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CLOSURE CHRONOLOGY FOR 34100 S KOSTER RD,NEW <br /> r JERUSULEM SCHOOL, TRACY CA <br /> Carol Oz, May 13,`1999 <br /> f � <br /> j June 6, 1989 Two USTs removed under PHS/EHD permit (Tank#1-1,000gal diesel <br /> and#2-350 gal. diesel/gasoline). Odor and discoloration observed in <br /> soil below tank 92. <br /> July 20, 1989 Soil sample results evidence TPHd and BTEX contamination. <br /> Aug. 9, 1989 Prop 65 and UAR completed. <br /> Feb. 1, 1994 Site entered on contaminated site list <br /> Sept. 10, 1996 Site entered LOP. NOR sent on 9/18/96. <br /> Nov. 18, 1996 Preliminary investigation. Three borings constructed to 10 feet. <br /> Nov. 22, 1996 Soil and water samples evidenced TPHg and BTEX. <br /> Aug. 17, 1998 PHS/EHD sent letter requiring an investigative work plan. <br /> Nov. 19, 1998 Approved work plan for borings and ';MW installation. <br /> Dec. 21, 1998 Observed installation of 3 MWs on site. <br /> April 19, 1999 Report of findings for borings and MW sampling evidence Non <br /> detectable concentrations of TPHg and BTEX. Two consecutive <br /> j quarterly monitoring events at site evidence ND results. <br /> August 26, 1999 Migration Potential Modeling Report and Monitor Well Closure <br /> Plan received. Migration potential of contaminant plume reported <br /> as minimal, 0.3 ft/yr. - <br /> f <br /> 1 <br /> i <br /> 1 . <br /> i <br /> 1 <br />