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_ _ OWN <br /> .v <br /> r <br /> i <br /> la <br /> - r <br /> PHASE I HYDROGFOLOGIC iN)LEMOAnON V4'ORK PIAN <br /> 4491 West Derham Ferry Road,Tracy,Cafifaraia <br /> Delta Projeex Na 40.91-732 <br /> Pagc 2 <br /> / • Purge three well casing volumes of water from each monitoring well and measure pH, <br /> temperature,and conductivity. Purge water will be conWned in 55-gallon drums. <br /> Collect and submit three ground water samples to a state-certified laboratory for chemicaj <br /> analysis using EPA Methods 8015 and 8020 for TPH and BTEX with a 10-working day <br /> turnaround time. One water sample will be collected from an existing monitoring well <br /> Survey the relative lateral and vertical locations of the ground water monitoring wells. <br /> ` t <br /> z o Prepare.a repoit with the chemical results,field results,conclusions,and recommendations. <br /> . I <br /> 2.013ACKGROIIji111NF0RMAT10N <br /> € 2.1 Site Drserl tion <br /> The site is located approximately 75 miles southeast of the city of Tracy,California,at the northeast corner <br /> Of the intersection of Durham Ferry Road and Bird Road at 4491 West Durham Ferry Road, <br /> Tracy,California.(SW 1f4,SW 114,Section 18,T.3S.,R.6.E(Figure 1). <br /> • 'r The site elevation is approximately 100 feet above mean sea level(MSL)as depicted on the U.S.Geological <br /> Survey,Vernalis,California,Quadrangle(1969:photorevised 1980). The regional slope of the land is toward <br /> r. � the northeast. <br /> 2,2 Site d <br /> . Ms.Stella Ruiz purchased the property from Mr.Eugene Heitt in May 1%& In February 1988,Petro Check <br /> removed two 1,004-gallon underground storage tanks which had contained leaded and unleaded gasoline <br /> 1 <br /> Soil samples were collected from beneath each tank and submitted for chemical analysis. <br /> Ori May 27, IN%monitoring well MW-1 was installed north of the tank locations by Water Works. A <br /> gmund water sample was collected on June 13, 1988, from monitoring well MW-1 and atnalyzed for <br /> results of the chemical analysis indicated wncentrations of 1.6, 165, and <br /> petroleum constituents. The <br /> 1 247 parts per bi'.lion for.benzene, toluene, and total petroleum hydrocarbons, respectively. Further <br /> fti in ;1991 <br /> investigation was requested by the County of Sart Joaqua letter dated June Ii <br /> fry ,. <br />