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. SITE CONCEPTUAL MODEL Former Shell Service Station/Econogas Station 880 Victor Road, Lodi, California 2 8 Groundwater Flow Direction, Groundwater flow direction varies at the site However, the Depth Trends and Gradient gradient is consistently small - it averages 0 0019 feet/feet Trends from November 1999 to November 2001 Because the gradient is so small, it is not unusual for the flow direction to vary Depth to water ranges from 46 7 to 50 4 feet below grade (fbg) 2 9 Stratigraphy and Hydrogeology The site is underlain primarily by alternating layers of silts and sands or silty sands to the total explored depth of 100 fbg The first-encountered groundwater zone is unconfined 2 10 Preferential Pathways Analysis No analysis has been performed However, due to groundwater depth (at least 46 7 fbg), it is highly unlikely that any utility trenches would act as a preferential pathway for impacted water 2 11 Other Pertinent Issues Shell ceased operations at the site during December 1998 and sold the station and property to the current owner during March 2001 3 Remediation Status 31 Remedial Actions Taken During the 1994 tank removal activities, approximately 600 cubic yards of soil from the former UST area and 100 cubic yards from the dispenser area were removed from the site 3 2 Area Remediated The areas beneath the former USTs and dispensers 3 3 Remediation Effectiveness Unknown 4 Well and Sensitive Receptor Surve 4 1 Designated Beneficial Water Existing and potential beneficial uses include municipal and Use domestic water supply, agricultural supply, industrial service supply, and industrial process supply (RWQCB Water Quality Control Plan) 4 2 Shallow Groundwater Use A well survey conducted by Cambria in 1999 did not identify wells screened in shallow groundwater within a half-mile radius of the site T-3 Deep Groundwater Use A well survey conducted by Cambria in 1999 identified one domestic well within a half-mile radius of the site, which is screened from 150 to 310 fbg 4 4 Well Survey Results A well survey conducted by Cambria in 1999 identified one domestic well located slightly less than 1/2 mile southwest of the site The well was installed in 1988 and is screened from 150 to 310 fbg and sealed from the surface to 50 fbg Noother wells were identified within a half-mile radius of the site 4 5 Likelihood of Impact to Wells Impact due to site activities is unlikely due to the distance of the domestic well from the subject site 0955 Page 2 of 3 Date Modified 4/18/02