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' Beacon Station No 641 December 8, 1997 <br /> t k n I f mia Ad iti nal Substirface Investlization Re rt <br /> (USA) was notified for locations of underground utilities, and site-specific Health & Safety <br /> Plans were prepared on June 10, 1996 and updated on July 31, 1997 <br /> All activities were completed in compliance with the State of California Water Resources <br /> tControl Board's Leaking Underground Fuel Tanks (LUFT) Manual, the Regional Water <br /> Quality Control Board (RWQCB) Tri-Regional Board Staff Recommendations for <br />' Preliminary Investigation and Evaluation of Underground Tank Sites, and SJC PHS/EHD <br /> guidelines All field work followed the Horizon Environmental Inc Field Methods and <br /> Procedures (Appendix B) <br /> Drilling-and Soil Sampling- Phase I <br />' On July 22, 1996, the first phase of field work was conducted in the area east of the <br /> replacement USTs, prior to the installation of a new canopy A Horizon geologist observed <br /> the drilling of two soil borings B-1 and B-2 The borings were each drilled through 10 feet <br /> of pre-installed, 18-inch diameter, polyvinyl chloride (PVC) conductor casings to evaluate <br /> the presence of gasoline-range hydrocarbons to the soil and groundwater beneath the site <br /> Each conductor casing location had a previously installed water-tight, 24-inch diameter, <br /> traffic-rated, steel well box The traffic boxes were each sealed to the conductor casing with <br /> a concrete apron set approximately '/z-inch above the surrounding grade The borings were <br />' drilled and sampled using a truck-mounted dulling rig equipped with 10-inch diameter <br /> hollow-stem augers All Phase 1 drilling, sampling and well completion activities were <br /> performed by Mitchell Drilling Environmental Corporation (Mitchell), a C-57 licensed <br /> drilling contractor from Rancho Cordova, California <br /> During drilling, soil samples were collected from each boring at five-foot intervals from the <br /> bottom of the conductor casing to the total depth of the boring Soil samples and cuttings <br /> were evaluated for the presence of petroleum hydrocarbon vapors with a portable organic <br /> vapor meter (OVM) Any evidence of petroleum hydrocarbons was recorded on the soil <br /> boring logs which contain soil descriptions and well completion data (Appendix C) Soil <br /> samples were contained in chilled storage for transport to the laboratory for the requested <br />' <br /> 1641-13 rpt 3 HORIZON ENVIRONMENTAL INC <br />