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I 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 referenced site. In letter correspondence dated June 8,2006,the Sari Joaquin County Environmental Health Department(SJCEHD)requested a work plan to assess the lateral and vertical extent of contamination near well MW-6,assess the vertical extent of impacted groundwater in the vicinity of the former underground storage tanks(USTs),and assess the lateral extent of MTBE-impacted groundwater west of the site. 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. i 2.0 SITE BACKGROUND 2.1 Site Description The site is located at 1022 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 (ft amsl) 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 that contains several diesel truck repair shops. 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 Regional Geology and Hydrogeology The site is located within the San Joaquin Valley Groundwater Basin(Basin No.5-22). The Modesto, Riverbank, and Turlock Formations, as well as Recent Alluvium are the primary sources of groundwater production within the San Joaquin Valley Groundwater Basin.