2017 ANNUAL GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT COAL COMBUSTION RESIDUE (CCR) LANDFILL PERMIT NO. #70-SDP-06-82P

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1 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water 2017 ANNUAL GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT COAL COMBUSTION RESIDUE (CCR) LANDFILL PERMIT NO. #70-SDP-06-82P MUSCATINE POWER & WATER MUSCATINE, IOWA January 2018 OWNERSHIP OF DOCUMENT This document, and the ideas and designs incorporated herein, as an instrument of professional service, is the property of HR Green, Inc. and is not to be used, in whole or in part, for any other project without the written authorization of HR Green, Inc. J:\2017\ \Design\GMR 2017\Rpt MPW-2017AnnualGMCAR-Final.docx

2 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water CERTIFICATION 2017 ANNUAL GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT CCR LANDFILL Permit No. #70-SDP-06-82P MUSCATINE POWER & WATER MUSCATINE, IOWA January 2018 I hereby certify that this engineering document was prepared by me or under my direct personal supervision and that I am a duly licensed Professional Engineer under the laws of the State of Iowa. Date: 1/15/18 Jon E. Scharf, P.E. License No My renewal date is December 31, 2018 Pages or sheets covered by this seal: ENTIRE DOCUMENT Prepared By: Name: Gregory J. Brennan, P.HG., P.G. Certified Professional Hydrogeologist Licensed Professional Geologist Signature: Date: 1/15/18 HR Green, Inc Earhart Lane SW Cedar Rapids, IA Phone: (319) ; Fax: (319)

3 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water TABLE OF CONTENTS Page No. I. GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT... I-1 A. LOCATION AND SITE MAPS (e)(1)... I-1 B. IDENTIFICATION OF WELLS (e)(2)... I-1 C. SUMMARY OF SAMPLE COLLECTION AND ANALYSIS (e)(3) I-2 D. DISCUSSION OF FINDINGS (e)(4)... I-3 E. SUPPLEMENTAL INFORMATION (e)(5)... I-4 II. REFERENCES... II-1 APPENDIX A APPENDIX B APPENDIX C APPENDIX D FIGURES Figure 1 Location Map Figure 2 Site Map 2017 TABLES Table 1 Summary of Monitoring Wells and Piezometers Table 2 Implementation Schedule Table 3 Groundwater Monitoring Program Summary Table 4 CCR Landfill s Leachate Composition April 2017 SAMPLING DATA Summary Tabulations of Analytical Results October 16, 2017 First Detection Monitoring Event Documentation o Laboratory Analytical Report o Low Flow Sampling Forms o Groundwater Sampling Forms November 28, 2017 First Resampling Event Documentation o Laboratory Analytical Report o Low Flow Sampling Forms o Groundwater Sampling Forms STATISTICAL RESULTS Statistical Results Report, November 15, 2017 First Detection Monitoring Event Statistical Results Report, December 19, 2017 First Resampling Event Flow Charts showing statistical procedure methodologies

4 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water I. GROUNDWATER MONITORING AND CORRECTIVE ACTION REPORT Under Federal CCR Rule 40 CFR Part Groundwater Monitoring and Corrective Action Muscatine Power and Water (MP&W) as the owner of an existing coal combustion residue (CCR) landfill must prepare, no later than January 31, 2018, and annually thereafter, an Annual Groundwater Monitoring And Corrective Action Report. The report must, for the preceding calendar year, 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. The prepared annual report must be placed in the facility s operating record as required under Part (h)(1). The following sections cover the annual report s content requirements under Part (e) for calendar year A. LOCATION AND SITE MAPS (e)(1) MP&W maintains a private CCR landfill that provides for the controlled disposal of CCR originating at its power generating facility located at 1700 Dick Drake Way in Muscatine. The approximate 80 acre landfill site is located 7.5 miles west of the power plant in the SW¼ of Section 16, Township 76 North, Range 3 West in Muscatine County (Figure 1, Appendix A). The landfill has been in continuous operation since The CCR includes a mixture of gypsum, fly ash, bottom ash, and slag. The permitted disposal area is approximately 34 acres which is being developed in four phases, where the cells are constructed and filled in sequential order from east to west. Currently Phases I and II are open and are actively being filled with CCR (Figure 2, Appendix A). The site is regulated by the Iowa Department of Natural Resources (IDNR) under [567] Iowa Administrative Code (IAC) Chapter 103 and by state Sanitary Disposal Project Permit #70-SDP-06-82P, issued August 9, 2010 with an expiration date of August 9, 2020, and subsequent Permit Amendment Nos. 1 through 9. A comprehensive list of references for this facility is provided in Section II. Of primary interest herein is: Groundwater Monitoring System and Sampling and Analysis Program, CCR Landfill (HR Green, revised May 2, 2017, original May 18, 2016). That document addresses the groundwater monitoring and corrective action requirements of the Federal CCR Rule Part and is posted as a reference on MP&W s publicly accessible Internet site at B. IDENTIFICATION OF WELLS (e)(2) Table 1 provides a summary of the existing groundwater monitoring wells (Appendix B). I-1

5 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water There were no new monitoring wells installed during One new well, MW-22 is proposed for installation in This well will allow monitoring of groundwater near the southwest entrance of the landfill. This well is discussed in Section I.E below. Well MW-17 was decommissioned on December 11, The well was used exclusively for water level measurements. The well was plugged and abandoned under direction of the Iowa DNR due to damaged casing at approximately 4.5 feet deep which prevented access to the well. Proper documentation was submitted to the Iowa DNR on its standard form # C. SUMMARY OF SAMPLE COLLECTION AND ANALYSIS (e)(3) Sample Collection and Results Under 40 CFR Part (a) the Groundwater Monitoring Program (GMP) includes the following groundwater monitoring points: Upgradient wells: MW-8 and MW-10 used to establish background quality; and Downgradient wells: MW- 4A, MW-5B, MW-6A, MW-13, MW-14A, MW-15A, MW-18A, and MW-21 to monitor for downgradient impacts. Table 1 provides a summary of the groundwater monitoring points (Appendix B), including: (1) Location coordinates (see also Figure 2), (2) Construction details, (3) Function as a monitoring well or level measuring point, (4) Hydrogeologic unit monitored, and (5) Recent water level measurement used for the current evaluation of horizontal groundwater flow pattern and vertical gradients. The monitoring wells are sampled for the constituents specified in Appendix III and Appendix IV to Part 257, as follows: Appendix III: boron, calcium, chloride, fluoride, ph, sulfates, and total dissolved solids. Appendix IV: antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, fluoride, lead, lithium, mercury, molybdenum, selenium, thallium, and radium 226 & 228 combined. Table 2 provides the implementation schedule for the GMP (Appendix B), consisting of: (1) Well function as either a upgradient or downgradient monitoring point (2) Number of samples collected in each monitoring program, (3) Dates of completed sampling events and constituents tested, including: I-2

6 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water a. Establish background quality, b. Detection monitoring, c. Resampling events to verify initial SSI, d. Assessment monitoring, and e. Corrective action monitoring. Samples are collected and handled as described in Procedure for Groundwater and Surface Water Sampling (HR Green, May 2016, updated June 2017). A tabulation of the groundwater sampling data obtained under through is provided. This tabulation covers the period of June 2016 through December 2017, including the initial 8 events used to establish background quality, the first detection (compliance) event, and the first resampling event (Appendix C). The laboratory s analytical reports, and field low-flow sampling forms, and the DNR Sampling Forms are also provided for the two events evaluated herein, including the first detection (compliance) event and the first resampling event (Appendix C). A full copy of all sampling documentation and laboratory analytical reports for the background events is filed in the landfill s operating record and is available for review upon request to MP&W. A full copy is not included herein due to its overall length (~800 pages). Analysis The collected groundwater samples were analyzed by certified testing laboratory TestAmerica Laboratories, Inc. The analyzed data were then used to calculate statistical limits for each well/constituent pair (e.g., MW-21/boron). Statistical calculations were performed by Groundwater Stats Consulting using industry standard SANITAS Statistical Software, an EPA-compliant package (EPA 2009, Unified Guidance). The full procedure is as detailed in the document entitled: Groundwater Monitoring System and Sampling and Analysis Program, CCR Landfill (HR Green, revised May 2, 2017, original May 18, 2016). Event-specific reports by summarizing the statistical analyses completed in 2017 are provided for reference (Appendix D) and discussed below. D. DISCUSSION OF FINDINGS (e)(4) The establishment of baseline water quality, detection monitoring, and the present transition from detection monitoring to assessment monitoring is being conducted in accordance with the statistical analysis methodologies originally presented in Groundwater Monitoring System and Sampling and Analysis Program, CCR Landfill (HR Green, May 2017), and which are also provided herein for quick reference (Tables III-4, III-6, III-8, and III-9 in Appendix D). I-3

7 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Following the establishment of background water quality during the period of June 2016 through August 2017 (8 sampling events), the detection monitoring program was initiated in October The October 16, 2017 event was the first detection monitoring event, meaning Appendix III parameters were tested (see Table 2). For that event an initial 22 well/constituent pairs were determined to exceed their respective statistical limits, which are called initial SSI or statistically significant increase above background concentration (Table 2, resampling column). The statistical analysis is presented in the report by Groundwater Stats Consulting dated November 15, 2017, where the summary table on page 6 of that report shows the 22 initial SSI results (Appendix D), corresponding to Table 2. Procedure then required a resampling event for those 22 well/constituent pairs, which was conducted on November 28, 2017 to confirm that each is in fact an SSI and not a false positive. Based on re-sampling and statistical analysis there were 3 false positives (calcium, sulfate, and total dissolved solids at MW-13) and 19 confirmed SSI (Table 3, confirmed SSI column). The statistical analysis is presented in full in the report by Groundwater Stats Consulting dated December 19, 2017, where the summary table on page 4 of that report shows the confirmed SSI results (Appendix D), corresponding with Table 3. The 19 confirmed SSI lead the facility into assessment monitoring where Appendix III & IV constituents will be tested during 2018, as shown in Table 3. The first event in 2018 is tentatively scheduled for March. This event is intended to satisfy the requirements of both the routine semi-annual event and the first assessment event. The fall semi-annual event will be September. Other resampling events and/or assessment events may be scheduled based on findings. Table 3 provides a groundwater monitoring program summary (Appendix B), including: (1) The current monitoring program status, (2) Planned change in monitoring program status for the next sampling event, (3) Confirmed statistically significant increases (SSI) over background, (4) Statistically significant trends, (5) Statistically significant level (SSL) over a groundwater protection standard, and (6) Upcoming sampling dates and constituents (as best as can be determined at this point in time). E. SUPPLEMENTAL INFORMATION (e)(5) The following information is provided to fill in context for the MP&W CCR facility. I-4

