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EAGEO <br /> GEOTECEMCAL AND ENVIRONMENTAL CONSULTANTS <br /> I N C O R P O R A T E D MATERIALS TESTING <br /> Proj ect No. <br /> 0001.5.052.90 <br /> May 5, 2004 <br /> Mr. Wes Johnson Rl <br /> c/o San Joaquin County MAY 0 6 2004 <br /> Department of Public Works ;.;�\iinu�1MENT HEALTH <br /> 1810 East Hazelton Avenue PERMIT/SERVICES <br /> Stockton, California <br /> Subject: Lower Sacramento Road—Harney Curve <br /> Lodi, California <br /> WORK PLAN FOR PHASE TWO CONSULTING SERVICES <br /> Dear Mr. Johnson: <br /> ENGEO Incorporated is pleased to present this work plan for consulting services in connection <br /> with the Lower Sacramento Road — Harney Curve project. Based on our conversations and the <br /> documents provided us, we prepared this work plan to provide a Phase Two site characterization <br /> of the underground tank sites that have been determined by San Joaquin County and the Central <br /> Valley Regional Water Quality Control Board to require No Further Action. <br /> BACKGROUND <br /> We understand that San Joaquin County desires to acquire two properties (Alberg Property and <br /> Yuen Property) for the Lower Sacramento Road — Harney Curve project. The Alberg Property <br /> encompasses approximately 1-acre that contains a former gasoline station, a truck repair facility, <br /> and mobile homes. The Yuen Property includes approximately 4-acres that are currently being <br /> used for agricultural production. <br /> Four underground hydrocarbon storage tanks (USTs) were associated with the gasoline station <br /> building within the Alberg Property that is currently operated as a Pub. Three of the USTs were <br /> removed in 1988. The fourth tank is reported to have been used as a waste oil storage tank that <br /> was abandoned in place by filling with concrete in 1990. The tank closure records indicate that <br /> petroleum product as gasoline and benzene, toluene, ethylbenzene, and total xylenes were <br /> detected in soil samples collected from one of the three 1988 UST excavations. Following this <br /> detection, approximately 200 cubic yards of soil was excavated. Sampling conducted after <br /> excavating the 200 cubic yards of soil is reported to have shown that approximately 65 cubic <br /> yards of soil containing hydrocarbons was allowed to remain in the ground. We found no <br /> records of soil sampling having been conducted at the UST that was closed in place in 1990. <br /> 2880 North Tracy Boulevard•Suite 3•Tracy,CA 95376•(209)835-0610•Fax(209)835-0675 <br /> E-mail:engstaff@engeo.com•www.engeo.com <br />