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' B13e5 E111"JoIllnenlal Managonenl Inc U ilaulg709 54 002 70950 04 Groundwater Monitonng Report 1/23/03 i ' 3 0 GROUNDWATER MONITORING PROGRAM The groundwater monitoring program discussed below includes one monitoring event conducted in December 2002 The measurement and sampling methods employed throughout the groundwater ' monitoring event are discussed in the following sections ' 3 1 GROUNDWATER MEASUREMENTS—DECEMBER 2002 On December 3, 2002, Blaes Environmental measured the depth to groundwater in 18 of the 25 ' 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 original field data sheets for this monitoring event are included in Appendix A and presented alongside ' . previous monitoring data in Table 2 Groundwater depth measurements were performed in accordance with Blaes Environmental groundwater monitoring procedures presented in Appendix B ' Groundwater depths recorded on December 3, 2002, ranged from approximately g pp ely 54 61 feet below top of ' casing (btoc) in well MW-7C to approximately 57 72 feet btoc in well MW-6C Groundwater elevations ranged from approximately 36 77 feet below mean sea level in well MW-8C to approximately 37 08 feet ' below mean sea level in wells MW-8A and MW-9B (Table 2) No free-phase hydrocarbons were observed in any of the wells during this groundwater sampling event Other observations collected ' during groundwater monitoring activities are presented on the field data sheet included in Appendix A ' The data from the "B" and "C" well casings were used to create groundwater condition maps showing the groundwater flow direction across the site On December 3, 2002, the average groundwater flow direction using data from the "B" well casings appears to be predominantly to the west across the site i (Figure 3) 1 • 5