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' Blaes Environmental Management Inc 2nd Qtr 2005 Groundwater Monrtonng Report <br /> 002-70950-04 U-Haul#709 50 <br /> • 3.0 GROUNDWATER MONITORING PROGRAM <br /> ' The groundwater monitoring program discussed below includes one monitoring event conducted in June <br /> 2005 At the request of SJCEHD, this groundwater monitoring event was coordinated with Ground Zero <br /> ' Analysis (GZA), the consultant for the Former Harry's Auto Mart site located southeast of the U-Haul <br /> facility The measurement and sampling methods employed throughout the groundwater monitoring <br /> ' event are discussed in the following sections <br /> ' 3 1 GROUNDWATER MEASUREMENTS—JUNE 2005 <br /> On June 13, 2005, Blaes Environmental measured the depth to groundwater in the 19 groundwater <br /> monitoring 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 field 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 June 13, 2005 ranged from approximately 48 48 feet below top of <br /> casing (btoc) in well MW-7C to approximately 51 56 feet btoc in well MW-6C Groundwater elevations <br /> ranged from approximately 30 59 feet below mean sea level in well MW-8C to approximately 31 09 feet <br /> below mean sea level in well MW-10B (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 select U-Haul "B" well casings were used to derive a groundwater <br /> gradient map illustrating groundwater conditions at the site (Figure 3) Groundwater elevation data from <br /> ' monitoring wells MW-4B, MW-8B, MW-1013, MW-11B, and MW-12B were used to generate the <br /> gradient map All other monitoring wells screened in the "B" had submerged well screens due to the <br /> 5 <br /> 1 <br />