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-rte . -anFc A- <br /> T <br /> i <br /> I <br /> r <br /> sj <br /> SRO <br /> is <br /> "~ Table 2 Continued <br /> Juiy, 1991 <br /> Constituents Sample I'J Action <br /> i <br /> uA „MW-1 MW-2 MW-3 MW B* Levels <br /> ' Benzene ND ND ND ND 5 <br /> Toluene ND ND ND ND 100 <br /> Xylene ND ND ND ND 620 <br /> EthyIbenzene ND ND ND ND 680 <br /> No. 2 Diesel -- -- -- -- 100 <br /> i Dichlorodifluoromethane ND NL? ND ND — <br /> 1,1,1 Trichloroethane 7 I+ID 0.4 ND 200 <br /> 1,1 Dichloroethane 9 ND ND ND 20 <br /> Chloroethane ND ND APJ ND <br /> Tetrachloroethylene ND 0.8 ND ND 4 <br /> Chloroform ND MD ND ND -- <br /> Dibromochloromethane <br /> NI) ND NU ND -- <br /> DichIoromethane ND ND ND ND 40 <br /> 1,1 Dichloroethylene 3 ND ND ND 6 <br /> f Tetrachloroethane 0.3 ND ND ND <br /> f i <br /> No petroleum hydrocarbon products have been found in any of the three groundwater monitoring <br /> wells. However, all three wells, have contained traces of several purgeabie halocarbons. It is <br /> now believed that the majority of the chlorinated compounds present are derived from the <br /> i dealerships wash rack operation where new cars are prepared for delivery. Since new cars are <br /> "7 usually protected with a coat of heavy wax as well as oils and grease, it is I&ely that certain <br /> solvents were 7,sed that may have contained most of the chlorinated compounds discovered in the <br /> groundwater. There is currently no containment of the wash water which is generally discharged <br /> tto the surface and eventually to the City sewer system. It is possible therefore, that over the <br /> years this practice has Ied to the low levels of these compounds in the shallow groundwater <br /> beneath the site. <br /> - MW-3 also contains t1t innocuous halocarbon, dichloradifluoromethane. This non-flammable <br /> i compound has been used as a refrigerant,as an aerosol propellant and as a leak-detecting agent. <br /> There are no State or EPA Action levels associated with this substance,and in fact,may very well <br /> have been introduced during previous tank tightness testing procedures. Alternatively, the <br /> compound may have originated from a former dairy,located across North B Street. It is possible <br /> that dichlorodifluoromethane was used extensively by the diary for the freezing of products and/or <br /> containers. This second alternative provides an explanation for the occurrence of the compound <br /> in MW-3,the well closest to the former dairy;while not being detected in MW-1,the well located <br /> 13 <br /> r <br /> f" <br />