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