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BIa9S Environmental Management Inc U-Haul#709-50 002-70950-04 Groundwater Monitoring Report 5/30103 3 0 GROUNDWATER MONITORING PROGRAM The groundwater monitoring program discussed below includes one monitoring event conducted in March 2003 The measurement and sampling methods employed throughout the groundwater ' monitoring event are discussed in the following sections 3 1 GROUNDWATER MEASUREMENTS—MARCH 2003 On March 24, 2003, Blaes Environmental measured the depth to groundwater in 22 of the 29 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 to of the monitoring well casing to the groundwater surface All water levels P g g 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 March 4, 2003, ranged from approximately 50 25 feet below top of ' casing (btoc)in well MW-7C to approximately 53 32 feet btoc in well MW-6C Groundwater elevations ranged from approximately 32 38 feet below mean sea level in wells MW-4C and MW-8C to approximately 32 83 feet below mean sea level in well MW-7C (Table 2) Monitor well MW-313 contained approximately 0 09 feet of free-phase hydrocarbons and was thus not sampled during this sampling event Other observations collected during groundwater monitoring activities are presented on the field data sheet included in Appendix A 1 6