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• 12 March 1999 <br /> AGE-NC Project No 97-0333 <br /> Page 3 of 6 <br /> based on information from Lines of Equal Depth of Water Wells Spring 1996, published by the San <br /> Joaquin County Flood Control District and Water Conservation District(SJCFCD) Based on review <br /> of a regional ground water elevation map published by the SJCFCD, the prevailing ground water <br /> flow direction in Manteca is generally toward the northwest, although flow directions may be both <br /> locally and seasonably variable <br /> 3.0. SCOPE OF WORK <br /> Based on analytical results of soil samples collected during UST removal activities, further <br /> investigation is needed to delineate vertical and horizontal petroleum hydrocarbon-impact at the site <br /> Assessment activities will consist of the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil/ground water sample collection and analysis, <br /> • Report preparation <br /> 3 1 PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the PHS-EHD In addition, an update to <br /> the health and safety plan presently on-file will be prepared in accordance with Occupational Safety <br /> and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for <br /> Occupational Safety and Health Administration, U S Coast Guard and U S Environmental <br /> Protection Agency, 1985) Prior to mobilization, each probe boring location will be clearly marked <br /> and an utility clearance obtained through Underground Service Alert <br /> 3 2 SOIL/GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Initially. AGE proposes to advance seven probe borings at the site to evaluate the lateral and vertical <br /> e\tent of petroleum hydrocarbon impact Additional probe borings may be required to completely <br /> delineate any impacted soil and/or ground water encountered Proposed soil boring locations are <br /> illustrated in Figure 2 <br /> Based on soil contamination encountered beneath the former USTs, product piping and dispenser <br /> island area, AGE proposes advancement of probe borings in the following locations <br /> • <br /> Advanced Geoi:niron mental Inc <br />