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20 May 1999 <br /> AGE-NC Project No. 99-0604 <br /> Page 2 of 5 <br /> hydrocarbons quantified as gasoline (TPH-g), volatile aromatics (benzene, toluene, ethyl benzene <br /> and xylenes: BTEX),total lead and ethylene di-bromide(EDB).BTEX were detected in soil samples <br /> collected beneath the USTs at concentrations up to 102.4 parts per million(ppb). <br /> 2.3. GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based upon the San Joaquin County Flood Control Map Lines of Equal Depth in Water Wells - <br /> 1996, ground water depth in the area of the site is approximately 40 to 50 feet below surface grade. <br /> Regional ground water flow direction is east-northeast; however, flow direction can vary seasonally <br /> throughout San Joaquin County. <br /> 3.0. SCOPE OF WORK <br /> The scope of work will initially include the advancement of one soil probe boring to a depth of 30 <br /> feet below surface grade(bsg). However, if field observations indicate that hydrocarbons are present <br /> at the site, the probe boring may be advanced to greater depth or additional probe borings may be <br /> advanced. Soil samples will be collected from the probe boring; grab ground water samples will be <br /> collected from selected borings. Assessment activities will include the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Ground water sample collection and analysis, if encountered; <br /> • Report preparation. <br /> 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the PHS-EHD. As required by PHS-EHD <br /> permitting, a health and safety plan will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> 1985). Prior to mobilization, each soil probe location will be clearly marked and an utility clearance <br /> obtained through Underground Service Alert. <br /> Advanced GeoEnvironmental,Inc. <br />