ARCHIVED REPORTS XR0008511 - Laserfiche WebLink

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' PRIOR USE OF REMOVED LIST'S: The site had been the location of a gasoline station for many ' years, the removed tanks had been used for dispensing gasoline and storing waste oil. The property is presently being used as an automotive tune-up & repair facility, the dispensing Pumps & associated piping were removed along with the tanks. There are no records available concerning the dates that the tanks were installed_ ' SUMMARY OF PRIOR WORK DONE On December 5, 1986, Western Meter Service filed an application with the County EHD for removal of two (2) 3,000 gallon gasoline tanks and one (1) 200 gallon waste oil tank from the property The application was approved with changes on December 17, 1986the EXHIBIT A is a copy of that document According to a copy t Underground Storage Tank Unauthorized Release Contamination Site Report, dated May 4, 1988, (see EXHIBIT B. ) the work was performed on April 20 , 1987 ; (however, the laboratory reports show that soil samples were collected on April 21 ) The comment was made by the County EHD representative that soil contamina- tion noted during tank removal & confirmed with soil results The form does not specify which tank or tanks revealed contami- ' nation during removal; it is assumed that the statement referred to the removed waste oil tank, since laboratory analysis of the line soil samples taken rtoo theTABtwo I &gaso ks d for detid ails. reveal any fer ils ' contamination After receiving the laboratory results of the soil samples, the excavation which contained the two gasoline tanks was filled with ' clean fill and the removed spoil. Because the samples from the waste oil tank site revealed significant levels of Ethylbenzene, Toluene, Xylene, & motor oil, (refer to TABLE II & EXHIBIT D for ' details, ) that hole was left open pending further work. On June 15, 1987, the site of the removed waste oil tank was ' deepened to about 8 1/2' using a backhoe Hardpan was encoun- tered at that depth, and a sample was obtained by driving a clean brass tube into the bottom of the excavation- the sample analyzed for TPH, which revealed levels of 1500 mg/kg gasoline & 4200 mg/kg motor oil; diesel & kerosene were below detection limits. Refer to TABLE III & EXHIBIT E for details. On August 14 , 1987 , the site of the removed waste oil tank was reentered, aofetheed to EHD. lA soilfeet, sampleunder was takendirection that depth representative 3