8 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Monitored Hydrogeologic Unit For a full discussion of the GMP reference the document Groundwater Monitoring System and Sampling and Analysis Program, CCR Landfill (HR Green, Revised May 2, 2017, original May 18, 2016). Of particular relevance herein is that the GMP wells monitor (1) water levels to determine horizontal and vertical groundwater flow paths, and (2) for downgradient groundwater quality impacts to the uppermost continuous aquifer beneath the site. The aquifer and gradients are discussed below. Uppermost Continuous Aquifer: As a whole, a deep un-weathered and un-oxidized clay-rich glacial till functions as a lower confining unit with field hydraulic conductivity values of less than 1 x 10-7 cm/sec. Over most of the site, this underlying low permeability glacial till confining unit is overlain by a sequence of weathered oxidized till, sand, and clayey silt (loess) which collectively constitute the uppermost continuous aquifer beneath the site. This aquifer exhibits hydraulic conductivity values as great as 1.7 X 10-4 cm/sec and which are two to three orders of magnitude greater than the underlying confining unit. Therefore, the assemblage of deposits generally at depths of less than 50 feet is interpreted to function as the uppermost continuous aquifer beneath the landfill. This is also the unit, within which the water table fluctuates, which means the uppermost continuous aquifer is one in the same hydrogeologic unit as the shallow water table aquifer. This uppermost continuous aquifer is the unit monitored by the HMSP groundwater monitoring wells. Groundwater Flow: The pre-landfill groundwater flow direction in the uppermost aquifer was dominantly horizontal from the east/southeast toward the west/northwest with natural convergence along an ephemeral stream that formally drained the undeveloped site. Under current conditions the dominant flow direction remains the same except that convergence is now to the runoff control pond located west of the landfill, which has replaced the original stream. In addition, there is an apparent radial flow component caused by the constructed groundwater cutoff drains along the east and south perimeters, and by the landfill bypass ditch north of the fill area, and due to the apparent presence of some liquid within the original CCR (see Figure 2). The water table contours on Figure 2 were generated using April 2017 water level data. The steep gradient in the southeast corner of the landfill is a product of landfill construction, where the cell was cut steeply into the pre-existing topographic ridge thus creating a lateral flow discontinuity between the CCR and native glacial till interface. I-5

9 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water The observed vertical flow components are recharge (downward) in the upland area of the southeast corner of the site (MW-8/9) and discharge (upward) in the lowland area along the drainage way in the northeast corner of the site (MW-10/11) (see Table 1). State Monitoring Requirements Monitoring is conducted per the DNR-approved Hydrologic Monitoring System Plan (HMSP). An updated HMSP is being proposed in in the January 2018 annual report, where the update is needed because of (1) low flow purging and sampling methodologies that have been implemented in order to test total recoverable metals, (2) the addition of proposed assessment well MW-22, and (3) to establish a statistically reliable background data set. Assessment well MW-22 is being proposed because of continuing detections at MW-21 of boron and sulfate above their respective regulatory standards. MW-22 is proposed to determine if the boron and sulfate are limited to localized bank storage near the edge of the sediment run-off pond, or if migration beyond the by-pass ditch to the property line has occurred. Under Iowa DNR the approved Hydrologic Monitoring System Plan for groundwater monitoring is the same as the Federal CCR Rule in relation to monitoring wells. However, the constituent list is different because the state s requirements are from Iowa Administrative Code Chapter 103.1(2)f, the operating permit, and Permit Amendment #6, which includes arsenic, barium, beryllium, cobalt, copper, iron, lead, magnesium, manganese, selenium, zinc, chloride, sulfate, aluminum, calcium, boron, fluoride, molybdenum, nickel, strontium, and vanadium (as total metals). The state also requires testing of five (5) surface water points for the same parameters. The evaluation for the state is conducted in relation to regulatory standards (i.e., established MCL, or HAL, or Statewide Standards for a protected groundwater source). No statistical evaluation is currently required. The state s monitoring and analysis requirements are not addressed further herein but can be found in the Annual Water Quality Report to Iowa DNR (submitted to DNR annually in January). Regulatory Status The site is regulated by the Iowa Department of Natural Resources (IDNR) under [567] Iowa Administrative Code (IAC) Chapter 103 and by state Sanitary Disposal Project Permit #70-SDP-06-82P, issued August 9, 2010 with an expiration date of August 9, 2020, with subsequent Permit Amendments 1 through 9 incorporated, including: Amendment Date Purpose #1 03/23/11 - Incorporate Plugging Record for MW-16. #2 02/13/12 - Incorporate field tile slope drain extension Authorization to construct Phase II expansion. #3 05/08/12 - Incorporate Plugging Records for MW-15, MW-18, MW-19, and MW-20. I-6

10 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water - Work plan requirement to replace these wells. #4 10/24/12 - Incorporate Construction Documentation Report for Phase II Development. - Authorization to place CCR in Phase II area. - Incorporate Plugging Record for MW Incorporate construction documentation for MW-14A, MW-15A, and MW-18A. - Revise Permit Special Provision #3a pertaining to the HMSP. Unnumbered 05/22/13 - Deleting the requirement for submittal of a Semiannual Water Quality Report to DNR. #5 07/29/13 - Incorporate the Updated HMSP. #6 09/04/15 - Revise Permit Special Provision #3d relating to constituent monitoring requirements. - Revise Permit Special Provision #3e relating to Method Detection Limits. #7 04/19/16 - Re-designates MW-21 as a downgradient groundwater monitoring point. #8 08/22/16 - Incorporate construction documentation for replacement CCR piezometers PZ-1 PZ-4. #9 10/14/16 - Removes the requirement to filter groundwater samples and analyze as dissolved metals. Special Provision #3f is removed from the permit. - Allows final cover to be comprised of an 18 thick compacted clay layer overlain by a 1 thick uncompacted vegetation soil layer. - Sets January 31 as the State s Annual Water Quality Report (AWQR) submittal date. The following variances have also been issued: Variance Date Purpose #1 01/25/93 - From having a certified landfill operator on duty during all hours of operation. #2 07/08/94 - From methane monitoring and reporting requirements incorporated in Permit X.2.j. #3 10/14/16 - From sample filtration and dissolved metals analysis (IAC 103.1(2)f) - From a 2 thick compacted clay layer in the site s final cover (IAC 103.1(5)b). An 18 compacted clay layer is approved; the 1 thick un-compacted vegetation layer is still required. N/A 11/16/16 - In an DNR granted a request that MP&W does not need to conduct slug testing of HMSP monitoring wells. The following list is milestone development, plans, specifications, and reports. STATE Title 11/01/91 - Closure/Post Closure Plan. Original date 11/01/91, revised January 1996 and December /21/91 - Supporting Documentation Plans and Specifications (DOPS). 01/29/93 - Supplemental Plan Sheet 16. Various - Supplemental information dated 10/02/08, 12/17/09, and 03/30/10. 1/17/12 - CCR Landfill Cell Development Phase II 01/15/ Annual Water Quality Report - Groundwater and Surface Water Monitoring and Leachate Control System Performance Evaluation FEDERAL 10/19/15 - CCR Fugitive Dust Prevention and Control Plan 05/18/16 - Groundwater Monitoring System and Sampling and Analysis Program 10/17/16 - Run-on and Run-off Control System Plan 10/17/16 - Closure and Post-Closure Plan 12/19/17 - Annual CCR Fugitive Dust Control Report 12/23/17 - Annual Inspection Report 01/15/ Annual Groundwater Monitoring and Corrective Action Report (this document) The IDNR also regulates the site under the National Pollution Discharge Elimination System NPDES Permit # which is currently in process of permit renewal. MP&W is authorized to discharge storm water runoff from the sediment runoff pond and two groundwater cut-off drains. Quarterly monitoring of the designated Farm Pond outfall and annual reporting are completed by I-7

11 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water MP&W in accordance with this permit. Leachate Collection System The landfill s leachate collection system is located in the active Phase I and Phase II areas of the landfill (see Figure 2). The system consists of three northsouth perforated leachate pipes, each over 800 feet long, that tie into an eastwest leachate header line located at the north end of Phase II. Two of the perforated pipes are located under a portion of the Phase I development, while the third is located under the Phase II development. The header line is also paralleled by a perforated leachate line which captures leachate from the northern Phase I fill area. All collected leachate gravity drains into Lift Station A located along the haul road north of the runoff containment pond. The original Phase I area consists of 6 diameter Schedule 80 perforated leachate pipe that was trenched into the native low permeability landfill base (clay till), backfilled with pea gravel, and covered by geotextile fabric and a sand berm (GES, 1991). The more recent Phase II area consists of a 2 percent sloped, low permeability clay liner, with an overlying porous aggregate drainage layer, draining to a 6 diameter HDPE SDR11 perforated leachate pipe (HR Green, August 2012). The leachate collected in Lift Station A is pumped overland via discharge hose to the sediment runoff control pond. The pump operates continuously and, based on the pump s nameplate information, the rate is 434 gallons per hour for an estimated pumped volume of 3,800,000 gallons per year (MP&W, Per. Com. 11/2/17). This corresponds to the visually observed discharge from the end of the hose, which resembles a garden hose running at about 7 gpm. MP&W has a spare leachate pump on hand and has entered the make and model number of the leachate pump into the supply management system, which are steps taken to ensure a new leachate pump is immediately available should a future pump failure occur. The natural (pre-landfill) groundwater flow pattern crossed the site from the eastsoutheast to the west-northwest. Conditions for this original flow pattern remain albeit modified by landfill development, specifically arising from the presence of the groundwater cut-off drains along the east and south perimeters. The cut-off drains appear to capture dominantly groundwater but there is a possibility of intermittent influence of leachate as well. Table 4 provides a summary of the landfill s leachate composition, which was determined proactively by MP&W in April Five existing CCR piezometers and one leachate collection manhole were tested for a comprehensive list of constituents. The list does not exactly match the federal Appendices III and IV but nonetheless provides a useful assessment benchmark. This information will be used more extensively during the evaluation of assessment monitoring data. I-8

12 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water II. REFERENCES CITED Green Environmental Services (GES), November 21, Coal Combustion Residue Landfill Development Plans and Supporting Documentation, Muscatine Power and Water; and Supplemental Plan Sheets 16 and 18 dated January 29, Green Environmental Services (GES), October 25, Hydrogeologic Evaluation of the Muscatine Power and Water Coal Combustion Residue Landfill. Green Environmental Services (GES), June, Hydrogeologic Evaluation Work Plan for the Muscatine Power and Water Coal Combustion Residue Landfill. Groundwater Stats Consulting, December 19, Summary of statistical analysis used to evaluate the first resampling monitoring event conducted November 28, Groundwater Stats Consulting, November 15, Summary of statistical analysis used to evaluate the first detection monitoring event conducted October 16, Groundwater Stats Consulting, October 3, Summary of statistical analysis used to establish baseline water quality. Includes the analysis of eight sample events conducted from June 2016 through August HR Green, May Groundwater Monitoring System and Sampling and Analysis Program, CCR Landfill (revised May 2, 2017, original May 18, 2016). HR Green, June Procedure for Groundwater and Surface Water Sampling (original May 1993 with various updates). HR Green, Annual Water Quality Reports, addressing State of Iowa requirements. HR Green, December Annual Inspection Report, Muscatine Power & Water, CCR Landfill. HR Green, December Annual CCR Fugitive Dust Control Report, Muscatine Power & Water, CCR Landfill. HR Green, October 17, Closure and Post-Closure Plan, Muscatine Power & Water, CCR Landfill. HR Green, October 17, Run-On and Run-Off Control System Plan, Muscatine Power & Water, CCR Landfill. HR Green, December October 19, Muscatine Power & Water, CCR Landfill. CCR Fugitive Dust Prevention and Control Plan, HR Green, January 17, CCR Landfill Cell Development Phase II Expansion Plans, Muscatine Power and Water. II-1

