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6-foot tall chain-link fence with barbed wire The RAP Amendment proposes the <br /> attached at the top. Even though there are following: <br /> two Yards, we consider this one site and will <br /> refer to it as one site throughout this fact - Inserting injection wells in the North <br /> sheet. Past operations (mostly wood Yard and in some off Site locations. <br /> treating) at the Site resulted in contamination <br /> of soil with copper, chromium and arsenic, Injecting a chemical solution <br /> and groundwater with chromium. Depending consisting of calcium polysulfide and <br /> on the length of time and the type and ethanol in water into each injection <br /> amount of exposure, these contaminants well at varying depths and <br /> could have an impact on human health. concentrations depending on the <br /> chromium concentrations in <br /> History and Background groundwater. <br /> From May 18 through June 19, 1990 a draft <br /> Remedial Action Plan (draft RAP) proposing The chemical solution will then <br /> how to clean up surface soils, pipes and remove the chromium from the <br /> culverts, subsurface soils, and groundwater groundwater by turning it into an <br /> at the Site was made available for public insoluble form of chromium. <br /> review and comment. In June, 1990, the <br /> draft RAP was approved and cleanup of _ The insoluble form of chromium <br /> these areas began. Arsenic contaminated remains with the subsurface soil. <br /> surface soils were excavated to an off-site <br /> disposal facility. Contaminated sediments in _ Groundwater will be sampled on a <br /> the pipes and culverts were cleaned out and routine basis to evaluate how well <br /> sent to an off-site disposal facility. this treatment is working. <br /> Subsurface soils were addressed by <br /> replacing a synthetic liner used to capture In addition to those activities, soil flushing <br /> fluid leaking in the retort pit (pressure vessel with water will also occur at the Site. Soil <br /> used for wood treatment) with an upgraded flushing involves: <br /> liner and installation of a leak detection <br /> system. Groundwater cleanup included Installing five horizontal flushing <br /> expansion of an on-site water treatment wells beneath the former retort pit <br /> plant, installation of groundwater extraction and below the arsenic contaminated <br /> systems, and groundwater monitoring to soil. <br /> ensure that the extraction systems were <br /> working properly. In addition, private well The wells will be used to flush <br /> owners in the area affected by the chromium from soil into <br /> groundwater contamination were provided groundwater. <br /> with an alternative water supply. <br /> The flushed chromium in water will <br /> Why is the Remedial Action Plan Being be treated underground with the <br /> Amended? chemical solution. <br /> The RAP is being amended because the <br /> owner of the Site wants to use new Personnel will routinely inspect all above <br /> technology in the cleanup of groundwater. If ground piping, fittings, and equipment <br /> this technology is successful, it could mean and monitor to ensure that the treatment <br /> that groundwater would be cleaned up is working properly. <br /> sooner. <br />