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Quarterly Monitonng and Sampling Report(Q2 2002) 4 Ranch arket 2 6 to Fe Road Riv rbank aitf rata Jul 2002 • 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 8250B The sample was also analyzed at CLS for nitrate/nitrite using EPA method 300 0 SECOR collected confirmation water samples from DW-2R 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 Infurna 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 Groundwater Monitoring Water Table Elevations and Gradient On April 5, 2002, SECOR personnel measured the depth to water in each of the nine site-related groundwater monitoring wells (Table 3). MW-7 was inaccessible during the monitoring and sampling event A water level indicator was used to gauge the wells to the nearest 0 01 foot A groundwater elevation contour map indicates that groundwater flow is generally toward the south at a gradient of 0 004 ft/ft (Figure 4) Current and historical groundwater monitoring data are summarized in Table 3 Separate-Phase Petroleum Thickness Well gauging and sampling efforts for the second quarter 2002 did not detect separate-phase petroleum hydrocarbons (SP) in any of the wells monitored (Table 3) Historically, SP has not been present in the groundwater monitoring wells at the site File Ranch MarketlReport\Riverbank-02-2Q