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30 May 2000 AGE-NC Protect No 96-0254 Page 3 of 3 ground water samples Labor atoi y results of ground water samples analyzed foi pets oleum hydrocarbons are suinmanzed I sn Table 2 The laboratory reports (MAI Laboratory ID 33507 to 33516), QA/QC reports and chain- of-custody forms ai e included in Appendix B 4.0 SUMMARY AND CONCLUSIONS ' The following conclusions were drawn from the results of this investigation • Ground water at the site was encountered at a depth of approximately 6 6 to 9 feet bsg The pi evading gi ound water flow direction at the site is generally northward • Petroleum hydi ocas bon-impacted gi ound water was encountered in samples from monitoring wells MWA B, MW-4, and MW-7 with benzene concentrations exceeding the State of California maximum contaminant level (MCL) of 1 ppb Figure 4 depicts the benzene isocontoui s 1 • • MTBE was detected in foul wells at the site, the concepti ations are all below the MTBE i State of California action level (AL) of 14 ppb 5.0. RECOMMENDATIONS Based on the i esults of this investigation, AGE recommends • A quarterly monitoring event should be scheduled for June 2000 and should be conducted concurrently with the monitoring event for the 2420 Grant Line Road site 6.0. LIMITATIONS ' Oui pi ofessional sei vices wei e performed using that degree of care and skill of dinanly exercised by environmental consultants pi acticing in this os similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (i e monitoring well ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional . recommendations contained in this report Advanced GeoEtivironmental Inc