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17 � • <br /> 26 September 2000 <br /> AGE-NC Project No 96-0263 <br /> Page 3 of 10 <br /> MW8 at concentrations as high as 3 0 mg/kg(MW2-5) by EPA Method 8020 MTBE was detected <br /> by EPA Method 8260 Modified at concentrations as high as 3,000 micrograms per kilogram(,ug/kg) <br /> in the same samples No other oxygenates were detected in the soil sample analysis Analytical <br /> results of soil samples are summarized on Table 6 <br /> 2 3 REGIONAL GROUND WATER ELEVATION <br /> Information obtained from monitoring wells located at the site in August 2000 indicate that <br /> groundwater depth at the site is between 6 and 8 feet bsg Ground water flow direction at the site is <br /> toward the north, consistent with flow direction in the Tracy area <br /> 3.0. SCOPE OF WORK <br /> Based on analytical data from the previous site assessments of the site, the PHS-EHD has requested <br /> that an additional soil and ground water Investigation be performed to define the lateral and vertical <br /> extent of the petroleum hydrocarbon contamination A significant hydrocarbon-impact to soil and <br /> ground water has been encountered in the area of the former dispenser island <br /> The proposed scope of work will include the following tasks <br /> • Permitting and pre-field work activities, <br /> • CPT soil boring advancement, <br /> • Soil sample collection and analysis, <br /> • Monitoring well installation and sampling, and <br /> • Report preparation <br /> Each of these tasks Is described In greater detail below <br /> 3 1 PRE-FIELD WORK ACTIVITIES <br /> A health and safety plan will be updated In accordance with Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety <br /> and Health Administration, U S Coast Guard and U S Environmental Protection Agency, 1985) <br /> . Prior to mobilization, the area of excavation will be clearly marked and an utility clearance obtained <br /> through Underground Service Alert <br /> Advanced GeoEnvironmental,Inc <br />