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0�9-n sP <br /> a <br /> OMNI <br /> .` 5.2 Water Samples . <br /> On May 30, 1990,Murray &Associates collected duplicate p groundwater samples from all <br /> three monitoring wells. A field blank, Iabeled.MW-B was also collected as a split sample <br /> from MW-3• MW B was used as a field blank as a part of normal quality assurance <br /> Procedures. Each sample was evaluated for total petroleum hydrocarbon constituents and <br /> purgeable halocarbons. The results of these analyses are summarized in Table 2. Complete <br /> analytical reports are presented in Appendix 2. Included in Table 2 are the relative State <br /> or EPA Action levels for each of the constituents analyzed. <br /> Table 2 <br /> Analytical Results -- Water Samples <br /> Constituents <br /> Sample ID <br /> u <br /> MW-1 Action <br /> Action <br /> MW-2 MW-3 MW-B* Levels <br /> Benzene ND ND ND ND <br /> Toluene ] $ <br /> Xylene ND ND ND 100 <br /> ND ND ND ND 620 <br /> EthyIbenzene ND <br /> 1 ND ND ND 6$0 <br /> No. 2 Diesel=' ND ND ND ND 100 <br /> Dichlorodifluoromethane ND ND 26 37 <br /> 1,1,1 Trichloroethane 4.2 ND <br /> ,. 1,1 Dichloroethane 1.2 12 200 <br /> 8.3 ND ND ND 20 <br /> Chloroethane 0.9 ND ND ND -- <br /> *MW-B was a field blank, and represents of duplicate split derived from MW-3. <br /> ND = Not detected, <br /> No petroleum hydrocarbon products were found in any of the three groundwater monitoring <br /> wells. However,MW-1 and MW-2, both contained traces of several purgeable halocarbons. <br /> Both MW-1 and MW-3 contained minor levels of 1,1,1 trichloroethane, a solvent generally <br /> used for the cleaning of precision metal parts. MW-1 contained 4.2 ug/L,and MW-3, 1.2 <br /> ug/L.. Both State and EPA Action levels for drinking watt:standards are set at 200 <br /> level of trichloroethane is well below a level that would be a cause:for <br /> concern. The remaining purgeable halocarbons found in MVN'-1, 1,1 dichloroethane, and <br /> �a <br /> � ' ll <br /> .. - .. <br />