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2.0 GROUNDWATER MONITORING PROGRAM 2 1 Groundwater Elevation Measurements and Evaluation of Data On March 23, 1999, Blaes Environmental measured the depth to groundwater in eight existing groundwater monitoring wells Groundwater levels were measured from the top of the monitoring well casing to the groundwater surface, and were measured to the nearest 0 01 foot using an electric water level sounder Using the elevation of the well casing, Blaes Environmental calculated the elevation of groundwater in each well The data was recorded in the operation and maintenance Iogbook for U-Haul Facility #709-50 and is presented in Table 1 Groundwater depth measurements were performed in accordance with Blaes Environmental's groundwater monitoring procedures presented in Appendix A Groundwater depths recorded on March 23, 1999 ranged from 36 50 feet to 39 35 feet below ground surface (bgs) These measurements corresponded to groundwater elevations ranging from 17 60 to 18 02 feet below mean sea level Please note the groundwater depth measurements indicate that groundwater is above the screened interval in each groundwater monitoring well The groundwater elevation data was used to create a groundwater conditions map showing the groundwater flow direction across the site The average groundwater flow direction as of March 23, 1999 was toward the southwest with a approximated hydraulic gradient of 0 002 feet/foot(Figure 2) 2.2 Groundwater Sampling and Analysis On March 24, 1999, eight groundwater monitoring wells (MW-1 through MW-8) were sampled by Blaes Environmental Prior to sampling, Blaes Environmental purged approximately three well volumes of groundwater were from seven of the eight monitoring well and confirmed that the groundwater level had recovered to within 90% of its original level A summary of the field parameters recorded during purging procedures is presented in Table 2 A description of the purgingprocedure is included in Appendix A P PP Purged groundwater was containerized on site in 55-gallon steel drums pending profiling P and disposal Empty drums used during a previous sampling had been left on site and were re-used during this sampling event A total of six drums were used to contain purge water at the site The purged groundwater will be removed following the second quarter 1999 sampling event i 2