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Mr Mike Infuma <br /> Page 3 <br /> • 1 & ppb in MW1D and MW5 to 1,700 ppb in MW1 MTBE was reported in the samples <br /> collected from wells MW6 and UH7 at low concentrations of 2 0 ppb and 1 3 ppb, respectively <br /> TBA was detected in samples collected from wells MW3 and MW6, at concentrations of 23 ppb <br /> and 14 ppb, respectively 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 1D have shown a dramatic decrease from <br /> previous monitoring events TPHg, ethylbenzene and xylenes have been non-detect in MW 1D <br /> for four consecutive sampling events Benzene and toluene were also non-detect in MW1D 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 MW1D at a concentration of 1 S ppb <br /> The next groundwater sampling event is scheduled for September, 2005 If you have any <br /> questions or comments please contact Ground Zero at your convenience <br /> Respectfully, <br /> • Grj <br /> ound Z1ero Analysis, Inc <br /> .C, ( <br /> Joseph L Vasquez, ZO <br /> Staff Geologist �<v�' Hifi <br /> GR STAHL <br /> Gregory P Stahl, RG 5023 No. 5423 <br /> CA Certified Hydrogeologist No 264 <br /> DF GL <br /> Attachments <br /> cc Mr and Mrs John Ferranolo <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 /> 0 1GROUNDZEIHARRYS\Rcports\QMRUW512QM2005a doc <br />