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• Well Installation and Site Investigation Report <br /> ARCO Facility No.5469 <br /> Stockton,California <br /> Page 3 <br /> MW-10). Delta submitted a Well Installation Report (dated August 15, 2001) <br /> documenting the well installation activities. The newly installed wells were incorporated <br /> into the quarterly groundwater monitoring program. <br /> SCOPE OF WORK <br /> The primary objectives of the fieldwork were to: <br /> o Install wells necessary to initiate ozone injection. <br /> o Evaluate the vertical extent of petroleum hydrocarbon impact to soil and <br /> groundwater. <br /> o Further characterize subsurface stratigraphic relations. <br /> The scope of work implemented during the investigation consisted of <br /> - <br /> 0 Drilling and installing five (5) ozone injection wells (IW-1 through IW-5) to <br /> depths ranging between approximately 53.5 and 63 feet bgs. <br /> o Collecting soil samples from borings IW-1 through IW-5 for lithologic evaluation. <br /> o Advancing one CPT boring (CPT-1) to a depth of approximately 120 feet bgs. <br /> 0 Collecting soil and grab groundwater samples from separate borings located <br /> immediately adjacent to boring CPT-1. <br /> FIELD ACTIVITIES <br /> Prior to implementation of field activities, permits to advance the soil borings and <br /> construct the monitoring wells were obtained from San Joaquin County PHS/EHD. <br /> Underground Service Alert and San Joaquin County PHS/EHD were notified 48 hours <br /> prior to beginning work activities. Standard field practices and procedures are presented <br /> in Appendix A. All work was conducted under the direct supervision of a state of <br /> California registered geologist. Copies of the drilling permits are included in <br /> Appendix B. <br /> Soil 1Boirings <br /> A Stratus geologist observed Woodward Drilling Company of Rio Vista, California <br /> (C57# 710079) advance five soil borings (IW-1 through IW-5) between March 25 and 26, <br /> 2002. The soil borings were advanced using a truck mounted drill rig equipped with <br /> 8-inch diameter hollow stem augers. The borings were continuously sampled beginning <br /> at depths ranging between 40 and 45 feet bgs to the total depth of the borehole. Given the <br /> proximity of previous borings completed in the area, the well borings were not logged <br /> between surface grade and the start of continuous sampling. Soils were classified onsite <br /> PABp-Arca for URS154691Reports15469report2003.doc <br />