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Install and operate a system to flush deep <br /> soils with water to enhance the removal of <br /> hexavalent chromium in the pore water. <br /> Monitor the deep soils for wood treating <br /> chemicals. <br /> NOTE, MCTC has proposed to discontinue use of all hazardous <br /> materials during their wood treatment process. Should the <br /> wood treating process be discontinued by July 1, 1991, <br /> replacement of the retort liner will not be necessary. The <br /> flushing process would however continue. <br /> Should a non-hazardous material be substituted for current <br /> wood treatment material, all measures presented above (and <br /> any other applicable requirement) will have to be met. <br /> Additionally, implementation of the proposed flushing option <br /> is projected to take a maximum of 5 years. Upon cessation <br /> of the flushing alternative, MCTC will be responsible to <br /> submit a closure plan for the retort pit which complies with <br /> all statutory requirements, including federal Resource <br /> Conservation and Recovery Act (RCRA) standards. <br /> Groundwater <br /> Expand the onsite Water Treatment Plant as <br /> necessary in connection with an increased <br /> withdrawl rate. The current estimate <br /> required to capture the ground water plume is <br /> 500 gpm. <br /> - Install and operate a groundwater extraction <br /> and treatment system. <br /> - Provide alternative water supply to users of <br /> private wells affected by the MCTC ground <br /> water contamination. <br /> Monitor groundwater for effectiveness of <br /> implemented remedy. <br /> NOTE, due to regional overdraft of ground water resources, <br /> all options to re-use treated ground water are being <br /> evaluated by state and local agencies. Currently, the draft <br /> RAP proposes to discharge effluent to the Stockton Diverting <br /> Canal (located to the east of the MCTC site) . While limited, <br /> this option will provide- <br /> 0 infiltration of water resources into the <br /> underlying aquifer, <br /> o seasonal use of discharged water for irrigation. <br /> ES-6 <br />