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Home My WebLink About6512_DukeSutton_UpdatedWQMP_DIN27113_20161115Prepared for 'XNH(QHUJ\3URJUHVV//& 6RXWK&KXUFK6WUHHW &KDUORWWH1RUWK&DUROLQD :$7(548$/,7< 021,725,1*3/$1 /9687721(1(5*<&203/(; 216,7(&2$/&20%867,215(6,'8$/6/$1'),// :LOPLQJWRQ1RUWK&DUROLQD Prepared by *HRV\QWHF&RQVXOWDQWVRI1&3& 6RXWK0LQW6WUHHW6XLWH &KDUORWWH1RUWK&DUROLQD /LFHQVH 1R& 3URMHFW1XPEHU*& 1RYHPEHU BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB BBBBBBBBBBBBBBBBBBBBBBBBBBBB 0DWWKHZ:LVVOHU3* 9LFWRU0'DPDVFHQR3K'3( 1RUWK&DUROLQD/LFHQVHG*HRORJLVW1R 1RUWK&DUROLQD5HJLVWUDWLRQ1R 'DWH1RYHPEHU 'DWH 1RYHPEHU Digitally signed by Matthew Wissler DN: cn=Matthew Wissler, o, ou, email=mwissler@geosyntec.com, c=US Date: 2016.11.14 16:18:52 -05'00'BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB 99999LFLFLFLFLLLWRRRRRRU0'DP K&DURURRROLQD5HJL BBBBBBB ((((((((( 11111RYRYRYRYRYRYRYHPHPHPHPHPHPEHEHEHEHEHEHEHHUUUUU BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB PPPDVDVDVDVDVDVDVFHFHFHFHFHFHFQRQRQRQRQR3K'''''33333((((( VWUDUDDDDDWLWLWLWLWWRQRQRQRQRQRQR 111111RRRRRRR Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 i November 2016 TABLE OF CONTENTS 1 INTRODUCTION............................................................................................................1 1.1 Purpose and Scope......................................................................................................1 1.2 Site Description..........................................................................................................1 1.3 Evaluation of Hydrogeologic Conditions...................................................................1 2 GROUNDWATER MONITORING SYSTEM DESIGN.............................................3 2.1 Monitoring Well Locations, Classification and Installation Schedule.......................3 2.2 Monitoring Well Construction....................................................................................4 2.3 Monitoring Well Development...................................................................................4 2.4 Maintenance and Recordkeeping................................................................................4 2.5 Monitoring Well Decommissioning...........................................................................5 3 GROUNDWATER MONITORING SYSTEM.............................................................6 3.1 Groundwater Constituents and Analytical Procedures...............................................6 3.2 Sampling Schedule and Frequency.............................................................................6 4 GROUNDWATER SAMPLING METHODOLOGY..................................................7 4.1 Groundwater Sample and Water Level Collection.....................................................7 4.2 Sample Preservation and Handling.............................................................................7 4.3 Chain-of-Custody Control..........................................................................................7 4.3.1 Sample Labels..................................................................................................7 4.3.2 Sample Seal......................................................................................................8 4.3.3 Field Logbook..................................................................................................8 4.3.4 Chain-of-Custody Record................................................................................8 4.4 Quality Assurance and Quality Control......................................................................9 4.4.1 Duplicate Samples............................................................................................9 4.4.2 Trip Blank Samples..........................................................................................9 4.4.3 Equipment Blank Samples...............................................................................9 4.4.4 Field Blank Samples ........................................................................................9 4.5 Laboratory Quality Assurance/Quality Control .......................................................10 5 DATA EVALUATION AND REPORTING ...............................................................11 5.1 Evaluation of Water Elevation Data.........................................................................11 5.2 Reporting..................................................................................................................11 6 SURFACE WATER MONITORING PROGRAM....................................................12 7 LEACHATE MONITORING PROGRAM.................................................................13 Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 ii November 2016 8 REFERENCES...............................................................................................................14 LIST OF TABLES Table 1. Monitoring Well Classification, Installation Schedule, and Construction Summary Table 2. Detection Monitoring Analyte Summary LIST OF FIGURES Figure 1. Site Location Map Figure 2. Groundwater Monitoring Plan – Phase 1 Buildout Figure 3. Groundwater Monitoring Plan – Phase 3 Buildout Figure 4. Monitoring Well Construction Detail LIST OF ATTACHMENTS Attachment A: Groundwater Potentiometric Surface Maps Attachment B: Duke Energy Low Flow Sampling Plan Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 1 November 2016 1 INTRODUCTION 1.1 Purpose and Scope This Water Quality Monitoring Plan (Plan) is submitted as an Appendix to the Onsite CCR Landfill Construction Application Report (Application) for a proposed onsite coal combustion residuals (CCR) landfill at Duke Energy Progress, LLC (DEP) L.V. Sutton Energy Complex (Sutton) located near Wilmington, New Hanover County, North Carolina to be submitted to the State of North Carolina Department of Environmental Quality (NCDEQ), Division of Waste Management, Solid Waste Section (SWS). This Plan addresses the specific information required by the North Carolina Solid Waste Management (NCSWM) Rule 15A NCAC 13B .0504 and .1631 through .1637. This Plan also addresses the requirements outlined by the SWS for the environmental sampling, monitoring and electronic reporting at solid waste landfills. 1.2 Site Description Sutton is located in New Hanover County, near Wilmington, North Carolina between the Cape Fear River to the west and the Northeast Cape Fear River to the east. Sutton operated as a three-unit, 575-megawatt coal-fired plant from 1954 until retirement in November 2013. Upon retirement of the coal-fired units in November 2013, a new 625-megawatt gas-fired combined-cycle unit began operating. There are two CCR basins located at Sutton: (i) the 1971 Basin, and (ii) the 1984 Basin. The approximate area of each basin is 54 and 82 acres, respectively. Other notable features at the site include the lay of land area (LOLA) previously referred to as the Former Ash Disposal Area (FADA), located to the south of the 1971 Basin, the cooling pond (also referred to as Lake Sutton), to which the public have access and a discharge canal that conveys water from the plant to the cooling pond. DEP intends to remove CCR from the 1971 and 1984 Basins and place it within a proposed onsite lined CCR landfill. A site location map showing the proposed onsite CCR landfill footprint is presented on Figure 1. 1.3 Evaluation of Hydrogeologic Conditions A detailed hydrogeologic evaluation was performed to collect the information required by the NCSWM Rule 15A NCAC 13B .0504(1)(c). This evaluation was submitted as part of the Site Suitability Report as Volume II – Hydrogeologic Report [Geosyntec, 2015]. The results of the hydrogeologic investigations provided the design basis of the groundwater monitoring system presented herein as required by NCSWM Rule 15A NCAC 13B .1631. The conclusions from the hydrogeologic evaluation include the following: Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 2 November 2016 x The uppermost aquifer is comprised of the surficial aquifer and the Upper Peedee Aquifer. The uppermost aquifer extends from the water table which is encountered between 9.5 and 12 feet above the North American Vertical Datum of 1988 (NAVD 88) to approximately -35 feet NAVD 88. x A discontinuous confining unit, regionally identified as the Peedee Confining Unitwas encountered only in the northern portion of Sutton between the surficial aquifer and the Upper Peedee Aquifer between -15 and -20 feet NAVD 88. x Groundwater flow within the surficial aquifer is generally toward the west within the southern portion of the proposed CCR landfill and to the east within the northern portion of the proposed CCR landfill. Potentiometric surface maps from January and March 2015, extracted from Geosyntec [2015] are included in Attachment A for reference. x The horizontal groundwater flow velocity within the Upper Peedee Aquifer ranges from 26.3 and 1,315 feet per year (ft/yr) based upon the computed site specific hydraulic conductivity geometric mean of 30 feet per day (ft/day) measured hydraulic gradients and an assumed 30 percent porosity. x An upward vertical groundwater gradient was observed between the Upper Peedee Aquifer and the underlying Peedee Aquifer. x A groundwater extraction system will be installed at the site according to the Settlement Agreement between NCDEQ and DEP dated 29 September 2015 to arrest offsite migration of CCR related groundwater. The extraction well system consists of nine extraction wells (SUT-EW-1 through SUT-EW-9). Two additional supply wells will be installed (LF-CWW-1A and LF-CWW-1B) to supply water for dust suppression and compaction purposes during landfill construction. The steady state groundwater surface induced by the groundwater extraction and supply wells was simulated with a groundwater model. x A simulated future condition (i.e. post Phase 1 landfill buildout, stormwater management system construction and groundwater extraction system installation) potentiometric surface map is also included on Figure 2. x A simulated future condition (i.e. post Phase 3 landfill buildout, stormwater management system construction and groundwater extraction system installation) potentiometric surface map is also included on Figure 3. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 3 November 2016 2 GROUNDWATER MONITORING SYSTEM DESIGN 2.1 Monitoring Well Locations, Classification and Installation Schedule Background and detection monitoring wells will be installed to monitor the water quality of the surficial aquifer as outlined in NCSWM Rule 15A NCAC 13B .0601 and .1631. The proposed groundwater monitoring system following Phase 1 landfill buildout is presented on Figure 2 and the proposed groundwater monitoring system following Phase 3 buildout is presented on Figure 3. Placement and designation of the monitoring wells was based on the hydrogeologic information collected during the site initial hydrogeologic investigation and summarized in Section 1.3 of this Plan and consistent with the regulations outlined in 15A NCAC 02L .0107(b) and 15A NCAC 02L .0108. As shown in the current measured potentiometric surface maps provided in Attachment A, groundwater flow in the uppermost aquifer is generally toward the west within the southern portion of the proposed CCR landfill and to the east within the northern portion of the proposed CCR landfill under current conditions. In addition, after the groundwater extraction system is installed along the eastern property boundary, groundwater flow will generally be to the northwest in the northern portion of the proposed landfill and to the southeast in the southern portion of the proposed landfill. It is important to note that the groundwater monitoring system was designed based upon current and proposed future conditions; however, the seasonal high water table (SHWT) surface is provided in Sheet 14 of the Sutton Onsite CCR Landfill Construction Application Report, dated August 2015, for reference. Modifications to the configuration of the detection and background monitoring wells may be necessary in the future as conditions transition to the SHWT conditions (following abandonment of neighboring production wells) and once the measured post landfill construction/groundwater extraction system groundwater elevations become available. Background (upgradient) wells will be installed on the upgradient side of the landfill footprint at least 75 feet from the property boundary. Detection (downgradient) wells will be installed at the review boundary on the downgradient side of the proposed landfill footprint. The compliance boundary is 250 feet from the waste boundary or 50 feet from the property line, whichever is nearer to the waste boundary. This configuration of background and detection wells will allow for evaluation of background groundwater quality and the groundwater quality passing the waste boundary (or zone of discharge) of the proposed CCR landfill. The proposed CCR landfill will be constructed in three phases (Phases 1 through 3) as presented in the Application Drawings. Therefore, a phased sequence for well installation was developed and is outlined in Table 1 and on Figures 2 and 3. The screened intervals and completion depths of the monitoring wells are based on design elevations of the side slopes of the CCR landfill and adjacent berms. The monitoring well installation locations surface Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 4 November 2016 elevations provided may change based upon site configuration/conditions at the time of installation. A total of fourbackground and fourdetection wells will be installed during Phase 1 landfill construction. Phase 2 landfill construction will include the installation of three detection wells. Finally, Phase 3 will include the installation of two background wells and one detection well. The background and detection monitoring wells associated with each phase are shown in Table 1. 