MW 1-13 MW 1-13 MW 1-13 MW 1-13 MW 1-13 MW 1-13 MW 1-13 Parameter Date Collected: 5/19/2016 6/28/2016 8/16/ /8/2016 2/14/2017 5/9/2017 6/19/2017 8/9/2017 Inorganics Total Metals Antimony, Total mg/l < < < < J J J Arsenic, Total mg/l < J J < < < < < Barium, Total mg/l Beryllium, Total mg/l < < < < J < < < Boron, Total mg/l J Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l S Chromium, Total mg/l < < < < < < < < Cobalt, Total mg/l < < < J J Lead, Total mg/l < < < < J J J J Lithium, Total mg/l Mercury, Total mg/l < < < < J < < < Molybdenum, Total mg/l < < < J J J J J Selenium, Total mg/l J < J J J J J J Thallium, Total mg/l < < < < < J < < Non-Metals Chloride mg/l Fluoride mg/l < 0.06 < 0.06 < 0.06 < 0.04 < < J ph S.U H 6.97 H 7.66 H 7.28 H 7.16 H 7.14 H 7.05 H 7.25 H Sulfate mg/l J Total Dissolved Solids mg/l R Combined Radium-226/228 pci/l < < 1.02 < < Field Parameters ph field reading (SM4500B) S.U NC 6.60 NC 6.54 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

21 TABLE 1.7 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MW 1-14 MW 1-14 MW 1-14 MW 1-14 MW 1-14 MW 1-14 MW 1-14 MW 1-14 Parameter Date Collected: 5/19/2016 6/28/2016 8/15/ /8/2016 2/14/2017 5/8/2017 6/20/2017 8/9/2017 Inorganics Total Metals Antimony, Total mg/l < < < < J < < J Arsenic, Total mg/l R J < Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l J Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < Cobalt, Total mg/l J J < Lead, Total mg/l J < < < J < J J Lithium, Total mg/l Mercury, Total mg/l < < < < J < < < Molybdenum, Total mg/l J J J < Selenium, Total mg/l < < < J J < < < Thallium, Total mg/l < J < < < < < < Non-Metals Chloride mg/l Fluoride mg/l < 0.04 < J 0.12 J 0.1 J ph S.U H 7.26 H 7.14 H 7.48 H 7.38 H 7.22 H 6.76 H 6.95 H Sulfate mg/l J Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < < Field Parameters ph field reading (SM4500B) S.U NC 6.54 NC 6.66 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

22 TABLE 1.8 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MPZ-14S MPZ-14S MPZ-14S MPZ-14S MPZ-14S MPZ-14S MPZ-14S MPZ-14S Parameter Date Collected: 5/23/2016 6/27/2016 8/18/ /14/2016 2/21/2017 5/17/2017 6/21/2017 8/8/2017 Inorganics Total Metals Antimony, Total mg/l J J J < J J < J Arsenic, Total mg/l J J Barium, Total mg/l Beryllium, Total mg/l < < < < < < J < Boron, Total mg/l J J Cadmium, Total mg/l J J J J J < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < < Cobalt, Total mg/l J J J < J J < J Lead, Total mg/l J J J J J J J Lithium, Total mg/l Mercury, Total mg/l < J < < < < < < Molybdenum, Total mg/l J J Selenium, Total mg/l < < < < < J < < Thallium, Total mg/l < J < < J J < < Non-Metals Chloride mg/l Fluoride mg/l J J 0.16 J 0.16 J ph S.U H 7.24 H 7.36 H 7.14 H 7.32 H 7.33 H 7.06 H 7 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < < Field Parameters ph field reading (SM4500B) S.U. 7.2 NC 6.95 NC 7 NC 7.15 NC 7.32 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

23 TABLE 1.9 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS BACKGROUND WELL Sample I.D.: MPZ-21S MPZ-21S MPZ-21S MPZ-21S MPZ-21S MPZ-21S MPZ-21S MPZ-21S Parameter Date Collected: 5/17/2016 6/28/2016 8/17/ /08/2016 2/15/2017 5/11/2017 6/22/2017 8/9/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < < < < Arsenic, Total mg/l < < < < < < < J Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < J Cobalt, Total mg/l < < < < < J J J Lead, Total mg/l J J J < J J J < Lithium, Total mg/l Mercury, Total mg/l J < < J J < < < Molybdenum, Total mg/l < < < < < < < Selenium, Total mg/l J < < < J J < < Thallium, Total mg/l J < < < J J < < Non-Metals Chloride mg/l Fluoride mg/l ph S.U H 7.75 H 7.65 H 7.69 H 7.68 H 7.72 H 7.58 H 7.61 H Sulfate mg/l J J < Total Dissolved Solids mg/l Combined Radium-226/228 pci/l Field Parameters ph field reading (SM4500B) S.U NC 7.40 NC 7.19 NC 7.37 NC 7.38 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

