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� r <br />`b. <br /> :r <br /> Groundwater Samplincr Proms of <br /> Prion to arriving at the sampling site, all sampling equipment <br /> will be washed with laboratory grade detergent, and rinsed twice <br /> with tap water, once with acetone, and once with deianized water. <br /> The sample washing <br /> sampling of other monitoring wells,bIn such cases wherecarried out on- ite moreetha$ <br /> one monitoring well is to be sampled. n <br /> Immediately prior to sampling, the depth to water (DTW) level in <br /> the well will be recorded. The thickness of <br /> �.# product an top of <br /> the groundwater, if present, will be measured using <br /> er <br /> probe. The procedure for conducting these monitorings fare <br /> Presented in the Groundwater Monitoring Protocol attachment. <br /> i'' If free product is detected, analysis of <br /> dissolved product will be conducted after the tree nd oduc for <br /> p <br /> been removed from the well. If all free product cannot hbe <br /> ii removed, an interval specific sampling device will be utilized to <br /> collect a sample from below the zone of free product. Before <br /> • collecting at least two groundwater samples from each well, the <br /> _ well will be purged until indicator parameters <br /> conductivity and pH) stabilize. This will entail the(temperature <br /> rof <br /> at least four or more well casing volumes by bailing or pumping, <br /> The criteria for determining well casing volumes and storage of <br /> .-� purged waste is discussed in the WaterWork Well Develo gent <br /> Protocol Attachment. The indicator p <br /> be taken both before and afterpurgingameter measurements will <br /> ;1volume. Once the well is of each wall casing <br /> Purged and well water has stabilized, a <br /> sample will be collected after the water level approaches 80 <br /> Percent of its initial elevation. Where water level recovery is <br /> slow, the sample will be collected after stabilization is <br /> s achieved and enough water is <br /> present to fill sample containers. <br /> Fsa <br /> Cross contamination from transferring pumps (or bailers) from <br /> well to well will be avoided by utilizing dedicated equipment. <br /> �. <br /> Where this is not feasible thorough cleaning of equipment will be <br /> performed between sampling rounds. Sampling will <br /> the least contaminated to the most contaminated proceed well from <br /> information is available before sample collection, or if it is <br /> { ,.A indicated by field evidence. Where several <br /> will be performed for a given well <br /> individual sampiys�a <br /> Of <br /> collected in the following order: l s will <br /> !64 4 1. Volatile organics <br /> 2. Purgdable organic carbon <br /> S. Purgeable organic halogens <br /> f . 4. Total organic carbon <br /> .5. Total organic halogens <br /> + 6. Extractable organics <br /> na <br /> �r <br />