2.2 Monitoring Well Construction All proposed wells will be screened within the uppermost aquifer between 0 and -10 NAVD 88 (above the discontinuous Peedee confining unit) and constructed, developed and labeled according to applicable North Carolina Well Construction Standards as specified in 15A NCAC 02C .0108. A detail of the proposed well construction is provided on Figure 4. A soil boring log will be prepared by the geologist or engineer by visually inspecting drill cuttings directly from the auger flights, samples from a standard penetration test (SPT) split-spoon sampler, or other sampling technique to place the screened portion of the well at the appropriate interval. A State of North Carolina registered land surveyor will measure the horizontal location of each monitoring well, to the nearest 0.1 foot NAD83, as well as the elevation of the ground surface top of the inner well casing to the nearest 0.01 foot, NAVD88. 2.3 Monitoring Well Development The monitoring wells will be developed to remove fine grained particles present in the well filter pack due to well construction activities to ensure the well has an adequate hydraulic connection with the aquifer. Development will be performed no sooner than 24 hours after well construction and will be completed with a submersible pump and surge block if needed (or other approved method). In general, each well will be developed until visually sediment- free water with stabilized field parameters (i.e., temperature, pH, turbidity and specific conductance) is obtained. Well development equipment (e.g., pumps, surge blocks) and any additional equipment that contacts subsurface formations will be decontaminated prior to onsite use, between consecutive onsite uses, and/or between consecutive well installations. The purge water will be disposed of as directed by DEP. 2.4 Maintenance and Recordkeeping Monitoring wells will be used and maintained in accordance with design specifications throughout the life of the monitoring program. Routine well maintenance will include inspection and correction/repair of, as necessary, identification labels, concrete aprons, locking caps and locks, and access to the wells. Should it be determined that background or detection monitoring wells no longer provide samples representative of the quality of Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 5 November 2016 groundwater passing the relevant point of compliance, the SWS will be notified. The owner or owner’s representative will re-evaluate the monitoring network, and provide recommendations to the SWS for modifying, rehabilitating, decommissioning, or installing replacement or additional monitoring wells, as appropriate. Laboratory analytical results will be submitted to the SWS semi-annually. Analytical data, calculations, and other relevant groundwater monitoring records will be kept throughout the active life of the facility and the post-closure care period, including notices and reports of any North Carolina (2L) Groundwater Protection Standard (15A NCAC 02L .0202) exceedances, resampling notifications, and resampling results. 2.5 Monitoring Well Decommissioning Should the need arise during the monitoring period, monitoring wells will be decommissioned in accordance with 15A NCAC 02C .0113 (d) using the methods outlined below. Monitoring wellsthat are located within the future landfill footprint (including the wells currently installed within the footprint of the landfill) will be overdrilled to remove well construction materials, and grouted with a cement-bentonite grout. Monitoring wells that will potentially interfere with access and construction activities will be grouted in place without overdrilling, with a cement-bentonite grout and removing surface features, such as concrete aprons, protective casings, and stick-ups. In each case, the bentonite content of the cement-bentonite grout shall be approximately 5 percent. A tremie pipe will be used to place grout continuously from the bottom of the borehole/monitoring well upward. If a well becomes damaged during the monitoring period of the landfill, the monitoring well will be decommissioned with the procedures described above. Approval from the SWS will be sought prior to the decommissioning of any monitoring well. For each monitoring well decommissioned, the following information will be provided to the SWS in a report: the monitoring well name, a description of the procedure by which the monitoring well was decommissioned, the date when the monitoring well was considered to be taken out of service, and the date when the monitoring well was decommissioned. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 6 November 2016 3 GROUNDWATER MONITORING SYSTEM The groundwater monitoring program will consist of collecting groundwater samples on a semi-annual basis to monitor the groundwater quality upgradient and downgradient of the landfill. The groundwater constituents, analytical procedures, and sampling schedule and frequency are summarized below. 3.1 Groundwater Constituents and Analytical Procedures A NCDEQ certified laboratory will be utilized for analysis of the groundwater samples. Analyses will be performed in accordance with United States Environmental Protection Agency (USEPA) SW 846 methods in accordance with the USEPA guidance document [USEPA, 1997]. For available constituents, method numbers and reporting limits to be used will be those listed in the 27 October 2006, SWS memorandum [SWS, 2006] and 23 February 2007, addendum [SWS, 2007]. The proposed monitoring parameters are listed in Table 2, along with the proposed analytical methods and reporting limits. These analytes represent the required parameters for North Carolina CCR landfills with NCDEQ SWS. Alternate SW 846 methods may be used if they have the same or lower reporting limit. The laboratory must report any detection of any constituent even if it is detected below the solid waste reporting limit (as revised in the 27 October 2006, memorandum [SWS, 2006] and 23 February 2007, addendum [SWS, 2007]). 3.2 Sampling Schedule and Frequency In accordance with NCSWM Rule 15A NCAC 13B .1633, baseline sampling will include all new background and detection wells installed during Phase 1. These same wells will be independently sampled for the parameters summarized in Table 2 on four occasions prior to CCR placement in the newly constructed landfill unit within the initial semi-annual sampling event. Collectively, the baseline dataset will constitute the first semi-annual sampling event and will provide a background dataset for the future statistical evaluation of detection data. This protocol will also be followed for Phases 2 and 3 of the landfill once they are constructed. Detection monitoring will be initiated following initial CCR placement and will include the semi-annual collection of one sample from each background and detection well and analysis for the detection monitoring constituents summarized in Table 2. The semi-annul sampling is proposed to occur in March and October which coincides with the Sutton National Pollutant Discharge Elimination System (NPDES) groundwater sampling. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 7 November 2016 4 GROUNDWATER SAMPLING METHODOLOGY Groundwater samples will be obtained and analyzed semi-annually using methods consistent with NCSWM Rule 15A NCAC 13B .1632,Solid Waste Section Guidelines for Groundwater, Soil, and Surface Water Sampling [SWS, 2008] and the NCDEQ approved Duke Energy Low Flow Sampling Plan [Duke Energy, 2015] which is provided in Attachment B. The following sections provide specific details regarding sample collection, sample handling, quality control and chain of custody procedures. 4.1 Groundwater Sample and Water Level Collection If non-dedicated sampling equipment is utilized, groundwater samples will initially be collected from the background wells followed by sample collection from detection wells. Static groundwater levels will be collected, to the nearest 0.01 foot, using an electronic water level meter at each monitoring well prior to purging and groundwater sampling. Groundwater elevations will be calculated by subtracting the groundwater level as measured from top of casing from the elevation of the top of casing. Water levels from all background and detection wells will be collected within a 24-hour period to facilitate evaluation of the rate and direction of groundwater flow for each monitoring event. The purging method(s) selected for monitoring well sampling (either low flow or volume averaging procedures) will be followed as outlined in Duke Low Flow Sampling Plan [Duke Energy, 2015]. If non-dedicated sampling equipment is utilized, decontamination and tubing replacement procedures will be followed as specified in Duke Low Flow Sampling Plan [Duke Energy, 2015]. 4.2 Sample Preservation and Handling The samples will be packed into pre-chilled, ice-filled coolers following collection and either hand-delivered or shipped overnight by a commercial carrier to a North Carolina certified laboratory under chain-of-custody control for analysis. Sample preservation methods will be used to retard biological action and hydrolysis, as well as to reduce sorption effects. These methods will include chemical preservation (if the analytical method requires), cooling/refrigeration at four degrees Celsius and protection from light. 4.3 Chain-of-Custody Control Chain-of-custody procedures will be followed and allow for tracing sample possession and handling from the time of field collection through laboratory analysis. The chain-of-custody program includes sample labels, sample seal, field logbook, and chain-of-custody record. 4.3.1 Sample Labels Labels sufficiently durable to remain legible when wet must contain the following information: Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 8 November 2016 x Site and sample identification number; x Monitoring well number or other location; x Date and time of collection; x Name of collector; x Parameters to be analyzed; and x Preservative, if applicable. 4.3.2 Sample Seal The shipping container will be sealed with tape to detect if the samples have been disturbed during transport to the laboratory. The tape is labeled with instructions to notify the shipper if the seal is broken prior to receipt at the laboratory. 4.3.3 Field Logbook The field logbook will contain sheets documenting the following information: x Identification of the well; x Well depth; x Field meter calibration information; x Static water level depth and measurement technique; x Purge volume (given in gallons); x Time well was purged; x Date and time of collection; x Well sampling sequence; x Types of sample containers used and sample identification numbers; x Preservative used; x Field analysis data and methods; x Field observations on sampling event; x Name of collector(s); and x Climatic conditions including air temperatures and precipitation. 4.3.4 Chain-of-Custody Record The chain-of-custody record is required for tracing sample possession from time of collection to time of receipt at the laboratory. A chain-of-custody record will accompany each individual shipment. The record will contain the following information: x Sample destination and transporter; x Sample identification numbers; x Signature of collector; x Date and time of collection; Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 9 November 2016 x Sample type; x Identification of well; x Number of sample containers in shipping container; x Parameters requested for analysis; x Signature of person(s) involved in the chain of possession; x Inclusive dates of possession; and x Internal temperature of shipping container upon opening in laboratory (noted by the laboratory). A copy of the completed chain-of-custody form will accompany the shipment and will be returned to the shipper after the shipping container reaches its destination. The chain-of- custody record will also be used as the analysis request sheet. 4.4 Quality Assurance and Quality Control The quality control (QC) samples detailed in the following sections will be collected to demonstrate the quality of the laboratory data and field collection methods. 4.4.1 Duplicate Samples A duplicate sample shall be obtained from a different well for each event. The associated well ID will be noted on the field logs. The sample will only be identified on the chain-of-custody and jar labels as “Duplicate”. 4.4.2 Trip Blank Samples No trip blanks are anticipated since volatile organic compounds are not tested for as a part of the routine sampling program. 4.4.3 Equipment Blank Samples At least one equipment (rinsate) blank shall be collected for each sampling event that requires field decontamination (i.e. if non-dedicated sampling equipment is used). The equipment blank shall be collected from non-dedicated equipment after use at a rate of one equipment blank per day or per 20 groundwater samples, whichever is more frequent. The equipment blank is prepared by filling the decontaminated sampling device with deionized water and then transferring it to an appropriate sample container. This container is then handled in the same manner as other samples. Equipment decontaminated in both the field and the office will be utilized for equipment blanks. 4.4.4 Field Blank Samples A field blank will be collected in the event that weather or environmental conditions are unstable in the vicinity of the well while it is being sampled (i.e., heavy winds, rain, and heavy equipment operation). Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 10 November 2016 A field blank may be collected and analyzed during each monitoring event to verify that the sample collection and handling process has not affected the quality of the samples. The field blank will be prepared in the field and exposed to the sampling environment. As with all other samples, the time of the blank exposure will be recorded so that the sampling sequence is documented. The field blank will be analyzed for the same list of constituents as the groundwater samples. The assessment of blank analysis results will be in general accordance with USEPA guidance documents [USEPA, 1993 and 1994]. No positive sample results will be relied upon unless the concentration of the compound in the sample exceeds 10 times the amount in any blank for common laboratory contaminants, or five times the amount for other compounds. If necessary, resampling will be performed to confirm or refute suspect data; such resampling will occur within the individual compliance monitoring period. Concentrations of any contaminants of interest found in the blanks will be used to qualify the groundwater data. Any compound detected in the sample, which was also detected in any associated blank, will be qualified “B” when the sample concentration is less than five times the blank concentration. For common laboratory contaminants, the results will be qualified “B” when the reported sample concentration is less than 10 times the blank concentration. The “B” qualifier designates that the reported detection is considered to represent cross- contamination and that the reported constituent is not considered to be present in the sample at the reported concentration. 4.5 Laboratory Quality Assurance/Quality Control The contracted laboratory is given the flexibility to use any QA/QC program appropriate for the specified analysis. The laboratory shall provide verification of this programs use with the results of the sample analyses. A North Carolina certified groundwater laboratory, as specified in 15A NCAC 2H .0800, shall perform the required testing. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 11 November 2016 5 DATA EVALUATION AND REPORTING In accordance with NCSWM Rule 15A NCAC 13B .1632, evaluation of the water elevation and water quality data will be completed following each semi-annual sampling event using statistical methods. The sections below outline the evaluation procedures and the reporting procedures. 5.1 Evaluation of Water Elevation Data Evaluation of the water elevation data will be performed to evaluate the direction and rate of groundwater flow for each semi-annual sampling event. 5.2 Reporting In accordance with NCSWM Rule 15A NCAC 13B .1632, the reporting content and schedule will consist of a report following each semi-annual sampling event. A semi-annual report will be prepared and submitted to the SWS within 120 days of each semi-annual sampling event. The report will include the following elements: x A summary the groundwater sampling event including: field observations relating to the conditions of the monitoring wells, field data, laboratory data, statistical analysis, sampling methodologies and quality assurance and quality control data; and x Groundwater elevation map which summarizes the rate and direction of groundwater flow at the CCR unit and calculations of groundwater flow rate of any constituents that exceed applicable groundwater standards. The submittals will be consistent with the requirements summarized in the SWS memo: Groundwater, Surface Water, Soil, Sediment, and Landfill Gas Electronic Document Submittal dated 5 November 2014 [SWS, 2014] and will be accompanied by a signed Environmental Monitoring Data Form. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 12 November 2016 6 SURFACE WATER MONITORING PROGRAM No effects upon surface water from the CCR Landfill are anticipated. Therefore no surface water monitoring is proposed as specified in 15A NCAC 13B .0602. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 13 November 2016 7 LEACHATE MONITORING PROGRAM Leachate monitoring will be conducted on a semi-annual basis according to 15A NCAC 13B .1626(12). A composite leachate sample will be collected from the leachate storage tank or sample port installed within the leachate distribution main and analyzed for the parameters summarized in Table 2. The composite leachate sample collected from the leachate tank system shown on Figures 2 and 3 shall be collected from an in-line sampling point. The inline sampling valve is linked to each of the leachate tanks; therefore, the sample collected from this inline sampling valve will be a composite leachate sample. The leachate sample will be labeled with a sample ID “L-1”. The leachate sample will be analyzed for the list of constituents in Table 2 and the field parameters pH, specific conductivity, and temperature. The results of the analysis of the leachate data will be submitted to the SWS at least semi-annually in conjunction with the groundwater data, but will not be compared to the 2L water quality standards that groundwater samples are. Leachate samples will adhere to the same protocols for collection, preservation, custody, documentation and analysis as applied to groundwater in preceding Section 4. Water Quality Monitoring Plan L.V. Sutton Energy Complex Onsite CCR Landfill GC5770\WQMP Sutton CCR LF_11-14-2016 14 November 2016 8 REFERENCES Duke Energy (2015). Low Flow Sampling Plan, Duke Energy Facilities, Ash Basin Groundwater Assessment Program, North Carolina, dated 10 June 2015. Geosyntec Consultants, Inc. (2015). Site Suitability Report, Volume II – Hydrogeologic Report, L.V. Sutton Plant, Project Number GC5770. SWS (2006). New Guidelines for Electronic Submittal of Environmental Monitoring Data, memo dated 27 October 2006, North Carolina Department of Environment and Natural Resources, Division of Waste Management, Solid Waste Section. SWS (2007). Addendum to October 27, 2006, North Carolina Solid Waste Section Memorandum Regarding New Guidelines for Electronic Submittal of Environmental Monitoring Data, memo dated 23 February 2007, North Carolina Department of Environment and Natural Resources, Division of Waste Management, Solid Waste Section. SWS (2008). Guidelines for Groundwater, Soil, and Surface Water Sampling, North Carolina Department of Environment and Natural Resources, Division of Waste Management, Solid Waste Section, Revised April 2008. SWS (2014). Groundwater, Surface Water, Soil, Sediment, and Landfill Gas Electronic Document Submittal, memo dated 5 November 2014, North Carolina Department of Environment and Natural Resources, Division of Waste Management, Solid Waste Section. USEPA (1997). SW-846 Methods for Valuating Solid Waste, Physical/Chemical Methods, Final Update III, United States Environmental Protection Agency. TABLES Table 1: Monitoring Well Classification, Installation Schedule, and Construction Summary Monitoring Well Designation Well Classification Installation Schedule Anticipated Land Surface Elevation (feet NAVD 88) Monitoring Well Screened Interval (ft. BLS)(1)(2) BMW-1 Background Phase 1 26.16 10-20 BMW-2 Background Phase 1 18.84 3-13 BMW-3 Background Phase 1 24.46 9-19 BMW-4 Background Phase 1 16.00 2-12 DMW-1 Detection Phase 1 22.66 7-17 DMW-2 Detection Phase 1 21.50 6-16 DMW-3 Detection Phase 1 21.60 7-17 DMW-4 Detection Phase 1 28.11 15-25 DMW-5 Detection Phase 2 19.05 10-20 DMW-6 Detection Phase 2 22.58 7-17 DMW-7 Detection Phase 2 21.68 6-16 BMW-5 Background Phase 3 15.14 1-11 BMW-6 Background Phase 3 19.99 7-17 DMW-8 Detection Phase 3 19.11 6-16 Note(s): [1] ft. BLS – feet below land surface based upon designed land surface elevation [2] Monitoring screen interval is approximate and should be verified during well installation to place the well screen across the water table. Table 2: Detection Monitoring Analyte Summary Constituent Analytical Methods(s) 15A NCAC 2L Groundwater Standard (μg/L) De t e c t i o n M o n i t o r i n g C o n s t i t u e n t s Arsenic (Total) EPA 200.8 10 Barium (Total) EPA 200.7 700 Boron (Total) EPA 200.7 700 Cadmium (Total) EPA 200.8 2 Chloride EPA 300.0 250,000 Chromium (Total) EPA 200.7 10 Copper (Total) EPA 200.7 1,000 Fluoride EPA 300.0 2,000 Iron (Total) EPA 200.7 300 Lead (Total) EPA 200.8 15 Manganese (Total) EPA 200.7 50 Mercury (Total) EPA 245.1 1 Nickel (Total) EPA 200.7 100 Nitrate (as Nitrogen) EPA 300.0 10,000 Selenium (Total) EPA 200.8 20 Silver (Total) EPA 200.7 20 Sulfate EPA 300.0 250,000 TDS SM2540C 500,000 Zinc (Total) EPA 200.7 1,000 Note(s): [1] μg/L – micrograms per liter [2] N/A – not available FIGURES Cooling Pond 1984 Basin 1971 Basin Cape Fear River Northeast Cape Fear River Lay of Land Area (LOLA) Approximate Onsite CCR Landfill Footprint SITE LOCATION MAP L.V. Sutton Energy Complex Wilmington, North Carolina Figure 1 P:\ G I S \ P r o j e c t s \ D \ D u k e \ L V S u t t o n - W Q M P \ m x d s ; J C O L L E Y CHARLOTTE, NC OCTOBER 2016 ³ Notes: 1. Service Layer Credits: Sources: Esri, HERE, DeLorme, USGS, Intermap, increment P Corp., NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), TomTom, MapmyIndia, © OpenStreetMap contributors, and the GIS User Community 0.5 0 0.5 10.25 Miles Legend Property Boundary Cooling Pond Lay of Land Area (LOLA) Basin Boundary W W W W W W W W W W W W W W W WW W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WWWW W W W W W W W W W W W W W W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W WW W W W W W W WW W W X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X RO C K DIR T 11. 2 10. 6 -0 . 3 0.1 0.1 0.3 0.1 -0. 5 27. 6 27 . 5 26 . 8 34. 3 33 . 5 33. 7 33. 7 33. 7 33. 1 35 . 0 3 5 . 8 27. 2 28. 9 34. 7 27 . 5 27 . 3 29. 7 34. 4 33. 8 33. 5 33. 533. 2 33. 0 34. 1 34 . 9 34. 8 32.9 34 . 4 34 . 2 34 . 1 31 . 9 32. 5 33. 0 33. 4 33 . 1 33. 6 33. 7 33 . 7 33. 7 45. 3 45 . 8 46. 6 47 . 4 46. 6 38. 4 31. 7 40. 9 43. 0 33 . 2 30 . 6 26. 6 27 . 0 26 . 5 28 . 7 29. 3 22. 9 20 . 5 (e s t . ) 19 . 6 (e s t . ) 32. 5 34. 5 35 . 4 44. 9 33 . 7 33 . 8 34 . 3 34 . 7 34. 6 42 . 5 42. 7 42. 5 42. 7 25 . 9 (es t . ) 26. 8 (e s t . ) 28 . 4 14 . 5 19 . 3 13 . 5 13. 5 13. 2 13. 2 13. 6 13. 4 13. 4 36. 9 36 . 7 38. 8 41. 1 40. 9 40 . 5 40. 8 42. 4 42. 7 43. 3 CH A N N E L W . E . = 36. 1 4 / 1 7 / 1 4 52. 8 53 . 0 51. 2 51. 4 51. 5 51 . 6 50 . 7 51. 6 41. 1 40. 8 32. 8 36. 0 8.8 8.5 8.4 8.5 0.7 19.018.718.2 19. 5 26. 9 21. 8 12. 9 18. 5 12. 4 17. 1 23 . 4 20 . 8 17. 4 17 . 5 21. 4 22. 6 21 . 3 23. 4 14. 9 12.7 14.3 13.3 13.0 24. 8 33. 8 19. 0 16.9 21. 0 16. 9 32. 6 19. 0 13. 9 23. 0 24 . 1 23. 4 17. 4 22. 6 16 . 4 20 . 4 20. 417. 2 17 . 4 14 . 3 28 . 7 15. 3 15 . 4 15. 6 15.5 16.7 16. 4 16. 5 16. 4 15. 9 19 . 0 15 . 6 15. 7 15 . 8 17. 1 16 . 7 17. 1 16 . 5 17. 3 17 . 5 35. 2 20. 8 20. 3 23 . 0 23 . 2 17 . 7 17.6 19.3 21. 1 20. 8 24.7 25.4 27 . 1 24. 7 24. 8 18 . 9 24. 7 26. 1 16.6 24. 8 29. 1 14 . 6 14. 2 15 . 0 14. 5 15 . 2 15. 3 16.2 14. 9 15. 0 24. 2 13. 7 17. 422 . 9 24. 9 17 . 8 19. 4 19.4 15. 3 26 . 2 23. 4 15. 1 14 . 3 16. 9 17 . 3 16. 5 14. 8 19. 1 23. 0 19. 5 19. 715.4 38 . 5 37 . 6 39. 1 38 . 9 24. 4 24. 4 32. 4 24. 3 39. 3 35. 233 . 0 34 . 6 25. 5 34. 6 19. 5 23. 5 24 . 3 21. 3 18. 5 17. 6 17. 6 17. 1 17. 0 17. 3 14. 3 14. 4 15.8 14. 9 13. 6 13 . 6 15 . 5 16. 8 17 . 4 17. 8 18 . 4 18. 4 18. 3 18. 6 19. 0 18 . 6 18. 7 18 . 3 18 . 8 18. 9 21. 1 20 . 7 22. 5 22. 9 19 . 4 18. 7 19. 2 31. 0 28 . 8 27 . 5 27. 0 28. 8 21. 3 17.2 23. 0 32 . 6 20 . 217. 7 16. 5 16. 8 37 . 2 34. 7 33. 1 22. 5 23. 6 23. 2 19. 3 18. 7 22. 2 21. 8 19. 821. 4 20.6 29. 328. 6 29 . 2 21. 2 21.2 21 . 6 19. 5 21. 4 20.819.3 18.9 15 . 4 14.8 14.7 30. 3 29. 2 24 . 4 18 . 8 22 . 3 20 . 5 21. 2 27 . 1 17. 0 15.8 0.9 1.3 1.1 1.1 21.0 14 . 6 13 . 2 15.4 19.2 19.5 11. 3 11. 5 11. 0 11. 8 11. 8 11 . 9 12. 7 15. 1 14. 4 18 . 6 19 . 2 13. 1 12. 5 12. 8 13. 2 12. 6 12. 5 15.1 10. 9 24. 6 17. 6 23. 0 24. 9 12. 3 12 . 4 12. 5 23. 0 18. 4 12. 7 12. 6 12. 8 14. 9 16. 7 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X XPILE PIL E 12. 6 12. 4 -0. 2 0.5 -0. 5 0.5 30. 6 28 . 9 27. 8 27. 8 27 . 9 32. 4 32. 8 33. 3 29 . 0 28. 5 3 1 . 4 33. 7 33. 4 33 . 0 33 . 4 33 . 5 33 . 4 33. 8 34. 8 38. 8 34. 3 34 . 1 26 . 9 25. 8 32 . 6 32. 7 33. 0 33. 3 33. 8 33. 5 33. 3 45. 0 40. 6 39. 3 31 . 8 33 . 5 27. 6 25 . 3 25. 1 21. 6 31. 4 32. 6 33 . 1 33. 4 35. 1 35. 2 45. 233. 533 . 2 33. 6 34. 6 33. 7 33. 7 34 . 8 16. 7 17. 3 17 . 7 18. 5 14 . 9 14. 6 13. 5 13. 4 13. 5 13. 3 13 . 1 13. 7 18. 7 13. 3 40. 0 38. 8 40 . 4 40 . 5 38. 1 44. 9 43 . 1 41. 4 40. 7 40. 4 40. 3 40 . 4 42. 7 42 . 3 43. 0 52. 5 52. 6 52. 2 52. 2 51. 5 51 . 5 51. 0 50. 9 40 . 8 41 . 0 41. 2 40. 9 42 . 7 41. 2 19 . 1 18. 6 42 . 7 42. 4 45. 5 9.5 8.2 19 . 0 18.9 18.418.9 19 . 0 11. 4 12. 9 11. 3 9.0 48. 7 28. 8 15. 5 14 . 7 14 . 3 14. 7 19. 3 19. 1 14. 7 19. 0 21. 1 23. 0 22.9 12 . 6 12. 5 29. 0 41. 0 23. 0 27.5 32. 5 31. 4 17.616.7 17.1 19 . 0 16 . 8 19 . 5 21. 1 21. 4 15. 3 30. 6 29 . 2 24. 8 21. 4 22 . 1 16.3 14. 6 13 . 9 19. 7 18. 6 14. 0 18. 2 13. 2 24.6 17. 3 22. 7 28. 9 15. 8 16. 8 15 . 9 16. 3 17 . 0 16. 8 16 . 617. 0 17 . 4 27. 4 24. 5 36. 5 28. 7 21. 5 17.2 31 . 6 28. 6 15.2 14.8 14. 3 23. 8 25. 1 15 . 6 15. 5 25. 7 21 . 4 30. 3 29 . 0 22. 9 19 . 3 17. 2 15. 2 15. 0 15. 0 15 . 3 16.4 16.5 13 . 9 23 . 0 23. 1 18. 5 19. 1 21. 6 21. 0 19 . 0 18. 7 14 . 4 8.7 10. 1 20. 7 20. 9 21. 2 22. 6 20. 5 22. 3 18. 4 38. 5 25 . 3 31. 5 36 . 9 3 3 . 3 19. 3 16 . 9 16. 5 17 . 517. 2 17 . 4 17. 0 16. 8 17. 0 14. 7 14. 8 22. 5 15. 4 13. 6 13. 9 13. 6 14. 1 14. 4 28. 5 17. 8 17 . 2 1.7 18. 8 18. 9 19. 1 18. 5 16 . 6 31. 0 23. 8 30. 3 22 . 4 17. 3 19. 4 19. 4 21 . 2 23. 3 24.5 18. 2 20. 9 17. 3 17. 5 17 . 1 17. 0 21. 3 31. 3 34 . 4 25. 1 17.6 16. 9 21. 8 14. 8 33 . 7 14 . 6 0.9 1.0 1.0 29. 0 29 . 5 27. 1 27. 1 21 . 0 12. 1 12. 8 13. 0 12 . 8 34 . 4 17. 5 12. 7 12. 4 12. 3 25.7 15.7 22. 3 16. 6 14. 8 OE OE OE OE OE OE OE OE OE OE OEOE OE OEOEOEOEOEOEOEOEOEOEOE OE OEOEOEOEOEOEOEOEOEOE OE OEOEOEOEOEOEOEOEOE OE OE OEOEOEOEOEOEOEOE W.E . = 2 5 . 4 ' 5/2 9 / 1 4 3 0 " C M P 11. 2 10. 2 9.3 9.2 9.1 9.7 11. 5 11. 