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1 ,4, <br /> SECOR <br /> Dttc national Incoiporated <br /> November 3 , 1998 <br /> Project 76007-044-01 ENVIRONMENTAL HEALTH DIVISION <br /> 304 E . Weber Ave. Third Floor <br /> Mr. Brett Hunter P. O. Box 388, Stockton CA 95201 -0388 <br /> Chevron Products Company DeP ed y <br /> P. O. Box 6004 Conditions O �wv G o � '(h.�� <br /> San Ramon, California 94583-0904 r Aw. <br /> Date <br /> Re: Work Plan for Site Assessment <br /> Former Chevron Service Station 9-8632 <br /> 575 Grant Line Road ,^ . ; <br /> Tracy, California <br /> Dear Mr. Hunter: T <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Chevron Products Company (Chevron), presents a work plan for further site assessment <br /> at the subject site (Figures I and 2). The purpose of the proposed work is to further <br /> define the extent of petroleum hydrocarbons in soil and groundwater. The proposed work <br /> will include the drilling and installation of one offsite groundwater monitoring well <br /> northwest (downgradient) of the former gasoline underground storage tanks (USTs) and <br /> product islands. <br /> _ This work plan includes a brief discussion of site background and previous investigations, <br /> proposed scope of work, and schedule. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> In 1984, the steel USTs and product lines (installed in 1964) were removed. Three <br /> 10,000-gallon capacity gasoline USTs, and one 1 ,000-gallon capacity waste oil UST, all <br /> of single-wall fiberglass construction, were installed. <br /> In May 1994, the USTs, product lines, hoists, sand/grease trap, and approximately 400 <br /> cubic yards of impacted soil generated during excavation were removed from the site. As <br /> approved by San Joaquin County Public Health Services (SJCPHS), slightly impacted soil <br /> was aerated to nondetectable levels and re-used onsite. Groundwater was encountered <br /> during excavation activities at approximately 8 feet below ground surface (bgs) <br /> (Touchstone, June 1994) . <br /> In August 1994, the waste-oil UST and sump excavations were over-excavated until soil <br /> exhibiting low to nondetectable levels of oil and grease were encountered. <br /> Approximately 150 to 200 cubic yards of oil and grease impacted soil was removed and <br /> hauled offsite (Touchstone, May 1995) . <br /> i <br /> i <br /> l 9912 Btisiwu v Park Drlve. Suite 100_ Sacrawewo, CA 95827 19 /61 361- }880 (916 ) 304-1889 FAV tnnrSecnr.corfl <br /> 1 <br />