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CHRONOLOGY <br /> 13975 E HWY 88 LOCKEFORD <br /> SITE CODE: 1622 <br /> APN: 019-080-14 <br /> 06/01/87 Pre Tank Removal. Assessment performed by <br /> Applied Geosystems . Four monitoring wells <br /> were installed on site . All four Ws <br /> contained gasoline hydrocabon in groudwater. <br /> 01/11/88 EHD completed and filed a UAR for <br /> contamination discovered during 1987 <br /> assessment . <br /> 03/21/94 Four USTs (gasoline) were removed under EHD <br /> permit and inspection. Soil samples beneath <br /> the USTs contained low gasoline <br /> concentrations and 800 cubic yards of soil <br /> was removed for aeration and relocation. New <br /> dual wall UST systems were installed in <br /> former UST excavation. <br /> 09/12/90 Site placed in the LOP for further assessment including <br /> a groundwater investigation. <br /> 01/11/94 Four soil boring were drilled by Geological <br /> Audit Services and 2 MWs were installed. <br /> 04/10/95 Two additional soil boring were completed near MW-2 the <br /> only well with current groundwater contamination. Soil <br /> was impacted from 35 to 40 feet BGS only; contamination <br /> was limited. <br /> 05/26/98 Groundwater gasoline concentrations have continued to <br /> decrease. All 6 MWs were sampled this date; all are <br /> currently below detection limits for gasoline, STEX, <br /> and oxygenates . <br /> 07/01/98 EHD reviewed Closure Report prepared by AGE requesting <br /> no further action. Case Closure Summary completed and <br /> site referred to CVRWQCB for closure concurrence. <br /> chron139wp <br />