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Rhes Enwronmental Management Inc 3rd Qtr 2004 Groundwater Monitonng Report 002-70950-04 U-Haul#709-50 1 . Wells at the site are now screened across three depth intervals These depth intervals include the "lower" (C) well casings, screened at depths ranging from approximately 60 to 100 feet below ground surface (bgs), the "middle" (B) well casings, screened at depths ranging from approximately 45 to 77 feet bgs, and the "upper" (A) well casings, screened at depths ranging from approximately 23 to 62 feet bgs These screened intervals accommodate fluctuations in groundwater depth that have ranged from approximately 45 to 90 feet bgs since 1993 (SOTA, 1997) Monitor well construction information is summarized in Table 1 ' On April 8 - 10, 2002, Blaes Environmental installed three additional wells at the site These wells included two remedial test wells (ASW-1 and VEW-112) and a groundwater monitoring well (MW-10) (Figure 2) Blaes Environmental installed an additional two groundwater monitor wells (MW-11 and ' MW-12) on March 17 and 18, 2003 These wells are located to the east and west of the site (Figure 2), and were installed at the request of the SJCEHD to better evaluate the extent of hydrocarbon impact to groundwater at the site Monitor wells MW-11 and MW-12 each include two well casings screened according to the "B"and "C" horizons as described in Section 2 3 of this report Is2 4 DOMESTIC WELL LOCATED AT FRONTIER MOTEL During well installation activities on March 17 and 18, 2003, a SJCEHD representative discovered an unregistered domestic well at the Frontier Motel located adjacent to the U-Haul property at 2639 North Wilson Way The SJCEHD representative requested Blaes Environmental collect samples from the motel's domestic well as part of the upcoming groundwater monitoring event The sample was collected on March 26,2003 �{ Laboratory analytical results received on April 14, 2003 indicated concentrations of 1,2-Dichloroethane T - (1,2 DCA) were detected at 13 parts per billion (ppb) in the sample collected from Frontier Motel's Domestic Well Blaes Environmental immediately notified SJCEHD of the analytical results and collected a confirmation sample on April 15, 2003 Laboratory analytical results received on April 17, 2003, confxnned a detection of 1,2 DCA at a concentration of 13 ppb Since both domestic well sample results exceeded the Maximum Contaminant Level (MCL) for drinking water of 0 5 ppb for 1,2 DCA, Blaes Environmental, on behalf of U-Haul, isolated the domestic well at Frontier Motel on April 18, 4