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Work Plan For Additional Groundwater Assessment 4 Ranch Market 23569 South Santa Fe Road Riverbank California May 10 2001 Water samples collected from domestic wells have been analyzed for the presence of BTEX, TPHg, five oxygenates, 1,2-Dichloroethane (1,2-DCA), and 1,2-Dibromoethane (EDB) Since water samples collected from DW-2 contained reportable concentrations of MtBE, the well was taken out of service On April 6, 2000, SECOR's field technician interviewed the property owners or renters associated with the four domestic water wells and found that water pumped from wells DW-1, DW-3, and DW-4 was used for irrigation and domestic use All parties interviewed indicated they were drinking bottled water Replacement of Domestic Well DW-2 On January 11, 2001, SECOR oversaw destruction of domestic well DW-2, located south of Ranch Market (Figure 2) Details of the well destruction are described in SECOR's DW-2 Well Destruction Report, dated January 23, 2001 On December 20, 2000, SECOR began oversight of the installation of domestic well DW-2R, the replacement domestic well for DW-2 From December 28, 2000 to January 5, 2001, the dedicated well pump, pressure tank, concrete pad, and well-related underground electrical and water service line was installed Details of the well installation are described in SECOR's Domestic Well Installation Report(DW-2R), dated February 1, 2001 On January 8, 2001, SECOR sampled DW-2R and submitted the water sample to Kiff Analytical for BTEX,TPHg, oxygenates, 1,2-DCA, and EDB using EPA method 8260B The sample was also analyzed at CLS for Nitrate/Nitnte using EPA method 300 0 SECOR collected confirmation water samples from DW-211 on January 11, 2001, and again on January 15, 2001 Analytical data is summarized in Table 3 After review of the confirmation samples, the San Joaquin County Environmental Health Department (SJCEHD)requested the well be brought online On January 18, 2001, SECOR met with Mr Michael lnfuma with SJCEHD for the final inspection of well DW-2R The water service from the Aero Pure Water supply tank was disconnected and the water valve was opened, allowing DW-2R to supply water to the home on the Pantoja Property HydroQeology The depth to groundwater ranges from 26 to 32 feet bgs in the on-and-offsite wells Historically, groundwater flow direction has been southerly Groundwater gradient was 0 005 foot per foot in the second quarter 2001 Surface drainage is to the southeast, towards the Stanislaus River, located approximately 750 feet south of the Site i Litholoey Based on the description of the soil samples collected from the soil borings, the lithology at the File Ranch Market\WorkPlanXRb-CPT Workplan doc