5 11. 3 7.8 14. 9 12. 3 12. 5 12. 7 12. 6 13. 0 13. 1 13. 3 13. 3 11. 0 9.7 9.2 11. 4 10. 7 10. 6 9.3 9.7 7.5 8.3 10. 6 14. 6 10. 6 8.9 10. 5 13. 1 11. 5 11. 0 11. 0 11. 0 9.8 9.0 9.2 8.6 10. 49.3 9.1 9.3 9.4 9.5 9.6 9.4 OE OE OEOEOEOEOEOEOEOE OE OE OE OE OE OEOEOEOEOEOEOEOEOEOEOE OE OE OE OE OEOEOEOEOEOEOEOEOEOE OE OE OE OE OEOEOEOEOEOEOEOEOE OE OE OE OE OE OEOEOEOEOEOEOEOE 30 30 30 30 20 20 20 20 20 20 2 0 20 20 20 20 2 0 2 0 10 50 40 4 0 4 0 40 40 40 30 3 0 30 30 30 3 0 30 20 20 20 20 30 30 3 0 30 30 30 30 3 0 30 3 0 10 3030 30 3 0 10 10 20 20 20 2 0 20 20 20 2 0 2020 20 20 20 20 20 20 20 2 0 20 20 20 20 20 20 2 0 20 20 20 20 30 20 20 20 20 2 0 20 2 0 2 0 3 0 20 20 20 20 20 2 0 10 10 10 10 0 20 50 40 2 0 40 40 40 40 40 4 0 40 40 4 0 40 40 20 40 40 2 0 30 30 30 30 30 10 30 3 0 30 30 1 0 3 0 10 30 3030 30 3 0 20 20 20 50 20 20 20 20 40 20 20 2 0 20 2 0 20 3 0 3 0 3 0 3 0 30 40 30 30 40 30 30 30 30 10 40 20 20 2 0 40 20 20 40 20 2 0 20 20 2020 40 20 20 2 0 20 20 40 20 20 20 20 20 2 0 20 30 2 0 20 2 0 30 20 20 20 20 30 20 20 20 1 0 30 10 50 50 40 30 4 0 40 40 2 0 40 40 40 40 40 40 40 40 40 40 40 20 40 40 4 0 40 40 30 30 30 30 30 3 0 2 0 30 30 3 0 3 0 3 0 30 20 20 20 20 20 2 0 20 10 20 20 20 20 10 20 20 0 10 0 1 0 10 10 10 10 10 10 1 0 1 0 1 0 10 10 30 30 25 20 20 3 0 15 10 10 10 15 1 5 20 30 2 5 35 10 1 0 15 1 0 10 15 15 20 15 25 3 0 30 15 20 1 5 1 5 1 5 25 3 0 15 1515 30 25 30 1 5 2 0 15 20 10 15 20 2 5 15 20 10 30 15 20 15 25 20 25 30 35 30 25 30 25 2 5 2 0 2 5 1 5 1 5 1 0 20 1 5 15 10 2 0 20 20 2 0 15 20 25 10 10 COOLING POND 1 2 3 4 5 6 7 8 9 10 11 10 . 0 10.5 11 . 0 9. 0 8. 5 7.5 8. 0 8.5 8 . 0 7.5 7.0 6.5 6.0 10.0 10.0 11.0 12.5 11.0 10.0 9.5 11 . 0 11 . 0 11.0 11 . 0 10 . 0 8 . 0 9.0 9.5 9. 59.0 8.5 5 . 0 9.5 9.0 8.5 7.512.0 10.0 9.0 10.510.5 10. 0 9 . 0 9.5 11.0 12.0 N 2 0 5 , 0 0 0 E 2, 3 1 0 , 0 0 0 N 2 0 3 , 0 0 0 N 2 0 1 , 0 0 0 N 1 9 9 , 0 0 0 N 1 9 7 , 0 0 0 E 2, 3 0 8 , 0 0 0 E 2, 3 0 6 , 0 0 0 E 2, 3 0 4 , 0 0 0 PROPERTY BOUNDARY AERIAL MAPPING LIMIT (NOTE 6) SITE ENTRANCE 1984 BASIN BOUNDARY LAY OF LAND AREA (LOLA) BOUNDARY 1971 BASIN BOUNDARY DISC H A R G E C A N A L DMW-1 DMW-2 DMW-3 DMW-4BMW-1 BMW-3 SUT-EW-1 (EW-1)SUT-EW-2SUT-EW-3SUT-EW-4SUT-EW-5SUT-EW-6SUT-EW-7SUT-EW-8SUT-EW-9 LF-CWW-1A BMW-4 BMW-2 LF-CWW-1B 0 300'600' SCALE IN FEET N PROJECT NO: FIGURE GROUNDWATER MONITORING PLAN PHASE 1 BUILDOUT L.V. SUTTON ENERGY COMPLEX WILMINGTON, NORTH CAROLINA NOVEMBER 2016 2 GC6005 80 193.4 (est.) 191.1 PROPERTY BOUNDARY EXISTING GROUND ELEVATION CONTOURS IN OBSCURED AREAS (NOTES 1, 2, AND 4) EXISTING GROUND ELEVATION CONTOURS IN OPEN AREAS (NOTES 1 AND 2) AERIAL MAPPING LIMIT (NOTE 6) DRAINAGE CENTERLINE (NOTE 2) FENCE LINE (NOTE 2) GRAVEL / DIRT PATH (NOTE 2) SPOT ELEVATION (NOTES 1, 2, AND 4) SPOT ELEVATION ESTIMATED IN OBSCURED AREAS (NOTES 1, 2, AND 4) TREE / BRUSH LINE (NOTE 2) UNIDENTIFIED UTILITIES / STRUCTURES / OBJECTS (NOTES 2 AND 3) UTILITY POLE (NOTES 2 AND 3) OVERHEAD ELECTRICAL TRANSMISSION LINE WATER (NOTE 5) CCR BASIN/COOLING POND BOUNDARY (APPROXIMATE) LAY OF LAND AREA (LOLA) BOUNDARY X X X X X X X X LEGEND NOTES: 1. COORDINATES ARE BASED ON NORTH CAROLINA STATE PLANE GRID SYSTEM, NAD83 (FEET). ELEVATIONS ARE BASED ON NAVD88 (FEET). 2. THE PLANIMETRIC LOCATION ON THIS MAP IS BASED ON PHOTOGRAMMETRIC MAPPING OF IMAGERY COLLECTED ON 17 APRIL 2014. DATA PROVIDED WHERE CLEAR AND VISIBLE ON THE IMAGERY IS WITHIN 2' OF ITS TRUE POSITION. 3. THE LOCATION OF ANY AND ALL UTILITIES SHOWN HEREON WHETHER PUBLIC OR PRIVATE, IS BASED ON PHOTOGRAMMETRIC MAPPING AND IS APPROXIMATE. IT IS THE USERS RESPONSIBILITY TO VERIFY LOCATION PRIOR TO COMMENCEMENT OF ANY DESIGN OR CONSTRUCTION. 4. DASHED CONTOURS AND ESTIMATED SPOT ELEVATIONS SHOWN IN OBSCURED AREAS ARE COMPILED FROM LIMITED PHOTOGRAMMETRIC DATA DUE TO CONDITIONS DURING THE 17 APRIL 2014 FLIGHT. INFORMATION SHOWN IN OBSCURED AREAS ARE FOR REFERENCE ONLY. 5. CONTOURS SHOWN UNDERWATER ARE FROM BATHYMETRIC SURVEYS CONDUCTED BY WSP IN JUNE 2014. 6. CONTOURS SHOWN OUTSIDE THE AERIAL MAPPING LIMIT ARE FROM A LIDAR SURVEY DATED APRIL 2007 OBTAINED FROM THE NORTH CAROLINA DOT GIS WEBSITE. CONTOURS AND TOPOGRAPHY WITHIN THE AERIAL MAPPING LIMIT WERE OBTAINED FROM AN AERIAL SURVEY DATED MARCH 2015 (FLOWN 17 APRIL 2014) AND WERE OBTAINED FROM WSP. 7. FLOOD ZONE INFORMATION OBTAINED FROM NEW HANOVER COUNTY GIS WEBSITE AND ARE SHOWN IN REFERENCE TO FEMA FIRM MAP PANELS 3109 AND 3200, LAST REVISED 2 JUNE 2006. 8. NATIONAL WETLAND INVENTORY INFORMATION SHOWN WAS OBTAINED FROM THE US FISH AND WILDLIFE SERVICE WEBSITE. FEMA FLOOD ZONE AE (NOTE 7) FEMA FLOOD ZONE X (NOTE 7) WETLANDS - NATIONAL WETLAND INVENTORY (NOTE 8) PROPOSED LANDFILL CONTOUR LEACHATE TRANSMISSION SYSTEM FORCE MAIN LEACHATE TRANSMISSION MANHOLE MODELED GROUNDWATER ELEVATION CONTOUR DETECTION MONITORING WELL BACKGROUND MONITORING WELL EXTRACTION WELL DISPOSAL AREA SURFACE WATER PONDS LEACHATE STORAGE AREA DISPOSAL AREA CELL IDENTIFICATION W W OE 9.0 DMW-2 BMW-2 SUT-EW-2 MH03 LFM 1 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X RO C K DIR T 11. 2 10. 6 -0 . 3 0.1 0.1 0.3 0.1 -0. 5 27. 6 27 . 5 26 . 8 34. 3 33 . 5 33. 7 33. 7 33. 7 33. 1 35 . 0 3 5 . 8 27. 2 28 . 9 34. 7 27 . 5 27 . 3 29 . 7 34. 4 33. 8 33 . 5 33. 533. 2 33. 0 34. 1 34 . 9 34. 8 32.9 34 . 4 34 . 2 34 . 1 31 . 9 32. 5 33. 0 33. 4 33 . 1 33. 6 33. 7 33 . 7 33. 7 45. 3 45 . 8 46. 6 47 . 4 46. 6 38. 4 31. 7 40. 9 43. 0 33 . 2 30 . 6 26. 6 27 . 0 26 . 5 28 . 7 29. 3 22. 9 20 . 5 (e s t . ) 19 . 6 (e s t . ) 32. 5 34 . 5 35 . 4 44. 9 33 . 7 33 . 8 34 . 3 34 . 7 34. 6 42 . 5 42. 7 42. 5 42. 7 25 . 9 (es t . ) 26. 8 (e s t . ) 28. 4 14 . 5 19 . 3 13. 5 13. 5 13. 2 13. 2 13. 6 13. 4 13. 4 36. 9 36 . 7 38. 8 41. 1 40. 9 40 . 5 40. 8 42. 4 42. 7 43. 3 CH A N N E L W . E . = 36. 1 4 / 1 7 / 1 4 52 . 8 53 . 0 51. 2 51. 4 51 . 5 51 . 6 50 . 7 51. 6 41. 1 40. 8 32. 8 36. 0 8.8 8.5 8.4 8.5 0.7 19.018.718.2 19. 5 26. 9 21. 8 12. 9 18. 5 12. 4 17 . 1 23 . 4 20 . 8 17. 4 17 . 5 21. 4 22. 6 21 . 3 23. 4 14. 9 12.7 14.3 13.3 13.0 24. 8 33 . 8 19. 0 16.9 21. 0 16. 9 32. 6 19. 0 13. 9 23. 0 24 . 1 23. 4 17. 4 22. 6 16. 4 20 . 4 20. 417. 2 17. 4 14 . 3 28 . 7 15. 3 15 . 4 15. 6 15.5 16.7 16. 4 16. 5 16. 4 15. 9 19. 0 15. 6 15. 7 15 . 8 17 . 1 16 . 7 17. 1 16 . 5 17. 3 17 . 5 35 . 2 20. 8 20. 3 23. 0 23 . 2 17 . 7 17.6 19.3 21. 1 20. 8 24.7 25.4 27 . 1 24. 7 24. 8 18. 9 24. 7 26. 1 16.6 24. 8 29. 1 14 . 6 14. 2 15. 0 14. 5 15 . 2 15. 3 16.2 14. 9 15. 0 24. 2 13. 7 17. 422. 9 24. 9 17 . 8 19. 4 19.4 15. 3 26 . 2 23. 4 15. 1 14 . 3 16. 9 17 . 3 16. 5 14. 8 19. 1 23. 0 19 . 5 19. 715.4 38 . 5 37. 6 39. 1 38 . 9 24. 4 24. 4 32. 4 24 . 3 39. 3 35. 233 . 0 34 . 6 25. 5 34. 6 19. 5 23. 5 24 . 3 21. 3 18. 5 17. 6 17. 6 17. 1 17. 0 17. 3 14. 3 14. 4 15.8 14. 9 13. 6 13. 615 . 5 16. 8 17 . 4 17. 8 18 . 4 18. 4 18. 3 18. 6 19. 0 18. 6 18 . 7 18 . 3 18 . 8 18. 9 21. 1 20. 7 22. 5 22. 9 19 . 4 18. 7 19. 2 31. 0 28 . 8 27 . 5 27. 0 28. 8 21. 3 17.2 23. 0 32 . 6 20. 217. 7 16. 5 16. 8 37 . 2 34. 7 33. 1 22. 5 23. 6 23. 2 19. 3 18. 7 22. 2 21. 8 19. 821. 4 20.6 29. 328. 6 29 . 2 21. 2 21.2 21 . 6 19. 5 21. 4 20.819.3 18.9 15. 4 14.8 14.7 30. 3 29. 2 24 . 4 18 . 8 22 . 3 20 . 5 21. 2 27 . 1 17 . 0 15.8 0.9 1.3 1.1 1.1 21.0 14 . 6 13 . 2 15.4 19.2 19.5 11. 3 11. 5 11. 0 11. 8 11 . 8 11 . 9 12. 7 15. 1 14 . 4 18 . 6 19 . 2 13. 1 12. 5 12. 8 13. 2 12. 6 12. 5 15.1 10. 9 24. 6 17. 6 23 . 0 24. 9 12 . 3 12 . 4 12. 5 23. 0 18. 4 12. 7 12. 6 12. 8 14. 9 16. 7 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X XPILE PIL E 12. 6 12. 4 -0. 2 0.5 -0. 5 0.5 30. 6 28 . 9 27. 8 27. 8 27 . 9 32. 4 32. 8 33. 3 29 . 0 28. 5 3 1 . 4 33. 7 33. 4 33. 0 33 . 4 33 . 5 33 . 4 33. 8 34. 8 38. 8 34. 3 34 . 1 26 . 9 25. 8 32 . 6 32. 7 33. 0 33. 3 33. 8 33. 5 33. 3 45. 0 40. 6 39. 3 31 . 8 33 . 5 27. 6 25 . 3 25. 1 21. 6 31. 4 32. 6 33 . 1 33. 4 35. 1 35. 2 45. 233. 533 . 2 33. 6 34. 6 33. 7 33. 7 34 . 8 16. 7 17. 3 17 . 7 18. 5 14 . 9 14. 6 13. 5 13. 4 13. 5 13. 3 13 . 1 13. 7 18. 7 13. 3 40. 0 38. 8 40 . 4 40 . 5 38. 1 44. 9 43 . 1 41. 4 40. 7 40. 4 40. 3 40 . 4 42. 7 42 . 3 43. 0 52. 5 52 . 6 52. 2 52. 2 51. 5 51 . 5 51. 0 50. 9 40 . 8 41 . 0 41. 2 40. 9 42 . 7 41. 2 19 . 1 18 . 6 42 . 7 42. 4 45 . 5 9.5 8.2 19 . 0 18.9 18.418.9 19 . 0 11. 4 12. 9 11. 3 9.0 48. 7 28. 8 15. 5 14. 7 14 . 3 14. 7 19 . 3 19. 1 14. 7 19 . 0 21. 1 23. 0 22.9 12 . 6 12. 5 29. 0 41. 0 23. 0 27.5 32. 5 31. 4 17.616.7 17.1 19 . 0 16 . 8 19 . 5 21. 1 21. 4 15. 3 30. 6 29 . 2 24. 8 21. 4 22 . 1 16.3 14. 6 13 . 9 19. 7 18. 6 14 . 0 18. 2 13. 2 24.6 17. 3 22 . 7 28 . 9 15. 8 16. 8 15 . 9 16. 3 17 . 0 16. 8 16. 617. 0 17 . 4 27. 4 24. 5 36. 5 28. 7 21. 5 17.2 31 . 6 28 . 6 15.2 14.8 14. 3 23. 8 25 . 1 15. 6 15. 5 25. 7 21. 4 30. 3 29 . 0 22. 9 19. 3 17. 2 15. 2 15. 0 15. 0 15 . 3 16.4 16.5 13 . 9 23 . 0 23. 1 18 . 5 19 . 1 21. 6 21. 0 19 . 0 18. 7 14 . 4 8.7 10. 1 20. 7 20. 9 21. 2 22. 6 20. 5 22. 3 18. 4 38. 5 25. 3 31. 5 36. 9 3 3 . 3 19. 3 16 . 9 16 . 5 17 . 517 . 2 17 . 4 17. 0 16. 8 17. 0 14. 7 14. 8 22. 5 15. 4 13. 6 13 . 9 13. 6 14. 1 14. 4 28. 5 17. 8 17 . 2 1.7 18. 8 18. 9 19. 1 18. 5 16 . 6 31. 0 23. 8 30 . 3 22 . 4 17. 3 19. 4 19 . 4 21 . 2 23. 3 24.5 18. 2 20. 9 17. 3 17. 5 17 . 1 17. 0 21. 3 31 . 3 34 . 4 25. 1 17.6 16. 9 21. 8 14 . 8 33. 7 14 . 6 0.9 1.0 1.0 29. 0 29 . 5 27. 1 27. 1 21 . 0 12. 1 12. 8 13. 0 12 . 8 34 . 4 17. 5 12. 7 12. 4 12. 3 25.7 15.7 22 . 3 16. 6 14 . 8 OE OE OE OE OE OE OE OE OE OE OEOE OE OEOEOEOEOEOEOEOEOEOEOE OE OEOEOEOEOEOEOEOEOEOE OE OEOEOEOEOEOEOEOEOE OE OE OEOEOEOEOEOEOEOE W.E . = 2 5 . 4 ' 5/2 9 / 1 4 3 0 " C M P 11. 2 10. 2 9.3 9.2 9.1 9.7 11. 5 11. 5 11. 3 7.8 14. 9 12. 3 12. 5 12. 7 12. 6 13. 0 13. 1 13. 3 13. 3 11. 0 9.7 9.2 11. 4 10. 7 10. 6 9.3 9.7 7.5 8.3 10. 6 14. 6 10. 6 8.9 10. 5 13. 1 11. 5 11. 0 11. 0 11. 0 9.8 9.0 9.2 8.6 10. 49.3 9.1 9.3 9.4 9.5 9.6 9.4 OE OE OEOEOEOEOEOEOEOE OE OE OE OE OE OEOEOEOEOEOEOEOEOEOEOE OE OE OE OE OEOEOEOEOEOEOEOEOEOE OE OE OE OE OEOEOEOEOEOEOEOEOE OE OE OE OE OE OEOEOEOEOEOEOEOE 30 30 30 30 20 20 20 20 2 0 20 2 0 20 20 20 20 2 0 2 0 10 50 40 4 0 4 0 40 40 40 30 3 0 30 30 30 3 0 30 2 0 20 20 20 30 30 3 0 30 30 30 30 3 0 30 3 0 10 3030 30 3 0 10 10 20 20 20 2 0 20 20 20 2 0 2020 20 20 20 20 20 20 20 2 0 20 20 20 20 20 20 2 0 20 20 20 20 30 20 20 20 20 2 0 20 2 0 2 0 3 0 20 20 20 20 20 2 0 10 10 10 10 0 20 50 40 2 0 40 40 40 40 40 4 0 40 40 4 0 40 40 20 40 40 2 0 30 30 30 30 30 10 30 3 0 30 30 1 0 3 0 10 30 3030 30 3 0 20 20 20 50 20 20 20 20 40 20 20 2 0 20 2 0 20 3 0 3 0 3 0 3 0 30 40 30 30 40 30 30 30 30 10 40 20 20 20 40 20 20 40 20 2 0 20 20 2020 40 20 20 2 0 20 20 40 20 20 20 20 20 20 2 0 30 2 0 20 2 0 30 20 20 20 20 30 20 20 20 1 0 30 10 50 50 40 30 4 0 40 40 2 0 40 40 40 40 40 40 40 40 40 40 40 20 40 40 4 0 40 40 30 30 30 30 30 3 0 2 0 30 30 3 0 3 0 3 0 30 20 20 20 20 20 20 20 10 20 20 20 20 10 20 20 0 10 0 1 0 10 10 10 10 10 10 1 0 1 0 1 0 10 10 W W W W W W W W W W W W W W W WW W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W W W W W WWWW W W W W W W W W W W W W W W W W W W W WW W W W W W W W W W W W W W W W W W W W W W W W W W WW W W W W W W WW W W 30 30 25 20 20 3 0 15 10 10 10 15 1 5 20 30 2 5 35 10 1 0 15 1 0 10 15 15 20 15 25 3 0 30 15 20 1 5 1 5 1 5 25 3 0 15 1515 30 25 30 1 5 2 0 15 20 10 15 20 2 5 15 20 10 30 15 20 15 25 20 25 30 35 30 25 30 25 2 5 2 0 2 5 1 5 1 5 1 0 20 1 5 15 10 2 0 20 20 2 0 15 20 25 10 10 DISC H A R G E C A N A L COOLING POND 10.0 10.5 11 . 0 9. 0 8.5 8 . 0 8.5 8 . 0 7.5 7.0 6.5 6.0 10.0 11. 0 13.0 8. 5 9.5 11 . 0 11 . 0 11.0 11 . 0 10 . 0 8.0 9.0 9.5 9. 59.0 8.5 5 . 0 9.5 9.0 8.5 9.0 13.0 1 3 . 0 9.0 9.5 10 . 0 9.0 9.5 10 . 0 11 . 0 11.0 12.0 10.0 14.0 9. 0 12 . 0 13.0 1 0 . 0 1 2 3 4 5 6 7 8 9 10 11 PROPERTY BOUNDARY AERIAL MAPPING LIMIT (NOTE 6) SITE ENTRANCE 1984 ASH BASIN BOUNDARY 1971 ASH BASIN BOUNDARY LAY OF LAND AREA (LOLA) BOUNDARY DMW-1 DMW-2 DMW-3 DMW-4 DMW-5 DMW-6 BMW-1 BMW-3 SUT-EW-1 (EW-1)SUT-EW-2SUT-EW-3SUT-EW-4SUT-EW-5SUT-EW-6SUT-EW-7SUT-EW-8SUT-EW-9 BMW-4 BMW-5 BMW-6 DMW-7 DMW-8 BMW-2 LF-CWW-1A LF-CWW-1B N 2 0 5 , 0 0 0 E 2, 3 1 0 , 0 0 0 N 2 0 3 , 0 0 0 N 2 0 1 , 0 0 0 N 1 9 9 , 0 0 0 N 1 9 7 , 0 0 0 E 2, 3 0 8 , 0 0 0 E 2,3 0 6 , 0 0 0 E 2, 3 0 4 , 0 0 0 PROJECT NO: FIGURE GROUNDWATER MONITORING PLAN FINAL BUILDOUT L.V. SUTTON ENERGY COMPLEX WILMINGTON, NORTH CAROLINA NOVEMBER 2016 3 GC6005 80 193.4 (est.) 191.1 PROPERTY BOUNDARY EXISTING GROUND ELEVATION CONTOURS IN OBSCURED AREAS (NOTES 1, 2, AND 4) EXISTING GROUND ELEVATION CONTOURS IN OPEN AREAS (NOTES 1 AND 2) AERIAL MAPPING LIMIT (NOTE 6) DRAINAGE CENTERLINE (NOTE 2) FENCE LINE (NOTE 2) GRAVEL / DIRT PATH (NOTE 2) SPOT ELEVATION (NOTES 1, 2, AND 4) SPOT ELEVATION ESTIMATED IN OBSCURED AREAS (NOTES 1, 2, AND 4) TREE / BRUSH LINE (NOTE 2) UNIDENTIFIED UTILITIES / STRUCTURES / OBJECTS (NOTES 2 AND 3) UTILITY POLE (NOTES 2 AND 3) OVERHEAD ELECTRICAL TRANSMISSION LINE WATER (NOTE 5) CCR BASIN/COOLING POND BOUNDARY (APPROXIMATE) LAY OF LAND AREA (LOLA) BOUNDARY X X X X X X X X LEGEND NOTES: 1. COORDINATES ARE BASED ON NORTH CAROLINA STATE PLANE GRID SYSTEM, NAD83 (FEET). ELEVATIONS ARE BASED ON NAVD88 (FEET). 2. THE PLANIMETRIC LOCATION ON THIS MAP IS BASED ON PHOTOGRAMMETRIC MAPPING OF IMAGERY COLLECTED ON 17 APRIL 2014. DATA PROVIDED WHERE CLEAR AND VISIBLE ON THE IMAGERY IS WITHIN 2' OF ITS TRUE POSITION. 3. THE LOCATION OF ANY AND ALL UTILITIES SHOWN HEREON WHETHER PUBLIC OR PRIVATE, IS BASED ON PHOTOGRAMMETRIC MAPPING AND IS APPROXIMATE. IT IS THE USERS RESPONSIBILITY TO VERIFY LOCATION PRIOR TO COMMENCEMENT OF ANY DESIGN OR CONSTRUCTION. 4. DASHED CONTOURS AND ESTIMATED SPOT ELEVATIONS SHOWN IN OBSCURED AREAS ARE COMPILED FROM LIMITED PHOTOGRAMMETRIC DATA DUE TO CONDITIONS DURING THE 17 APRIL 2014 FLIGHT. INFORMATION SHOWN IN OBSCURED AREAS ARE FOR REFERENCE ONLY. 5. CONTOURS SHOWN UNDERWATER ARE FROM BATHYMETRIC SURVEYS CONDUCTED BY WSP IN JUNE 2014. 