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Blaes Entruonmental ttlairagenreltl Gac U Hau]#709-50 002-70950-04 Groundwater Monitoring Report 03/27/02 30 GROUNDWATER IN'[ONITORING PROGRAiN[ The groundwater monitoring program discussed below included one monitoring event conducted in March 2002 The measurement and sampling methods employed during the groundwater monitoring event are discussed in the following sections 31 GROUNDWATER MEASUREMENTS— MARCH 2002 On March 4, 2002, Blaes Environmental measured the depth to groundwater to 16 of the 23 groundwater monitor well casings associated with the site The upper "A" casings did not contain water and thus were not measured In the middle "B" and lower "C" well casings groundwater levels 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 0 01-foot using a Heron electric water level sounder The water level depth and time of measurement were recorded on a standard field data sheet The field data sheet is included in Appendix A and the data is presented to Table 2 Groundwater depth measurements were performed in accordance with Blaes Environmental groundwater monitoring procedures presented in Appendix B Groundwater depths recorded on March 4, 2002 ranged from 47 56 feet below top of casing (BTOC) in well MW-7C to 50 62 feet BTOC in well MW-6C Groundwater elevations ranged from 29 93 feet below mean sea level in well MW-6B to 30 16 feet below mean sea level in wells MW-IC and MW-2C (Table 2) No free-phase hydrocarbons were observed during collection of groundwater level measurements Other observations collected during groundwater monitoring activities are presented on the field data sheet included in Appendix A The data from the middle "B" and lower "C" well casings were used to create groundwater condition maps showing the groundwater flow direction across the site On March 4, 2002, the average groundwater flow direction using data from the middle `B" well casings was easterly (Figure 3) The groundwater flow direction of water in the lower "C" well casings was generally toward the east with a relative low at wells MW-1C, MW-2C, and MW-5C (Figure 4) Note that the groundwater gradient is nearly flat across the site and determining a distinct groundwater flow direction is difficult . 5