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i <br /> Joaquin County Flood Control District, groundwater was measured <br /> at between 60 ' & 70 , bgl in this area. Based upon published <br /> data, the highest water level in the last 10 years was measured <br /> at about 27 ' bgl . Groundwater was located at about 53 ' below <br /> grade during purging & sampling operations conducted in October, <br /> 1994 . Groundwater measurements during sampling operations <br /> conducted in March, 1995 , revealed that the water table had risen <br /> 4 681 , to 48 41 ' bgl The average depth to water measured after <br /> completion of the two new wells, (on June 8, ) was 45 28 ' bgl <br /> PRIOR USE OF REMOVED UST' S- <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 oil 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 5 ' <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 <br /> approximately 23 ' below grade. Laboratory analysis showed that <br /> oil, as motor oil, was present at 280 mg/kg This work was not <br />• witnessed by the County EHD <br /> 3 <br />