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Mr Mike Infurna Page 3 MW3, MW7 and MW1D 1,2-DCA was present in each of the other wells at concentrations ranging from 1 3 ppb in MW5 to 620 ppb in MW 1 MTBE was reported in the sample collected from well MW6 at 0 6 ppb TBA was detected in sample collected from well MW3 at a concentration of 12 ppb No other oxygenates or additives were detected Analytical results for oxygenates and additives are summarized in Table 3 Attachment B contains laboratory reports and chain of custody documentation SUMMARY All site monitoring wells, except UHMW7, were sampled Concentrations of petroleum hydrocarbons have notably decreased in many site wells In MW 1, TPHg, benzene, and toluene were all detected at the lowest levels to date in each respective well In MW4, benzene was non- detect for the first time since the wells installation, and in MW6 TPHg and BTEX compounds were non-detect for the first time since the wells installation Concentrations of TPHg and BTEX in deep well MW1D have shown a dramatic decrease from previous monitoring events TPHg, ethylbenzene and xylenes have been non-detect in MW1D for six consecutive sampling events Benzene and toluene were also non-detect in MW l D for the fourth consecutive event 1,2-DCA was not detected in the deep well MW 1 D for the first time since March 2004 The next groundwater sampling event is scheduled for March 2006 If you have any questions or comments please contact Ground Zero at your convenience • Respectfully, Ground Zero Analysis, Inc jvt- vo Joseph L Vasqu z, Staff Geologist /J a cooRlrP / * stun. --~— No sage Gregory P Stahl, PG 5023 �g CA Certified Hydrogeologist No 264 4F CAI]E Attachments cc Mr and Mrs John Ferraiolo Mr Jeff Greenberg, Esq Mr James L L Barton, CA Regional Water Quality Control Board Ms Marla Nahorn, Environmental Closures Mr Steve Woodhull, Blaes Environmental • G 1GROUNDZEIHARRYSIReporls\QMRU005\4QM2005a doc