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Attachment B <br /> Pre-Purging Checklist <br /> Decontaminate submersible pump(if not a dedicated pump). <br /> Decontaminate or replace discharge tubing(if not a dedicated pump). <br /> Calibrate field meters(pH,Eh,specific conductance,dissolved oxygen,HNu, <br /> etc.) <br /> Decontaminate water level indicator probe and tape. <br /> Unlock the monitoring well and measure vapor concentrations in accordance <br /> with the site specific Health and Safety Plan. <br /> Measure depth to water. <br /> Evaluate whether water table surface is above or within the screened interval. <br /> Calculate the volume of water in the well and borehole filter sand pack pore <br /> space(borehole volume). <br /> Insert dissolved oxygen probe into the monitoring well and measure the <br /> dissolved oxygen in the water column. If practical,also measure Eh of water in <br /> well. <br /> Install submersible pump into the well slowly to minimize aeration,placing the <br /> j pump intake within the screened interval or approximately 1 foot below the <br /> water level. <br /> If gasoline or diesel powered generators or compressors are used to operate the <br /> pump,take precautions to prevent the exhaust from contaminating the samples. <br /> Configure the discharge tubing with a gate valve and 3-way valve,with <br /> discharge directed through the 3-way valve and flow cell(optional),and into a <br /> calibrated decontaminated bucket(See Figure 1). <br /> STL265/002.W P5 <br /> SF010030987.DOC D-7 <br />