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' Blaes Environmental Management Inc 2nd Qtr 2005 Groundwater Monitoring Report 002-70950-04 U-Haul#709-50 elevated groundwater levels The average groundwater flow direction across the U-Haul site using the June 13, 2005 data from the selected U-Haul "B" well casings appears to be radiating toward the north at ian average gradient of 0 001 feet per foot across the site (Figure 3) A groundwater gradient map was not generated for the"C"horizon as 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 during purging activities using a YSI-85 DO meter The method for measuring DO content of groundwater is described in Appendix B 3 2 GROUNDWATER SAMPLING—JUNE 2005 iOn June 14 and 15, 2005, 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 (Figure 4) During the second 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 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(ID), 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—June 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 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 described in 1 6 i