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i <br /> a <br /> CHRONOLOGY <br /> 104 W. ELEVENTH STREET TRACY <br /> SITE CODE: 20842 <br /> APN: 2-- - 053 -b"1 - 1 <br /> 11/16/88 One UST (Waste Oil) removed under permit and <br /> inspection by PHS/EHD. Soil contamination. <br /> evidenced: TPH 4000 PPM, BENZENE 760PPB in <br /> addition to TEX. <br /> 02/10/89 EHD completed a UAR for releases documented <br /> in 1988 . <br /> 12/06/89 EHD placed site in LOP tor!'remediation and <br /> assessment oversight . <br /> 01/17/90 Approximately 100 cubic yd, of contaminated. <br /> soil was removed oft site for disposal . Soil <br /> samples collected revealed low level residual <br /> TPH. <br /> 05/30/90 Six soil boring performed under EHD permit <br /> and inspection. Three on site MWs installed. <br /> 10/30/90 Additional soil removed due to residual oil <br /> and grease with. low BTEX. THP (<1000PPM) <br /> remains on south border of former UST .under <br /> existing building currently in use . . <br /> 03/22/91 One 500 gal . UST. (gasoline) closed in place, <br /> no contamination found in samples collected <br /> 05/30/95 prior to permanent closure . <br /> 03/25/91 EHD received disposal receipt for 10 cubic <br /> yd. of contaminated soil taken to McKitrick. <br /> 08/06/92 EHD requested closure concurrence from <br /> CVRWQCB. <br /> 08/17/93 CVRWQCB responded to R. P. requiring <br /> additional groundwater sampling. <br /> 01/06/95 SWRCB issued LOC for UST remediation cost <br /> reimbursement . <br /> 12/30/96 Groundwater contaminated with chlorinated <br /> petroleum hydrocarbon in on site monitoring <br /> wells continues to remain in low <br /> concentrations. EHD will request site <br /> closure concurrence from CVRWQCB. <br /> 01/04/97 CVRWQCB concurred with EHD' s request for <br /> closure .. <br />