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li , • • <br /> • 15 January 1998 <br /> AGE-NC Protect No 96-0254 <br /> Page 6 of 16 <br /> 3.0. SCOPE OF WORK <br /> Based on the results of the previous assessment investigations,the petroleum hydrocarbon impact <br /> to soil has not been assessed to a vertical depth beyond which ten feet of petroleum-free soil is <br /> distributed Therefore, additional assessment activities are proposed for the former location of the <br /> three fuel USTs Soil borings will be required in the former UST area <br /> Additionally, the vertical and lateral extent of benzene impacted ground water has not been assessed <br /> to levels below the State of California Department of Health Services maximum contaminant level <br /> (MCL) in ground water at the site To determine the vertical extent of dissolved hydrocarbons in the <br /> former UST area, a dual-completed well should be installed down-gradient of the most down- <br /> gradient detection of hydrocarbons in ground water at the site (boring B9) and an additional depth <br /> discrete well should be installed in the former UST area at a depth below documented contaminated <br /> soil, to allow for a vertical assessment of the hydrocarbon impacta*to ground water (UST area) <br /> The proposed investigation of the vertical and lateral extent of petroleum hydrocarbon-impact at the <br /> site will consist of the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil sample collection and analysis, <br /> • Ground water sample collection and analysis, <br /> • Monitoring well installation and sampling, <br /> • Report preparation <br /> 3 1 PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable permits for the investigation on and near the site will be obtained from the PHS-EHD <br /> As required by PHS-EHD permitting, a health and safety plan has been prepared in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National <br /> Institute for Occupational Safety and Health Administration, U S Coast Guard and U S <br /> Environmental Protection Agency, 1985) Prior to mobilization, each soil probe/boring location will <br /> be clearly marked and an utility clearance obtained through Underground Service Alert <br /> Advanced GeoEnviron mental, Inc <br />