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4.2 Laboratory Evidence of Contamination <br /> TPH as gasoline was detected in the water sample from MW-2 at 230 ppb. Benzene, <br /> toluene and xylenes were detected at 1.8 ppb, 18 ppb and 12 ppb respectively. No <br /> petroleum hydrocarbons were detected in any other samples The analytical results are <br /> summarized on 'fable 2 The laboratory report and chain-of-custody are included in <br /> Appendix B. <br /> TABLE 2 <br /> ANALYTICAL RESULTS OF WATER SAMPLES <br /> Lockeford Beacom <br /> (µ9/L) <br /> Well TPH as Ethyl- <br /> ID Date Gasoline Benzene Toluene benzene Xylene <br /> MW-1 6-16-87 55* 33 5 3 ND 3 8 <br /> 10-7-87 190* 0.6 ND ND ND <br /> 4-27-88 90 12 ND ND ND <br /> 7-26-88 100 15 05 ND ND <br /> 8-2-89 25 ND ND ND ND <br /> 4-16-91 ND ND ND ND ND <br /> 11-12-92 ND 0 7 2 0 ND 14 <br /> 1-26-94 ND ND ND ND ND <br /> 5-4-94 ND ND ND ND ND <br /> MW-2 6-16-87 2,749` 147 113 61 328 <br /> 10-7-87 2,135* 438 55 49 246 <br /> 4-27-88 930 249 0 9 - 31 3.9 <br /> 7-26-88 520 35 4 11 3.4 89 <br /> 8-2-89 1,100 39 22 15 99 <br /> 4-16-91 ND 13 ND ND 14 <br /> 11-12-92 ND ND 18 ND 11 <br /> 1-26-94 85 2.4 099 ND 11 <br /> 5-4-94 230 18 18 ND 12 <br /> MW-3 6-16-87 5,959* 432 92 31 128 <br />' 10-7-87 260* 10 ND ND ND <br /> 4-27-88 30 19 ND ND ND <br /> 7-26-88 50 12 06 ND ND <br />' 8-2-89 ND ND ND ND ND <br /> 4-16-91 ND ND ND ND ND <br /> 11-12-92 ND 46 22 ND 13 0 <br />' 1-26-94 ND ND ND ND ND <br /> �bA�&5—m-,1-- 8 <br /> ndcbrd Bwma Qit?JS9Yaddb <br />