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Mr Mike Infurna <br /> Page 3 <br /> MW3 and MW7 1,2-DCA was present in each of the other wells at concentrations ranging from <br /> 1 8 ppb in MW1D to 1,100 ppb in MW1 MTBE was reported in the samples collected from <br /> wells MW6 and UH7 at low concentrations of 1 0 ppb and 0 7 ppb, respectively TBA was only <br /> detected in MW3, at a concentration of 23 ppb TBA was detected in MW3 for the first time <br /> since March 2003 No other oxygenates or additives were detected Analytical results for <br /> oxygenates and additives are summarized in Table 3 Attachment B contains laboratory reports and <br /> chain of custody documentation <br /> SUMMARY <br /> All site monitoring wells were sampled Concentrations of petroleum hydrocarbons in the <br /> shallow, onsite monitoring wells were similar to those recorded in the past However, <br /> concentrations of TPHg and BTEX in deep well MW 1 D have shown a dramatic decrease from <br /> previous monitoring events TPHg, ethylbenzene and xylenes have been non-detect in MW 1 D <br /> for three consecutive sampling events Benzene and toluene were also non-detect in MW 1 D this <br /> sampling event 1,2-DCA was detected in all A and B Zone wells except for wells MW3 and <br /> MW7 1,2-DCA was detected in the deep well MW11) at a concentration of 1 8 ppb <br /> The next groundwater sampling event is scheduled for June, 2005 If you have any questions or <br /> comments please contact Ground Zero at your convenience <br /> Respectfully, <br /> Ground Zero Analysis, Inc <br /> Joseph L Vasquez, <br /> Staff Geologist <br /> GREGORY P. <br /> STAB � <br /> Gregory P Stahl, RG 5023 * No. 5023 <br /> CA Certified Hydrogeologist No 264 <br /> Attachments <br /> cc Mr and Mrs John Ferraiolo <br /> Mr Jeff Greenberg, Esq <br /> Mr James L L Barton, CA Regional Water Quality Control Board <br /> Ms Marla Nahorn, Environmental Closures <br /> Mr Steve Woodhull, Blaes Environmental <br /> • <br /> G 1GROUNIDZE\HARRYSIReports\QMR1200511QM2005a doc <br />