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Quarterly Monitoring and Sampling Report(Q2 2001) 5 <br /> Ranch Market 23559 Santa Fe Road Riverbank Cahfomta May 10 2001 <br /> • parts per billion (ppb) and 5,600 ppb, respectively (Figure 5) The highest MtBE and TBA <br /> concentrations were detected in monitoring well MWA at 410 ppb and 130 ppb, respectively <br /> TBA was also reported in MW-5 at a concentration of 7 2 ppb 1,2-DCA was reported in MW-5 <br /> at a concentration of 12 ppb No other oxygenates or EDB were reported above the laboratory <br /> detection limits in samples collected from the monitonng wells The water samples collected <br /> from domestic wells DW-1, DW-2R, DW-3, and DW-4 did not contain detectable concentrations <br /> of TPHg, BTEX, oxygenates, 1,2-DCA, or EDB Copies of the laboratory analytical reports and <br /> chain-of-custody manifests are included in Attachment 4 <br /> Conclusion <br /> Ten groundwater monitoring wells and four domestic water wells were sampled this quarter <br /> Groundwater elevation declined an average 0 46 feet since January 2001 Referring to Table 3, a <br /> significant increase in the concentration of benzene, TPHg, and MtBE was observed in wells <br /> MW-2, MW-3, and MW-4, which are centered about the former tank pit A lesser increase was <br /> observed in MWA, also centered about the former tank pit MW-6, located upgradient of the <br /> former USTs, MW-8, located cross gradient of the former USTs, and MW-7, located <br /> downgradient of the former UST, were reported to contain TPHg In MW-7, an increase in <br /> benzene was also observed <br /> Future Work <br /> Future work planned in the second and third quarters 2001 include the following tasks <br /> • Conduct third quarter monitoring and sampling event <br /> • Conduct monthly sampling of domestic well DW-1 <br /> I <br /> File Ranch Market\Report\Riverbank-01-2Q doc <br />