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Geosyntec <br /> consultants <br /> monitoring data suggests that additional VOC removal is technically impracticable with additional <br /> SVE. <br /> 4.6 Potential Future ISCO Scope of Work <br /> Implementation of ISCO may be implemented at the Site in the future based on results of SVE <br /> operation and additional groundwater sampling results as discussed above. <br /> The ISCO approach for the northern parking lot will be similar to that used for the ISCO injections <br /> implemented in the Former Source Area in 2019 (Geosyntec, 2020). Three direct-push injection <br /> points will be installed using a Geoprobe® rig to deliver KNInO4 to depths ranging between 40 <br /> and 70 feet bgs approximately 10 feet upgradient of MW-007A. An injection trailer equipped with <br /> a KMn04 mixing system, injection pump, and injection manifold will be used to prepare and <br /> deliver an approximately 2 percent KMnO4 injection solution. The injection manifold will be <br /> equipped with pressure gauges, flow meters, and totalizers to measure injection pressures, flow <br /> rates,and volume at each location. It is estimated that each location will receive up to 7,500 gallons <br /> of KMn04 depending on the number of transmissive zones within each injection point. <br /> Performance monitoring groundwater samples will be collected from MW-007A on a quarterly <br /> basis for four quarters following which monitoring will be conducted in accordance with the <br /> approved sitewide groundwater monitoring program. The samples will be analyzed for VOCs, <br /> KMn04, hexavalent chromium, total potassium, total chromium, and total dissolved solids. <br /> 4.7 Waste Management <br /> Soil cuttings from drilling activities will be containerized in appropriately labeled drums and <br /> characterized for waste disposal. Upon receipt of the waste characterization results, a licensed <br /> waste-hauler will be contracted for disposal at an appropriate off-Site disposal facility. <br /> Decontamination water generated during drilling activities and any condensate generated from <br /> SVE activities will be containerized and processed through the existing on-Site groundwater <br /> treatment system. <br /> Northern Parking Lot Remedial Plan 9 August 6,2021 <br />