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1 <br />' The site had been the location of a gasoline station for many <br /> years, the removed tanks had been used for dispensing gasoline <br /> and storing waste owl The property is presently being used as <br /> an automotive tune-up & repair facility; the dispensing pumps & <br />' associated piping were removed along with the tanks . There are <br /> no records available concerning the dates that the tanks were <br /> installed <br /> SUMMARY OF PRIOR WORK & PERTINENT DATES <br /> December, 1986 - Application filed by Western Meter Service to <br />' remove two (2) 3 , 000 gallon gasoline tanks and one (1) 150 gallon <br /> waste oil tank from the property. <br /> April, 1987 - The 3 tanks were removed and soil samples taken <br /> Laboratory analysis of samples from beneath the gasoline tanks <br /> were below detection limits , but the soil sample from the waste <br /> oil site revealed the presence of ethylbenzene, toluene, xylene, <br /> TPH-G, & motor oil Refer to TABLES I & II for details <br /> June, 1987 - Site of removed waste oil tank was deepened to about <br /> 8 1/2 ' with a backhoe A sample was taken at that depth and <br /> analyzed for TPH; gasoline was measured at 1500 mg/kg, & motor <br /> oil at 4200 mg/kg, diesel & kerosene were below detection limits <br />' Refer to TABLE III for details <br /> August, 1987 - Waste oil tank site reentered & deepened to 13 51 <br /> under direction of the EHD A soil sample taken at that depth <br />' was analyzed for benzene, toluene, xylene, & TRPH Motor oil was <br /> measured at 3100 mg/kg; all others were below detection limits . <br /> Refer to TABLE IV for details <br /> October, 1989 - Site was reentered & soil sample taken at approx- <br /> imately 23 ' below grade. Laboratory analysis showed that oil, as <br />' motor oil, was present at 280 mg/kg. This work was not witnessed <br /> by the County EHD <br /> October 27 & 28, 1993 - Four (4) soil borings were placed on the <br /> site under the direction of Wm Hunter, RG, using Spectrum <br /> Exploration auger rig & personel . The locations of those somal <br /> borings are shown on PLATE III Laboratory analyzes from soil <br />' samples taken during the placement of the soil borings are <br /> summarized on TABLES V, VI, & VII For details of that work, <br /> refer to the WJH January, 1994 report titled "PROBLEM ASSESSMENT <br /> REPORT COVERING SOIL CONTAMINATION INVESTIGATION" <br />' September 30, 1994 - One (1) 21, diameter monitoring well was <br />' 3 <br />