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i i • Former Canteen Facility January 20, 2003 narterl Groundwater Monitoring Report Page 4 I • Total xylenes were detected in monitor wells MW-3, MW-3D, and MW-13A at concentrations ranging of 1 3, 25, and 2 4 µg/l, respectively No samples Iexceeded the CAMCL for xylenes (1,750 Etg/L) • TPH(g) was detected in monitor wells MW-3 and MW-3D at concentrations of I140 and 460 µg11, respectively • MTBE was detected in MW-3, MW-3A, MW-3D, and MW-11 at concentrations ranging from 14 µg11 to 270 �Lg/l The CAMCL for MTBE is 13 µg11, exceeded in MW-3,MW-3A, MW-3D, and MW-11 • 1,2-DCA was detected at a concentration of 12 µg/L in MW-11, which exceeds the CAMCL of 0 5 jig/L IHistoricalgroundwater analytical results are summarized on Table 2 Figures 3 and 4 illustrate the concentrations for benzene and TPH(g), respectively, in the shallow aquifer wells Figures 5 10 and 6 illustrate the concentrations for benzene and TPH(g), respectively, in the one deep aquifer well (MW-13B) The field notes and laboratory reports for this quarterly monitoring event are Iattached as Appendix A INVESTIGATION SUMMARY and CONCLUSIONS Sampling and analysis was performed in October and December 2002 to evaluate the current concentrations of petroleum hydrocarbons of Site groundwater monitoring wells Based on the Iresults, AES-RS has developed the following conclusions • Monitor wells MW-3, MW-3A, MW-3D, and MW-11 had detectable concentrations I exceeding the CAMCL concentrations of at Ieast one of the following constituents benzene, MTBE, and 1,2-DCA ' • Groundwater impacts appear to be generally confined onsite, although the only detectable 1,2-DCA concentrations are centered offsite on monitor well MW-11 The majority of the groundwater impacts are centered on the MW-3 and MW-13 series ' wells ' RECOMMENDATIONS AES-RS recommends the following for the Former Canteen Facihty ' 1.1ctlt,qV�b $u