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04 February 2004 <br /> AGE-NC Project No 95-0173 <br />' Page 10 of 10 <br />' a ground water pump-and-treat system should (1) augment the IAS clean-up efforts in Hydrologic <br /> Unit I, (2) inhibit further migration of petroleum hydrocarbon-impacted ground water off-site <br /> (implement hydraulic control), and (3) Immediately reduce the mass of the existing plume, and <br />' provide Immediate relief and protection for the municipal drinking water well located only 650 feet <br /> toward the northeast (down-gradient) of the site <br />' 6.0. RECOMMENDATIONS <br />' As part of the Corrective Action Plan (CAP) for the site, performance of the ground water aquifer <br /> pumping test was performed in July 2003 to evaluate ground water `pump-and-treat' as a potential <br /> remediation options for ground water at the site Based on the results of the July 2003 ground water <br />' aquifer pumping test, AGE recommends augmenting the existing corrective action plan at the site <br /> ARemedial Action WorkPlan Addendum should be prepared to address petroleurn-Impacted ground <br /> water in Hydrologic Unit 2 by extracting ground water from EW-1 at approximately 5 GPM Based <br /> ton the site's estimated radius of influence of at least 62 feet and site specific aquifer characteristics <br /> inferred from the pumping test, AGE believes that ground water extraction from well EW-1 at <br /> 5 GPM will effectively stabilize the ground water plume and inhibit further migration of petroleurn- <br /> lie impacted ground water off-site <br />' Extracted ground water from EW-1 could be treated through an on-site ground water pump-and-treat <br /> system The pump and treat system should consist of at least three 2,000-pound media canisters of <br /> granular activated carbon(GAC)to address dissolved TPH-g,BTEX, 1,2-DCA and fuel oxygenated <br />' compounds in extracted ground water Following treatment,water could then be discharged into the <br /> City of Stockton sanitary sewer system under a City of Stockton Public Works permit to discharge <br /> 7.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing In this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this Investigation are made from a limited number <br /> of available data points(soil samples, Solinst Levelogger data,ground water samples,ground water <br /> monitoring data), and subsurface conditions may vary away from these data points No other <br />' warranty, expressed or implied, is made as to the professional recommendations contained in this <br /> report <br /> • Advanced GeoEnvironmental,Inc <br /> 1 <br /> 1 <br />