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CHRONOLOGY <br /> 4555 N. PERSHING <br /> SITE CODE: 1953 <br /> APN: 110-170-01-6 <br /> 1.1/01/89 UST (12000 GAL TANK #2) failed precision <br /> test . <br /> 07/31/91 Subsurface investigation performed by TMC <br /> evidenced petroleum hydrocarbon in soil. <br /> 11/18/91 EHD received closure plan for removal of 3 <br /> USTs . <br /> 01/08/92 3; USTs removed under EHD permit and <br /> inspection, soil samples collected. UAR and <br /> Prop. 65 filed by EHD. <br /> i <br /> 11/05/92 McLaren/Hart installed 5 MWs under permit <br /> and inspection by EHD. Low concentrations of <br /> gasoline found in groundwater. <br /> I <br /> 06/15/93 360 cubic yards of contaminated soil � <br /> excavated and disposed of off site at Forward <br /> Landfill . <br /> 10/18/93 McLaren/Hart (M.H. ) performed 8 soil borings <br /> and installed one vapor extraction well . <br /> 10/26/93 A vapor extraction test was performed by M.H. <br /> 02/14/95 An on and off site soil and groundwater <br /> investigation/survey was conducted by <br /> Kennedy/Jenks (K.J. ) under EHD permit and <br /> inspection. <br /> 05/01/95 K.J. prepared a report which summarized the <br /> sampling conducted. Soil and groundwater, <br /> both on and off site, contain gasoline <br /> contaminants . Higher concentrations were <br /> confirmed on site with low levels found off <br /> site. <br /> 10/10/97 Clearwater Group, Inc . prepared a request for � <br /> site closure . In the report, it is estimated <br /> 11 gallons of gasoline resides in soil on <br /> site. Gasoline concentrations in groundwater <br /> have continued to decrease over time; only MW <br /> 3 and MW 4 currently contain low level <br /> petroleum hydrocarbon. <br /> 11/12/97 EHD completed a Case Closure Summary and <br /> referred the site to the CVRWQCB for closure <br /> concurrence. <br /> 3" <br />