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Source areas <br />for off-site <br />plume <br />Site D (dump) <br />Site G (dump) <br />Building 502 <br />On-site <br />Groundwater <br />Cleanup <br />Remediation wells <br />along SW boundary <br />and near source areas <br />pump TCE-impacted <br />groundwater to on-site <br />treatment system. <br /> <br />Over 213,000 lbs of <br />VOCs removed from <br />GW since system <br />started in 1987. <br /> <br />Treated water is <br />discharged into on-site <br />gravel pit, where it <br />recharges aquifer. <br /> <br /> <br />Treatment system <br /> •Since system start -up <br />in 1987, TCE plume has <br />shrunk in size and <br />concentration. <br /> •Map shows plume <br />boundary in 1990 <br />(blue dash) compared <br />to 2009 (yellow). <br /> •Plume boundary <br />defined by TCE <br />concentration of 1 part <br />per billion (ppb) <br /> <br /> <br /> <br />Shrinking Plume <br />28