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63 05 ft - 62 45 ft = 0 . 06 ft <br /> Hydraulic gradient (h/L) = 0 . 060 ft/106 ft or 0 0057 ft/ft <br /> Table 5 <br /> Wellhead Elevations , Depths of Groundwater, and Groundwater <br /> Elevations at 2360 East Street , Tracy <br /> June 24 , 1994 <br /> well Wellhead Depth to Groundwater <br /> Number Elevation Groundwater Elevation <br /> ------------------------------------------------------- <br /> MW-1 69 . 73 ft 7 30 ft 62 43 ft <br /> MW-2 69 68 ft 6 98 ft 62 70 ft <br /> MW-3 69 . 65 ft 6 54 ft 53 11 ft <br /> -----------------------------------------_--------------- <br /> Data Review <br /> As part of the process to complete the determination of the <br /> extent of contamination and prepare for remediation, EPM <br /> has reviewed records pertaining to prior environmental <br /> compliance activities at the site As a result of this <br /> review, EPM wishes to note the following <br /> The site was operated as a retail gasoline service station <br /> for 39 years , closing during April of 1991 Three under- <br /> ground storage tanks were present , three 5 , 500 capacity <br /> fuel tanks and one 350 gallon capacity waste oil tank <br /> In recent years , one of the fuel tanks contained diesel <br /> fuel , one contained unleaded gasoline , and the third super <br /> unleaded gasoline <br /> During September , 1990 , a discrepancy was noted in tank <br /> inventory records In December of the same year, tank <br /> integrity testing was performed Tank 1 failed its test <br /> During January, 1991 , product lines were tested During <br /> the course of the test , 300 gallons of gasoline was lost <br /> from Tank 1 . It appears that no action was taken to <br /> contain or recover the lost fuel until April 11-12 , 1991 , <br /> when all underground storage tanks were excavated and <br /> removed and soil samples were acquired from the tank pits <br /> and pipeline trenches During December, 1991 , three <br /> groundwater monitoring wells and ten soil borings were <br /> drilled and logged, and soil samples acquired . On March <br /> 17 , 1994 , four soil borings were augered through the <br /> sidewalk dust north of the site Each of the borings were <br /> logged Soil and grab water samples were obtained <br /> Page 8 <br />