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Uri <br /> Grourdwater Sampling ?rotocol <br /> Prior to ar iring at the sampling site, all sampling equipment <br /> Ji-i be wasned .pith laboratory grade detergent, and rinsed twice <br /> tap water, once with acetone, and once lith deionized water <br /> "he sample gashing procedure will be carried out on-site before <br /> sampling of other monitoring wells, in such cases where more than <br /> one monitoring dell is to be sampled. <br /> Immediately prior to sampling, the death to dater (DT'W) level in <br /> the well will be recorded The thickness of product cn top of <br /> the groundwater, if present, will be measured using an interface <br /> probe. The procedure for conducting these monitorings are <br /> ~resented _n the Grounawater Monitoring Protecal attachment. <br /> If free product is detected, analysis of groundwater for <br /> : ssolved product will be conducted after the free product has <br /> peen removed from the well. if all free product cannot be <br /> 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 '_east two groundwater samples from each well„ the <br /> Yell will be purged until indicator parameters ( temperature, <br /> conductivity and pH) stabilize. This dill entail the removal of <br /> at least four or more well casing volumes by bailing or pumping. <br /> Tte criteria for determining well casing volumes and storage or <br /> purged waste is discussed in the Watemork well Development <br /> Protocol Attachment. The indicator parameter measurements will <br /> be taken both before and after purging of each well casing <br /> .volume. Once the well is purged and well dater has stanili.zed, a <br /> sample will oe collected after the water level approaches Sp <br /> norcent of its initial elevation. 'there water level recovery is <br /> -ilow, the sample will be collected after stabilization is <br /> m achieved and enough water is present to fill sample containers. <br /> Cross contamination from transferring pumps for bailers) from <br /> well to well will be avoided by utilizing dedicated equipment. <br /> ,There this is not feasible thorough cleaning of equipment will be <br /> performed between sampling rounds. Sampling will proceed from <br /> the least contaminated to the most contaminated well, if <br /> Lnformation is available before sample collection, or if it is <br /> indicated by field evidence. 'there several types of analysis <br /> will be performed for a given well individual samples will be <br /> collected in the following order: <br /> 1. Volatile organics <br /> _ 2. Purgeable organic carbon <br /> 3. Purgeable organic halogens <br /> 4. Total organic carbon <br /> 5. Total organic halogens <br /> 6. Extractable organics <br />