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�'-- � -�•.�" Yom. �� .'.'—� S' >• '� _ �� - ..S Tib '�Y' �w r• - ux'E� - PHASE_I HYDROGEOLOGIC[NVES'IiGA710N WORK PLAN 4491 West Durham Ferry Road,Tracy,Calfomia Delta Project Na 40-91-732 Page 2 ,/e Purge three well casing volumes of water from each monitoring well and measure pH, temperature,and conductivity. Purge water will be contained in 55-gallon drums. /s Collect and submit three ground water samples to a state-certified laboratory for chemical analysis using EPA Methods 8015 and 8020 for TPH and BTEX with a 10 working day turnaround time..One water sample will be collected from an existing monitoring well Survey the relative lateral and vertical locations of the ground water monitoring wells. i Prepare a report with the chemical results,field results,conclusions,and recommendations. 2.0 BACKGROUND INFORMATION 2.1 Site Description The site is located approximately 7.5 miles southeast of the city of Trac ,California,at the northeast cortxer of the intersection of Durham Ferry Road and Bird Road at 4491 West Durham Ferry Road, ! Tracy,California.(SW 114,SW 114,Section 18,T3S.,R6.E.(Figure 1). I The site elevation is approximately 1001 feet above meal sea level(MSL)as depicted on the U.S.Geological Suave?t,Vernalis,California,Quadrangle(1969:photorevised 1980). The regional slope of the land is toward the northeast 2.2 Site H ckground Ms.Stella Ruiz purchased the property from Mr.Eugene Heitt in May 1986. In February 1988,Petro Check removed two 1,000-gallon underground storage tanks which had contained leaded and unleaded gasoline. Soil samples were collected from beneath each tank and submitted for chemical analysis. 0 installed north of the tank locations by Water Works. A On May 27, 1988, monitoring well MW-1 was ground water sample was collected on June 13, 1988, from monitoring wc11 MW-1 and analyzed for `~ petroleum constituents. The results of the chemical analysis indirated concentrations of 1.6, 16.5, and ---- - - �T2,47-parts-W-billion for benzene; toluenc;"and-total-petroleum-hydrocarbons;-respectively. -Farther- k investigation was requested by the County of San Joaquin in a letter dated_Tune 11, 1991.