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21 October 2002 <br /> AGE-NC Project No 00-0769 <br /> Page 3 of 4 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and BTEX compounds were detected in ground water samples collected from monitoring <br />' wells MW-2B, MW-3A and MW-3B at concentrations ranging between 13,000 pg/l (MW-2B) to a <br /> 21,000 pg/l (MW-3A) BTEX compounds were detected in the same wells at concentrations of <br /> 3,200µg/l(benzene,MW-3A), 1,100 pg/l(toluene,MW-2B),450 pg/l(ethylbenzene,MW-313)and <br />' 5,500 pg/l (total xylenes, MW-313) <br /> 1,2-DCA was detected in ground water sample collected from MW-2B at a concentration of <br />' 240 pg/1 EDB was not detected in any of the ground water samples collected during the May 2002 <br /> monitoring event Fuel oxygenates were not detected in the samples collected from wells MW-2A, <br /> MW-2B, MW-3A and MW-3B <br />' Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> Tables 2 and 3 The laboratory reports for the quarterly monitoring event (CTEL Laboratory IDs <br />' 0208=053-1 through 0208-053-4) QAIQC reports and chain-of-custody form are Included in <br /> Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The findings of the August 2002 site Investigation event Include the following <br />' <br /> Groundwater elevation was approximately 15 feet below MSL m the shallow screened wells <br /> (MW-2B and MW-3B)during the August 2002 monitoring event Ground water was within <br /> the screened interval of monitoring wells MW-2B and MW-3B MW-1 could not be <br /> sampled, access to the well was prevented by a locked gate <br /> • Ground water was approximately 0 14 feet and 0 57 feet lower in the deeper screened <br /> monitoring wells (MW-2A and MW-3A) than in the shallow,screened wells (MW-2B and <br /> iMW-3B) during the third quarter 2002 monitoring event <br /> • TPH-g and BTEX compounds were detected in ground water samples collected from three <br />' of the four sampled monitoring wells (MW-2B, MW-3A and MW-3B) Concentrations as <br /> high as 21,000 pg/l TPH-g,3,200 pg/l benzene(MW-3A), 1,100 pg/1 toluene(MW-2B),450 <br /> pg/1 ethylbenzene(MW-3B)and 5,500 pg/l total xylenes(MW-3B)were detected in samples <br />' collected during the August 2002 monitoring event <br /> 1,2-DCA was detected in the ground water sample collected from monitoring well MW-2B <br /> at a concentration of 240 pg/l, which exceeds California's Maximum Contaminant Level <br /> (MCL) of 0 5 pg/l in drinking water <br /> Advanced Geo Environmental,Inc <br /> 1 <br />