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SEATTLE <br /> TACOMA <br /> PORTLAND <br /> STOCKTON I �? <br /> RENO , TIME OIL Co . <br /> RICHMON❑ � <br /> WIC ANGELES `} 4 <br /> 1 <br /> ``— 2737 WEST COMMODORE WAY SEATTLE WA 98199 1233 <br /> F.00OCrs P 0 BOX 24447 SEATTLE WA 98124 0447 <br /> TIME TFSTEp 't Jt ek,?42, 9,9� <br /> Mr Michael Collins <br /> San Joaquin County Public Health Services <br /> Environmental Health Division iuJ <br /> P 0 Box 2009 <br /> Stockton, California 95201 �4 , <br /> RE Additional Site Assessment <br /> Jackpot Food Mart, 14000 E Hwy 88, Lockeford, CA (Property No 04-049) <br /> Dear Mr Collins, <br /> This letter has been prepared to provide you with information pertaining to an <br /> environmental investigation completed in December 1993 at the Jackpot convenience <br /> store and retail gasoline facility located at 14000 E Highway 88, Lockeford, <br /> California Please find enclosed copy of Science and Engineering Analysis <br /> Corporation's (SEACOR) "Environmental Site Assessment Report" dated June 14, <br /> 1994, which documents site activities and contains analytical reports <br /> For your convenience, Attachment 2 contains a summary of environmental activities <br /> conducted at the subject site from September 1991 to the present date <br /> Additional Soil and Groundwater Investigation <br /> Based on analytical results obtained during the tank removal and the 1992 site <br /> assessment, an additional investigation was initiated in December 1993 to <br /> determine the extent of impacted soils at the subject site Prior to the <br /> implementation of field activities, SEACOR's workplan was submitted for your <br /> review Authorization to proceed with the proposed field activities was received <br /> on November 26, 1993 <br /> Because data collected during earlier field investigations indicated that the <br /> extent of hydrocarbon-impacted soils had only been defined to the west at the <br /> site, additional borings were needed to the north, south, and east of the former <br /> tank bed Accordingly, on December 2 and 3, 1994, a mobile drill rig was <br /> utilized to advance three soil borings and install two vapor extraction wells in <br /> the vicinity of the former tank system <br /> During field activities, soils were found to consist of fine silty sands , sandy <br /> silts, or clayey silts to approximately 15 feet below ground surface, this strata <br /> was underlain by fine to coarse sands to a depth of approximately 30 feet <br /> Clayey silt was generally encountered at 30 feet to 35 feet, while fine to coarse <br /> sands were encountered from 35 feet to the extent of the borings Groundwater <br /> was not encountered during field activities Drilling locations are included on <br /> Figure 2 of SEACOR's report and boring logs are included as Appendix A <br /> Borings SB-6 and SB-7 were advanced to a depth of 41 5 feet below ground surface . <br /> while SB-9 was advanced to 56 5 feet Wells W-7 and W-8 were installed to a <br />