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ATC Associates Inc. Quality Assurance/Quality Control Plan Revised March 1998 material to be sampled unless otherwise specified by the lead regulatory agency. The samples will be composited by the state certified laboratory personnel prior to testing. 12.0 GROUNDWATER SAMPLING PROTOCOL Prior to arriving at the sampling site, all sampling equipment will be washed with nonphosphate detergent (Alconox or equivalent), and rinsed twice with tap water, once with acetone, and once with deionized water. this procedure will be carried out on-site before sampling of other monitoring wells, if more than one well is to be sampled with the sample sampling device. Immediately prior to sampling, the depth to water (DTW) in the well will be recorded: The thickness of product on top of the groundwater, if present, will be measured using an interface probe. The procedure for monitoring is presented in Section 9.0 (Groundwater Monitoring Protocol). If free product is detected, analysis of groundwater at the interface for dissolved product will not be conducted. A product sample will be collected for source identification. If all free product cannot be removed, an interval specific sampling device may be utilized to collect a sample from below the zone of free product. Before collecting groundwater samples from each well, the well will be purged until indicator parameters (temperature, conductivity, and pH) stabilize. This will entail the removal of at least four well casing volumes by bailing or pumping. The criteria for determining well casing volumes and temporary storage of purged water is outlined in Section 10.0 (Well Development Protocol). The indicator parameter measurements will be taken both before and after purging of each well casing volumes. Once the well is purged and indicator parameters have stabilized, a sample will be collected after the water level approaches 80 percent of its initial W:\Admin\SheHs\QAQC-98.DoC 13