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Blaes Envaaonmental Management Inc U-haul-4709 50 002-70950-04 2"'Qtr 2003 Groundwater Monitoring Report 6127103 3 0 GROUNDWATER MONITORING PROGRAM The groundwater monitoring program discussed below includes one monitoring event conducted in May 2003 At the request of SJCEHD, this groundwater monitoring event was coordinated with Ground Zero Analysis (GZA), the consultant for the Former Harry's Auto Mart site located southeast of the U-Haul facility The measurement and sampling methods employed throughout the groundwater monitoring event are discussed in the following sections 3 1 GROUNDWATER MEASUREMENTS —MAY 2003 On May 5, 2003, Blaes Environmental measured the depth to groundwater in 22 of the 29 groundwater monitor well casings associated with the site The "A" casings did not contain water and thus were not measured Groundwater levels in the "B" and "C" well casings were measured from a surveyed point on the top of the monitoring well casing to the groundwater surface All water levels were measured to the nearest hundredth of a foot(0 01 ft)using a Heron electronic water-level sounder The water level depth and time of measurement were recorded on a standard field data sheet The field data sheets for this r monitoring event are included in Appendix A and tabulated with previous monitoring data in Table 2 Groundwater depth measurements were performed in accordance with Blaes Environmental groundwater monitoring procedures presented in Appendix B r Groundwater depths recorded on May 5, 2003, ranged from approximately 49 14 feet below top of casing (btoc) in well MW-7C to approximately 52 15 feet btoc in well MW-6C Groundwater elevations ranged from approximately 31 24 feet below mean sea level in wells MW-8C to approximately 31 54 feet below 1 mean sea level in well MW-5C (Table 2) Monitor well MW-3B contained approximately 0 16 feet of free-phase hydrocarbons and was therefore not sampled during this sampling event Other observations collected during groundwater monitoring activities are presented on the field data sheet included in Appendix A • 6