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Blaen Envcionmental Management Inc U-Haul#709-50 <br /> 002-70950-04 Groundwater Monitoring Report i <br /> 09/09/02 <br /> I.J , <br /> In addition to water level n depths, Blaes Environmental also measured dissolved oxygen levels from Yg <br /> selected well casings using a YSI-85 dissolved oxygen meter The method for measuring dissolved <br /> oxygen content of groundwater is described in Appendix C The results indicated that dissolved oxygen <br /> levels during this monitoring event ranged from 0% in wells MW-213 and MW-413 to 212% in well <br /> MW-1C (Table 2) <br /> 3 2 GROUNDWATER SAMPLING—JUNE 2002 ' <br /> On June 27, 2002, Blaes Environmental collected 19 groundwater samples from the on-site and off-site <br /> J . <br /> monitoring wells that contained water This includes samples from the "B" and "C" casings only The <br /> current groundwater level did not allow for sampling of any of the "A" casing wells l <br /> Groundwater sample collection involves purging approximately three well volumes of groundwater from <br /> Ieach well and allowing the wells to recharge before sample collection Purging was performed during <br /> i this event by hand bailing water from the "B" and pumping the "C"well casings Hand bailing involved <br /> using a 1 5-inch diameter by 6-foot long bailer Pumping involved using a 2" Grundfos "Reda-flo" <br /> jsubmersible pump The bailer and pump were decontaminated before and after purging each well with a i <br /> liquid detergent wash (Alconox ft a tap water rinse, and a final rinse with de-ionized water Periodic <br /> I 1 <br /> parameter readings were recorded on the field data sheets included in Appendix B More details of <br /> groundwater purging procedures are presented in Appendix C Purge water was temporarily stored in <br /> �J 55-gallon steel drums and later transferred into the on-site 1,000 gallon polyethylene tank <br /> 32 1 Groundwater Sam le Collection—June 2002 <br /> Following purging, groundwater samples were collected from the on- and off-site groundwater wells <br /> using a new polyethylene disposable bailer Prior to sample collection, the depth to groundwater was <br /> measured to confirm that the groundwater level had recovered to within 90% of its original level The <br /> water level measurements, sample name, time, and sample containers were recorded on sample data <br /> sheets included in Appendix B Details of groundwater sampling procedures are included in <br /> 1 Appendix C <br /> � I <br /> 6 <br />