13 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Iowa Administrative Code [567], Chapter 103 Sanitary Landfills: Coal Combustion Residue. Iowa Department of Natural Resources (IDNR) Landfill Operating Permit No. 70-SDP-06-82P dated August 9, 2010 and Permit Amendments Nos. 1-9 and an unnumbered Permit Amendment, Muscatine Power and Water. Muscatine Power and Water. Federal CCR Rule Compliance Data and Information, publicly accessible Internet site at Muscatine Power and Water, November 25, Annual Groundwater and Surface Water Monitoring Report and Leachate Collection System Performance Evaluation Report. Muscatine Power and Water, October 2, 2008, December 17, 2009, and March 30, Supplemental Information relating to landfill development. U.S. Environmental Protection Agency (EPA), March Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Unified Guidance. Office of Resource Conservation and Recovery Program Implementation and Information Division, U.S. EPA, Washington, DC. U.S. Environmental Protection Agency (EPA), Published in Federal Register Volume 80, No. 74 published on April 17, 2015, Final Rule 40 CFR Part 257 Hazardous and Solid Waste Management System; Disposal of Coal Combustion Residuals From Electric Utilities; and Technical Amendments (correcting the effective date) published in Federal Register Volume 80, No. 127 on July 2, II-2

14 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water APPENDIX A FIGURES Figure 1: Location Map Figure 2: Site Map 2017

15 Figure Miles LOCATION MAP CCR Landfill Muscatine Power and Water MP&W CCR LANDFILL Legend Property Line (Approx.) Copyright: 2013 National Geographic Society, i-cubed Permitted Fill Area Feet Projected Coordinate System: NAD 1983 StatePlane Iowa_South Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community PLOT: 12/12/2017 FILE: O:\ \GIS\Figure1-LocationMap-MP&Wlandfill.mxd

16 Figure 2 SITE MAP 740 CCR Landfill Muscatine Power and Water BY PA SS D 730 ITC H 720! A!! A 740 PHASE I SW25! H! H PZ-2 PZ Lift Station "A" SW22 715! A MW H IT C D SS YP A MW-18A PHASE II Water Supply Well Leachate Collection System Groundwater Cut-Off Drain Permitted Fill Area Phase Boundaries 730 Property Line (Approx.) GROUNDWATER 735 CUTOFF DRAIN 730! A ) " Landfill Piezometers Water Table (04/17/17) MW-14A! H 720 PHASE I B 710 Surface Water Points! H PZ-3 PHASE III (FUTURE) # * PZ-5! A PHASE IV (FUTURE) Monitoring Wells 730! H 720! A MW-10 MW-11 MW-12 # * # * Legend 730 Proposed Assessment Well! H SEDIMENT RUNOFF POND! A MW-21 MW-15A! A SIPHON OUTLET ) " Water Supply Well 740 OFFICE ! A! A MW-5B MW-6A 730 MW-4A! A! A # *MW SW # * SW ! A! MW-9 MW Feet SW26 located on bank at the south end of pond. 740 Projected Coordinate System: NAD 1983 StatePlane Iowa_South FILE: O:\ \GIS\Figure2-SiteMap-MP&Wlandfill.mxd 730 PLOT: 1/2/2018 Proposed MW-22 PZ-4

17 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water APPENDIX B TABLES Table 1 Summary of Monitoring Wells and Piezometers Table 2 Implementation Schedule Table 3 Groundwater Monitoring Program Summary Table 4 CCR Landfill s Leachate Composition April 2017

18 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Table 1 Summary of Monitoring Wells and Piezometers 2017 Groundwater Monitoring and Corrective Action Report Muscatine Power & Water CCR Landfill Permit No. #70-SDP-06-82P WELL COORDINATES (1) WELL CONSTRUCTION (4) WATER LEVELS Site System (2) State Plane (3) Elevation (Feet, amsl) (6) Hydrogeologic Well Screen Screened Unit Well ID Northing Easting Northing Easting Ground Depth Length Lithology Function Low High Top of Well Casing Vertical Gradient April 2017 (7) 4/17/2017 PZ-1 11,209 3, ,728 2,269, CCR Piezometer CCR N/A PZ-2 11,208 3, ,736 2,269, CCR Piezometer CCR N/A PZ-3 10,851 3, ,377 2,269, CCR Piezometer CCR N/A PZ-4 10,434 3, ,967 2,269, CCR Piezometer CCR N/A PZ-5 10,970 3, ,495 2,269, CCR Piezometer CCR DRY DRY N/A DRY MW-4A 9,964 2, ,481 2,268, Clay, Silt Monitoring Uppermost Aquifer N/A MW-5B 9,969 2, ,485 2,268, Silt, Clay Monitoring Uppermost Aquifer N/A MW-6A 9,966 2, ,482 2,268, Silt, Sand Monitoring Uppermost Aquifer N/A MW-8 10,103 3, ,639 2,270, Till Monitoring Uppermost Aquifer MW-9 10,110 3, ,646 2,270, Till Piezometer Uppermost Aquifer N/A MW-10 11,312 3, ,846 2,270, Silt, Till Monitoring Uppermost Aquifer MW-11 11,306 3, ,840 2,270, Till, Sand Piezometer Uppermost Aquifer MW-12 11,299 3, ,833 2,270, Till Piezometer Lower Confining Unit N/A MW-13 10,962 2, ,481 2,269, Silt, Till, Sand Monitoring Uppermost Aquifer N/A MW-14A 10,500 2, ,035 2,269, Silt, Till, Clay Monitoring Uppermost Aquifer N/A MW-15A 10,230 2, ,748 2,269, Silt, Clay Monitoring Uppermost Aquifer N/A MW-18A 10,790 2, ,304 2,269, Clay, Silt Monitoring Uppermost Aquifer N/A MW-21 10,280 2, ,779 2,268, Silt, Clay Monitoring Uppermost Aquifer N/A (1) The SW corner of T77N, R3W, Sec 16 (intersection Independence Ave. & 250th St.) is common coordinate: Site System (10,000, 1,000) and State Plane (510,509, 2,267,433). (2) Site System coordinates from MP&W site map (File 74, Drawing ELF0080K) dated 10/22/15. (3) State Plane coordinates from MP&W in dated 1/20/16. (4) DNR original well construction forms. (5) Wells MW-9, MW-11, MW-12, and MW-17 are water level measuring points only. PZ-1 through PZ-5 are leachate head measureing points only. MW-17 was damaged and plugged & abandoned in December (6) Period of record: (except for the A-series wells which started in 2012). Current review from: DNR Sampling Forms dated April 17, (7) Negative value is a discharge gradient; positive value is a recharge gradient. Well clusters are MW-8/MW-9 and MW-10/11/12. GMP wells are BOLD. Others are water level measurement points. NA not available; N/A not applicable.

19 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Table 2 Implementation Schedule 2017 Groundwater Monitoring and Corrective Action Report Muscatine Power & Water CCR Landfill Permit No. #70-SDP-06-82P Dates Of Completed Sampling Events And Constiuents Tested Number Of Samples Collected In Each Monitoring Program June 2016 through 2017 Establish Background Levels (Initial 8 Events) Detection Monitoring Resampling Events To Verify Initial SSI Over Background Assessment Monitoring Corrective Action Monitoring Well Well Function Background Detection Assessment Corrective Action 2016: Jun 6, Aug 15, Oct 10, Dec : Feb 17, Apr 17, Jun 19, Aug 7, 10/16/ /28/2017 None in 2017 None in 2017 MW-4A Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III MW-5B Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Chloride MW-6A Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III MW-8 Upgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III MW-10 Upgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III MW-13 Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Boron, calcium, sulfate, TDS MW-14A Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Boron, calcium, chloride, sulfate, TDS MW-15A Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Boron, calcium, chloride, sulfate, TDS MW-18A Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Boron, calcium, chloride, sulfate, TDS MW-21 Downgradient 8 1 N/A N/A Appendix III & IV Appendix III & IV Appendix III Boron, ph

20 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water Table 3 Groundwater Monitoring Program Summary 2017 Groundwater Monitoring and Corrective Action Report Muscatine Power & Water CCR Landfill Permit No. #70-SDP-06-82P Monitoring Well Current Monitoring Program Status Planned Change in Monitoring Program Status For The Next Sampling Event Confirmed Statistically Signifiant Increase (SSI) Over Background Statistically Significant Trends Statistically Significant Level (SSL) Over Standard Resample Upcoming Sampling Dates And Constituents Semi-Annual and Assessment Monitoring: By March 19, 2018 Semi-Annual Monitoring: By September 19, 2018 Others TBD, if needed MW-4A Detection None None None N/A Appendix III & IV Appendix III + TBD MW-5B Detection Assessment Chloride None N/A Appendix III & IV Appendix III + TBD MW-6A Detection None None None N/A Appendix III & IV Appendix III + TBD MW-8 Background None None None N/A Appendix III & IV Appendix III + TBD MW-10 Background None None None N/A Appendix III & IV Appendix III + TBD MW-13 Detection Assessment Boron None N/A Appendix III & IV Appendix III + TBD MW-14A Detection Assessment Boron, calcium, chloride, sulfate, TDS None N/A Appendix III & IV Appendix III + TBD MW-15A Detection Assessment Boron, calcium, chloride, sulfate, TDS None N/A Appendix III & IV Appendix III + TBD MW-18A Detection Assessment Boron, calcium, chloride, sulfate, TDS None N/A Appendix III & IV Appendix III + TBD MW-21 Detection Assessment Boron, ph None N/A Appendix III & IV Appendix III + TBD Assessment monitoring program triggered upon receipt of confirmed (by resample) SSI on December 19, SSI = Statistically Significant Increase above background (confirmed by resample) SSL = Statistically Significant Level above groundwater protection standard N/A = Not Applicable

21 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water TABLE 4 Leachate Composition April Groundwater Monitoring and Corrective Action Report Muscatine Power & Water CCR Landfill Permit No. #70-SDP-06-82P MANHOLE A PZ-1 PZ-2 PZ-3 PZ-4 PZ-5 Total Dissolved Solids Dry Mercury < < < < < Dry Chloride Dry Fluoride Dry Sulfate Dry Lithium < Dry Aluminum < < Dry Antimony < < Dry Barium < < Dry Beryllium < < < < Dry Cadmium < < < < Dry Chromium < < < Dry Cobalt <0.500 < < < Dry Lead < < Dry Manganese < Dry Molybdenum < Dry Selenium < < < Dry Thallium < < < Dry Arsenic < Dry Calcium Dry Boron Dry Radium Dry Radium Dry Combined Radium Dry

