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Blass Environmental Management Inc 3rd Qtr 2005 Groundwater Momtonng Report <br /> 002-70950-06 U-Haul#709-50 <br /> r3 0 GROUNDWATER MONITORING PROGRAM <br /> The groundwater monitoring program discussed below includes one monitoring event conducted in <br /> August 2005 At the request of SJCEHD, this groundwater monitoring event was coordinated with <br /> Ground Zero Analysis (GZA), the consultant for the Former Harry's Auto Mart site located southeast of <br /> the U-Haul facility The measurement and sampling methods employed throughout the groundwater <br /> monitoring event are discussed in the following sections <br /> 3 1 GROUNDWATER MEASUREMENTS--AUGUST 2005 <br /> On August 29, 2005, BIaes Environmental measured the depth to groundwater in the 19 groundwater <br /> imonitoring wells (29 well casings) associated with the U-Haul site Groundwater levels in the well <br /> casings were measured from a surveyed point on the top of the monitoring well casing to the groundwater <br /> surface All water levels were measured to the nearest hundredth of a foot (0 01 ft) using a Heron <br /> electronic water-level sounder The water level depth and time of measurement were recorded on a <br /> standard field data sheet The held data sheets for this monitoring event are included as Appendix A and <br /> water levels are tabulated with previous monitoring data in Table 2 Groundwater depth measurements <br /> were performed in accordance with Blaes Environmental groundwater monitoring procedures presented <br /> as Appendix B <br /> Groundwater depths recorded on August 29, 2005 ranged from approximately 56 88 feet below top of <br /> casing (btoc) in well MW-7C to approximately 60 41 feet btoc in well MW-6C Groundwater elevations <br /> ranged MW- <br /> 7C from approximately 39 19 feet below mean sea level in well MW 7C to approximately 40 09 feet <br /> below mean sea level in well MW-313 (Table 2) Other observations collected during groundwater <br /> monitoring activities are presented on the field data sheet included in Appendix A <br /> Groundwater measurements from U-Haul's "B" well casings were used to derive a groundwater gradient <br /> map illustrating groundwater conditions at the site (Figure 3) The average groundwater flow direction <br /> across the U-Haul site using the August 29, 2005 data from the selected U-Haul "B"well casings appears <br /> ' to be toward the north/northwest at an average gradient of 0 002 feet per foot across the site (Figure 3) <br /> 5 <br />