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June 10, 1998 Page 2 ) concentration of benzene (48 mg/kg) was detected in sample PD-2 at 2 bgs. The maximum concentration of MtBE (3.9 mg/kg) confirmed by EPA Method 8260 was detected in sample PD-2 at 5-1/2 feet bgs. Proposed Scope of Work The scope of work proposed for this investigation ll include three phases; 1) Well Survey, 2) Geoprobeg Soil and Groundwater Investigation, and 3) Groundwater Monitoring Well Installation. As required by the Occupational Health and,Safety Administration (OSHA) Standard ' "Hazardous Waste Operations and Emergency.Re pone" guidelines (29 CFR 1910.120),.and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), PEG will prepare a Site-Sp cific Health and Safety Pian prior to the commencement of fieldwork. The Site-Specific Health.and Safety Plan will be reviewed by the field staff and contractors before beginning field operations at the site. The specific scope of work to be accomplished is discussed below: PHASE ONE: Well Survey A Well Survey,will be performed to determine loczJ groundwater usage in the vicinity of the site. The survey will include a search of well records at the Department of Water Resources (DWR) in Sacramento to determine theexistence of nearby water supply I wells, and local groundwater use. All wells within a one-half mile radius of the site currently on file at D WR will be documented. PHASE TWO: Geoprobe®Installation Ten Geoprobes® will be located onsite to the nortf., south, east, and west of the product islands to delineate the vertical and horizontal exte t of petroleum hydrocarbon contamination (Figure 2). All Geoprobes®will be driven to a total depth of approximately 20 feet bgs. Five Geoprobes®will ollect samples at 5 foot intervals and the remaining five will continuous core sample to tie total depth. The purpose of the continuous core is to define the stratigraphy beneat ithe site. Sampling will continue until groundwater(anticipated to be approximately 20 feet bgs) or refusal is encountered whichever occurs first. • Soil Selection and Analysis: Selected soil s ples will be submitted to a California State-certified laboratory and analyzed for the presence of TPH-g, BTEX, and MtBE. Selected samples will also analyzed for physical/geotechnical parameters, including fractional organic carbon content, determination of porosity, fluid saturation (moisture content), bulk density, and grain de ity. • Groundwater Analysis. After groundwater is encountered, water samples will be collected from the boreholes and submitted to a California State-certified laboratory 91-1-007.1 S/W RKPLN