22 HR Green, Inc. Project No Annual GMCA Report CCR Landfill Muscatine Power & Water APPENDIX C SAMPLING DATA Summary Tabulations of Analytical Results October 16, 2017 First Detection Monitoring Event Documentation o Laboratory Analytical Report o Low Flow Sampling Forms o Groundwater Sampling Forms November 28, 2017 First Resampling Event Documentation o Laboratory Analytical Report o Low Flow Sampling Forms o Groundwater Sampling Forms

23 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-4A Appendix III Parameters: Boron mg/l <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 Calcium mg/l Chloride mg/l Fluoride mg/l <.5 <.5 <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l < <.0005 <.0005 <.0005 <.0005 <.0005 < <.0005 Fluoride mg/l <.5 <.5 <.5 < <.5 <.5 Lead mg/l < <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 M.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

24 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-5B Appendix III Parameters: Boron mg/l <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 Calcium mg/l 147 < Chloride mg/l Fluoride mg/l <.5 <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l <.5 <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

25 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-6A Appendix III Parameters: Boron mg/l <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 Calcium mg/l Chloride mg/l 5.97 < 5 < <.5 < 5 < 5 < 5 Fluoride mg/l <.5 <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l < 5 < 5 < 5 < < 5 < 5 < 5 < 5 Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l <.5 <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 < <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

26 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-08 Upgradient Appendix III Parameters: Boron mg/l <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 Calcium mg/l Chloride mg/l Fluoride mg/l <.5 <.5 < < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.0005 <.0005 <.0005 <.0005 <.0005 < Fluoride mg/l <.5 <.5 < < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

27 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-10 Upgradient Appendix III Parameters: Boron mg/l <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 <.2 Calcium mg/l Chloride mg/l 6.22 < 5 < 5 < 5 < 5 < 5 < 5 < 5 < 5 Fluoride mg/l <.5 <.5 <.5 < <.5 < 5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l < Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l 89.3 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l < Fluoride mg/l <.5 <.5 <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <. 05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

28 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-13 Appendix III Parameters: Boron mg/l Calcium mg/l Chloride mg/l Fluoride mg/l < <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <. 002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 < Cobalt mg/l Fluoride mg/l < <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.100 <.05 <.150 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l Selenium mg/l <.005 < <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

29 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-14A Appendix III Parameters: Boron mg/l Calcium mg/l Chloride mg/l Fluoride mg/l <.5 < <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l <.5 < <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.05 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

30 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-15A Appendix III Parameters: Boron mg/l Calcium mg/l Chloride mg/l Fluoride mg/l < <.5 <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.1 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.250 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l < <.5 <.5 < <.5 <.5 Lead mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.1 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.25 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

31 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-18A Appendix III Parameters: Boron mg/l Calcium mg/l Chloride mg/l Fluoride mg/l <.5 < <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.1 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l < Beryllium mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.250 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Cobalt mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l <.5 < <.5 < <.5 <.5 Lead mg/l <.025 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.1 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l <.25 <.005 <.005 <.005 <.005 <.005 <.005 <.005 Thallium mg/l <.05 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

32 June-16 August-16 October-16 December-16 February-17 April-17 June-17 August-17 October-17 November-17 Muscatine Power & Water CCR Landfill Federal Parameters Job # MW-21 Appendix III Parameters: Boron mg/l < Calcium mg/l Chloride mg/l Fluoride mg/l <.5 <.5 <.5 < <.5 <.5 <.5 ph SU Sulfate mg/l Total Dissolved Solids mg/l Appendix IV Parameters: Anitmony mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Arsenic mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Barium mg/l Beryllium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Cadmium mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Chromium mg/l <.005 < Cobalt mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Fluoride mg/l <.5 <.5 <.5 < <.5 <.5 Lead mg/l <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 <.0005 Lithium mg/l <.05 <.05 <.05 <.05 <.05 <.05 <.05 <.05 Mercury mg/l <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 <.0002 Molybdenum mg/l <.002 <.002 <.002 <.002 <.002 <.002 <.002 <.002 Selenium mg/l Thallium mg/l <.001 <.001 <.001 <.001 <.001 <.001 <.001 <.001 Radium-226 mg/l Radium-228 mg/l Combined Radium mg/l

33

34 ANALYTICAL REPORT TestAmerica Laboratories, Inc. TestAmerica Cedar Falls 704 Enterprise Drive Cedar Falls, IA Tel: (319) TestAmerica Job ID: Client Project/Site: Musctaine Power & Water CCR Landfill Sampling Event: Quarterly CCR Revision: 1 For: Muscatine Power & Water 1700 Dick Drake Way PO BOX 899 Muscatine, Iowa Attn: Sam Bennett Authorized for release by: 11/7/2017 9:18:11 AM Shawn Hayes, Senior Project Manager (319) shawn.hayes@testamericainc.com This report has been electronically signed and authorized by the signatory. Electronic signature is intended to be the legally binding equivalent of a traditionally handwritten signature. Results relate only to the items tested and the sample(s) as received by the laboratory.

35 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Table of Contents TestAmerica Job ID: Cover Page Table of Contents Case Narrative Sample Summary Detection Summary Client Sample Results Definitions QC Sample Results QC Association Chronicle Certification Summary Method Summary Chain of Custody Receipt Checklists Page 2 of 36 TestAmerica Cedar Falls 11/7/2017 (Rev. 1)

36 Case Narrative Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Job ID: Laboratory: TestAmerica Cedar Falls Narrative Comments No additional comments. Job Narrative Receipt The samples were received on 10/19/2017 9:45 AM; the samples arrived in good condition, properly preserved and, where required, on ice. The temperature of the cooler at receipt was 4.9º C. HPLC/IC No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. Metals No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. General Chemistry No analytical or quality issues were noted, other than those described in the Definitions/Glossary page TestAmerica Cedar Falls Page 3 of 36 11/7/2017 (Rev. 1)

37 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Sample Summary TestAmerica Job ID: Lab Sample ID Client Sample ID Matrix Collected Received MW-08 Ground Water 10/16/17 11:10 10/19/17 09: MW-10 Ground Water 10/16/17 10:10 10/19/17 09: MW-4A Ground Water 10/16/17 14:50 10/19/17 09: MW-5B Ground Water 10/17/17 09:55 10/19/17 09: MW-6A Ground Water 10/17/17 08:50 10/19/17 09: MW-13 Ground Water 10/16/17 12:20 10/19/17 09: MW-14A Ground Water 10/17/17 12:00 10/19/17 09: MW-15A Ground Water 10/17/17 11:10 10/19/17 09: MW-18A Ground Water 10/17/17 14:00 10/19/17 09: MW-21 Ground Water 10/16/17 13:40 10/19/17 09: DUP-1 Ground Water 10/16/17 12:00 10/19/17 09: TestAmerica Cedar Falls Page 4 of 36 11/7/2017 (Rev. 1)

38 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Detection Summary TestAmerica Job ID: Client Sample ID: MW-08 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.4 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-10 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Sulfate mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.3 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-4A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.8 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-5B Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.3 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-6A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.8 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-13 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A This Detection Summary does not include radiochemical test results. TestAmerica Cedar Falls Page 5 of 36 11/7/2017 (Rev. 1)

39 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Detection Summary TestAmerica Job ID: Client Sample ID: MW-13 (Continued) Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.2 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-14A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.6 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-15A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.2 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-18A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 7.1 HF 0.1 SU 1 SM 4500 H+ B Client Sample ID: MW-21 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 6.8 HF 0.1 SU 1 SM 4500 H+ B This Detection Summary does not include radiochemical test results. TestAmerica Cedar Falls Page 6 of 36 11/7/2017 (Rev. 1)

40 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Detection Summary TestAmerica Job ID: Client Sample ID: DUP-1 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 6.8 HF 0.1 SU 1 SM 4500 H+ B This Detection Summary does not include radiochemical test results. TestAmerica Cedar Falls Page 7 of 36 11/7/2017 (Rev. 1)

41 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-08 Date Collected: 10/16/17 11:10 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 11:03 5 Fluoride < mg/l 10/24/17 11:03 5 Sulfate 106 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 5.00 mg/l 10/24/17 11:03 5 RL Boron < mg/l 10/20/17 07:46 10/31/17 14:05 1 Calcium 77.0 General Chemistry Analyte Result Qualifier MDL Unit D Prepared Analyzed Dil Fac mg/l 10/20/17 07:46 10/30/17 20:43 1 RL Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL MDL RL Unit D Prepared Prepared Analyzed Analyzed ph 7.4 HF 0.1 SU 10/19/17 21:19 1 Unit D Dil Fac Dil Fac TestAmerica Cedar Falls Page 8 of 36 11/7/2017 (Rev. 1)

42 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-10 Date Collected: 10/16/17 10:10 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride < mg/l 10/24/17 11:49 5 Fluoride <0.500 Sulfate 46.9 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac mg/l 10/24/17 11: mg/l 10/24/17 11:49 5 RL Boron < mg/l 10/20/17 07:46 10/31/17 14:14 1 Calcium 83.3 General Chemistry Analyte Result Qualifier MDL Unit D Prepared Analyzed Dil Fac mg/l 10/20/17 07:46 10/31/17 14:14 1 RL Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL MDL RL Unit D Prepared Prepared Analyzed Analyzed ph 7.3 HF 0.1 SU 10/19/17 21:21 1 Unit D Dil Fac Dil Fac TestAmerica Cedar Falls Page 9 of 36 11/7/2017 (Rev. 1)

43 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-4A Date Collected: 10/16/17 14:50 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 12:05 5 Fluoride < mg/l 10/24/17 12:05 5 Sulfate 45.4 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 5.00 mg/l 10/24/17 12:05 5 RL Boron < mg/l 10/20/17 07:46 10/31/17 14:17 1 Calcium 85.3 General Chemistry Analyte Result Qualifier MDL Unit D Prepared Analyzed Dil Fac mg/l 10/20/17 07:46 10/31/17 14:17 1 RL Total Dissolved Solids mg/l 10/20/17 09:43 1 Analyte Result Qualifier RL MDL RL Unit D Prepared Prepared Analyzed Analyzed ph 7.8 HF 0.1 SU 10/19/17 21:31 1 Unit D Dil Fac Dil Fac TestAmerica Cedar Falls Page 10 of 36 11/7/2017 (Rev. 1)

44 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-5B Date Collected: 10/17/17 09:55 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 12:20 5 Fluoride < mg/l 10/24/17 12:20 5 Sulfate 135 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 5.00 mg/l 10/24/17 12:20 5 RL Boron < mg/l 10/20/17 07:46 11/01/17 14:05 1 Calcium 136 General Chemistry Analyte Result Qualifier MDL Unit D Prepared Analyzed Dil Fac mg/l 10/20/17 07:46 10/31/17 14:29 1 RL Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL MDL RL Unit D Prepared Prepared Analyzed Analyzed ph 7.3 HF 0.1 SU 10/19/17 21:33 1 Unit D Dil Fac Dil Fac TestAmerica Cedar Falls Page 11 of 36 11/7/2017 (Rev. 1)

