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NO, <br /> U11 <br /> CLOSURE CHRONOLOGY FOR DELTA SIGNS & <br /> j CRANE SERVICE AT 2100 SANGUINETTI, <br /> STOCKTON, CA <br /> Ik August 14, 1997 One steel Underground Storage Tank (UGT) removed under <br /> permit and inspection of San Joaquin County Public Health Services Environmental <br /> Health division (PHS/EHD). Odor and discoloration observed in soil below UGT. <br /> August 22, 1997 Soil sample results evidence contamination ( T,E,X and MTBE) <br /> If August 27,'1.997 Prop 65 and UAR completed. <br /> February 5, 1998 NOR sent to responsible party, site was placed in LOP. <br />` September 1, 1998 Reviewed and approved Work Plan to investigate contamination at <br /> site. <br /> October 19, 1998 PHS/EHD observed 2 investigative borings in the area of <br /> previously removed UGT. PID highest reading was 106 ppb. <br /> October 20,1998 PHS/EHD observed boring no. 3 to 55 feet. <br /> February 11, 1999 All soil sample results were non detect for petroleum <br /> contamination. <br /> February 16, 1999 Began closure summary preparation. <br /> Prepared by Carol Oz, February 16, 1999 <br /> K <br />