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_ ___ _ _ . .... <br /> � J r 1996 E. BF-AMER STREET <br /> ROUTE 0 2 BOX 177 <br /> _._ WOODLAND,CA 45695-6649 <br /> WESTERN GEO-ENGINEERS FAX (916) 662-0272 <br /> CALIF.CONTRACTOR A 513957 A CORPORATION r�_4541 <br /> 1 <br /> REGISTERED GEOLOGISTS (9 y6 ��) G <br /> SECTION 1.0 <br /> INTRODUCTION <br /> Western Goo-Engineers with Hogate Drilling has installed three ground water <br /> monitoring wells within the property boundaries of the Mobil Service Station located <br /> at 950 11th Street, Tracy, California. The purpose of this investigation was to <br /> assess the site for possible ground water and/or soil contamination. These wells <br /> were installed May 5 and May 6, 1988; under a permit issued by Sark Joaquin County <br /> Health Department. <br /> SECTION 1.1 <br /> LOCATION <br /> Desert Petroleum Service Station #787, a Mobil Station, is located at 950 11th <br /> Street, Tracy, San Joaquin County, California, in Sec. 29; T2S; R5E; MDB&M at <br /> approximately 50 feet above mean sea level, and in Assessor's book 231, parcel , <br /> number 09-02 (see figure 1, 2 & 3). <br /> `'-- SECTION 1.2 <br /> PREVIOUS WORK <br /> Walton Engineering was contracted by Desert Petroleum Inc. to: 1. remove four <br /> underground storage tanks (1 regular gasoline, 1 unleaded gasoline, 1 super <br /> unleaded gasoline and 1 waste oil), from the Mobil station. 2. Install three <br /> underground fuel storage tanks along with new fiber trenching, piping, pump <br /> dispensers, etc. 3. Completely remodel and upgrade the station. Tank removal <br /> and spoiled soil excavation was accomplished April 19, 1988. Upon discovery of <br /> gasoline type odors during the excavation and tank removal the San Joaquin <br /> County Health inspector elected to have Walton Engineering cease construction of <br /> the Desert Petroleum Service Station until further assessment was accomplished. <br /> Sampling of water exposed by the excavation, of the removed soil, and of the <br /> undisturbed soil was performed by Western Goo-Engineers under the supervision of <br /> San Joaquin County Health inspector with A "Chain of Custody" delivery of the <br /> samples to Eureka Laboratories of Sacramento, California for certified laboratory <br /> analysis (See figure 413 Sample Locations, Tables 2 & 3 Eureka Laboratory results, <br /> Appendix J, tank pull sample report and Appendix B Eureka Analysis Reports). <br /> Desert Petroleum contracted Walton Engineering and Western Geo- Engineers to <br /> perform the necessary assessments. <br /> page 1 <br />