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Home My WebLink AboutBelews Creek PT Work Plan 7-31-20 FINALOr '- CAP Pilot Test Work Plan Belews CreeK steam Station (July 2020) FMagog xp1R _ 3 DUKE ENERGY Introduction/Work Plan Objectives Selected Remedy Design Overview Pilot Test Basis of Design Pilot Test Data Collection Objectives Implementation Schedule Pilot test is a significant portion of the full-scale corrective action implementation —1 /4 of overall system Pilot test implementation and data collection activities Flow rates, area of hydraulic influence, and well spacing Constituent of Interest (COI) data Applied to full-scale system to optimize performance Objectives Accelerate the corrective action process to meet applicable groundwater standards Focus the pilot test on the most challenging area at the Site to make immediate progress Optimize the full-scale corrective action system performance based on data collected 3 M1Y-12 ■ IX-16 VIVA. IX-13 s 4rvaa C d ExaT IY�i6 ` O IX F-1 > l �. 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Duke Energy Carolinas Belem Creek Plant Site Boundary Ash Basin Geographic Limttation ----- Unnamed Unpaved Roads 75U Contour Line OY interval) — Intelmetliate Contour Line (4' interval; ❑ Existing Extraction Well S Effectiveness Monitoring Well Proposed Pilot Test Clean Water Infiltration Well C Proposed PiM Test Exractien `Aei A Proposed Full -Scale System Clean Water Infiltration Well Proposed Full Scale System Extinction Well Extraction Well Piping Injection Well Piping C � Area of Pipe Crossing, Concrete Encased Proposed Groundwater Extraction Discharge Line Proposed Clean Water Infiltration Supply Line (by others) FE- F' I GY.'h2C5 f . GSu42do �� GSYY2iPR �Ti'� 7 T I i S '�,'� r OT}i�F�.4; PART OF •''� 4 jt �� .til •. '� � . G�-PNZi7E9�PEj �i 5 4 L I4 j ON CONCRETE PAD R; \ MLMATIONWAT71 .� 1. `•�* �� /, TREAT61c NT A.4A •. ! r i.`+Q1`AQ 1UL-A�' RLOT`� J GYlF7iETi - r PTF-T AAER`�,�,z , ---LD7 TESTIPffI�TRAT}7!1 AC CESM ` MTERIJA}Yr-0LD9nIL91FY PANT Pilot Test 23 groundwater extraction wells 23 clean water infiltration wells Extraction Rate: 37 gpm Infiltration Rate: 37 gpm Note: Sampling results of data collection wells may result in changes to pilot test design Fiill_Scalp 100 groundwater extraction wells 74 clean water infiltration wells ElProposed Data Collection Area Modeled Boron Concentration 4 Design Elements -1 1 N Remediation Goals Meet applicable groundwater criteria at and beyond the Geographic Limitation. Design Objectives Evaluate groundwater extraction/clean water infiltration rate, C01 concentration, Groundwater Draw -Down, Groundwater Zone of Capture, Extraction and Injection well spacing. Design Philosophy Design considerations include control and monitoring enclosures, groundwater extraction equipment, well pump control, well level monitoring, flow monitoring, conveyance, existing utilities/infrastructure, secondary containment, service life, flexibility of equipment, redundancy (spare piping, equipment, etc.), operations and maintenance, and winterization. Instrumentation/Controls Controls Requirements: fail safes to prevent spills/equipment damage and over pressurization, remote monitoring, integration with facility operations, and modular building communications. Extraction Wells Design specifications: number of wells, flow rate, diameter of borehole, material of construction, well pumps, well vaults, and instrumentation. Clean Water Infiltration Wells Design specifications: number of wells, flow rate, diameter of borehole, material of construction, well vaults, riser pipe, and instrumentation. Infiltration Water Treatment Treat surface water from fire service water main prior to conveying to infiltration wells (source: Belews Lake). System Control and Monitoring Construction and holding tanks. Enclosure 5 Overall goal: Generate data needed to verify and refine the design and operation of the full- scale groundwater corrective action system. Data collection will focus on performance monitoring to verify conceptual design details, including: Well Performance - specific capacity (flow rate divided by drawdown) will be analyzed to select wells for further hydraulic testing. Area of Hydraulic Influence and Connectivity - verify hydraulic parameters, horizontal and/or vertical hydraulic gradient control, and influence of clean water infiltration in pore volume exchange. COI Concentration Monitoring - baseline and performance monitoring. Hydrogeology Verification and Constructability - verify subsurface conditions and to test well constructability. Adjust the full-scale extraction well and/or clean water infiltration well design locations. 11 Infiltration source water analyses for Site COls and geochemical parameters: Initial surface water sample collected for design purposes confirm COIs all below applicable criteria Monitoring plan in preparation Constituents Analyzed: COIs: boron, chloride, lithium, cobalt, manganese, thallium, arsenic, beryllium, strontium, iron, TDS Potential water treatment parameters: pH, ORP, DO, temperature, hardness, alkalinity, bacterial counts, etc. Geochemistry: sulfate, calcium, magnesium, fluoride, aluminum, phosphorus, etc. Other Parameters: VOCs, SVOCs, other metals 7 Schedule Well Construction Post -Well Construction Test / Method Field Packer Testing Geophysical Analysis Well Development Hydraulic Conductivity Testing/Monitoring Effectiveness Monitoring Data Field - Boron, Iron, and TDS Laboratory - Boron Gamma/SP/Caliper /Optical -Acoustic Televiewer Up to 15 wells. Pending field data, additional packer sampling may be recommended. 20% of field samples Field/Laboratory: Boron, Iron, and TDS New extraction and infiltration wells. Specific Capacity (gpm/ft) New extraction and infiltration wells. Slug Testing / Step -Testing (-4hrs/test) '— 20% of locations: 12 wells. Water Level Monitoring Groundwater sampling Potentiometric Data / Groundwater Capture Wells TBD: Baseline, Pre -Startup, and routine monitoring for COls, groundwater extraction and infiltration rates. s Permits ■ Erosion and Sediment Control Permit (July 2020) —hermit received with adjustments for sedimentation pond ■ Groundwater Recovery Well Permit (July 2020) —Permit receivea ■ UIC Permit (June 2020) —Submitted. request for Aaufflonal Info Received from NCDEQ on 7/13/2020. Response in process. SchedulE ■ Begin monitoring, extraction and clean water infiltration well network installation — August 2020 ■ Final Bid Documents — August/September 2020 ■ Contracting — September 2020 ■ Extraction and clean water infiltration well network installation Complete — November 2020 ■ Extraction well hydraulic testing complete — January 2021 ■ Construction of extraction and clean water infiltration systems complete — March 2021 ■ Pilot System start-up — April 2021 ■ EMP implementation and pilot test data collection — following start-up ■ Data collection period up to 6 months ■ Scale -up activities - TO 9