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i <br /> U. S. Army Corps of Engineers <br /> frt r <br /> +s Example Remediation System Evaluation <br /> Ground Water Extraction System Report <br /> 1 0 Introduction <br /> 1 1 Purpose The District was tasked to perform an evaluation of the large ground water <br /> extraction system ("main plume" or "project area") at the site The system was chosen because of its <br /> size and operating costs The evaluation was intended to verify the protectiveness of the system in <br /> compliance with the National Contingency Plan, to identify potential cost savings in operations and <br /> maintenance, to confirm the validity and presence of an exit strategy for the system, and to verify <br /> adequate maintenance of Government-owned equipment <br /> 1 2 Team Composition Representatives of District (or contractor) performed the <br /> evaluation The participants included <br /> Name, Title, Organization <br /> 1 3 Documents Reviewed The team reviewed the following documents <br /> Title, Date, Source or Author <br /> 1 4 Persons Contacted <br /> Name, Title, Organization/Vendor, etc <br /> 2 Site Location, History, Characteristics (brief summary) <br /> 2 1 Potential Sources and Description of Groundwater Plume Discharges to the Industrial <br /> Waste Lagoon (and the ditches that fed it) from operations within the Industrial Area and possibly other <br /> sources have created a plume of chlorinated organics in ground water Operations in the Industrial Area <br /> primarily consisted of vehicle maintenance which entailed metal plating, sandblasting, vapor degreasing <br /> of vehicle parts, and engine re-manufacturing Effluent from the industrial area discharged to four <br /> ".in�inp� ^••P,. ditches The n"""g in * <br /> " <br /> PCP f",T, "'t",IPC VUPrP dlrPrtPd min a single inibned &Iib that <br /> terminated at the Industrial Waste Lagoon (IWL), an open, unlined impoundment Effluent was an <br /> aqueous solution, reaching up to 140,000 gallons per day(gpd) at its peak As a result of this operation, <br /> ground water beneath the discharge ditches and the IWL became impacted with the contaminants of <br /> concern (CDCs), primarily trichloroethene (TCE), carbon tetrachloride, and 1,1 dichloroethane (1,1, <br /> DCA) <br /> 2 2 Plume Description The main plume is approximately 3 miles in length and 2 mile wide The <br /> Plume extended approximately 1,500 feet north of the Installation boundary Vertically the plume has <br /> 06/07/99 <br /> Page 1 of 14 <br />