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Wails Environmental Management Inc U-HauIP709-50 002-70950 04 2"'Qtr 2003 Groundwater Monitoring Report 6127/03 . 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 surtace (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 F 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 groundwater monitoring wells at the site These wells included two remedial test wells (ASW-1 and VEW-1/2) and a groundwater monitoring well (MW-10) (Figure 2) The well construction diagrams for these wells were presented in the Blaes Environmental Second Quarter 2002 Groundwater Monitoring Program Report Blaes Environmental installed an additional two groundwater monitor wells (MW-11 and MW-12) on March 1 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 contamination 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 Well construction diagrams for these wells were presented in the Blaes Environmental First Quarter 2003 Groundwater Monitoring Program Report Cross Sections generated based on the drilling logs of select groundwater monitoring wells are presented in Figures 3 and 4 2 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 (1,2 DCA) were detected at 1 3 parts per billion (ppb) in the sample collected from Frontier Motel's 4 •