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Mr Jeffrey Wong <br /> C A M B R I A February 23, 2006 <br /> Item Evaluation Criteria Comments/Discussion <br /> depth of 100 fbg The first-encountered groundwater <br /> 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 <br /> unlikely that any utility trench would act as a <br /> preferential pathway for impacted water <br /> 211 Other Pertinent Issues Shell ceased operations at the site during <br /> December 1998 and sold the station and property to <br /> the current owner during March 2001, who currently <br /> operates an Econo Gas station on site <br /> 3 Remediation Status <br /> 3 1 Remedial Actions Taken During the 1994 tank removal activities, <br /> approximately 600 cubic yards of soil from the <br /> former UST area and 100 cubic yards from the <br /> dispenser area were removed from the site Shell <br /> performed one 5-day aquifer pump test during <br /> December 2002, one 5-day SVE test in <br /> October 2003, and three 5-day GWE events during <br /> September, October, and December 2003 <br /> Shell installed a temporary GWE system and has <br /> operated it since September 29, 2005 <br /> 3 2 Area Remediated The areas beneath the former USTs and dispensers <br /> were remediated by over-excavation Subsequent <br /> GWE and SVE have targeted the gasoline USTs <br /> Initially, the temporary GWE system pumped <br /> groundwater from wells MW-2 and MW-4 (both near <br /> the gasoline USTs) Currently the system is pumping <br /> water from MW-4 only <br /> 3 3 Remediation Effectiveness 3 33 pounds (lbs) of MTBE were removed during the <br /> December 2002 pump test 2 68 lbs of TPHg and <br /> 142 lbs of MTBE were removed during the October <br /> 2003 SVE test During the three GWE events in <br /> 2003, approximately 8 04 lbs of MTBE were <br /> removed Since its start up, the temporary GWE <br /> system has removed approximately 2 4 lbs of MTBE <br /> and 7 1 lbs of TBA (through December 31, 2005) <br /> 4 Well and Sensitive Receptor <br /> Survey <br /> 4 1 Designated Beneficial Water Use Existing and potential beneficial uses include <br /> municipal and domestic water supply, agricultural <br /> supply, industrial service supply, and industrial <br /> process supply (RWQCB Water Quality Control <br /> Plan) <br /> 4 2 Well Survey Results A well survey conducted by Cambria in 1999 <br /> identified one domestic well located slightly less than <br /> 11 <br />