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• SECOR wwwsecorcom NTERNATIONAL 3017 Kilgore Road,Suite 100 S E C O R INCORPORATED Rancho Cordova,CA 95670 916-861-0400 TEL 916-861-0430 FAX October 26, 2004 Ms. Margaret Lagorio San Joaquin County Public Health Services 304 East Weber Ave 3rd Floor Stockton, CA 95201-0388 Re: Due Diligence Site Assessment Work Plan ConocoPhillips Station 255417 1700 East Yosemite Avenue (State Highway 120) Manteca, CA Dear Ms. Lagorio: This letter, prepared by SECOR International Incorporated (SECOR), presents a work plan for due diligence site assessment at the site reference above (Figures 1). SECOR proposes to advance six direct push soil borings adjacent to the existing underground storage tanks (USTs) and product dispensers. This scope of work has been prepared at the request of ConocoPhillips and the purpose f of the proposed work is to generate a baseline assessment of the site at the time of property transfer. PROPOSED SCOPE OF WORK The scope of work for this due diligence site assessment will include the drilling of six direct push soil borings in the area of the existing LISTS and dispensers at the locations shown on Figure 1. The specific scope of work is discussed below: • Site Safety Plan. As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), a Health and Safety Plan (HASP) will be prepared. The HASP will be reviewed by the field staff and contractors before beginning field operations at the site. • Permitting. Soil boring permits will be obtained from the San Joaquin County Environmental Health Department prior to initiating work. • USA and Notification. Prior to drilling, SECOR will mark the location of the soil borings and use a private utility locator to clear the location. Underground Service Alert (USA) will be called to allow the local underground utility companies to identify the location of any utilities in the area of the proposed work. All borings will be cleared to a minimum depth of 5 feet below ground surface (bgs). • Soil Borings. Six direct push soil borings will be drilled at the locations shown on Figure 1. Soil borings will be drilled using a direct push drilling rig. Each boring will be advanced to a maximum depth of 50 feet bgs. Depth to groundwater at the site is anticipated to be between 13 and 15 feet bgs. Each boring will be advanced to groundwater and a groundwater sample will be collected with a hydropunch.