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1 <br /> 02 October 2000 <br /> AGE-NC Project No 98-0465 <br /> Page 8 of 9 <br /> ' Analytical results of water samples collected during July 2000 are summarized on Table 3, The <br /> laboratory report (MAI Lab No 43255 through 43258), QA/QC report and chain-of-custody form <br /> ' are included in Appendix G <br /> ' 5.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> ' e The static water level was determined to be approximately 10 feet below the well casing tops <br /> The prevailing ground water flow direction in July in this area was toward the northwest <br /> G None of the analytes tested for in the soil samples analyzed from MW-1 through MW-4 were <br /> detected at or above laboratory reporting limits <br /> ' O TPH-g, TPH-d, BTEX compounds and TAME, ETBE, DIPE and TBA, were not detected <br /> at or above laboratory reporting limits in the ground water samples analyzed from MW-1 <br /> through MW4 <br /> 0 Dissolved MTBE is present in the area of the former USTs and extends to the north In the <br /> area of the dispenser island, past MW-1 but does not extend to or past MW-2 <br /> ' G The lateral extent of dissolved MTBE has been defined to the north but remains undefined <br /> to the east, west and south <br /> ' G The State of California Department of Health Services has adopted a concentration of 13 ,ug/l <br /> as an action level(ALs) for MTBE in March 1999, and has adopted a concentration of 5 �zg/l <br /> as a secondary maximum contaminant level (MCL) in January 1999 The Concentration of <br /> dissolved MTBE detected in the ground water samples collected from MW-1, MW-2 and <br /> MW-4 were above the secondary MCL Concentrations of dissolved MTBE detected in the <br /> water samples from MW-3 and MW-4 were above the AL <br /> ' 6.0. RECOMMENDA'T'IONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> ' Initiation of quarterly momtoring/sampling to further assess the dissolved MTBE <br /> contamination The next quarterly momtonng/sarnpling event should be scheduled for <br /> October 2000 <br /> Advanced GeoEnvironmental,Inc <br />