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B[aes Environmental Management Inc 3rd Qtr 2004 Groundwater Momtonng Report 002-70950-04 U Haul#709-50 feet per foot across the southern half of the site(Figure 3) A groundwater gradient map was not generated for the "C"horizon since all screened intervals in the "C"wells were submerged hi addition to water level depths, Blaes Environmental also measured dissolved oxygen (DO) levels, electrical conductivity, salinity, and temperature from all well casings prior to and during purging activities using a YSI-85 DO meter The method for measuring DO content of groundwater is described in Appendix B Electrical conductivity, salinity, and temperature readings were collected during this ' event, but an equipment malfunction prevented the collection of dissolved oxygen levels 3 2 GROUNDWATER SAMPLING—AUGUST 2004 On August 31,2004, Blaes Environmental collected 17 groundwater samples from the on-site and off-site ' monitoring wells that contained water The groundwater levels at the site are subject to a wide range of seasonal fluctuation During the third quarter of 2004, groundwater levels were below the well screen Iand did not allow for sampling of any of U-Haul's "A" casing wells, as well as four of the "B" casing wells (MW-8B,MW-10-B, MW-11B, and MW-12B) Groundwater sample collection involved purging approximately three well volumes of groundwater from each well and allowing the wells to recharge before sample collection Purging was performed during this event with a 1 5-inch ProActive "Mini-Monsoon" 12-volt battery-operated groundwater pump The pump was decontaminated before and after purging each well with a liquid detergent wash (Liquinox ft and a tap-water rinse Periodic parameter readings were recorded on the field data sheets included in Appendix A The groundwater purging procedures are presented in Appendix B Purge water was stored in a 1,000-gallon polyethylene tank located on the property, pending proper recycling and disposal - 32 1 Groundwater Sample Collection—August 2004 Following purging, groundwater samples were collected from both U-Haul's on-site and off-site groundwater wells using a new polyethylene disposable bailer for each well Prior to sample collection, the depth to groundwater was measured to confirm that the groundwater level had recovered to within 90% of its original level The water level measurements, sample name, time, and container type were recorded on sample data sheets included in Appendix A Groundwater sampling procedures are 7