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December 8, 1997 . <br />Page 3 <br />sections, 5) a search of onsite underground utilities and offsite water wells within 1/2 - <br />mile (if not previously conducted); and 6) preparation of a report summarizing the <br />above information. Groundwater is expected to be encountered between 19-1/2 and 26 <br />feet bgs. <br />As required by the Occupational Health and Safety Administration (OSHA) Standard <br />"Hazardous Waste Operations and Emergency Response" guidelines (29 CFR <br />1910.120), and by California Occupational Health and Safety Administration <br />(Cal -OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR <br />Title 8, Section 5192), PACIFIC has prepared a Site -Specific Health and Safety Plan <br />(Attachment B). The Site -Specific Health and Safety Plan will be reviewed by the field <br />staff and contractors before beginning field operations at the site. <br />The specific scope of work is discussed below: <br />• Records Review. PACIFIC will conduct a review of San Joaquin <br />County records concerning past activities and environmental <br />investigation at the subject site and sites in the surrounding area. <br />Chevron files will also be reviewed for the subject site. Aerial <br />photographs of the area to document past land usage will also be <br />reviewed. <br />Soil Boring Locations. Two soil borings will be driven onsite to <br />depths of approximately 90 feet bgs. These will be installed to <br />evaluate the vertical extent of gasoline hydrocarbons and MtBE in <br />the soil and groundwater. One soil boring will be installed near the <br />UST complex and the other will be installed east of the product <br />island between the northern product island and the kiosk. Locations <br />of the proposed borings are shown in Figure 2. Depth discrete soil <br />and groundwater samples will be collected from each borings. <br />Continuous core sampling will be performed in the boring nearest the <br />USTs. The second boring will be sampled at 5 -foot depth intervals <br />from the surface to the bottom of the boring. Groundwater "grab" <br />samples will be obtained from various depths within the two borings <br />utilizing the procedures outlined in Attachment A. <br />Soil and Groundwater Selection and Analysis. Selected soil samples <br />will be submitted for analysis at a California State -certified laboratory. <br />Soil and groundwater samples will be analyzed for the presence of <br />TPH-g, BTEX compounds, methyl tertiary butyl ether (MtBE), tertiary <br />butanol, DIPE, ETBE, TAME, 1,2 -DCA, and naphthalene. <br />Stratigraphic Information. Stratigraphic information will be collected <br />during the installation of borings at the site and will be logged by a <br />PACIFIC geologist. Two geologic cross sections will be prepared <br />(crossgradient and parallel to gradient). <br />920-124 IA/WKPLAN <br />