6. CONTOURS SHOWN OUTSIDE THE AERIAL MAPPING LIMIT ARE FROM A LIDAR SURVEY DATED APRIL 2007 OBTAINED FROM THE NORTH CAROLINA DOT GIS WEBSITE. CONTOURS AND TOPOGRAPHY WITHIN THE AERIAL MAPPING LIMIT WERE OBTAINED FROM AN AERIAL SURVEY DATED MARCH 2015 (FLOWN 17 APRIL 2014) AND WERE OBTAINED FROM WSP. 7. FLOOD ZONE INFORMATION OBTAINED FROM NEW HANOVER COUNTY GIS WEBSITE AND ARE SHOWN IN REFERENCE TO FEMA FIRM MAP PANELS 3109 AND 3200, LAST REVISED 2 JUNE 2006. 8. NATIONAL WETLAND INVENTORY INFORMATION SHOWN WAS OBTAINED FROM THE US FISH AND WILDLIFE SERVICE WEBSITE. W W OE 9.0 MH03 LFM 0 300'600' SCALE IN FEET N DMW-2 BMW-2 SUT-EW-2 1 FEMA FLOOD ZONE AE (NOTE 7) FEMA FLOOD ZONE X (NOTE 7) WETLANDS - NATIONAL WETLAND INVENTORY (NOTE 8) PROPOSED LANDFILL CONTOUR LEACHATE TRANSMISSION SYSTEM FORCE MAIN LEACHATE TRANSMISSION MANHOLE MODELED GROUNDWATER ELEVATION CONTOUR DETECTION MONITORING WELL BACKGROUND MONITORING WELL EXTRACTION WELL DISPOSAL AREA SURFACE WATER PONDS LEACHATE STORAGE AREA DISPOSAL AREA CELL IDENTIFICATION 4" (MIN) TBD 6" 1' 10' 2.5' 0.5' BOTTOM OF CONCRETE APPROXIMATELY 1' BELOW FINAL GRADE 2' 1' NOMINAL 6.5" BOREHOLE TBD 11.5' LOCKING CAP VENTING CAP 4" DIAMATER STEEL PROTECTIVE CASING UNIFORM PEA GRAVEL (WASHED) 2'X2' CONCRETE PAD FINAL GRADE CEMENT/BENTONITE GROUT FINAL SAND SEAL (30/65 GRADE) 2" WELL CASING/RISER ASTM NSF RATED SCH. 40 PVC, FLUSH-THREADED SAND PACK (20/30 SILICA SAND) FACTORY SLOTTED 10'x2" # 10 SLOT (0.010") PRE-PACKED WELL SCREEN (20/40 SILICA SAND) END CAP 0' NAVD 1988 -10' NAVD 1988 1/2" DIAMETER WEEP HOLE IDENTIFICATION PLATE (SEE IDENTIFICATION PLATE INFORMATION BELOW) PROJECT NO. FILE NO. FIGURE NO. DATE: K:\ _ P R O J E C T S \ D \ D U K E E N E R G Y \ S U T T O N \ O N S I T E L A N D F I L L A P P L I C A T I O N ( G C 5 7 7 0 . 0 2 ) \ F I G U R E S \ G C 5 7 7 0 . 0 2 F 0 0 1 . D W G ( 4 A u g u s t 2 0 1 5 ) j o r d o y n e GC5770.02 4 GC5770.02F001AUGUST 2015 CHARLOTTE, NC PROPOSED TYPICAL MONITORING WELL CONSTRUCTION DETAIL TBD LEGEND TO BE DETERMINED BASED ON FINAL GRADE AT EACH WELL LOCATION NOTE: 1. A DURABLE, WATERPROOF AND RUSTPROOF IDENTIFICATION PLATE WILL BE AFFIXED TO EACH WELL AND WILL CONTAIN THE FLOWING INFORMATION: a. WELL CONTRACTOR NAME AND CERTIFICATION NUMBER. b. DATE WELL COMPLETED. c. TOTAL DEPTH OF WELL. d. A WARNING THAT THE WELL IS NOT FOR WATER SUPPLY AND THAT THE GROUNDWATER MAY CONTAIN HAZARDOUS MATERIALS. e. DEPTH(S) TO THE TOP(S) AND BOTTOM(S) OF THE SCREEN(S). f. WELL IDENTIFICATION NUMBER. ATTACHMENT A GROUNDWATER POTENTIOMETRIC SURFACE MAPS LA-PZ-1 LA-PZ-2 LA-PZ-3 LA-PZ-4 LA-PZ-5 LA-SPT-1 LA-SPT-2 LA-SPT-3 LA-SPT-4 LA-SPT-5 LA-SPT-6 10.0 1 0 . 5 11. 0 11.5 12.0 11.5 11.0 1 0 . 5 MW-9 11.5 11.0 LEGEND APPROXIMATE BASIN AND LANDFILL OUTLINE APPROXIMATE COOLING POND OUTLINE APPROXIMATE LAY OF LAND AREA (LOLA) OUTLINE APPROXIMATE PROPERTY BOUNDARY LANDFILL 50 FOOT BUFFER LANDFILL 500 FOOT BUFFER POTENTIOMETRIC CONTOURS INSIDE POTENTIAL LANDFILL FOOTPRINT HISTORICAL MONITORING WELLS HISTORICAL PIEZOMETERS PROPOSED GEOSYNTEC LANDFILL AREA PIEZOMETER NOTES: .A SUFFIX WAS ADDED TO HISTORICAL PIEZOMETER PAIRS TO INDICATE THE DEPTH I.E. D: DEEP, S: SHALLOW. .GROUNDWATER LEVELS WERE COLLECTED ON JANUARY 27 AND 28, 2015. .HORIZONTAL COORDINATE SYSTEM IS BASED ON NORTH CAROLINA STATE PLANE NCGRID/NAD83 (2011), US SURVEY FEET. .ELEVATIONS ON THIS FIGURE ARE REFERENCED TO NAVD88 VERTICAL DATUM. N COOLING POND 1984 ASH BASIN 1984 ASH BASIN (2006 INTERIOR CONTAINMENT AREA) GREENFIELD LANDFILL AREA 1971 ASH BASIN LOLA CANAL 1,000'0 SCALE IN FEET LA-PZ-1 PROJECT NO: FIGURE L.V. SUTTON POTENTIOMETRIC SURFACE MAP JANUARY 2015 0$< 2015 GC5770 PZ-1 MW-1A GWPZ-3A 10.0 11.2 10.6 -0.30.10.10.3 0.1 -0.527.6 27.5 2 6 . 8 3 4 . 3 3 3 . 5 3 3 . 7 3 3 . 7 3 3 . 7 3 3 . 1 3 5 . 0 3 5 . 8 27.228.934.7 27.527.3 29.734.4 33.8 33.5 33.5 33.2 33.0 34.1 3 4 . 9 3 4 . 8 32.9 34.4 3 4 . 2 3 4 . 1 3 1 . 9 3 2 . 5 3 3 . 0 3 3 . 4 3 3 . 1 33.6 33.7 3 3 . 7 3 3 . 7 4 5 . 3 4 5 . 8 4 6 . 6 4 7 . 4 4 6 . 6 3 8 . 4 3 1 . 7 4 0 . 9 4 3 . 0 3 3 . 2 3 0 . 6 2 6 . 6 2 7 . 0 2 6 . 5 2 8 . 7 2 9 . 3 2 2 . 9 3 2 . 5 34.535.444.9 3 3 . 7 3 3 . 8 3 4 . 3 3 4 . 7 3 4 . 6 4 2 . 5 4 2 . 7 4 2 . 5 4 2 . 7 2 5 . 9 ( e s t . ) 2 6 . 8 ( e s t . ) 2 8 . 4 1 4 . 5 1 9 . 3 1 3 . 5 1 3 . 5 1 3 . 2 1 3 . 2 1 3 . 6 1 3 . 4 1 3 . 4 3 6 . 9 3 6 . 7 3 8 . 8 4 1 . 1 4 0 . 9 4 0 . 5 4 0 . 8 4 2 . 4 4 2 . 7 4 3 . 3 5 2 . 8 5 3 . 0 5 1 . 2 5 1 . 4 5 1 . 5 5 1 . 6 5 0 . 7 5 1 . 6 4 1 . 1 4 0 . 8 3 2 . 8 3 6 . 0 8.8 8.5 8.4 8.50.7 19 . 0 18 . 7 18 . 2 1 9 . 5 26.9 2 1 . 8 1 2 . 9 1 8 . 5 1 2 . 4 1 7 . 1 2 3 . 4 2 0 . 8 1 7 . 4 1 7 . 5 2 1 . 4 2 2 . 6 2 1 . 3 2 3 . 4 1 4 . 9 12 . 7 14 . 3 13 . 3 13 . 0 2 4 . 8 3 3 . 8 1 9 . 0 16 . 9 2 1 . 0 1 6 . 9 3 2 . 6 1 9 . 0 1 3 . 9 2 3 . 0 2 4 . 1 2 3 . 4 1 7 . 4 2 2 . 6 1 6 . 4 2 0 . 4 2 0 . 4 1 7 . 2 1 7 . 4 1 4 . 3 2 8 . 7 1 5 . 3 1 5 . 4 1 5 . 6 15 . 5 16 . 7 1 6 . 4 1 6 . 5 1 6 . 4 1 5 . 9 1 9 . 0 1 5 . 6 1 5 . 7 1 5 . 8 1 7 . 1 1 6 . 7 1 7 . 1 1 6 . 5 1 7 . 3 1 7 . 5 3 5 . 2 2 0 . 8 2 0 . 3 2 3 . 0 2 3 . 2 1 7 . 7 17 . 6 19 . 3 2 1 . 1 2 0 . 8 24 . 7 25 . 4 2 7 . 1 2 4 . 7 2 4 . 8 1 8 . 9 2 4 . 7 2 6 . 1 16 . 6 2 4 . 8 2 9 . 1 1 4 . 6 1 4 . 2 1 5 . 0 1 4 . 5 1 5 . 2 1 5 . 3 16 . 2 1 4 . 9 1 5 . 0 2 4 . 2 1 3 . 7 1 7 . 4 2 2 . 9 2 4 . 9 17.8 19.4 19.4 15.326.2 23.4 15.114.316.9 17.3 16.5 14.8 19.1 23.0 19.5 19.7 15.438.537.639.138.9 24.4 24.432.4 24.3 39.3 35.2 33.0 34.625.5 34.619.523.524.3 21.3 18.5 17.6 17.617.1 17.017.3 14.314.415.8 14.9 13.6 13.6 1 5 . 5 16.817.417.8 18.418.418.3 18.6 19.0 18.6 18.7 18.318.818.9 21.1 20.722.522.9 19.4 18.719.231.0 28.8 27.5 27.0 28.821.3 17.2 23.0 32.6 20.2 1 7 . 7 16.5 1 6 . 8 3 7 . 2 3 4 . 7 3 3 . 1 2 2 . 5 2 3 . 6 2 3 . 2 1 9 . 3 1 8 . 7 2 2 . 2 2 1 . 8 1 9 . 8 2 1 . 4 20 . 6 2 9 . 3 2 8 . 6 2 9 . 2 2 1 . 2 21 . 2 21.6 19.5 2 1 . 4 20 . 8 19 . 3 18 . 9 1 5 . 4 14 . 8 14 . 7 3 0 . 3 2 9 . 2 2 4 . 4 1 8 . 8 2 2 . 3 2 0 . 5 2 1 . 2 27.117.015.8 0.9 1.31.1 1.121.014.6 13.2 15.4 19.219.5 1 1 . 3 1 1 . 5 1 1 . 0 1 1 . 8 1 1 . 8 1 1 . 9 1 2 . 7 1 5 . 1 1 4 . 4 1 8 . 6 1 9 . 2 1 3 . 1 1 2 . 5 1 2 . 8 1 3 . 2 1 2 . 6 1 2 . 5 15 . 1 1 0 . 9 2 4 . 6 1 7 . 6 23.0 24.912.3 12.412.5 23.0 18.4 1 2 . 7 1 2 . 6 1 2 . 8 1 4 . 9 16.7 12.612.4 -0.20.5 -0.50.530.6 28.9 27.8 27.8 27.9 3 2 . 4 3 2 . 8 3 3 . 3 29.0 28.531.433.733.4 33.0 33.4 33.5 33.433.8 3 4 . 8 3 8 . 8 34.3 34.1 2 6 . 9 2 5 . 8 3 2 . 6 3 2 . 7 3 3 . 0 3 3 . 3 33.8 33.5 3 3 . 3 45.0 4 0 . 6 3 9 . 3 3 1 . 8 3 3 . 5 2 7 . 6 2 5 . 3 2 5 . 1 2 1 . 6 3 1 . 4 3 2 . 6 3 3 . 1 33.435.135.245.2 3 3 . 5 3 3 . 2 3 3 . 6 3 4 . 6 3 3 . 7 3 3 . 7 3 4 . 8 1 6 . 7 1 7 . 3 1 7 . 7 1 8 . 5 1 4 . 9 1 4 . 6 1 3 . 5 1 3 . 4 1 3 . 5 1 3 . 3 1 3 . 1 1 3 . 7 1 8 . 7 1 3 . 3 4 0 . 0 3 8 . 8 4 0 . 4 4 0 . 5 3 8 . 1 4 4 . 9 4 3 . 1 4 1 . 4 4 0 . 7 4 0 . 4 4 0 . 3 4 0 . 4 4 2 . 7 4 2 . 3 4 3 . 0 5 2 . 5 5 2 . 6 5 2 . 2 5 2 . 2 5 1 . 5 5 1 . 5 5 1 . 0 5 0 . 9 4 0 . 8 4 1 . 0 4 1 . 2 4 0 . 9 4 2 . 7 4 1 . 2 19.1 18.6 4 2 . 7 4 2 . 4 45.59.5 8.2 1 9 . 0 18 . 9 18 . 4 18 . 9 1 9 . 0 1 1 . 4 1 2 . 9 1 1 . 3 48.728.8 1 5 . 5 1 4 . 7 1 4 . 3 1 4 . 7 1 9 . 3 1 9 . 1 1 4 . 7 1 9 . 0 2 1 . 1 2 3 . 0 22 . 9 1 2 . 6 1 2 . 5 2 9 . 0 4 1 . 0 2 3 . 0 27 . 5 3 2 . 5 3 1 . 4 17 . 6 16 . 7 17 . 1 1 9 . 0 1 6 . 8 1 9 . 5 2 1 . 1 2 1 . 4 1 5 . 3 3 0 . 6 2 9 . 2 2 4 . 8 2 1 . 4 2 2 . 1 16 . 3 1 4 . 6 1 3 . 9 1 9 . 7 1 8 . 6 1 4 . 0 1 8 . 2 1 3 . 2 24 . 6 1 7 . 3 2 2 . 7 2 8 . 9 1 5 . 8 1 6 . 8 1 5 . 9 1 6 . 3 1 7 . 0 1 6 . 8 1 6 . 6 1 7 . 0 1 7 . 4 2 7 . 4 2 4 . 5 3 6 . 5 2 8 . 7 2 1 . 5 17 . 2 3 1 . 6 2 8 . 6 15 . 2 14 . 8 1 4 . 3 2 3 . 8 2 5 . 1 1 5 . 6 1 5 . 5 2 5 . 7 2 1 . 4 3 0 . 3 2 9 . 0 2 2 . 9 1 9 . 3 1 7 . 2 1 5 . 2 1 5 . 0 1 5 . 0 1 5 . 3 16 . 4 16 . 5 1 3 . 9 2 3 . 0 2 3 . 1 18.5 19.121.6 21.019.0 18.7 14.4 8.7 10.1 20.720.921.222.6 20.5 22.318.438.5 25.331.5 36.9 33.3 19.316.916.5 17.5 17.2 17.4 17.0 16.817.0 14.7 14.822.5 15.4 13.613.913.6 1 4 . 1 14.4 28.517.8 17.2 1.718.8 18.9 19.1 18.516.631.0 23.8 30.322.4 17.3 19.4 19.4 21.223.3 24.518.2 20.9 17.317.517.1 17.0 2 1 . 3 31.3 3 4 . 4 25.1 17 . 6 1 6 . 9 2 1 . 8 14.833.7 0.91.01.029.0 29.5 27.127.121.0 1 2 . 1 1 2 . 8 1 3 . 0 1 2 . 8 34.4 17.5 1 2 . 7 1 2 . 4 12.3 25 . 7 15 . 7 2 2 . 3 16.614.8 OE OE OE OE OE OE OE OE OE O E O E O E O E OEOE OE OE OE OE OE OE OE OE OE OEOE OE OE OE OE OE OE OE OE OE OEOE OE OE OE OE OE OE OE OE OEOE OE OE OE OE OE OE OE OE W . E . = 2 5 . 4 ' 5 / 2 9 / 1 4 30"CMP O E O E OE OE OE OE OE OE OE OE O E O E OEOEOEOEOE OE OE OE OE OE OE OE OE OE OEOEOEOEOE OE OE OE OE OE OE OE OE OE OEOEOEOEOE OE OE OE OE OE OE OE OE OEOEOEOEOE OE OE OE OE OE OE OE OE 3 0 30 30 30 2 0 20 20 2 0 2 0 20 2 0 20 202020 2 0 2 0 10 5 0 40 4 0 40 4 0 40 40 3 0 3 0 3 0 30 3 0 3 0 30 2 0 20 20 2 0 30 3030 30 30 3 0 30 3 0 30 30 10 30 30 3 0 3 0 10 10 20 2 0 20 2020 20 2 0 20 20 20 20 20 20 2 0 20 20 2 0 2 0 20 2 0 202020202020202020 3 0 2 0 20 2 0 20 2 0 2 0 2 0 2 0 30 2 0 20 202020 2 0 101010100 20 50 40 2 0 40 4040 4040 4 0 40 4 0 4 0 40 4 0 2 0 40 40 2 0 3 0 3 0 3 0 30 3 0 10 30 303030 1 0 3 0 10 3 0 30 30 3 0 3 0 202020 5 0 20 20 2 0 2 0 40 20 20 2 0 2 0 2 0 2 0 3 0 3 0 3 0 3 0 30 40 3030 4 0 30 30 30 3 0 10 4 0 20 2 0 20 4 0 20 20 40 20 20 2020 20 20 4 0 20 2 0 2 0 20 2 0 4 0 20 20 2 0 20 2 0 2 0 2 0 3 0 2 0 2 0 2 0 30 2 0 2 0 2 0 2 0 30 2 0 2 0 2 0 1 0 3 0 10 5 0 50 4 0 3 0 4 0 4 0 4020 4040 40 4 0 4 0 4 0 4 0 4 0 4 0 4 0 40 2 0 4 0 4 0 4 0 4 0 4 0 30 3 0 3 0 3 0 30 30 203030 3 0 3 0 3 0 3 0 2 0 20 2 0 2020 2 0 2 0 10 2 0 2 0 2 0 20 10 20 20 0 10010101010 1010101010101010 N 2 0 5 , 0 0 0 E 2,310,000 N 2 0 3 , 0 0 0 N 2 0 1 , 0 0 0 N 199,000 N 197,000 E 2 , 3 0 8 , 0 0 0 E 2 , 3 0 6 , 0 0 0 E 2 , 3 0 4 , 0 0 0 PROPERTY BOUNDARY AR E A W I T H I N T H I S L I M I T I S F R O M A N AE R I A L S U R V E Y F L O W N 1 7 A P R I L 2 0 1 4 A N D PR E P A R E D M A R C H 2 0 1 5 ( A R E A O U T S I D E I S FR O M N C D O T L I D A R , D A T E D A P R I L 2 0 0 7 ) 19 8 4 B A S I N 19 7 1 B A S I N LAY OF LAND AREA (LOLA)DISCHARGE CANAL CO O L I N G P O N D B-3 LA - S P T - 1 LA - S P T - 2 LA - S P T - 3 LA - S P T - 4 LA - S P T - 5 LA-SPT-6 LA - S P T - 7 SP T - 1 0 SP T - 8 SPT-1 SP T - 1 1 SPT-13SPT-14 SP T - 2 SPT-3 SP T - 4 SP T - 5 SP T - 6 SP T - 7 SP T - 9 / P Z - I N T CP T - 1 CPT-3 CP T - 4 CP T - 5 CP T - 6 A CP T - 7 A CPT-8 GP-1 GP - 1 0 GP - 1 1 GP - 1 2 GP - 1 3 GP-14 GP-15 GP - 1 6 GP - 1 6 A GP - 1 7 GP - 2 GP - 3 GP-4 GP - 5 GP - 6 GP-7 GP - 8 HA-004-B-3HA-004-PZ-105 HA-004-PZ-106 HA - 0 0 5 - P Z - 1 0 3 HA - 0 0 5 - P Z - 1 0 4 HA-3-1 HA-3-2 MB - 1 MB-2MW 1BMW 2AMW 3AMW 3B MW - 1 0 MW - 1 1 MW - 1 2 MW-13 MW-13DMW-14 MW-15 MW-15DMW-16MW-16DMW-17 MW-18MW-19 MW-1A MW-1BMW-21CMW-22BMW-22CMW-23B MW-23C MW - 2 4 B MW - 2 4 C MW - 2 7 B MW - 2 7 C MW-28B MW-28C MW-2A MW-2BMW-2C MW - 3 1 B MW - 3 1 C MW-32CMW-33C MW - 3 4 B MW - 3 4 C MW - 3 5 B MW - 3 5 C MW - 3 6 B MW - 3 6 C MW-3AMW-3B MW - 6 A MW - 6 B MW - 6 C MW-7A MW-7BMW-7C MW - 9 GW P Z - 1 A GW P Z - 1 B GW P Z - 2 A GW P Z - 2 B GW P Z - 3 A GW P Z - 3 B GWPZ-4A GWPZ-4B LA - P Z - 1 LA - P Z - 2 LA - P Z - 3 LA - P Z - 4 LA-PZ-5 PZ - 1 PZ - 1 0 1 PZ - 1 0 2 PZ - 1 0 3 PZ - 1 0 4 PZ-105 PZ-106PZ-108DPZ-108S PZ - 1 0 D PZ - 1 0 S PZ - 1 1 PZ - 1 2 PZ - 1 3 PZ - 1 4 PZ - 1 5 PZ - 1 6 PZ - 1 7 PZ - 1 8 PZ - 1 9 PZ1971 PZ - 1 A PZ - 1 B PZ - 1 X PZ - 2 PZ - 2 0 PZ - 2 1 PZ - 2 2 PZ - 2 3 PZ - 2 4 PZ - 2 5 PZ - 2 6 PZ - 2 7 PZ-28PZ-29 PZ - 2 A PZ - 2 B PZ - 2 X PZ - 3 PZ - 3 A PZ - 3 B PZ - 3 X PZ - 4 PZ - 4 A PZ - 4 B PZ - 4 X PZ - 5 PZ - 5 A PZ - 5 B PZ - 5 X PZ - 6 PZ - 6 A PZ - 6 B PZ - 6 D PZ - 6 S PZ - 7 PZ - 8 PZ - 9 PZ - I N T SCPT-1 SC P T - 2 SC P T - 3 A SCPT-4 SC P T - 5 A SC P T - 6 SG - 1 SG - 3 SG - 410.0 10.010.5 10.511.0 1 1 . 5 11.5 1 1 . 0 1 1 . 0 1 1 . 5 1 1 . 5 1 1 . 0 1 1 . 5 1 1 . 5 1 1 . 0 1 1 . 0 1 1 . 5 1 1 . 5 1 1 . 0 10.5 10.0 9 . 5 9.5 1 0 . 0 10.5 11.0 1 1 . 0 11.0 11.0 1 1 . 5 DW - 1 DW - 2 DW - 3 DW - 4 DW - 5 DW-6DW-7DW-8 DW-9DW-10 DW-11 DW-12DW-13 DW - 1 4 DW - 1 5 ( P R W - 1 ) PRW-3 PRW-4 PRW-5PRW-6PRW-7 EDR-5NHC-SW2NHC-SW3 NHC-SW4NHC-SW11 PLANT LOCATION PR O P E R T Y B O U N D A R Y EX I S T I N G G R O U N D E L E V A T I O N CO N T O U R S I N O B S C U R E D A R E A S EX I S T I N G G R O U N D E L E V A T I O N CO N T O U R S I N O P E N A R E A S AE R I A L M A P P I N G L I M I T DR A I N A G E C E N T E R L I N E FE N C E L I N E GR A V E L / D I R T P A T H SP O T E L E V A T I O N SP O T E L E V A T I O N E S T I M A T E D IN O B S C U R E D A R E A S TR E E / B R U S H L I N E UN I D E N T I F I E D U T I L I T I E S / S T R U C T U R E S / O B J E C T S UT I L I T Y P O L E WE T A R E A CC R B A S I N / C O O L I N G P O N D B O U N D A R Y (A P P R O X I M A T E ) LA Y O F L A N D A R E A ( L O L A ) B O U N D A R Y GR O U N D W A T E R S U R F A C E C O N T O U R (N O T E 1 ) X X X X X X X X LE G E N D 12 . 0 NO T E S : 1. T H E C O N T O U R S S H O W N O N T H I S M A P W E R E D E V E L O P E D F R O M GR O U N D W A T E R M E A S U R E M E N T S C O N D U C T E D O N 1 1 A N D 1 2 M A R C H 2 0 1 5 . 2. A S U F F I X W A S A D D E D T O H I S T O R I C A L P I E Z O M E T E R P A I R S T O I N D I C A T E DE P T H ( I . E . , D = D E E P A N D S = S H A L L O W ) . 3. E L E V A T I O N S S H O W N A R E N A V D 8 8 . HA N D A U G E R CO N E P E N E T R A T I O N T E S T SE I S M I C C O N E P E N E T R A T I O N T E S T GE O - P R O B E BO R I N G PI E Z O M E T E R MO N I T O R I N G W E L L WA T E R S U P P L Y W E L L AB A N D O N E D W A T E R S U P P L Y W E L L ST A F F G A U G E 0 300'600'SCALE IN FEETN PROJECT NO:FIGUREGROUNDWATER SURFACE MAP MARCH 2015 L.V. SUTTON ENERGY COMPLEX WILMINGTON, NORTH CAROLINA NOVEMBER 20164 GC6005 ATTACHMENT B DUKE ENERGY LOW FLOW SAMPLING PLAN Low Flow Sampling Plan Duke Energy Facilities Ash Basin Groundwater Assessment Program North Carolina June 10, 2015 Duke Energy | Low Flow Groundwater Sampling Plan Table of Contents TABLE OF CONTENTS Low Flow Sampling Plan ....................................................................................................... 