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,*Ago" <br /> MONITORING WELL DEVELOPMENT AND SAMPLING PROTOCOL <br /> A. Upon arriving at the sampling site, all sampling <br /> equipment will be washed in a solution of trisodium <br /> phosphate (TSP) , dishwashing soap, and water, and rinsed <br /> twice with tap water. This procedure will be carried out <br /> onsite before sampling other monitoring wells in cases <br /> where more than one monitoring well is to be sampled. <br /> B. Groundwater monitoring wells will be developed within 48 <br /> hours of completion. Approximately 10 times the volume <br /> of water in the casing will be withdrawn, if possible. <br /> If the aquifer is slow to recharge, development will <br /> continue until recharge is too slirw to practically <br /> continue. All withdrawn groundwater will be stored <br /> onsite in covered 55 gallon waste drums, unless <br /> permission is given by the appropriate regulatory <br /> agencies to discharge the groundwater to the ground <br /> surface or to the sewer. <br /> C. Groundwater sampling frequency will be determined as part <br /> of the Problem Assessment. Initial groundwater samples <br /> will be collected no sooner than 24 hours after well <br /> development. <br /> D. Immediately prior to sampling, the static water level <br /> (SWL) in the well casing will be recorded. The thickness <br /> of product, if present, floating on the groundwater <br /> surface will be measured using a tape with paste and an <br /> acrylic bailer. <br /> E. Approximately 3 times the volume of water in the well <br /> casing will be withdrawn immediately prior to sampling <br /> following the recording of the SWL. If the aquifer is <br /> slow to recharge, a smaller quantity of groundwater will <br /> be withdrawn in order to leave a sufficient volume of <br /> water in the well to sample. <br /> F. The groundwater sample is collected by inserting a teflon <br /> bailer to the bottom of the screened interval. <br /> Immediately after the bailer is removed from the well, a <br /> teflon sampling port is affixed to the bottom of the <br /> bailer. The sampling port is then opened to discharge <br /> the groundwater sample directly into the appropriate <br /> sample container. The sample container is filled <br /> completely full so that no headspace remains in the <br /> container. <br />