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B1208 Environmental Management Inc 3rd Qtr 2004 Groundwater Mon:tonng Report 002-70950-04 U-Haul#709-50 1 , ' 3 0 GROUNDWATER MONITORING PROGRAM The groundwater monitoring program discussed below includes one monitoring event conducted in August 2004 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--AUGUST 2004 On August 30, 2004, Blaes Environmental measured the depth to groundwater in the 19 groundwater monitoring wells (29 well casings) associated with the U-Haul site Groundwater levels in the 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 monitoring event are included as Appendix A and tabulated with previous monitoring data in Table 2 Groundwater depth measurements were performed rin accordance with Blaes Environmental groundwater monitoring procedures presented as Appendix B Groundwater depths recorded on August 30, 2004 ranged from approximately 6175 feet below top of casing (btoc) in well MW-7C to approximately 65 47 feet btoc in well MW-3C Groundwater elevations ranged from approximately 44 06 feet below mean sea level in well MW-7C to approximately 45 31 feet below mean sea level_in_well--MW-3C (Table 2) Other observations collected during groundwater----- monitoring roundwater_W_-monitoring activities are presented on the field data sheet included in Appendix A r Groundwater measurements from U-Haul's "B" well casings, In addition to groundwater measurements provided by GZA for the Former Harry's Auto Mart monitoring wells, were used to derive a groundwater gradient map illustrating groundwater conditions at both sites The average groundwater flow direction across the U-Haul site using the August 30, 2004 data from the U-Haul "B" well casings appears to be relatively flat across the northern half of the site, and toward the southeast at an average gradient of 0 001 r 6 r