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Quarterly Monitoring and Sampling Report(Q1 2001) 3 <br /> Ranh Market 23569 Santa Fe Road Riverbank Califom,a <br /> Febru iry 16 2001 <br /> Domestic Wells <br /> Four domestic water supply wells are located within 340 feet of the former tank pit (Figure 2) <br /> Well # Location from Tank Pit Comments <br /> DW-1 90 feet west of tank pit Onsite well <br /> DW-2 120 feet south of tank pit Down gradient of tank pit (Well destroyed <br /> January 11, 2001) <br /> DW-3 245 feet south of tank pit Down gradient of tank pit <br /> DW-4 340 feet south of tank pit Down gradient of tank pit <br /> DW-2R 200 feet south of tank pit Down gradient of tank pit (Well installed <br /> December 21, 2000, through January 8, <br /> 2001) <br /> Water samples collected from domestic wells have been analyzed for the presence of BTEX, <br /> TPHg, oxygenates, 1,2-Dichloroethane (1,2-DCA), and 1,2-Dibromoethane (EDB) Since water <br /> samples collected from DW-2 contained reportable concentrations of MtBE, the well was taken <br /> out of service <br /> On April 6, 2000, SECOR's field technician interviewed the property owners or renters <br /> associated with the four domestic water wells and found that water pumped from wells DW-1, <br /> DW-3, and DW-4 was used for irrigation and domestic use All parties interviewed indicated <br /> they were drinking bottled water <br /> Replacement of Domestic Well DW-2 <br /> On January 11, 2001, SECOR oversaw destruction of domestic well DW-2, located south of <br /> Ranch Market (Figure 2) Details of the well destruction are desenbed in SECOR's DW-2 Well <br /> Destruction Report, dated January 23, 2001 <br /> On December 20, 2000, SECOR began oversight of the installation of domestic well DW-2R, the <br /> replacement domestic well for DW-2 From December 28, 2000 to January 5, 2001, the <br /> dedicated well pump, pressure tank, concrete pad, and well-related underground electrical and <br /> water service line was installed Details of the well installation are described in SECOR's <br /> Domestic Well Installation Report(DW-2R), dated February 1, 2001 <br /> On January 8, 2001, SECOR sampled DW-2R and submitted the water sample to Kiff Analytical <br /> for BTEX, TPHg, oxygenates, 1,2-DCA, and EDB using EPA method 8260B The sample was <br /> • also analyzed at CLS for Nitrate/Nitnte using EPA method 300 0 SECOR collected <br /> confirmation water samples from DW-2R on January 11, 2001, and again on January 15, 2001 <br /> Analytical data is summarized in Table 3 <br /> File Riverbank 01-IQ <br />