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June 5, 1998 <br /> Page 4 <br /> PROPOSED SCOPE OF WOR <br /> jThe scope of work proposed for this investigation will include the installation of three <br /> shallow groundwater monitoring wells and three deep Continuous core soil borings to <br /> attempt delineation of lateral and vertical extent of hydrocarbons in the soil and <br /> groundwater Based on recent groundwater monitoring data from the San Joaquin County <br /> Flood Control District (SJCFCD), groundwater is anticipated to be encountered between <br /> 56 5 and 58 5 feet below ground surface (bgs) SJCFCD files revealed a historical high <br /> groundwater level of 14 5 feet bgs and a historical low groundwater level of 91 5 feet bgs <br /> As required by the Occupational Health and Safety Administration (OSHA) Standard <br /> ' "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120 <br /> and by California Occupational Health and Safety Administration (Cal-OSHA) ), <br /> "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, <br /> Section 5192), PEG will prepare a Site-Specific Health and Safety Plan prior to the <br /> commencement of fieldwork The Site-Specific Health and Safety Plan will be reviewed <br /> by the field staff and contractors before beginning field operations at the site <br /> The specific scope of work is discussed below- <br /> • Monitoring Well Installation Three proposed groundwater <br /> monitoring wells (MW-1 through MW-3) will be installed at the general <br /> locations shown on Figure 2 The wells will be installed to anticipated <br /> depths of 73 feet bgs (15 feet into groundwater) with 20 feet of screen <br /> Screen slot size will be based on geologic conditions observed during <br /> well installation Soil samples will be collected every five vertical feet <br /> in each well boring <br /> • Exploratory Soil Borings. Continuous core samples will be collected <br /> and logged at three conductor casing locations (Figure 2) The <br /> continuous cores will be used to evaluate site Iithologyand to prepare a <br /> strategy for further assessment of groundwater pathways The <br /> exploratory soil cores are also anticipated to aid in further definition of <br /> ' residual contaminants detected at the current extent of vertical <br /> investigation <br /> Soil Sample Selection and Analysis. Selected soil samples will be <br /> submitted to a California State-certified laboratory and analyzed for the <br /> presence of TPH-g, benzene, toluene, ethylbenzene, xylenes (BTEX <br />' compounds), and MtBE In addition, soil samples collected at location <br /> T-4 will be analyzed for semi-volatile organics Soil sampling in <br /> exploratory borings will be conducted at discrete changes in lithology <br /> and/or significant PID readings recorded during field screening <br /> 920-122 IA/FNKPULL DOC <br />