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' 1 <br /> CHRONOLOGY <br /> 104 W. ELEVENTH STREET 'TRACY <br /> SITE CODE: 20842 <br /> APN: <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 for remediation and <br /> assessment oversight . <br /> 01/17/90 Approximately 100- cubic yd. of contaminated <br /> soil was removed off 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 (<i000PPM) <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 saihpling. : <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 /> CHRON104 <br /> i <br />