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- I <br /> [ 25 October 1999 <br /> AGE-NC C Project No 96-0254� <br /> t <br /> Page 3 of 4 <br /> micrograms per liter (,ug/1) and 2,400 µg/1 , respectively TPH-d was detected in the samples <br />' collected from wells MW-1B at a concentration of 210 µg/l Benzene was detected in samples <br /> collected from wells MW-1A and MW-1B at concentrations of 5 7 µg/l and 540 ug/l, respectively <br /> The samples from the remaining wells did not contain detectable concentrations of benzene <br />' <br /> Toluene and xylenes were detected in samples from wells MW-lA and MW-1B at concentrations <br />' as high as 200 µg/1 (toluene, MW-1B) and 120 µg/l (xylene, MW-1B) Ethylbenzene was only <br /> detected in well MW-2B at a concentration of 58 µg/1 <br />' r Laboratory results of ground water samples analyzed for petroleum hydrocarbons are summarized <br /> [ in Table 2 and 3 The laboratory reports (MAI Laboratory ID 19765 to 19771), QA/QC reports and <br /> G chain-of-custody forms are included in Appendix B <br /> 1 t <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> 1 <br /> i <br /> The following conclusions were drawn from the results of this investigation <br />' • The prevailing ground water flow direction at the site is generally northeast <br /> • Significantly impacted ground water was encountered in samples from monitoring wells <br />' MW-lA and MW-1B, with benzene concentrations exceeding the State of California <br /> maximum contaminant level (MCL) of 1 ppb <br /> [ • MTBE was detected in two well on the site, one sample contained MTBE at a concentrations <br /> hat exceeds the State of California action level (AL) of 14 ppb <br /> 1 [ <br /> 5.0. RECOMMENDATIONS <br />' Based on the results of this investigation, AGE recommends <br />' A quarterly monitoring event should be scheduled for December 1999 and should be <br /> conducted concurrently with the monitoring event for the 2420 Grant Line Road site <br /> C <br /> Advanced GeoEmironmental lne <br />