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ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> Revised March 1998 <br /> of its initial elevation. Where water level recovery is slow, the sample will be collected after <br /> stabilization is achieved and enough water is present to fill sample containers. <br /> Cross contamination from transferring pumps (or bailers) from well to well will be avoided by <br /> utilizing dedicated equipment. Where this is not feasible, thorough cleaning of equipment will be <br /> performed between sampling rounds. Sampling will proceed from the least contaminated to the <br /> most contaminated well, if information is available before sample collection, or if it is indicated <br /> by field evidence. Where several types of analysis will be performed for a given well, individual <br /> samples will be 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 /> 7. Total Metals <br /> 8. Dissolved Metals <br /> 9. Phenols <br /> 10. Cyanide <br /> The specific analytical methods be utilized for the common volatilelsemivolatile to analyses are <br /> shown on Table 2. <br /> Groundwater samples will be collected with a teflon bailer with bottom emptying device. <br /> Duplicate samples will be transferred to vials or containers that meet Regional Board <br /> specifications (Table 1). Groundwater from the bailer will be transferred to the sample container <br /> by allowing the fluid to flow slowly along the sides of the vessel. All containers will be filled <br /> above the top of the opening to form a positive meniscus. No headspace should be present in the <br /> W:\Admin\SheIls\QAQC-98.D0C <br /> 14 <br />