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• the well has been allowed stabilize for at <br /> least 24 hours after development or other <br /> withdrawal procedure . A sample should be <br /> collected that is indicative of the thickness <br /> of floating product within the monitoring <br /> well . This may be accomplished by the use of <br /> a clear acrylic bailer designed to collect a <br /> liquid sample where free product and ground <br /> water meet. Samples should be field <br /> inspected for the presence of odor and/or <br /> sheen In addition to the above evaluation. <br /> C. Dissolved product ( from a well) : If free <br /> product is detected, analysis of water for <br /> dissolved product should be conducted after <br /> the free product has been substantially <br /> removed from the well . Before ,collecting a <br /> water sample, a well should be purged until <br /> temperature, conductivity and pH stabilize . <br /> Often, this will require removal of four or <br /> more well volumes by bailing or pumping. <br /> Once well volumes are removed and well water <br /> is stabilized, a sample can be taken after <br /> the water level is sufficient for required <br /> sample volumes . Where water level recovery <br /> is slow, the sample can be collected after <br /> stabilization is achieved . <br /> d . Protocol for sampling of ground water is <br /> described in Section C "Sampling of <br /> Monitoring Wells by Pumping and Bailing. " <br /> e . Water samples should be collected in vials or <br /> containers specifically designed to prevent <br /> loss of volatile constituents from the <br /> sample . These vials should be provided by an <br /> analytical laboratory, and preferably, the <br /> laboratory conducting the analysis . No head- <br /> space should be present in the sample <br /> container once the container has been capped. <br /> f . Samples should be placed in an ice chest <br /> maintained at 4 degrees C with blue ice (care <br /> should be taken to prevent freezing of the <br /> water and bursting of the glass vial ) . <br /> E. Wipe Sampling <br /> Wipe sampling can help to provide a picture of <br /> contaminants that exist on the surface of drums, tanks, <br /> equipment or buildings on a hazardous waste site or <br /> that exist in the ones of a populace at risk . <br /> -12- <br />