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TABLE 3 (continued) <br /> ANALYTICAL RESULTS OF WATER SAMPLES <br /> Lockeford Beacon <br /> (ug/L) <br /> Well TPH as Ethyl- <br /> ID Date Gasoline Benzene Toluene benzene Xylene <br /> MW-4 6-16-87 71 1* 20 52 12 41 <br /> 10-7.87 10 7* ND ND ND ND <br /> 4-27-88 20 ND 06 ND ND <br /> 7-26-88 ND 06 ND ND ND <br /> 8-2-89 ND ND ND ND ND <br /> 4-16-91 ND ND ND ND ND <br /> 1-26-94 ND ND ND ND ND <br /> 5-4-94 ND ND ND ND ND <br /> 11-22-94 ND ND 041 ND ND <br /> MW-5 1-26-94 ND ND 077 ND ND <br /> 5-4-94 ND ND ND ND ND <br /> 11-22-94 200 44 13 27 55 <br /> MW-6 1-26-94 ND 2 7 ND ND 1 8 <br /> 5-4-94 ND ND ND ND ND <br /> 11-22-94 ND ND ND ND ND <br /> pg/L = parts per billion(ppb) ' Reported as Total Vol tine Hydrocitbons(modified FPA A4uhod 25)15) <br /> ND = None Detected <br /> 5.0 CONCLUSIONS & RECOMMENDATIONS <br /> 5.1 Hydrocarbon-Int pacted Groundwater <br /> Petroleum hydrocarbons concentrations decreased in MW-2 between May and November <br /> 1994 However, low concentrations of toluene and xylenes remain in MW-2 Samples from <br /> MW-1, MW-3 and MW-6 continue to be non-detect for petroleum hydrocarbons However, <br /> TPH as gasoline and BTE&X were detected in MW-5, an inciease fionl May 1994 The <br /> source of the hydrocarbons in MW-5 is unceitain, since monitoring well MW-5 has remained <br /> up-gradient from the tank excavation and has not been impacted in the past Furthermore, <br /> no impacted soil was encountered during the dulling of MW-5 GeoAudlt recommends that <br /> all wells be re-sampled in February 1995 <br /> 5.2 Hydrocarbon-Impacted Soil <br /> No hydrocarbon odors were noticed during vapor extraction fiom the piping under the tank <br /> pit No organic vapois were detected with the PID Laboiatoiy analysis of air samples <br /> a..t.,�t A.Q 8- 11 <br />