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0I80S Enwronmenlnl Management Inc U Haul#709-50 <br /> 002-70950-04 Groundwater Monitoring Repots <br /> 01/23/03 <br /> The gradient in both B and C horizons was generally flat and the groundwater flow direction varied <br /> across the site <br /> In addition to water level depths, Blaes Environmental also measured dissolved oxygen levels from <br /> iselected well casings using a YSI-85 dissolved oxygen meter The method for measuring dissolved <br /> oxygen content of groundwater is described in Appendix B The results indicated that dissolved oxygen <br /> levels during this monitoring event ranged from 0 3% in wells MW-3B and MW-3C to 2 6% in well <br /> MW-2B (Table 2) <br /> i <br /> 3 2 GROUNDWATER SAMPLING—SEPTEMBER 2002 <br /> On September 24, 25, and 26, 2002, Blaes Environmental collected 14 groundwater samples from the on- <br /> site and off-sate monitoring wells that contained water This includes samples from the "B" and "C" <br /> casings only The current groundwater level did not allow for sampling of any of the "A"casing wells <br /> ' Groundwater sample collection involved purging approximately three well volumes of groundwater from <br /> each well and allowing the wells to recharge before sample collection Purging was performed during <br /> this event by hand bailing water from the "B" and pumping the "C" well casings Hand bailing was done <br /> by using a 1&718-inch diameter by 3 or 8-foot long bailer Pumping involved using a 2" Grundfos <br /> "Reda-flo" submersible pump The bailer and pump were decontaminated before and after purging each <br /> well with a liquid detergent wash (Alconox®), a tap water rinse, and a final rinse with de-ionized water <br /> iPeriodic parameter readings were recorded on the field data sheets included in Appendix A The <br /> groundwater purging procedures are presented in Appendix B Purge water was stored in a 1,000-gallon <br />' polyethylene tank located on the property,pending proper recycling and disposal <br />' 3 2 1 Groundwater Sample Collection—September 2002 <br /> Following purging, groundwater samples were collected from both on-site and off-site groundwater wells <br />' using a new polyethylene disposable bailer for each well Prior to sample collection, the depth to <br /> groundwater was measured to confirm that the groundwater level had recovered to within 90% of its <br /> original level <br /> 7 <br /> 1 <br />