1 1.0 PURPOSE ............................................................................................................................... 1 2.0 GENERAL CONSIDERATIONS ............................................................................................. 1 3.0 PROCEDURES ....................................................................................................................... 2 3.1 Pre-Job Preparation ............................................................................................................. 2 3.2 Water-Level Measurements ................................................................................................. 3 3.3 Well Purging ........................................................................................................................ 4 3.3.1 Low-Flow Well Purging ............................................................................................ 4 3.3.2 Volume-Averaging Well Purging .............................................................................. 8 3.4 Sampling ....................................................................................................................... 10 3.4.1 Low-Flow Sampling ............................................................................................... 10 3.4.2 Sampling after Volume-Averaging Purge ............................................................... 11 3.5 Sample Handling, Packing, and Shipping ..................................................................... 11 3.5.1 Handling ................................................................................................................ 11 3.5.2 Sample Labels ....................................................................................................... 11 3.5.3 Chain-of-Custody Record ...................................................................................... 12 3.6 Field Quality Control Samples ....................................................................................... 12 3.7 Field Logbook Documentation....................................................................................... 13 3.8 Decontamination and Waste Management ................................................................... 14 4.0 REFERENCES ..................................................................................................................... 14 APPENDIX ADecontamination of Equipment SOP ................................................................... 15 1.0 Purpose & Application ...................................................................................................... 16 2.0 Equipment & Materials .......................................................................................................... 16 3.0 Procedure ............................................................................................................................. 16 3.1 Decontamination of Non-Disposable Sampling Equipment .......................................... 16 3.2 Decontamination of Field Instrumentation .................................................................... 16 3.3 Decontamination of Groundwater Sampling Equipment ............................................... 17 3.4 Materials from Decontamination Activities .................................................................... 17 APPENDIX BSampling Equipment Check List – Table 1.......................................................... 18 APPENDIX CField Logbook/Data Sheets ................................................................................. 20 Duke Energy | Low Flow Groundwater Sampling Plar 1.0 PURPOSE 1 1.0 PURPOSE The purpose of this low flow sampling plan is to establish a standard operating procedure (SOP) to describe collection procedures for groundwater samples from monitoring wells using low-flow purging and sampling techniques or by the volume- averaged purging and sampling method at Duke Energy Ash Basin Groundwater Assessment Program facilities. 2.0 GENERAL CONSIDERATIONS Potential hazards associated with the planned tasks shall be thoroughly evaluated prior to conducting field activities. The Ready-To-Work Plan developed for each facility provides, among other items, a description of potential hazards and associated safety and control measures. Sampling personnel must wear powder-free nitrile gloves or equivalent while performing the procedures described in this SOP. Specifically, gloves must be worn while preparing sample bottles, preparing and decontaminating sampling equipment, collecting samples, and packing samples. At a minimum, gloves must be changed prior to the collection of each sample, or as necessary to prevent the possibility of cross-contamination with the sample, the sample bottles, or the sampling equipment. Field sampling equipment shall be decontaminated in accordance with the Decontamination of Equipment SOP (Appendix A) prior to use. Although sampling should typically be conducted from least to most impacted location, field logistics may necessitate other sample collection priorities. When sampling does not proceed from least to most impacted location, precautions must be taken to ensure that appropriate levels of decontamination are achieved. An example of equipment needed to properly conduct low-flow purging and sampling or volume- averaged groundwater purging and sampling is listed on the example checklist in Table 1 (Appendix B). If a portable generator is used to power the purge pump, it shall be attempted to be located downwind of the well being sampling to avoid cross-contamination of the sample with exhaust from the generator motor. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 2 3.0 PROCEDURES The following sections describe the general operating procedures and methods associated with groundwater sampling. Any variation in these procedures must be approved by the Project Manager (PM) and Quality Assurance/Quality Control (QA/QC) Lead and must be fully documented. Field work cannot progress until deviations are approved or resolved. 3.1 Pre-Job Preparation The information listed below may be reviewed prior to sampling activities, if available, and can be beneficial on-site for reference in the field as necessary: • A list of the monitoring wells to be sampled; • Information describing well location, using site-specific or topographic maps or Global Positioning System (GPS) coordinates and descriptions tied directly to prominent field markers; • A list of the analytical requirements for each sampling location; • Boring logs and well construction details, if available; • Survey data that identify the documented point of reference (V-notch or other mark on well casing) for the collection of depth-to-groundwater and total well depth measurements; • Previous depth-to-groundwater measurements; • Previous pump placement depths (dedicated pumps as well as portable pumps) for each sampling location, if available; • Previous pump settings and pumping and drawdown rates, if available; and • Previous analytical results for each monitoring well, if known. The information above is useful when determining the sampling order, pump intake depth, and purge and recharge rates, and can facilitate troubleshooting. The following activities should be completed prior to mobilizing to the site: • Obtain equipment necessary for completing the sampling activities (see the example checklist in Table 1). • Ensure appropriate laboratory-provided bottles are available for both the required analyses and for QC samples and that there has been thorough coordination with the analytical laboratory. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 3 • Obtain site-specific maps or GPS coordinates showing clearly marked monitoring well locations or groundwater sample points. • Review the project work control documents such as the Ready-To-Work Plan, and appropriate SOPs in an effort to determine project-specific sampling requirements, procedures, and goals. • Verify that legal right-of-entry has been obtained and site access has been granted, where required. • Instruct the field team to avoid discussing project data with the public and to refer questions to the Project Manager. 3.2 Water-Level Measurements Prior to pump placement, an initial depth-to-water level and total well depth should be measured. For monitoring wells screened across the water table, this measurement shall be used to determine the required depth to the pump intake (typically, approximately the mid-point of the saturated screen length for low-flow purging and sampling). The procedure for measuring water levels may include the following: 1) Inspect the well head area for evidence of damage or disturbance. Record notable observations in the field logbook. 2) Carefully open the protective outer cover of the monitoring well noting the presence of bee hives and/or spiders, as these animals are frequently found inside well covers. Remove any debris that has accumulated around the riser near the well plug. If water is present above the top of the riser and well plug, remove the water prior to opening the well plug. Do not open the well until the water above the well head has been removed. 3) If practical, well plugs shall be left open for approximately five minutes to allow the static water level to equilibrate before measuring the water level (if well plugs are vented, then a waiting period is not applicable). 4) Using an electronic water-level indicator accurate to 0.01 feet, determine the distance between the established point of reference (usually a V-notch or indelible mark on the well riser) and the surface of the standing water present in the well. Record these data in the field logbook. Repeat this measurement until two successive readings agree to within 0.01 feet. 5) Using an electronic water-level indicator accurate to 0.01 feet, determine the distance between the established point of reference (usually a V-notch or indelible mark on the well riser) and the bottom of the well. Note that there should not be considerable slack in the water-level indicator cable. Record these data in the field logbook. Repeat this measurement until two successive readings agree to within 0.01 feet. 6) If the monitoring well has the potential to contain non-aqueous phase liquids (NAPLs), probe the well for these materials using an optical interface probe. These wells will be attempted to be identified by the Project Manager prior to Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 4 mobilizing to the well. If NAPL is present, consult the Project Manager for direction on collecting samples for analysis. In general, do not collect groundwater samples from monitoring wells containing NAPL. 7) Decontaminate the water-level indicator (and interface probe, if applicable) and return the indicator to its clean protective casing. 3.3 Well Purging Wells must be purged prior to sampling to ensure that representative groundwater is obtained from the water-bearing unit. If the well has been previously sampled in accordance with this sampling plan, then the depth to the pump intake and the pumping rates should be duplicated to the extent possible during subsequent sampling events. Section 3.3.1 provides a description of low-flow well purging, and Section 3.3.2 provides a description of volume-averaging well purging (in the case it’s needed). 3.3.1 Low-Flow Well Purging Adjustable-rate peristaltic, bladder and electric submersible pumps are preferred for use during low-flow purging and sampling activities. Since purging and sampling are joined together as one continuous operation, care will be given to pump selection as it applies to the specific well conditions and analytes to be tested. Note that a ball valve (or similar valve constructed of polyethylene) may need to be installed to reduce the flow rate to the required level. The low-flow purging and sampling guidance is provided below: 1) Using the specific details of well construction and current water-level measurement, determine the pump intake set depth (typically the approximate mid-point of the saturated well screen or other target sample collection depth adjacent to specific high-yield zones). 2) Attach tubing and supporting rope (if applicable) to the pump and very slowly lower the unit until the pump intake depth is reached. Measure the length of supporting rope required, taking into account the pump length, to attain the required depth. Record the depth to the pump intake in the field logbook. Notes: 1 ) Sampling shall use new certified-clean disposable tubing. 2) Rope shall be clean, unused, dedicated nylon rope. If a pump is to remain in a well as part of a separate monitoring program, then the rope shall be suspended within the well above the water column for future use. If the pump is removed after sample collection, the rope shall be disposed. 3) After allowing time for the water level to equilibrate, slowly lower the electronic water-level probe into the well until the probe contacts the groundwater. Record the water level in the field logbook. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 5 4) If the well has been previously sampled using low-flow purging and sampling methods, begin purging at the rate known to induce minimal drawdown. Frequently check the drawdown rate to verify that minimum drawdown is being maintained. If results from the previous sampling event are not known, begin purging the well at the minimum pumping rate of approximately 100 milliliters per minute (mL/min) (EPA, July 1996). Slowly increase the pumping rate to a level that does not cause the well to drawdown more than about 0.3 feet, if possible. Never increase the pumping rate to a level in excess of 500 mL/min (approximately 0.13 gallon per minute [gpm]). Record the stabilized flow rate, drawdown, and time on the field data sheets. 