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1 ethylbenzene is 700 µg/1, which was exceeded only in MW-13 The concentration <br /> increased in MW-1, MW-3A, MW-8, and decreased in MW-3D, MW-13 and <br />' MW-13A <br /> • Xylenes were detected in monitor wells at concentrations ranging from 0 67 to <br />' 14,000 µg/1 The CAMCL for xylenes is 1,750 µg/L Only the groundwater <br /> sample from MW-13 exceeded the CAMCL for xylenes This concentration <br /> decreased since the September 2000 sampling event <br />' • TPH(g) was detected in monitor wells MW-1, MW-3A, MW-3D, MW-13 and <br /> MW-13A at concentrations ranging from 67 to 110,000 µg/l <br />' • Of the oxygenates analyzed, the following were detected Methyl-t-Butyl Ether <br /> (MTBE), was detected in MW-3, MW-3A, MW-3D, MW-8, MW-11 and MW- <br /> 13A at concentrations ranging from 1 4 µg/l to 1,500 pg/l The CAMCL for <br /> MTBE is 13 µg11 The concentrations reported for MW-3, MW-3A, and MW-13 <br />' exceed this CAMCL The concentration of MTBE increased in all monitor wells in <br /> which MTBE was detected <br />'• • Other oxygenates detected were 1,2 DCA at a concentration of 15 µg/L in MW-11 <br /> and TBA at a concentration of 360 pg/L in MW-13 Both of these detected <br /> concentrations were increases since the September 2000 sampling event <br /> rGroundwater analytical data are summarized on Table 2 <br /> INVESTIGATION SUMMARY and CONCLUSIONS <br /> Sampling and analysis was performed in December 2000 to evaluate the current concentrations of <br /> petroleum hydrocarbons of on-Site groundwater Based on the results, AES has developed the <br /> following conclusions <br />' • Monitor wells MW-1, MW-3, MW-3A, MW-3D, MW-10, MW-13 and MW-13A had <br /> detectable concentrations that exceeded the target cleanup criteria of at least one of <br /> the following constituents benzene, toluene, ethylbenzene, xylenes and MTBE <br /> • Groundwater impacts appear to be confined onsite, since offsite monitor wells MW-8 <br />' and MW-9 do not have detectable BTEX constituents The majority of the <br /> groundwater impacts are centered on the MW-3 and MW-13 series wells <br /> I <br /> Canteen Facility January 15, 2001 <br /> Quarterly Groundwater Monitoring Report Page 4 <br /> 1 <br />