45 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-6A Date Collected: 10/17/17 08:50 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride < mg/l 10/24/17 13:05 5 Fluoride <0.500 Sulfate <5.00 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac mg/l 10/24/17 13: mg/l 10/24/17 13:05 5 RL Boron < mg/l 10/20/17 07:46 11/01/17 14:08 1 Calcium 71.9 General Chemistry Analyte Result Qualifier MDL Unit D Prepared Analyzed Dil Fac mg/l 10/20/17 07:46 10/31/17 14:32 1 RL Total Dissolved Solids mg/l 10/20/17 09:43 1 Analyte Result Qualifier RL MDL RL Unit D Prepared Prepared Analyzed Analyzed ph 7.8 HF 0.1 SU 10/19/17 21:43 1 Unit D Dil Fac Dil Fac TestAmerica Cedar Falls Page 12 of 36 11/7/2017 (Rev. 1)

46 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-13 Date Collected: 10/16/17 12:20 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 13:20 5 Fluoride < mg/l 10/24/17 13:20 5 Sulfate 931 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 50.0 mg/l 10/25/17 15:33 50 RL Boron mg/l 10/20/17 07:46 11/01/17 14:20 20 Calcium mg/l 10/20/17 07:46 10/31/17 14:35 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:43 1 Analyte Result Qualifier RL ph 7.2 HF 0.1 SU 10/19/17 21:45 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 13 of 36 11/7/2017 (Rev. 1)

47 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-14A Date Collected: 10/17/17 12:00 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 14:06 5 Fluoride < mg/l 10/24/17 14:06 5 Sulfate 1210 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 50.0 mg/l 10/25/17 15:49 50 RL Boron mg/l 10/20/17 07:46 11/01/17 14:23 10 Calcium mg/l 10/20/17 07:46 10/31/17 14:38 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:25 1 Analyte Result Qualifier RL ph 7.6 HF 0.1 SU 10/19/17 21:52 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 14 of 36 11/7/2017 (Rev. 1)

48 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-15A Date Collected: 10/17/17 11:10 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 14:37 5 Fluoride < mg/l 10/24/17 14:37 5 Sulfate 835 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 20.0 mg/l 10/25/17 16:05 20 RL Boron mg/l 10/20/17 07:46 11/01/17 14:26 10 Calcium mg/l 10/20/17 07:46 10/31/17 14:41 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:43 1 Analyte Result Qualifier RL ph 7.2 HF 0.1 SU 10/19/17 22:39 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 15 of 36 11/7/2017 (Rev. 1)

49 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-18A Date Collected: 10/17/17 14:00 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 15:08 5 Fluoride < mg/l 10/24/17 15:08 5 Sulfate 808 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 50.0 mg/l 10/25/17 16:20 50 RL Boron mg/l 10/20/17 07:46 11/01/17 14:29 10 Calcium mg/l 10/20/17 07:46 10/31/17 14:45 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL ph 7.1 HF 0.1 SU 10/19/17 22:41 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 16 of 36 11/7/2017 (Rev. 1)

50 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-21 Date Collected: 10/16/17 13:40 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 15:39 5 Fluoride < mg/l 10/24/17 15:39 5 Sulfate 206 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 5.00 mg/l 10/25/17 16:35 5 RL Boron mg/l 10/20/17 07:46 11/01/17 14:33 5 Calcium mg/l 10/20/17 07:46 10/31/17 14:48 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL ph 6.8 HF 0.1 SU 10/19/17 22:43 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 17 of 36 11/7/2017 (Rev. 1)

51 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: DUP-1 Date Collected: 10/16/17 12:00 Date Received: 10/19/17 09:45 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier Client Sample Results RL MDL TestAmerica Job ID: Lab Sample ID: Matrix: Ground Water Prepared Analyzed Chloride mg/l 10/24/17 16:10 5 Fluoride < mg/l 10/24/17 16:10 5 Sulfate 204 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier Unit D Dil Fac 5.00 mg/l 10/25/17 16:50 5 RL Boron mg/l 10/20/17 07:46 11/01/17 14:36 5 Calcium mg/l 10/20/17 07:46 10/31/17 14:51 1 General Chemistry Analyte Result Qualifier RL MDL MDL Unit D Prepared Prepared Analyzed Analyzed Total Dissolved Solids mg/l 10/20/17 09:34 1 Analyte Result Qualifier RL ph 6.8 HF 0.1 SU 10/19/17 22:44 1 RL Unit Unit D D Prepared Analyzed Dil Fac Dil Fac Dil Fac TestAmerica Cedar Falls Page 18 of 36 11/7/2017 (Rev. 1)

52 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Qualifiers General Chemistry Qualifier HF Glossary Abbreviation Qualifier Description Definitions/Glossary Field parameter with a holding time of 15 minutes. Test performed by laboratory at client's request. These commonly used abbreviations may or may not be present in this report. Listed under the "D" column to designate that the result is reported on a dry weight basis %R Percent Recovery CFL CNF DER Dil Fac DL DL, RA, RE, IN DLC EDL LOD LOQ MDA MDC MDL ML NC ND PQL QC RER RL RPD TEF TEQ Contains Free Liquid Contains No Free Liquid Duplicate Error Ratio (normalized absolute difference) Dilution Factor Detection Limit (DoD/DOE) Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample Decision Level Concentration (Radiochemistry) Estimated Detection Limit (Dioxin) Limit of Detection (DoD/DOE) Limit of Quantitation (DoD/DOE) Minimum Detectable Activity (Radiochemistry) Minimum Detectable Concentration (Radiochemistry) Method Detection Limit Minimum Level (Dioxin) Not Calculated Not Detected at the reporting limit (or MDL or EDL if shown) Practical Quantitation Limit Quality Control Relative Error Ratio (Radiochemistry) Reporting Limit or Requested Limit (Radiochemistry) Relative Percent Difference, a measure of the relative difference between two points Toxicity Equivalent Factor (Dioxin) Toxicity Equivalent Quotient (Dioxin) TestAmerica Job ID: TestAmerica Cedar Falls Page 19 of 36 11/7/2017 (Rev. 1)

53 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Method: 9056A - Anions, Ion Chromatography Lab Sample ID: MB /3 Matrix: Water Analysis Batch: Analyte MB MB Result Qualifier QC Sample Results RL MDL TestAmerica Job ID: Client Sample ID: Method Blank Prep Type: Prepared Analyzed Chloride < mg/l 10/24/17 10:07 1 Fluoride Sulfate Lab Sample ID: LCS /4 Matrix: Water Analysis Batch: Analyte Unit D Dil Fac < mg/l 10/24/17 10:07 1 < mg/l 10/24/17 10:07 1 Spike Added LCS LCS Result Qualifier Client Sample ID: Lab Control Sample Prep Type: Chloride mg/l Fluoride mg/l Sulfate mg/l Lab Sample ID: MS Matrix: Ground Water Analysis Batch: Sample Sample Analyte Result Qualifier Spike Added MS MS Result Qualifier Chloride mg/l Fluoride < mg/l Sulfate mg/l Unit Unit D D %Rec %Rec. Limits Client Sample ID: MW-08 Prep Type: %Rec %Rec. Limits Lab Sample ID: MSD Client Sample ID: MW-08 Matrix: Ground Water Prep Type: Analysis Batch: Sample Sample Spike MSD MSD %Rec. RPD Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit Chloride mg/l Fluoride < mg/l Sulfate mg/l Method: 6020A - Metals (ICP/MS) Lab Sample ID: MB /1-A Client Sample ID: Method Blank Matrix: Water Prep Type: Analysis Batch: Prep Batch: MB MB Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Calcium < mg/l 10/20/17 07:46 10/30/17 20:37 1 Lab Sample ID: MB /1-A Client Sample ID: Method Blank Matrix: Water Prep Type: Analysis Batch: Prep Batch: MB MB Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron < mg/l 10/20/17 07:46 10/31/17 13:59 1 TestAmerica Cedar Falls Page 20 of 36 11/7/2017 (Rev. 1)

54 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Method: 6020A - Metals (ICP/MS) (Continued) QC Sample Results TestAmerica Job ID: Lab Sample ID: LCS /2-A Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Prep Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Calcium mg/l Lab Sample ID: LCS /2-A Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Prep Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Boron mg/l Lab Sample ID: MS Client Sample ID: MW-08 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample Spike MS MS %Rec. Analyte Result Qualifier Added Result Qualifier Calcium mg/l Lab Sample ID: MS Client Sample ID: MW-08 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample Spike MS MS %Rec. Analyte Result Qualifier Added Result Qualifier Boron < mg/l Unit Unit Unit Unit D D D D %Rec %Rec %Rec %Rec Limits Limits Limits Limits Lab Sample ID: MSD Client Sample ID: MW-08 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample Spike MSD MSD %Rec. RPD Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit Calcium mg/l Lab Sample ID: MSD Client Sample ID: MW-08 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample Spike MSD MSD %Rec. RPD Analyte Result Qualifier Added Result Qualifier Unit D %Rec Limits RPD Limit Boron < mg/l Lab Sample ID: DU Client Sample ID: DUP-1 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample DU DU RPD Analyte Result Qualifier Result Qualifier Unit D RPD Limit Calcium mg/l 3 20 Lab Sample ID: DU Client Sample ID: DUP-1 Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample DU DU RPD Analyte Result Qualifier Result Qualifier Unit D RPD Limit Boron mg/l 2 20 TestAmerica Cedar Falls Page 21 of 36 11/7/2017 (Rev. 1)

55 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill QC Sample Results Method: SM 2540C - Solids, Total Dissolved (TDS) Lab Sample ID: MB /1 Matrix: Water Analysis Batch: Analyte MB MB Result Qualifier RL MDL TestAmerica Job ID: Client Sample ID: Method Blank Prep Type: Prepared Analyzed Total Dissolved Solids < mg/l 10/20/17 09:25 1 Lab Sample ID: LCS /2 Matrix: Water Analysis Batch: Analyte Spike Added LCS LCS Unit Result Qualifier D Dil Fac Client Sample ID: Lab Control Sample Prep Type: Total Dissolved Solids mg/l Lab Sample ID: MB /1 Matrix: Water Analysis Batch: Analyte MB MB Result Qualifier RL MDL Unit D %Rec %Rec. Limits Client Sample ID: Method Blank Prep Type: Prepared Analyzed Total Dissolved Solids < mg/l 10/20/17 09:34 1 Lab Sample ID: LCS /2 Matrix: Water Analysis Batch: Analyte Spike Added LCS LCS Unit Result Qualifier D Dil Fac Client Sample ID: Lab Control Sample Prep Type: Total Dissolved Solids mg/l Unit D %Rec %Rec. Limits Lab Sample ID: DU Matrix: Surface Water Analysis Batch: Sample Client Sample ID: SW-24 Prep Type: Sample DU DU RPD Analyte Result Qualifier Result Qualifier Unit D RPD Limit Total Dissolved Solids mg/l 3 24 Lab Sample ID: MB /1 Client Sample ID: Method Blank Matrix: Water Prep Type: Analysis Batch: MB MB Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Total Dissolved Solids < mg/l 10/20/17 09:43 1 Lab Sample ID: LCS /2 Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Unit D %Rec Limits Total Dissolved Solids mg/l TestAmerica Cedar Falls Page 22 of 36 11/7/2017 (Rev. 1)

56 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill QC Sample Results Method: SM 2540C - Solids, Total Dissolved (TDS) (Continued) Lab Sample ID: DU Matrix: Ground Water Analysis Batch: Sample Sample Analyte Result Qualifier DU DU Result Qualifier TestAmerica Job ID: Client Sample ID: MW-15A Prep Type: Total Dissolved Solids mg/l 7 24 Method: SM 4500 H+ B - ph Lab Sample ID: LCS /1 Matrix: Water Analysis Batch: Analyte Spike Added LCS LCS Result Qualifier Unit D RPD RPD Limit Client Sample ID: Lab Control Sample Prep Type: ph SU Lab Sample ID: LCS /26 Matrix: Water Analysis Batch: Analyte Spike Added LCS LCS Result Qualifier Unit D %Rec %Rec. Limits Client Sample ID: Lab Control Sample Prep Type: ph SU Lab Sample ID: DU Matrix: Ground Water Analysis Batch: Sample Sample Analyte Result Qualifier DU DU Result Qualifier Unit D %Rec %Rec. Limits Client Sample ID: MW-15A Prep Type: ph 7.2 HF 7.2 SU Unit D RPD RPD Limit TestAmerica Cedar Falls Page 23 of 36 11/7/2017 (Rev. 1)

57 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill HPLC/IC Analysis Batch: QC Association Summary TestAmerica Job ID: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water 9056A MW MW-4A MW-5B MW-6A MW MW MW-14A MW-14A MW-15A MW-15A MW-18A MW-18A MW MW DUP DUP-1 Metals Prep Batch: Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A 9056A Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water 3010A MW MW-4A MW-5B MW-6A MW MW-14A MW-15A MW-18A MW DUP-1 Analysis Batch: Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water 6020A Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water 6020A MW MW-4A MW-5B MW-6A MW MW-14A MW-15A MW-18A MW A 3010A 3010A 3010A 3010A 3010A 3010A 3010A 3010A 3010A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A TestAmerica Cedar Falls Page 24 of 36 11/7/2017 (Rev. 1)

58 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Metals (Continued) Analysis Batch: (Continued) QC Association Summary TestAmerica Job ID: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch DUP-1 Ground Water 6020A Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-5B Ground Water 6020A MW-6A MW MW-14A MW-15A MW-18A MW DUP-1 General Chemistry Analysis Batch: Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Ground Water 6020A Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water SM 4500 H+ B MW MW-4A MW-5B MW-6A MW MW-14A MW-15A MW-18A MW DUP-1 Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water Ground Water SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B SM 4500 H+ B Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-14A Ground Water SM 2540C Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-08 Ground Water SM 2540C MW-10 Ground Water SM 2540C MW-5B Ground Water SM 2540C MW-18A Ground Water SM 2540C MW-21 Ground Water SM 2540C DUP-1 Ground Water SM 2540C Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-4A Ground Water SM 2540C MW-6A Ground Water SM 2540C MW-13 Ground Water SM 2540C MW-15A Ground Water SM 2540C TestAmerica Cedar Falls Page 25 of 36 11/7/2017 (Rev. 1)

59 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-08 Lab Sample ID: Date Collected: 10/16/17 11:10 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 11:03 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /30/17 20:43 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:05 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:19 JMH TAL CF Client Sample ID: MW-10 Lab Sample ID: Date Collected: 10/16/17 10:10 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 11:49 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:14 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:21 JMH TAL CF Lab Lab Client Sample ID: MW-4A Lab Sample ID: Date Collected: 10/16/17 14:50 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 12:05 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:17 OAD TAL CF Analysis SM 2540C /20/17 09:43 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:31 JMH TAL CF Lab Client Sample ID: MW-5B Lab Sample ID: Date Collected: 10/17/17 09:55 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 12:20 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:29 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:05 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:33 JMH TAL CF Lab TestAmerica Cedar Falls Page 26 of 36 11/7/2017 (Rev. 1)

60 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: MW-6A Lab Sample ID: Date Collected: 10/17/17 08:50 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 13:05 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:32 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:08 OAD TAL CF Analysis SM 2540C /20/17 09:43 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:43 JMH TAL CF Client Sample ID: MW-13 Lab Sample ID: Date Collected: 10/16/17 12:20 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 13:20 SAD TAL CF Analysis 9056A /25/17 15:33 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:35 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:20 OAD TAL CF Analysis SM 2540C /20/17 09:43 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:45 JMH TAL CF Lab Lab Client Sample ID: MW-14A Lab Sample ID: Date Collected: 10/17/17 12:00 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 14:06 SAD TAL CF Analysis 9056A /25/17 15:49 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:38 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:23 OAD TAL CF Analysis SM 2540C /20/17 09:25 SAS TAL CF Analysis SM 4500 H+ B /19/17 21:52 JMH TAL CF Lab Client Sample ID: MW-15A Lab Sample ID: Date Collected: 10/17/17 11:10 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 14:37 SAD TAL CF Lab TestAmerica Cedar Falls Page 27 of 36 11/7/2017 (Rev. 1)

61 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /25/17 16:05 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:41 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:26 OAD TAL CF Analysis SM 2540C /20/17 09:43 SAS TAL CF Analysis SM 4500 H+ B /19/17 22:39 JMH TAL CF Client Sample ID: MW-18A Lab Sample ID: Date Collected: 10/17/17 14:00 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 15:08 SAD TAL CF Analysis 9056A /25/17 16:20 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:45 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:29 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 22:41 JMH TAL CF Lab Lab Client Sample ID: MW-21 Lab Sample ID: Date Collected: 10/16/17 13:40 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 15:39 SAD TAL CF Analysis 9056A /25/17 16:35 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:48 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /01/17 14:33 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 22:43 JMH TAL CF Lab Client Sample ID: DUP-1 Lab Sample ID: Date Collected: 10/16/17 12:00 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 9056A /24/17 16:10 SAD TAL CF Analysis 9056A /25/17 16:50 SAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Analysis 6020A /31/17 14:51 OAD TAL CF Prep 3010A /20/17 07:46 JNR TAL CF Lab TestAmerica Cedar Falls Page 28 of 36 11/7/2017 (Rev. 1)

62 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Client Sample ID: DUP-1 Lab Sample ID: Date Collected: 10/16/17 12:00 Matrix: Ground Water Date Received: 10/19/17 09:45 Prep Type Batch Type Laboratory References: Batch Method Run Dilution Factor Batch Number Prepared or Analyzed Analyst Analysis 6020A /01/17 14:36 OAD TAL CF Analysis SM 2540C /20/17 09:34 SAS TAL CF Analysis SM 4500 H+ B /19/17 22:44 JMH TAL CF TAL CF = TestAmerica Cedar Falls, 704 Enterprise Drive, Cedar Falls, IA 50613, TEL (319) Lab TestAmerica Cedar Falls Page 29 of 36 11/7/2017 (Rev. 1)

63 Accreditation/Certification Summary Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Musctaine Power & Water CCR Landfill Laboratory: TestAmerica Cedar Falls All accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report. Authority Program EPA Region Identification Number Expiration Date AIHA-LAP, LLC IHLAP Georgia State Program 4 IA (OR) Illinois NELAP Iowa State Program Kansas NELAP 7 E Minnesota NELAP Minnesota (Petrofund) State Program North Dakota State Program 8 R * Oregon NELAP 10 IA * Accreditation/Certification renewal pending - accreditation/certification considered valid. TestAmerica Cedar Falls Page 30 of 36 11/7/2017 (Rev. 1)

64 Client: Muscatine Power & Water Project/Site: Musctaine Power & Water CCR Landfill Method Summary TestAmerica Job ID: Method Method Description Protocol Laboratory 9056A Anions, Ion Chromatography SW846 TAL CF 6020A Metals (ICP/MS) SW846 TAL CF SM 2540C Solids, Total Dissolved (TDS) SM TAL CF SM 4500 H+ B ph SM TAL CF Protocol References: SM = "Standard Methods For The Examination Of Water And Wastewater", SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates. Laboratory References: TAL CF = TestAmerica Cedar Falls, 704 Enterprise Drive, Cedar Falls, IA 50613, TEL (319) TestAmerica Cedar Falls Page 31 of 36 11/7/2017 (Rev. 1)

65 Page 32 of 36 11/7/2017 (Rev. 1)

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69 Login Sample Receipt Checklist Client: Muscatine Power & Water Job Number: Login Number: List Source: TestAmerica Cedar Falls List Number: 1 Creator: Patrick, Kathryn E Question Answer Comment Radioactivity wasn't checked or is </= background as measured by a survey meter. The cooler's custody seal, if present, is intact. Sample custody seals, if present, are intact. The cooler or samples do not appear to have been compromised or tampered with. Samples were received on ice. Cooler Temperature is acceptable. Cooler Temperature is recorded. COC is present. COC is filled out in ink and legible. COC is filled out with all pertinent information. Is the Field Sampler's name present on COC? There are no discrepancies between the containers received and the COC. Samples are received within Holding Time (excluding tests with immediate HTs) Sample containers have legible labels. Containers are not broken or leaking. Sample collection date/times are provided. Appropriate sample containers are used. Sample bottles are completely filled. Sample Preservation Verified. There is sufficient vol. for all requested analyses, incl. any requested MS/MSDs Containers requiring zero headspace have no headspace or bubble is <6mm (1/4"). Multiphasic samples are not present. Samples do not require splitting or compositing. Residual Chlorine Checked. N/A True N/A True True True True True True True True True True True True True True True True True True True True N/A TestAmerica Cedar Falls Page 36 of 36 11/7/2017 (Rev. 1)

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71 LOW FLOW SAMPLING FORM DATE 10/16/2017 WELL ID MW-4A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 5.85 NOTE PROJECT # WELL DEPTH WEATHER Clear, 66 o F, W 7-17mph, 30.26" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 14: : : : : : : : NOTES 10/16/ ' After Sampling Preservative # of Containers HNO 3 1 None min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% or +/-0.2 mg Limits HCl

72 LOW FLOW SAMPLING FORM DATE 10/17/2017 WELL ID MW-5B SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 2.92 NOTE PROJECT # WELL DEPTH WEATHER Clear, 59 o F, SW 11-18mph, 30.20" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(ml) DTW TEMP Ph ORP SpecCond Turbidity DO 9: : : : : : : : NOTES 10/17/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

73 LOW FLOW SAMPLING FORM DATE 10/17/2017 WELL ID MW-6A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 3.26 NOTE PROJECT # WELL DEPTH WEATHER Clear, 52 o F, SSE 8 mph, 30.20" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 8: : : : : : : NOTES 10/17/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

74 LOW FLOW SAMPLING FORM DATE 10/16/2017 WELL ID MW-08 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 54 o F, Calm, 30.35" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 10: : : : : : : NOTES 10/16/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

75 LOW FLOW SAMPLING FORM DATE 10/16/2017 WELL ID MW-10 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 3.68 NOTE PROJECT # WELL DEPTH WEATHER Clear, 50 o F,Calm, 30.35" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE 10/16/ ' TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 9: : : : : : : NOTES Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

76 LOW FLOW SAMPLING FORM DATE 10/16/2017 WELL ID MW-13 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 6.93 NOTE PROJECT # WELL DEPTH WEATHER Clear, 54 o F, Calm, 30.35" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 11: : : : : : : : : : NOTES 10/16/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

77 LOW FLOW SAMPLING FORM DATE 10/17/2017 WELL ID MW-14A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 66 o F, SSW mph, 30.19PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 11: : : : : : NOTES 10/17/ Rain Starting 15.5' After Sampling Preservative # of Containers DUP min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

78 LOW FLOW SAMPLING FORM DATE 10/17/2017 WELL ID MW-15A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 64oF, mph, 30.20" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 10: : : : : : : : : NOTES 10/17/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% HCl or +/-0.2 mg HNO 3 1 NaOH None 1 Limits

79 LOW FLOW SAMPLING FORM DATE 10/17/2017 WELL ID MW-18A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 70 o F, SW 14-22mph, 30.20" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 12: : : : : : : : : : : : : : : : : : : : /17/ ' NOTES After Sampling # of Containers Preservative min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

80 LOW FLOW SAMPLING FORM DATE 10/16/2017 WELL ID MW-21 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 63 o F, WSW 9 mph, 30PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 12: : : : : : : : : : : : : : : NOTES 10/16/ Duplicate 17' After Sampling After Duplicate Sampling "labeled 10/16/ " Preservative # of Containers DUP-1 HCl HNO None min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% or +/-0.2 mg Limits NaOH

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103 ANALYTICAL REPORT TestAmerica Laboratories, Inc. TestAmerica Cedar Falls 704 Enterprise Drive Cedar Falls, IA Tel: (319) TestAmerica Job ID: Client Project/Site: Muscatine Power & Water CCR For: Muscatine Power & Water 1700 Dick Drake Way PO BOX 899 Muscatine, Iowa Attn: Sam Bennett Authorized for release by: 12/6/2017 2:48:16 PM Shawn Hayes, Senior Project Manager (319) shawn.hayes@testamericainc.com This report has been electronically signed and authorized by the signatory. Electronic signature is intended to be the legally binding equivalent of a traditionally handwritten signature. Results relate only to the items tested and the sample(s) as received by the laboratory.

104 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Table of Contents TestAmerica Job ID: Cover Page Table of Contents Case Narrative Sample Summary Detection Summary Client Sample Results Definitions QC Sample Results QC Association Chronicle Certification Summary Method Summary Chain of Custody Receipt Checklists Page 2 of 24 TestAmerica Cedar Falls 12/6/2017

105 Case Narrative Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Muscatine Power & Water CCR Job ID: Laboratory: TestAmerica Cedar Falls Narrative Comments No additional comments. Job Narrative Receipt The samples were received on 11/30/2017 9:15 AM; the samples arrived in good condition, properly preserved and, where required, on ice. The temperature of the cooler at receipt was 3.5º C. HPLC/IC No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. Metals No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. General Chemistry No analytical or quality issues were noted, other than those described in the Definitions/Glossary page TestAmerica Cedar Falls Page 3 of 24 12/6/2017

106 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Sample Summary TestAmerica Job ID: Lab Sample ID Client Sample ID Matrix Collected Received MW-5B Ground Water 11/28/17 12:40 11/30/17 09: MW-13 Ground Water 11/28/17 10:40 11/30/17 09: MW-14A Ground Water 11/28/17 16:15 11/30/17 09: MW-15A Ground Water 11/28/17 14:05 11/30/17 09: MW-18A Ground Water 11/28/17 17:00 11/30/17 09: MW-21 Ground Water 11/28/17 11:40 11/30/17 09: TestAmerica Cedar Falls Page 4 of 24 12/6/2017

107 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Detection Summary TestAmerica Job ID: Client Sample ID: MW-5B Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Client Sample ID: MW-13 Lab Sample ID: Sulfate Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Client Sample ID: MW-14A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Client Sample ID: MW-15A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Client Sample ID: MW-18A Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Chloride mg/l A Sulfate mg/l A Boron mg/l A Calcium mg/l A Total Dissolved Solids mg/l 1 SM 2540C Client Sample ID: MW-21 Lab Sample ID: Analyte Result Qualifier RL MDL Unit Dil Fac D Method Prep Type Boron mg/l A Analyte Result Qualifier RL RL Unit Dil Fac D Method Prep Type ph 6.9 HF 0.1 SU 1 SM 4500 H+ B This Detection Summary does not include radiochemical test results. TestAmerica Cedar Falls Page 5 of 24 12/6/2017

108 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-5B Date Collected: 11/28/17 12:40 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Chloride mg/l 12/04/17 14: TestAmerica Cedar Falls Page 6 of 24 12/6/2017

109 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-13 Date Collected: 11/28/17 10:40 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Sulfate mg/l 12/04/17 14:27 50 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron mg/l 12/01/17 08:00 12/05/17 14:51 1 Calcium mg/l 12/01/17 08:00 12/04/17 21:28 1 General Chemistry Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Total Dissolved Solids mg/l 12/01/17 09: TestAmerica Cedar Falls Page 7 of 24 12/6/2017

110 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-14A Date Collected: 11/28/17 16:15 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Chloride mg/l 12/04/17 15:27 5 Sulfate mg/l 12/04/17 15:12 50 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron mg/l 12/01/17 08:00 12/05/17 15:15 7 Calcium mg/l 12/01/17 08:00 12/04/17 21:31 1 General Chemistry Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Total Dissolved Solids mg/l 12/01/17 09: TestAmerica Cedar Falls Page 8 of 24 12/6/2017

111 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-15A Date Collected: 11/28/17 14:05 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Chloride mg/l 12/04/17 15:57 5 Sulfate mg/l 12/04/17 15:42 20 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron mg/l 12/01/17 08:00 12/05/17 15:18 7 Calcium mg/l 12/01/17 08:00 12/04/17 21:34 1 General Chemistry Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Total Dissolved Solids mg/l 12/01/17 09: TestAmerica Cedar Falls Page 9 of 24 12/6/2017

112 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-18A Date Collected: 11/28/17 17:00 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 9056A - Anions, Ion Chromatography Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Chloride mg/l 12/04/17 16:27 5 Sulfate mg/l 12/04/17 16:12 50 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron mg/l 12/01/17 08:00 12/05/17 15:37 7 Calcium mg/l 12/01/17 08:00 12/04/17 21:37 1 General Chemistry Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Total Dissolved Solids mg/l 12/01/17 09: TestAmerica Cedar Falls Page 10 of 24 12/6/2017

113 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Client Sample Results TestAmerica Job ID: Client Sample ID: MW-21 Date Collected: 11/28/17 11:40 Date Received: 11/30/17 09:15 Lab Sample ID: Matrix: Ground Water 3 4 Method: 6020A - Metals (ICP/MS) Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron mg/l 12/01/17 08:00 12/05/17 15:06 1 General Chemistry Analyte Result Qualifier RL RL Unit D Prepared Analyzed Dil Fac ph 6.9 HF 0.1 SU 11/30/17 17: TestAmerica Cedar Falls Page 11 of 24 12/6/2017

114 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Qualifiers General Chemistry Qualifier HF Glossary Abbreviation Qualifier Description Definitions/Glossary Field parameter with a holding time of 15 minutes. Test performed by laboratory at client's request. These commonly used abbreviations may or may not be present in this report. Listed under the "D" column to designate that the result is reported on a dry weight basis %R Percent Recovery CFL CNF DER Dil Fac DL DL, RA, RE, IN DLC EDL LOD LOQ MDA MDC MDL ML NC ND PQL QC RER RL RPD TEF TEQ Contains Free Liquid Contains No Free Liquid Duplicate Error Ratio (normalized absolute difference) Dilution Factor Detection Limit (DoD/DOE) Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample Decision Level Concentration (Radiochemistry) Estimated Detection Limit (Dioxin) Limit of Detection (DoD/DOE) Limit of Quantitation (DoD/DOE) Minimum Detectable Activity (Radiochemistry) Minimum Detectable Concentration (Radiochemistry) Method Detection Limit Minimum Level (Dioxin) Not Calculated Not Detected at the reporting limit (or MDL or EDL if shown) Practical Quantitation Limit Quality Control Relative Error Ratio (Radiochemistry) Reporting Limit or Requested Limit (Radiochemistry) Relative Percent Difference, a measure of the relative difference between two points Toxicity Equivalent Factor (Dioxin) Toxicity Equivalent Quotient (Dioxin) TestAmerica Job ID: TestAmerica Cedar Falls Page 12 of 24 12/6/2017

115 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Method: 9056A - Anions, Ion Chromatography Lab Sample ID: MB /3 Matrix: Water Analysis Batch: Analyte MB Result MB Qualifier QC Sample Results RL MDL TestAmerica Job ID: Client Sample ID: Method Blank Prep Type: Prepared Analyzed Chloride < mg/l 12/04/17 12:12 1 Sulfate Lab Sample ID: LCS /4 Matrix: Water Analysis Batch: Analyte Unit D Dil Fac < mg/l 12/04/17 12:12 1 Spike Added Client Sample ID: Lab Control Sample Prep Type: Chloride mg/l LCS LCS Result Qualifier Unit D %Rec Sulfate mg/l Method: 6020A - Metals (ICP/MS) Lab Sample ID: MB /1-A Client Sample ID: Method Blank Matrix: Water Prep Type: Analysis Batch: Prep Batch: MB MB Analyte Result Qualifier RL Calcium < mg/l 12/01/17 08:00 12/04/17 20:30 1 MDL Unit D Prepared %Rec. Limits Analyzed Dil Fac Lab Sample ID: MB /1-A Client Sample ID: Method Blank Matrix: Water Prep Type: Analysis Batch: Prep Batch: MB MB Analyte Result Qualifier RL MDL Unit D Prepared Analyzed Dil Fac Boron < mg/l 12/01/17 08:00 12/05/17 13:49 1 Lab Sample ID: LCS /2-A Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Prep Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Unit D %Rec Limits Calcium mg/l Lab Sample ID: LCS /2-A Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Prep Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Unit D %Rec Limits Boron mg/l Lab Sample ID: DU Client Sample ID: MW-18A Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample DU DU RPD Analyte Result Qualifier Result Qualifier Unit D RPD Limit Calcium mg/l 2 20 TestAmerica Cedar Falls Page 13 of 24 12/6/2017

