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I 1 C A M B R I A WORK PLAN FOR ADDITIONAL SITE ASSESSMENT JIMCO TRUCK PLAZA 1022 FRONTAGE ROAD RIPON,CALIFORNIA 1.0 INTRODUCTION On behalf of Olympian JV (Olympian), Cambria Environmental Technology, Inc. (Cambria) has prepared this Work Plan for Additional Site Assessment at the above-referenced site. In letter correspondence dated February 2,2005,the San Joaquin County Environmental Health Department (SJCEHD)requested a work plan to assess the lateral extent of impacted groundwater west of wells MW-8 and MW-9,and assess the vertical extent of impacted groundwater in the vicinity of the USTs. A copy of the SJCEHD correspondence is included as Appendix A. Presented below is the site background,a summary of previous investigations,an evaluation of the contaminant distribution,and the proposed scope of work and schedule. 2.0 SITE BACKGROUND 2.1 Site Description oz The site is located at 10 Frontage Road(formerly 22502 South Highway 99)in Ripon,California (Figure 1). The site is at an elevation of approximately 58 feet above mean sea level (amsi) with generally flat topography. The site is an operating truck service station with several structural improvements. Along the northern property boundary are several contiguous buildings that facilitate the operation of retail businesses including a convenience store,a restaurant,a coin-operated laundry facility,an office building, and a warehouse. A separate structure near the southern boundary of the site accommodates a truck wash and truck service bay. Other site improvements include ten fuel dispensers,one split 8,000-gallon and 12,000 gallon gasoline underground storage tank(UST),four 30,000-gallon diesel aboveground storage tanks (ASTs), a propane tank, a 4,500-gallon oil water separator, a truck scale, and a drainage pond. A site plan showing the general layout and relative locations of site features is included in Figure 2. 2.2 Historical Site Operations The site has been operated as a truck stop for the past 30 years. On May 28, 1992, a leaking diesel fuel dispenser was identified during a routine annual inspection by an inspector with the San Joaquin County Environmental Health Department. In 1998,three USTs and ten fuel dispenser islands were removed from the site. A new gasoline UST and ten dispensers were installed along with new product piping connecting the new dispensers with the new UST and the existing diesel ASTs.