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25 Groundwater Monitoring <br /> Five monitoring events have been conducted at the site since the installation of MW-1 in <br /> June 1992. TPH as gasoline has been detected in all five samples collected from MW-1 at <br /> j concentrations of 99 ppb to 260 ppb. TPH as diesel was also detected in the initial sample <br /> from MW-1 at a concentration of 310 ppb. <br /> TPH as diesel was detected in one sample from MW-3 at a concentration of 140 ppb. <br /> Laboratory error was suspected and MW-3 was resampled. No contamination was detected <br /> in the resample. Benzene and toluene have been detected in samples from MW-1 and MW- <br /> 4. Xylenes were also detected in one sample from MW-1. No contamination has been <br /> detected in samples from MW-2 or MW-5. Water sample analyses are summarized in Table <br /> 2. <br /> TABLE 2 <br /> ANALYTICAL RESULTS OF WATER SAMPLES <br /> Western Lift <br /> ,Ug/L <br /> Sample ID TPH as TPH as Ethyl- Total <br /> Gasoline Diesel Benzene Toluene benzene Xylenes <br /> MW-1/6-4-92 260 310 ND ND ND ND <br /> . MW-1/11-24-92 220 ND 15 0.30 ND ND <br /> MW-1/6-21-93 99 ND 9.9 ND ND ND <br /> MW-1/10-8-93 120 ND 8.9 0.36 ND 0.68 <br /> MW-1/2-9-94 140 ND 7.0 ND ND ND <br /> MW-2/11-24-92 ND ND ND ND ND ND <br /> MW-2/6-21-93 ND ND ND ND ND ND <br /> MW-3/11-24-92t ND 140 ND ND ND ND <br /> MW-3/1-22-93* NA ND NA NA NA NA <br /> MW-3/6-21-93 ND ND ND ND ND ND <br /> MW-4/6-21-93 ND ND 0.9 ND ND ND <br /> MW-4/10-8-93 ND ND 1.2 0.30 ND ND <br /> MW-4/2-9-94 ND ND 1.7 ND ND ND <br /> MW-5/6-21-93 ND ND ND ND ND ND <br /> MW-5/10-8-93 ND ND ND ND ND ND <br /> MW-5/2-9-94 ND ND ND ND ND �LND <br /> I I I j <br /> t Diesel result determined to be from laboratory labelling error <br /> Well resampled <br /> as ala'MTUPT NPI.ADD <br />