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y <br /> 13 April 1998 <br /> AGE-NC Protect No 95-0144 <br /> Page 3 of 4 <br /> -Analytical results of ground water samples are summarized on Tables 2 and 3 I'he laboratory report <br /> ' (MAI Laboratory 1 D Nos 85614-85622) and chain-of-custody forms are included in Appendix <br /> B <br /> 4 0 SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> r , <br /> • Ground water elevation increased an average of 3 5 feet at the site during the previous <br /> quarter Ground water was approximately four to six feet above the scie erred interval in five <br /> wells and approximately one foot above the screened interval to four wells during the <br /> ' February 1998 sampling event <br /> • Low concentrations of petroleum hydrocarbons were detected in MW-1 TP1=1-d wasdetected <br /> in MW-4 and MW-12 at concentrations slightly above the detection hinit <br /> • PetioIeum hydrocarbons were not detected in samples'collected from MW-2, MW-5, MW-8, ' <br /> • MW-11, MW-13 or MW-18 <br /> • Eleven volatile organic compounds «eie detected by EPA Method 8260 Drinking water <br /> standards have not been established foi ten of the compounds detected Styrene was detected <br /> at a concentration of 1 5 ppb in MW-1 below the established State of California drinking <br /> water maximum contaminant level (MCL) of 100 ppb Oxygenated compounds were not <br /> detected at the site <br /> • The dissolved hydiocai bon plume at the site does not appear to be mi;rating <br /> , <br /> 5 0 RECOMMENDATIONS <br /> ' Based upon data obtained during the February 1998 and previous sampling e�ents, AGE <br /> recommends the following <br /> • Oxygenated compounds have not been detected at the site and should be removed from the <br /> quarterly ground v.atet monitoring analytes <br /> • Quarterly monitoring activities should`be reduced in the vicinity of,USTs No- 3 through 6 <br /> Sampling frequency for monitoring wells MW-5, MW-8, MW-11, MW-12 and MW-18 ' <br /> J should be reduced to an annual event Monitoring wells MW-1, MW-2 MWA and MW-13 <br /> should be sampled quarterly The depth to ground water should be measured in all <br /> . rnonitoring wells for gradient and flow direction determination <br /> Athutrced CcoEmironmental,Inc <br /> , 1 , <br />