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SITE CONCEPTUAL MODEL <br /> . Former Shell Service Station/Econo Gas Station <br /> 880 Victor Road, Lodi, California <br /> 2 8 Groundwater Flow Direction, Groundwater flow direction is predominantly to the <br /> Depth Trends and Gradient east/southeast Depth to water ranges from 46 7 to 53 5 fbg <br /> Trends <br /> 2 9 Stratigraphy and Hydrogeology The site is underlain primarily by alternating layers of silts and <br /> sands or silty sands to the total explored depth of 100 fbg <br /> The first-encountered groundwater zone is unconfined <br /> 2 10 Preferential Pathways Analysis No analysis has been performed However, due to <br /> groundwater depth (at least 46 7 fbg), it is highly unlikely that <br /> any utility trenches would act as a preferential pathway for <br /> impacted water <br /> 2 11 Other Pertinent Issues Shell ceased operations at the site during December 1998 <br /> and sold the station and property to the current owner during <br /> March 2001,who currently operates an Econo Gas station <br /> onsite <br /> MEE <br /> 31 Remedial Actions Taken During the 1994 tank removal activities, approximately 600 <br /> cubic yards of sod from the former UST area and 100 cubic <br /> yards from the dispenser area were removed from the site <br /> Cambria performed a 5-day aquifer pump test during <br /> December 2002 Cambria completed a 5-day SVE test in <br /> October 2003 Cambria completed two five-day GW E events <br /> during September and October 2003 and has scheduled a <br /> third event for December 2003 <br /> 3 2 Area Remediated The areas beneath the former USTs and dispensers <br /> 3 3 Remediation Effectiveness 3 33 lbs of MTBE were removed during the December 2002 <br /> pump test 2 68 lbs of TPHg and 1 42 lbs of MTBE were <br /> removed during the October 2003 SVE test Additional SVE <br /> is not recommended as there is not significant impact to soil <br /> in the source area <br /> $ Si1ft <br /> 4 1 Designated Beneficial Water Existing and potential beneficial uses include municipal and <br /> Use domestic water supply, agricultural supply, industrial service <br /> supply, and industrial process supply(RWQCB Water Quality <br /> Control Plan) <br /> 4 2 Shallow Groundwater Use A well survey conducted by Cambria in 1999 did not identify <br /> wells screened in shallow groundwater within a half-mile <br /> radius of the site <br /> 4 3 Deep Groundwater Use A well survey conducted by Cambria in 1999 identified one <br /> domestic well within a half-mile radius of the site, which is <br /> screened from 150 to 310 fbg <br /> 0955 Page 2 of 4 Date Modified 12/5/2003 <br />