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TABLE 2-Continued GROUND WATER SAMPLE ANALYTICAL RESULTS Concentrations in micrograms per liter (Ag/l) Monitoring Ethyl- Total TPH' as Well Date Benzene Toluene benzene Xylenes gasoline MW-5 02/10/92 19 <05 <05 <05 51° 03/18/92 06 <05 <05 <05 <NY 06/04/92 10 <05 <05 <0 5 <50 09/28/92 07 <05 <05 <05 69 12/18/92 12 <0.5 <05 <0 5 77 04/05/93 <05 <05 <0 5 <0 5 <50 09/23/93 <05 1 0 06 22 <50 11/15/93 <05 <05 <05 <0 5 <50 02/10/94 62 <05 <05 <0 5 <50 05/31/94 <05 <05 <0.5 <0 5 <50 MW-6 02/11/92 06 <05 <0.5 <05 5I 03/18/92 06 <05 <05 <0 5 <50' 06/04/92 <05 <05 <05 <05 <50 09/28/92 <05 <05 <05 <05 <50 12/18/92 <05 <05 <05 <05 <50 04/05/93 <0 5 <05 <05 <05 90b 09/23/93 <05 0 8 <05 15 52 11/15/93 <05 <05 <05 <05 <50 02/10/94 07 <05 <05 <05 <50 05/31/94 <05 <05 <05 <05 <50 MW-7 05/31/94 <05 <05 <05 <05 <50 MW-8 05/31/94 <05 <05 <05 <05 <50 Total Petroleum Hydrocarbons b Atypical chromatogram with unidentified peak(s) wtthun the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected A ground water sample collected from monitoring well MW-6 on April 17, 1992, contained chlorobenzene and 1,2-dichlorobenzene Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992 (past EPA recommended holding time),was positive for the following chlorinated hydrocarbons vmylchloride,cis-1,2- dnchlorethene,trichloroethene and tetrachlorethene. These peaks resulted in a positive fuel hydrocarbon result n Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected. Atypical chromatogram. An unknown peak was observed between MTBE and benzene Chlorinated hydrocarbons are suspected Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992 (past EPA recommended holding time)was positive for the following chlorinated hydrocarbons chlorobenzene and 1,2- dichlorobenzene Ljkp403 TA