5) If the drawdown does not stabilize at 100 mL/min (0.026 gpm), continue pumping. However, in general, do not draw down the water level more than approximately 25% of the distance between the static water level and pump intake depth (American Society for Testing and Materials [ASTM], 2011). If the recharge rate of the well is lower than the minimum pumping rate but the drawdown is less than 25% of the distance between the static water level and pump intake depth after three volumes of well water are removed, then collect samples at this point even though indicator field parameters have not stabilized (EPA, July 1996). Commence sampling as soon as the water level has recovered sufficiently to collect the required sample volumes. Otherwise, the Volume-Averaging Well Purging method should be considered.Allow the pump to remain undisturbed in the well during this recovery period to minimize the turbidity of the water samples. Fully document the pump settings, pumping rate, drawdown, and field parameter readings on the Well Sampling / MicroPurge (Low Flow) Log in the field logbook. Note: For wells that either have very slow recharge rates, that draw down excessively (more than 25% of the distance between the static water level and pump intake depth) at the minimum pumping rate (100 mL/min or 0.026 gpm), or require a higher pumping rate (greater than 500 mL/min or 0.13 gpm) to maintain purging, the procedures described above may not apply. For these “special case” wells, the Field Team Leader shall seek guidance from the Project Manager about the appropriate purging and sampling methodologies to be employed (such as volume-averaged purging and sampling described in Section 3.3.2). 6) Once an acceptable flow rate has been established, begin monitoring designated indicator field parameters. Indicator parameters are pH, specific conductance, dissolved oxygen (DO), and turbidity. Although not considered purge stabilization parameters, temperature and oxidation reduction potential (ORP) will be recorded during purging. Base the frequency of the measurements on the time required to completely evacuate one volume of the flow through the cell to ensure that independent measurements are made. For example, a 500-mL cell in a system pumped at a rate of 100 mL/min is evacuated in five minutes; accordingly, measurements are made and recorded on the field data form (Appendix C) approximately five minutes apart. Indicator parameters have stabilized when three consecutive readings, taken at three to five-minute intervals, meet the following criteria (EPA, March 2013): Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 6 • pH ± 0.1 standard unit • Specific Conductance ± 5% in μS/cm • DO ± 0.2 mg/L or 10% saturation • Turbidity less than 10 NTUs The target for monitoring turbidity is readings less than ten nephelometric turbidity units (NTUs). In some instances, turbidity levels may exceed the desired turbidity level due to natural aquifer conditions (EPA, April 1996). When these conditions are encountered, the following guidelines shall be considered. • If turbidity readings are slightly above 10 NTU, but trending downward, purging and monitoring shall continue. • If turbidity readings are greater than 10 NTU and have stabilized to within 10% during three successive readings, attempt to contact the Project Manager prior to collecting the groundwater sample. • If turbidity readings are greater than 10 NTU and are not stable, well sampling shall be based upon stabilization of more critical indicator parameters (such as dissolved oxygen) without attainment of the targeted turbidity. Attempt to contact the Project Manger if this condition is encountered prior to collecting the groundwater sample. • If after 5 well volumes or two hours of purging (whichever is achieved first), critical indicator field parameters have not stabilized, discontinue purging and collect samples. Fully document efforts used to stabilize the parameters (such as modified pumping rates). Note: While every effort should be taken to ensure that indicator parameters stabilize, some indicator parameters are more critical with respect to certain contaminant types. It is important to identify which indicator parameters are most important to the project prior to commencement of field activities so that unnecessarily protracted purge times can be avoided. For example, the critical indicator parameter associated with metals is turbidity. While it is desirable to sample wells when turbidity measurements are less than 5 NTU, Duke Energy recognizes that these values may not be attainable. Duke Energy, and its sub- consultants, have taken multiple steps (e.g., use of pre-packed screens, carefully selected sand pack, etc.) to alleviate the potential for elevated turbidity in newly installed wells. However, even with these conservative and targeted well installation specifications, other naturally occurring conditions (e.g., iron fluctuation) may prevent sampling of wells at turbidity values less than 5 NTU. Following sample collection and laboratory data evaluation, Duke Energy may review these data with respect to turbidity values to determine if additional well development is needed or if well construction has affected groundwater conditions. It may be necessary to redevelop wells from time to time to minimize Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 7 sample turbidity. Fine silt and clay can collect at the base of a well over time. The effect on future sampling events can be reduced by lowering the tubing or pump to the bottom of the well (after all the groundwater samples have been collected) and pumping until the purge water from the bottom of the well screen is clear. Note: If purging of a well does not result in turbidity measurements of 10 NTU or less, the field sampler shall alert the Project Manager. The sampling team will assess options to reduce the turbidity as soon as possible. There are a variety of water-quality meters available that measure the water quality parameters identified above. A multi-parameter meter capable of measuring each of the water quality parameters referenced previously (except for turbidity) in one flow-through cell is required. Turbidity shall be measured using a separate turbidity meter or prior to flow into the flow through cell using an inline T-valve, if using one multi-meter during purging. The water quality meter (and turbidity meter) shall be calibrated as per manufacturer’s instructions. Calibration procedures shall be documented in the project field logbook including calibration solutions used, expiration date(s), lot numbers, and calibration results. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 8 3.3.2 Volume-Averaging Well Purging For wells that either have very slow recharge rates, that draw down excessively at the minimum pumping rate (100 mL/min or 0.026 gpm), or require a higher pumping rate (greater than 500 mL/min or 0.13 gpm) to maintain purging (i.e., low-flow well purging and sampling is not appropriate), the volume-averaging well purging and sampling method may be used. The Field Team Leader shall seek approval from the Project Manager before utilizing the volume-averaging method instead of the low-flow method. 3.3.2.1 CALCULATE PURGE VOLUMES Based on the depth-to-water (DTW) and total depth (TD) measurements, the volume of standing water in the well must be calculated using the following procedures. 1) Subtract DTW from TD to calculate the length of the standing water column (Lwc) in the well. ܶܦ െ ܦܹܶ ൌ ܮ௪௖ 2) Multiply the length of the standing water column by the volume calculation (gallon per linear foot of depth) based on the inner casing diameter (see example list below) to determine the total standing water volume; this represents one well volume. ܸ௪ = ܮ௪௖ ൈʹߨݎଶ 1-inch well = 0.041 gallon per linear foot 2-inch well = 0.163 gallon per linear foot 4-inch well = 0.653 gallon per linear foot 6-inch well = 1.469 gallons per linear foot 8-inch well = 2.611 gallons per linear foot 3) Multiply the well volume calculated in the previous step by three and five to obtain the approximate respective total purge volume (the target purge volume is between three and five standing well volumes). For wells with multiple casing diameters (such as open bedrock holes), calculate the volume for each segment. Take the sum of the values and multiply by three and five to determine the minimum and maximum purge volumes, respectively. 4) Fully document the volume calculation in the field logbook or on the Groundwater Sampling Field Sheets. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 9 3.3.2.2 PURGE THE MONITORING WELL Determine the appropriate pump to be used for purging—the preferred and most commonly used methods involve the use of a surface centrifugal or peristaltic pump whenever the head difference between the sampling location and the water level is less than the limit of suction and the volume to be removed is reasonably small. Where the water level is below the limit of suction or there is a large volume of water to be purged, use the variable speed electric submersible pump as the pump of choice (EPA, 2013). In some cases (shallow wells with small purge volumes), purging with a bladder pump may be appropriate. Once the proper pump has been selected: 1) Set the pump immediately above the top of the well screen or approximately three to five feet below the top of the water table (EPA, 2013). 2) Lower the pump if the water level drops during purging. Note: Use new certified-clean disposable tubing for purging and sampling. Note: Although volume-averaged sampling involves purging a specified volume of water (such as three to five well volumes) rather than basing purge completion on the stabilization of water quality indicator parameters, measuring and recording water-quality indicator parameters during purging provides information that can be used for assessment and remedial decision-making purposes. Indicator parameters are pH, specific conductance, DO, and turbidity as described in Section 3.3.1. Temperature and ORP will also be recorded during purging. 3) During well purging, monitor the discharge rate using a graduated cylinder or other measuring device, water-quality indicator parameters (if desired), and DTW as follows: • Initially, within approximately three minutes of startup, • Approximately after each well volume is purged, and then • Before purge completion. 4) Record pump discharge rates (mL/ min or gpm) and pump settings in the field logbook. Also, record any changes in the pump settings and the time at which the changes were made. 5) Maintain low pumping rates to avoid overpumping or pumping the well to dryness, if possible. If necessary, adjust pumping rates, pump set depth, or extend pumping times to remove the desired volume of water. 6) Upon reaching the desired purge water volume, turn off the purge pump. Do not allow the water contained in the pump tubing to drain back into the well when the pump is turned off. Use an inline check valve or similar device, or if using a peristaltic pump, remove the tubing from the well prior to turning off the pump. It is Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 10 preferred to collect samples within two hours of purging, but acceptable for collection up to 24 hours of purging. Do not collect samples after 24 hours of purging. Note: The removal of three to five well volumes may not be practical in wells with slow recovery rates. If a well is pumped to near dryness at a rate less than 1.9 L/min (0.5 gpm), the well shall be allowed to completely recover prior to sampling. If necessary, the two-hour limit may be exceeded to allow for sufficient recovery, but samples should be collected within 24 hours of purge completion. 3.4 Sampling 3.4.1 Low-Flow Sampling Following are the procedures for the collection of low-flow groundwater samples. These procedures apply to sample collection for unfiltered and filtered samples using a 0.45 micron filter. See Appendix A for use of 0.1 micron filtered samples. 1) Record the final pump settings in the field logbook prior to sample collection. 2) Measure and record the indicator parameter readings prior to sample collection on both the stabilization form and in the field logbook. 3) Record comments pertinent to the appearance (color, floc, turbid) and obvious odors (such as sulfur odor or petroleum hydrocarbons odor) associated with the water. 4) Arrange and label necessary sample bottles and ensure that preservatives are added, as required. Include a unique sample number, time and date of sampling, the initials of the sampler, and the requested analysis on the label. Additionally, provide information pertinent to the preservation materials or chemicals used in the sample. 5) Collect samples directly from pump tubing prior to the flow-through cell or via the in-line T-valve used for turbidity measurements (as described Section 3.3.1 (6) above). Ensure that the sampling tubing remains filled during sampling and attempt to prevent water from descending back into the well. Minimize turbulence when filling sample containers, by allowing the liquid to run gently down the inside of the bottle. Fill the labeled sample bottles in the following order: • Metals and Radionuclides, • Filtered Metals and Radionuclides, if required, and then • Other water-quality parameters. 6) Seal each sample and place the sample on ice in a cooler to maintain sample temperature preservation requirements. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 11 7) Note the sample identification and sample collection time in field logbook and on Chain-of-Custody form. 8) Once sampling is complete, retrieve the sample pump and associated sampling equipment and decontaminate in accordance with procedures outlined in the Decontamination of Equipment SOP (Appendix A). 