116 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Method: 6020A - Metals (ICP/MS) (Continued) QC Sample Results TestAmerica Job ID: Lab Sample ID: DU Client Sample ID: MW-18A Matrix: Ground Water Prep Type: Analysis Batch: Prep Batch: Sample Sample DU DU RPD Analyte Result Qualifier Boron mg/l Method: SM 2540C - Solids, Total Dissolved (TDS) Lab Sample ID: MB /1 Matrix: Water Analysis Batch: Analyte MB Result MB Qualifier RL Result Qualifier MDL Unit D RPD Limit Client Sample ID: Method Blank Prep Type: Prepared Analyzed Total Dissolved Solids < mg/l 12/01/17 09:49 1 Lab Sample ID: LCS /2 Matrix: Water Analysis Batch: Analyte Spike Added Unit D Dil Fac Client Sample ID: Lab Control Sample Prep Type: Total Dissolved Solids mg/l Lab Sample ID: DU Matrix: Ground Water Analysis Batch: Analyte Sample Result Sample Qualifier LCS LCS Result Qualifier Unit D %Rec %Rec. Limits Client Sample ID: MW-15A Prep Type: Total Dissolved Solids mg/l DU Result DU Qualifier Unit D RPD RPD Limit Method: SM 4500 H+ B - ph Lab Sample ID: LCS /1 Client Sample ID: Lab Control Sample Matrix: Water Prep Type: Analysis Batch: Spike LCS LCS %Rec. Analyte Added Result Qualifier Unit D %Rec Limits ph SU Lab Sample ID: DU Client Sample ID: MW-21 Matrix: Ground Water Prep Type: Analysis Batch: Sample Sample DU DU RPD Analyte Result Qualifier Result Qualifier Unit D RPD Limit ph 6.9 HF 6.9 SU 0 20 TestAmerica Cedar Falls Page 14 of 24 12/6/2017

117 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR QC Association Summary TestAmerica Job ID: HPLC/IC 3 Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-5B Ground Water 9056A MW-13 Ground Water 9056A MW-14A Ground Water 9056A MW-14A Ground Water 9056A MW-15A Ground Water 9056A MW-15A Ground Water 9056A MW-18A Ground Water 9056A MW-18A Ground Water 9056A MB /3 Method Blank Water 9056A LCS /4 Lab Control Sample Water 9056A Metals Prep Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-13 Ground Water 3010A MW-14A Ground Water 3010A MW-15A Ground Water 3010A MW-18A Ground Water 3010A MW-21 Ground Water 3010A MB /1-A Method Blank Water 3010A LCS /2-A Lab Control Sample Water 3010A DU MW-18A Ground Water 3010A Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-13 Ground Water 6020A MW-14A Ground Water 6020A MW-15A Ground Water 6020A MW-18A Ground Water 6020A MB /1-A Method Blank Water 6020A LCS /2-A Lab Control Sample Water 6020A DU MW-18A Ground Water 6020A Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-13 Ground Water 6020A MW-14A Ground Water 6020A MW-15A Ground Water 6020A MW-18A Ground Water 6020A MW-21 Ground Water 6020A MB /1-A Method Blank Water 6020A LCS /2-A Lab Control Sample Water 6020A DU MW-18A Ground Water 6020A General Chemistry Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-21 Ground Water SM 4500 H+ B TestAmerica Cedar Falls Page 15 of 24 12/6/2017

118 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR QC Association Summary TestAmerica Job ID: General Chemistry (Continued) 3 Analysis Batch: (Continued) Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch LCS /1 Lab Control Sample Water SM 4500 H+ B DU MW-21 Ground Water SM 4500 H+ B Analysis Batch: Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch MW-13 Ground Water SM 2540C MW-14A Ground Water SM 2540C MW-15A Ground Water SM 2540C MW-18A Ground Water SM 2540C MB /1 Method Blank Water SM 2540C LCS /2 Lab Control Sample Water SM 2540C DU MW-15A Ground Water SM 2540C TestAmerica Cedar Falls Page 16 of 24 12/6/2017

119 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Muscatine Power & Water CCR Client Sample ID: MW-5B Lab Sample ID: Date Collected: 11/28/17 12:40 Matrix: Ground Water Date Received: 11/30/17 09: Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Analysis 9056A /04/17 14:12 SAD TAL CF Batch Number Lab 5 6 Client Sample ID: MW-13 Lab Sample ID: Date Collected: 11/28/17 10:40 Matrix: Ground Water Date Received: 11/30/17 09:15 Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Analysis 9056A /04/17 14:27 SAD TAL CF Batch Number Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /04/17 21:28 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /05/17 14:51 SAD TAL CF Analysis SM 2540C /01/17 09:49 SAS TAL CF Client Sample ID: MW-14A Lab Sample ID: Date Collected: 11/28/17 16:15 Matrix: Ground Water Date Received: 11/30/17 09:15 Lab Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Analysis 9056A /04/17 15:12 SAD TAL CF Batch Number Analysis 9056A /04/17 15:27 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /04/17 21:31 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /05/17 15:15 SAD TAL CF Analysis SM 2540C /01/17 09:49 SAS TAL CF Lab Client Sample ID: MW-15A Lab Sample ID: Date Collected: 11/28/17 14:05 Matrix: Ground Water Date Received: 11/30/17 09:15 Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Analysis 9056A /04/17 15:42 SAD TAL CF Batch Number Analysis 9056A /04/17 15:57 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /04/17 21:34 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /05/17 15:18 SAD TAL CF Analysis SM 2540C /01/17 09:49 SAS TAL CF Lab TestAmerica Cedar Falls Page 17 of 24 12/6/2017

120 Lab Chronicle Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Muscatine Power & Water CCR Client Sample ID: MW-18A Lab Sample ID: Date Collected: 11/28/17 17:00 Matrix: Ground Water Date Received: 11/30/17 09: Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Analysis 9056A /04/17 16:12 SAD TAL CF Batch Number Analysis 9056A /04/17 16:27 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /04/17 21:37 SAD TAL CF Prep 3010A /01/17 08:00 JNR TAL CF Analysis 6020A /05/17 15:37 SAD TAL CF Analysis SM 2540C /01/17 09:49 SAS TAL CF Lab Client Sample ID: MW-21 Lab Sample ID: Date Collected: 11/28/17 11:40 Matrix: Ground Water Date Received: 11/30/17 09:15 Prep Type Batch Type Batch Method Run Dilution Factor Prepared or Analyzed Analyst Prep 3010A /01/17 08:00 JNR TAL CF Batch Number Analysis 6020A /05/17 15:06 SAD TAL CF Analysis SM 4500 H+ B /30/17 17:08 BWK TAL CF Lab Laboratory References: TAL CF = TestAmerica Cedar Falls, 704 Enterprise Drive, Cedar Falls, IA 50613, TEL (319) TestAmerica Cedar Falls Page 18 of 24 12/6/2017

121 Accreditation/Certification Summary Client: Muscatine Power & Water TestAmerica Job ID: Project/Site: Muscatine Power & Water CCR Laboratory: TestAmerica Cedar Falls All accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report. Authority Program EPA Region Identification Number Expiration Date AIHA-LAP, LLC IHLAP Georgia State Program 4 IA (OR) Illinois NELAP Iowa State Program * Kansas NELAP 7 E Minnesota NELAP Minnesota (Petrofund) State Program North Dakota State Program 8 R Oregon NELAP 10 IA * Accreditation/Certification renewal pending - accreditation/certification considered valid. TestAmerica Cedar Falls Page 19 of 24 12/6/2017

122 Client: Muscatine Power & Water Project/Site: Muscatine Power & Water CCR Method Summary TestAmerica Job ID: Method Method Description Protocol Laboratory 9056A Anions, Ion Chromatography SW846 TAL CF 6020A Metals (ICP/MS) SW846 TAL CF SM 2540C Solids, Total Dissolved (TDS) SM TAL CF SM 4500 H+ B ph SM TAL CF Protocol References: SM = "Standard Methods For The Examination Of Water And Wastewater", SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates. Laboratory References: TAL CF = TestAmerica Cedar Falls, 704 Enterprise Drive, Cedar Falls, IA 50613, TEL (319) TestAmerica Cedar Falls Page 20 of 24 12/6/2017

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126 Login Sample Receipt Checklist Client: Muscatine Power & Water Job Number: Login Number: List Number: 1 Creator: Homolar, Dana J Question Answer Comment Radioactivity wasn't checked or is </= background as measured by a survey meter. The cooler's custody seal, if present, is intact. Sample custody seals, if present, are intact. The cooler or samples do not appear to have been compromised or tampered with. Samples were received on ice. Cooler Temperature is acceptable. Cooler Temperature is recorded. COC is present. COC is filled out in ink and legible. COC is filled out with all pertinent information. Is the Field Sampler's name present on COC? There are no discrepancies between the containers received and the COC. Samples are received within Holding Time (excluding tests with immediate HTs) Sample containers have legible labels. Containers are not broken or leaking. Sample collection date/times are provided. Appropriate sample containers are used. Sample bottles are completely filled. Sample Preservation Verified. There is sufficient vol. for all requested analyses, incl. any requested MS/MSDs Containers requiring zero headspace have no headspace or bubble is <6mm (1/4"). Multiphasic samples are not present. Samples do not require splitting or compositing. Residual Chlorine Checked. N/A True N/A True True True True True True True True True True True True True True True True True True True True N/A List Source: TestAmerica Cedar Falls TestAmerica Cedar Falls Page 24 of 24 12/6/2017

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128 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-5B SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 3.59 NOTE PROJECT # WELL DEPTH WEATHER Overcast, 59 o F, W 15mph, 29.93" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(ml) DTW TEMP Ph ORP SpecCond Turbidity DO 12: : : : : : : : NOTES 11/28/ ' After Sampling Preservative # of Containers HCl min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HNO 3 NaOH None 1

129 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-13 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW 8.83 NOTE PROJECT # WELL DEPTH WEATHER Overcast, 57 o F, SW wind mph, 29.89" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 10: : : : : : : : : : NOTES 11/28/ ' After Sampling Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

130 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-14A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 57 o F, NNW mph, 30.0 PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 15: : : : : : : : : : : : : : NOTES 11/28/ ' After Sampling Preservative # of Containers DUP min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg HCl HNO 3 1 NaOH None 1

131 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-15A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Overcast, 59oF, 17 mph, 29.96" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 13: : : : : : : : : : : : : : : NOTES 11/28/ ' Sample End Preservative # of Containers min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% HCl or +/-0.2 mg HNO 3 1 NaOH None 1 Limits

132 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-18A SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Clear, 55 o F, NNW 15mph, 30.10" PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE 11/28/ ' TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 16: : : : : : : : NOTES Sample End min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% Limits or +/-0.2 mg After Sampling # of Containers Preservative HCl HNO 3 1 NaOH None 1

133 LOW FLOW SAMPLING FORM DATE 11/28/2017 WELL ID MW-21 SAMPLE DATE / TIME SITE Muscatine Power & Water DTW NOTE PROJECT # WELL DEPTH WEATHER Overcast, 57 o F, W mph, 2PUMP TYPE GeoTech Peristaltic DEPTH TO INTAKE TIME PURGE RATE(ml) VOL REMOVED(mDTW TEMP Ph ORP SpecCond Turbidity DO 11: : : : : : : : NOTES 11/28/ ' Sample End Preservative # of Containers DUP-1 HCl HNO None min ml minimize / /-10 mv +/- 3% +/- 10% +/- 10% or +/-0.2 mg Limits NaOH

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