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' Bla9S Environmental Management Inc 1st Qtr 2005 Groundwater Monitoring Report 002-70950-04 U-Haul#709-50 groundwater gradient map was not generated for the "C" honzon since all screened intervals in the "C" ' wells were submerged In addition to water level depths, Blaes Environmental also measured dissolved oxygen (DO) levels in all well casings prior to and dunng purging activities using a YSI-85 DO meter The method for measuring DO content of groundwater is descnbed in Appendix B ' 3 2 GROUNDWATER SAMPLING--MARCH 2005 On March 15 and 16, 2004, Blaes Environmental collected 22 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 first quarter of 2005, groundwater levels were below the well screen and did not allow for sampling of any of U-Haul's "A"casing wells ' Groundwater sample collection involved purging approximately three well volumes of groundwater from each casing and allowing the groundwater to recharge to 90% of its original level prior to sample collection Purging was performed during this event with a 15-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®), 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—March 2005 Following purging, groundwater samples were collected from U-Haul's on-site and off-site groundwater wells using a new polyethylene disposable bailer for each well Pnor to sample collection, the depth to groundwater was measured to confirm that the groundwater level had recovered to within 90% of its ' onginal 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 descnbed in ' Appendix B Groundwater samples collected from the site were contained in appropnate sample bottles supplied by Sequoia Analytical Following collection, the groundwater samples were placed on ice and 6