9) Close and secure the well. Clean up and remove debris left from the sampling event. Be sure that investigation-derived wastes are properly containerized and labeled, if applicable. 10) Review sampling records for completeness. Add additional notes as necessary. 3.4.2 Sampling after Volume-Averaging Purge The procedures described below are for the collection of groundwater samples after a volume-averaged purge has been conducted. Volume- averaging purge methods are described in Section 3.3.2. 1) If sampling with a pump, care shall be taken to minimize purge water descending back into the well through the pump tubing. Minimize turbulence when filling sample containers by allowing the liquid to run gently down the inside of the bottle. Fill the labeled sample bottles in the following order: • Metals and Radionuclides, • Filtered Metals and Radionuclides, if required, and then • Other water-quality parameters. 2) If sampling with a bailer, slowly lower a clean, disposable bailer through the fluid surface. Retrieve the bailer and fill the sample bottles as described above. Care shall be taken to minimize disturbing the sample during collection. 3.5 Sample Handling, Packing, and Shipping Samples shall be marked, labeled, packaged, and shipped in accordance with the sections outline below. 3.5.1 Handling The samples will be stored in coolers for transport to the site. Collected samples will be placed on ice in the sampling coolers for pickup or transport to the laboratory for analysis. 3.5.2 Sample Labels All sample containers will be new, laboratory cleaned and certified bottles. The bottles will be properly labeled for identification and will include the following information: • Project Site/ID Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 12 • Sample identifier (Well ID) • Name or initials of sampler(s) • Date and time of collection • Analysis parameter(s)/method • Preservative 3.5.3 Chain-of-Custody Record Sample transport and handling will be strictly controlled to prevent sample contamination. Chain-of-Custody control for all samples will consist of the following: • Sample containers will be securely placed in coolers (iced) and will remain under the supervision of project personnel until transfer of the samples to the laboratory for analysis has occurred. • Upon delivery to the laboratory, the laboratory director or his designee will sign the Chain-of-Custody control forms and formally receive the samples. The laboratory will ensure that proper refrigeration of the samples is maintained. The Chain-of-Custody document contains information which may include: • Client name • Client project name • Client contact • Client address • Client phone/fax number • Sampler(s) name and signature • Signature of person involved in the chain of possession • Inclusive dates of possession • Sample identification • Sample number • Date & time of collection • Matrix • Type of container and preservative • Number of containers • Sample type - grab or composite • Analysis parameter(s)/ method • Internal temperature of shipping container upon opening in the laboratory 3.6 Field Quality Control Samples Field quality control involves the routine collection and analysis of QC blanks to verify that the sample collection and handling processes have not impaired the quality of the samples. Duke Energy | Low Flow Groundwater Sampling Plan 3.0 PROCEDURES 13 • Equipment Blank – The equipment blank is a sample of deionized water, which is taken to the field and used as rinse water for sampling equipment. The equipment blank is prepared like the actual samples and returned to the laboratory for identical analysis. An equipment blank is used to determine if certain field sampling or cleaning procedures result in cross-contamination of site samples or if atmospheric contamination has occurred. One equipment blank sample will be prepared per day or per 20 groundwater samples, whichever is more frequent. Field and laboratory QA/QC also involves the routine collection and analysis of duplicate field samples. These samples are collected at a minimum rate of approximately one per 20 groundwater samples per sample event. A field duplicate is a replicate sample prepared at the sampling locations from equal portions of all sample aliquots combined to make the sample. Both the field duplicate and the sample are collected at the same time, in the same container type, preserved in the same way, and analyzed by the same laboratory as a measure of sampling and analytical precision. 3.7 Field Logbook Documentation Field logbooks shall be maintained by the Field Team Leader to record daily activities. The field logbook may include the following information for each well: • Well identification number • Well depth • Static water level depth • Presence of immiscible layers (yes – no) • Estimated well yield, if known • Purge volume and purge pumping rate • Time well purge began and ended • Well evacuation procedure and equipment • Field analysis data • Climatic conditions including air temperature • Field observations on sampling event • Well location • Name of collector(s) • Date and time of sample collection • Sampling procedure • Sampling equipment • Types of sample containers used and sample identification numbers • Preservative used Duke Energy | Low Flow Groundwater Sampling Plan 4.0 REFERENCES 14 The Field Team Leader shall review the field logbook entries for completeness and accuracy. The Field Team Leader is responsible for completion of the required data collection forms. Example field logs are in Appendix C. 3.8 Decontamination and Waste Management Sampling equipment decontamination shall be performed in a manner consistent with the Decontamination of Equipment SOP (Appendix A). Decontamination procedures shall be documented in the field logbook. Investigation-derived wastes produced during sampling or decontamination shall be managed in accordance with State and Station-specific rules for disposal of wastes. 4.0 REFERENCES American Society for Testing and Materials (ASTM). Standard Practice for Low-Flow Purging and Sampling for Wells and Devices Used for Ground-Water Quality Investigations, D 6771-02. 2011. Test Methods for Evaluating Solid Waste - Physical/Chemical Methods (SW-846), Third Edition. U.S. Environmental Protection Agency. Update I, II, IIA, IIB, III, IIIA, IVA and IVB. United States Environmental Protection Agency (EPA), Office of Research and Development, Office of Solid Waste and Emergency Response. Ground Water Issue, “Low-Flow (Minimal Drawdown Sampling Procedures). Document Number EPA/540/S- 95/504,” April 1996. U.S. EPA. Region 4, Groundwater Sampling Operating Procedure. Document Number SESDPROC-301-R3, November 2013. U.S. EPA. Region I, Low Stress (Low Flow) Purging and Sampling Procedure for the Collection of Ground Water Samples from Monitoring Wells, Revision 2, July 1996. Duke Energy | Low Flow Groundwater Sampling Plar Decontamination of Equipment SOP 15 A Decontamination of Equipment SOP Duke Energy | Low Flow Groundwater Sampling Plar Purpose & Application 16 1.0 Purpose & Application This procedure describes techniques meant to produce acceptable decontamination of equipment used in field investigation and sampling activities. Variations from this SOP should be approved by the Project Manager prior to implementation and a description of the variance documented in the field logbook. 2.0 Equipment & Materials • Decontamination water, • Alconox detergent or equivalent non-phosphate detergent • Test tube brush or equivalent • 5-gallon bucket(s) • Aluminum foil • Pump 3.0 Procedure 3.1 Decontamination of Non-Disposable Sampling Equipment Decontamination of non-disposable sampling equipment used to collect samples for chemical analyses will be conducted prior to each sampling as described below. Larger items may be decontaminated at the decontamination pad. Smaller items may be decontaminated over 5-gallon buckets. Wastewater will be disposed in accordance with applicable State and Station-specific requirements. 1. Alconox detergent or equivalent and water will be used to scrub the equipment. 2. Equipment will be first rinsed with water and then rinsed with distilled/deionized water. 3. Equipment will be air dried on plastic sheeting. 4. After drying, exposed ends of equipment will be wrapped or covered with aluminum foil for transport and handling. 3.2 Decontamination of Field Instrumentation Field instrumentation (such as interface probes, water quality meters, etc.) will be decontaminated between sample locations by rinsing with deionized or distilled water. If visible contamination still exists on the equipment after the rinse, an Alconox (or equivalent) detergent scrub will be added and the probe thoroughly rinsed again. Decontamination of probes and meters will take place in a 5-gallon bucket. The decontamination water will be handled and disposed in accordance with applicable State and Station-specific requirements. Duke Energy | Low Flow Groundwater Sampling Plar 3.0 Procedure 17 3.3 Decontamination of Groundwater Sampling Equipment Non-disposable groundwater sampling equipment, including the pump, support cable and electrical wires in contact with the sample will be thoroughly decontaminated as described below: 1. As a pre-rinse, the pump will be operated in a deep basin containing 8 to 10 gallons of water. Other equipment will be flushed with water. 2. The pump will be washed by operating it in a deep basin containing phosphate- free detergent solution, such as Alconox, and other equipment will be flushed with a fresh detergent solution. Detergent will be used sparingly, as needed. 3. Afterwards, the pump will be rinsed by operating it in a deep basin of water and other equipment will be flushed with water. 4. The pump will then be disassembled and washed in a deep basin containing non-phosphate detergent solution. All pump parts will be scrubbed with a test tube brush or equivalent. 5. Pump parts will be first rinsed with water and then rinsed with distilled/deionized water. 6. For a bladder pump, the disposable bladder will be replaced with a new one for each well and the pump reassembled. 7. The decontamination water will be disposed of properly. 3.4 Materials from Decontamination Activities All wastewater and PPE generated from decontamination activities will be handled and disposed in accordance with applicable State and Station-specific requirements. Duke Energy | Low Flow Groundwater Sampling Plar Sampling Equipment Check List – Table 1 18 B Sampling Equipment Check List – Table 1 Duke Energy | Low Flow Groundwater Sampling Plar Sampling Equipment Check List – Table 1 19 Table 1: Suggested Groundwater Sampling Equipment & Material Checklist Item Description Check Health & Safety Nitrile gloves Hard hat Steel-toed boots Hearing protection Field first-aid kit Fire Extinguisher Eyewash Safety glasses Respirator and cartridges (if necessary) Saranex™/Tyvek® suits and booties (if necessary) Paperwork Health and Safety Plan Project work control documents Well construction data, location map, field data from previous sampling events Chain-of-custody forms and custody seals Field logbook Measuring Equipment Flow measurement supplies (for example, graduated cylinder and stop watch) Electronic water-level indicator capable of detecting non-aqueous phase liquid Sampling Equipment GPS device Monitoring well keys Tools for well access (for example, socket set, wrench, screw driver, T-wrench) Laboratory-supplied certified-clean bottles, preserved by laboratory (if necessary) Appropriate trip blanks and high-quality blank water Sample filtration device and filters Submersible pump, peristaltic pump, or other appropriate pump Appropriate sample and air line tubing (Silastic®, Teflon®, Tygon®, or equivalent) Stainless steel clamps to attach sample lines to pump Pump controller and power supply Oil-less air compressor, air line leads, and end fittings (if using bladder pump) In-line groundwater parameter monitoring device (for example, YSI-556 Multi- Parameter or Horiba U-52 water quality meter) Turbidity meter Bailer Calibration standards for monitoring devices Duke Energy | Low Flow Groundwater Sampling Plar Field Logbook/Data Sheets 20 C Field Logbook/Data Sheets Duke Energy | Low Flow Groundwater Sampling Plar Field Logbook/Data Sheets 21 Groundwater Potentiometric Level Measurement Log Well Number Time Depth to Water (ft)* Depth to Bottom (ft)* Water Column Thickness (ft) Reference Point Elevation (ft, MSL) Potentiometric Elevation (ft, MSL) Remarks Field Personnel: Checked By: * - Measurements are referenced from the top of the PVC inner casing (TOC) for each respective monitoring well. TOCs shall be surveyed by a Professional Land Surveyor and referenced to NAVD88. Duke Energy | Low Flow Groundwater Sampling Plar Field Logbook/Data Sheets 22 Well Sampling / MicroPurge Log Project Name: Sheet: of Well Number: Date: Well Diameter: Top of Casing Elevation (ft, MSL): Pump Intake Depth (ft): Total Well Depth (ft): Recharge Rate (sec): Initial Depth to Water (ft): Discharge Rate (sec): Water Column Thickness (ft): Controller Settings: Water Column Elevation (ft, MSL): Purging Time Initiated: 1 Well Volume (gal): Purging Time Completed: 3 Well Volumes (gal): Total Gallons Purged: WELL PURGING RECORD Time Volume Purged (gallons) Flow Rate (mL/min) Depth to Water (ft) Temperature (°C) pH (s.u.) Specific Conductance (mS/cm) Dissolved Oxygen (mg/L) ORP (mV) Turbidity (NTU) Comments Stabilization Criteria Min. 1 Well Volume + 3°C + 0.1 + 3% + 10% + 10 mV < 5 NTU or + 10 % if > 5 NTU GROUNDWATER SAMPLING RECORD Sample Number Collection Time Parameter Container Preservative Duke Energy | Low Flow Groundwater Sampling Plar Field Logbook/Data Sheets 23 DAILY FIELD REPORT Project Name: Field Manager:Field Personnel:Date: Weather: Labor Hours Equipment Materials Field Observations: Submitted by:Reviewedby: