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14 June 2004 <br /> AGE-NC Project No 98-0540 <br /> Page 4 of 5 <br /> 3 2 2 Off-site Domestic Well Results <br /> The laboratory analysis detected TPH-g,ethylbenzene and xylenes in ground water samples collected <br /> on 20 November 2003 from domestic wells located at 25272 Hwy 99 and 25144 Hwy 99(Figure 3) <br /> TPH-g was reported at concentrations of 2,400 µg/l and 2,200 µg/1, respectively, xylenes were <br /> reported at concentrations of 5 9 µg/1 and 2 5 µg11, respectively, and ethylbenzene was reported at <br /> 2 1 µg11 in the sample from 25272 Hwy 99 <br /> The two wells were re-sampled on 04 and 10 December 2003 and sent to Cal Tech Environmental <br /> Laboratories (CTEL) and McCampbell Analytical Inc (MAI), respectively No analytes were <br /> detected above laboratory reporting limits from either sampling event or laboratory <br /> No analytes of concern were detected above laboratory reporting limits from the samples collected <br /> from the four domestic wells on 15 March 2004 <br /> Analytical results of ground water samples are summarized in Table 2 Copies of the laboratory <br /> reports(CTEL Project No CT214-0312175,CT214-031113 8,CT214-0312045 and CT214-0403123, <br /> and MAI Work Order 0312216) and chain-of-custody forms are in Appendix B <br /> 4.0. SUMMARY ANIS CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • During the December 2003 monitoring event,the ground water gradient was 0 003 ft/ft with <br /> a flow direction toward the east-southeast During the March 2004 monitoring event, the <br /> groundwater gradient was 0 001 ft/ft with a flow direction toward the south-southeast These <br /> flow directions were consistent with gradients and flow directions from previous monitoring <br /> events <br /> • TPH-g, various BTEX compounds and 1,2-DCA were detected in ground water samples <br /> collected from wells MW-1 and MW-3 during the December monitoring event, however, <br /> only 1,2-DCA was detected in the ground water samples collected from wells MW-1 and <br /> MW-3 during the March 2004 monitoring event March 2003 was the first monitoring event <br /> in which TPH-g and BTEX compounds were not detected in any of the monitoring wells <br /> • The 1,2-DCA concentrations detected in the samples collected from MW-1 and MW-3 <br /> exceeded the State of California's Maximum Contaminant Level (MCL) of 0 5 µg/1 <br /> Advanced GeoEnvironmental,Inc <br />