24 TABLE 1.10 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MPZ-23S MPZ-23S MPZ-23S MPZ-23S MPZ-23S MPZ-23S MPZ-23S MPZ-23S Parameter Date Collected: 5/16/2016 6/28/2016 8/15/ /07/2016 2/14/2017 5/10/2017 6/19/2017 8/9/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < < < < Arsenic, Total mg/l Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l Cadmium, Total mg/l J < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < < < Cobalt, Total mg/l Lead, Total mg/l < < J < < < J J Lithium, Total mg/l Mercury, Total mg/l < < < < < < < < Molybdenum, Total mg/l < < < < < Selenium, Total mg/l J J J J J J J J Thallium, Total mg/l < < < < J < J < Non-Metals Chloride mg/l Fluoride mg/l < 0.04 < 0.05 < J < < J ph S.U H 6.5 H 6.89 H 6.69 H 6.51 H 6.41 H 6.51 H 6.83 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < < < Field Parameters ph field reading (SM4500B) S.U NC 5.85 NC 6.07 NC 6.04 NC 5.8 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

25 TABLE 1.11 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MPZ-24S MPZ-24S MPZ-24S MPZ-24S MPZ-24S MPZ-24S MPZ-24S MPZ-24S Parameter Date Collected: 5/16/2016 6/27/2016 8/16/ /07/2016 2/14/2017 5/18/2017 6/21/2017 8/8/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < < < < Arsenic, Total mg/l J Barium, Total mg/l Beryllium, Total mg/l < < < < < < J < Boron, Total mg/l Cadmium, Total mg/l < < < < < < < < Calcium, Total mg/l Chromium, Total mg/l < < < < < < Cobalt, Total mg/l J J J J < < J Lead, Total mg/l J J < J J J J Lithium, Total mg/l Mercury, Total mg/l < < < < < < < < Molybdenum, Total mg/l J J J J J Selenium, Total mg/l J < J < J J J J Thallium, Total mg/l < < < < < < < < Non-Metals Chloride mg/l Fluoride mg/l J J J J 0.17 J 0.15 J 0.14 J ph S.U H 7.07 H 6.93 H 7.62 H 7.55 H 7.16 H 6.92 H 6.75 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l Field Parameters ph field reading (SM4500B) S.U NC 6.83 NC 6.42 NC 6.81 NC 6.92 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

26 TABLE 1.12 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: MPZ-25S MPZ-25S MPZ-25S MPZ-25S MPZ-25S MPZ-25S MPZ-25S MPZ-25S Parameter Date Collected: 5/16/2016 6/28/2016 8/15/ /07/2016 2/14/2017 5/11/2017 6/22/2017 8/10/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < < < < Arsenic, Total mg/l J J J J J < < Barium, Total mg/l Beryllium, Total mg/l < < < < < < < < Boron, Total mg/l J Cadmium, Total mg/l < J J Calcium, Total mg/l Chromium, Total mg/l < < < < < < J Cobalt, Total mg/l < < < < < J J J Lead, Total mg/l J < J < J J J J Lithium, Total mg/l J J J J J J J J Mercury, Total mg/l < < J < J < < < Molybdenum, Total mg/l < < < < < < < J Selenium, Total mg/l J J J < < < Thallium, Total mg/l < < < < < < < < Non-Metals Chloride mg/l Fluoride mg/l J J 0.13 J ph S.U H 6.16 H 6.03 H 5.94 H 6.44 H 6.49 H 6.27 H 6.28 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l < < Field Parameters ph field reading (SM4500B) S.U NC 5.81 NC 5.62 NC 5.69 NC 5.62 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised

27 TABLE 1.13 FEDERAL CCR RULE SUMMARY ASH DISPOSAL BASIN 1 BASELINE SAMPLING EVENTS DOWNGRADIENT WELL Sample I.D.: PZ-21 PZ-21 PZ-21 PZ-21 PZ-21 PZ-21 PZ-21 PZ-21 Parameter Date Collected: 5/23/2016 6/27/2016 8/18/ /14/2016 2/21/2017 5/17/2017 6/21/2017 8/10/2017 Inorganics Total Metals Antimony, Total mg/l < < < < < J < J Arsenic, Total mg/l J < J Barium, Total mg/l Beryllium, Total mg/l < < < < < J < J Boron, Total mg/l Cadmium, Total mg/l < Calcium, Total mg/l Chromium, Total mg/l < < < < < < J < Cobalt, Total mg/l < < < < < J J Lead, Total mg/l Lithium, Total mg/l Mercury, Total mg/l < J < J J < < < Molybdenum, Total mg/l < < < < < J < Selenium, Total mg/l J J < J J J J J Thallium, Total mg/l < < < < < < < < Non-Metals Chloride mg/l Fluoride mg/l J J J J J 0.17 J 0.11 J 0.15 J ph S.U H 6.78 H 7 H 6.78 H 6.81 H 6.65 H 6.63 H 6.79 H Sulfate mg/l Total Dissolved Solids mg/l Combined Radium-226/228 pci/l Field Parameters ph field reading (SM4500B) S.U NC 6.67 NC 6.7 NC 7.03 NC 6.96 NC Notes: Bolded values were detected at concentrations above laboratory reporting limits. -- Denotes parameter not run and/or sample not collected H - Holding time for preparation or analysis exceeded; the recommend holding time for ph is 15 minutes in the field or as soon as possible for laboratory analysis J - Analyte detected below the Quantitation Limit, the reported value is an estimate NC- Analyte not certified in NELAC Scope of Accreditation Appendix III Parameters Appendix IV Parameters Revised