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1 <br /> PRIOR USE OF REMOVED LIST' S <br /> The site had been the location of a gasoline station for mthly <br /> years; the removed tanks had been used ..Cor d15pCIit .iug-' kaaoiine <br /> and storing waste oil The property is presently being used as <br /> an automotive tune--up & repair faciliLy , idle pumps & <br /> associated piping were removed along with the uaakb . There are <br /> no records available concerning the dates Laidl, the e.ankki were <br /> installed <br /> SUMMARY OF PRIOR WORK D{)NE: <br /> On December 5 , 1986, Western Meter Service filed all appllua L401i <br /> with the County EHD for removal of two (2) 3,000 gallon gabuline <br /> tanks and one ( 1 ) 200 gallon waste oil tank from Lhe prupert.y .. <br /> ' The application was approved with changes on Dec-ember 17 , 1986. <br /> EEXHI-BI_T A is a copy of that document. According to a copy of the <br /> Underground Storage Tank Unauthorized Release Contamination Site <br /> Report, dated May 4 , 1988, (see EXHIBIT B, ) the work was per- <br /> formed on April 20, 1987; (however, the ldbvrdLory reporLs show <br /> that soil samples were collected on April 21. ) The comment was <br /> made by the County EHD representative that "soil contamination <br /> ' noted during tank removal & confirmed with soil results. ' The <br /> form does not specify which tank or tanks revealed contamination <br /> during removal; it is assumed that the statement referred to the <br /> removed waste oil tank, since laboratory diialysi5 of Lhe soil <br /> ' samples taken from the two gasoline tanks did not reveal any <br /> contamination -refer to TABLE I & EXHIBIT C for details. <br /> ' After receiving the laboratory results of the soil samples, the <br /> excavation which contained the two gasoline tanks was filled with <br /> clean fill and the removed spoil. Because the samples from the <br /> ' waste oil tank site revealed significant levels of Ethylbenzene, <br /> Toluene , Xylene, & motor oil, (refer to TABLE II & EXHIBIT D for <br /> details , ) that hole was left open pending further work. <br /> ' On June 15, 1987 , the site of the removed waste oil tank was <br /> deepened to about 8 1/2' using a backhoe. Hardpan was encoun- <br /> tered at that depth, and a sample was obtained by driving a clean <br /> brass tube into the bottom of the excavation: the sample was <br /> analyzed for TPH, which revealed levels of 1500 mg/kg gasoline & <br /> 4200 mg/kg motor oil; diesel & kerosene were below detection <br /> ' limits Refer to TABLE III & FXHIBIT_F for details <br /> On August 14 , 1987 , the site of the removed waste oil tank was <br /> reentered, and deepened to 13 1/2 feet, under the direction of a <br /> 3 <br />