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BIaeS hic U Haul4709-50 002-70950-04 Groundwater Monitoring Report 03127!02 • In addition to depth to water measurements, Blaes Environmental collected dissolved oxygen level measurements from selected well casings using a YSI-85 dissolved oxygen meter The Method of dissolved oxygen measurement collection is described in Appendix B Measutements indicated that dissolved oxygen levels in gioundwatei ranged from 3 3% in monitor well MW-4C to 35 9% in monitor well MW-3C (Table 2) 3 2 GROUNDWATER SAMPLING — MARCH 2002 On March 6, 2002, Blaes Environmental collected 16 groundwater samples from the on- and off-site monitoring wells that contained water This included samples from the middle"B" casings and lower"C" casings only The current groundwater level did not allow sample collection from any of the upper "A" casing wells Groundwater sample collection involved purging approximately three well volumes of groundwater from the wells and allowing the wells to equilibrate before sample collection Purging by hand bailing was used to purge water from the middle "B" and lower "C" well casings Purging by hand bailing involved the use of a 15-inch diameter by 6-foot long bailer The bailer was decontaminated before and after use using a liquid Alconox x detei gent wash, a tap water iinse, and a final rinse with deiontzed water Purge water was temporarily stored in 55-gallon steel drums and later transferred into the on-site polyethylene tank Periodic parameter readings were recorded on the field data sheets included in Appendix A More details of groundwater purging procedures are presented in Appendix B The purged groundwater contained in the on-site 1,000-gallon polyethylene tank is pending waste profiling and disposal/treatment Currently the tank is at 40% capacity (approximately 400 gallons) and Blaes Environmental is treating the water by aeration Discharge of the contained water is discussed in a letter report to the City of Stockton (Appendix Q 32 1 Groundwater Sample Collection— March 2002 Following purging, groundwater samples were collected from the on- and off-site groundwater wells using a new polyethylene disposable bailer 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 . 6