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4 <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Pian <br /> Revised March 1998 <br /> elevation. Where water level recovery is slow, the sample will be collected after stabilization is <br /> 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 by <br /> 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 volatile/semivolatile to analyses are <br /> shown on Table 2. <br /> Groundwater samples will be collected with a teflon bailer with bottom emptying device. Duplicate <br /> samples will be transferred to vials or containers that meet Regional Board specifications (Table 1). <br /> Groundwater from the bailer will be transferred to the sample container by allowing the fluid to <br /> flow slowly along the sides of the vessel. All containers will be filled above the top of the opening <br /> W:1Admin\She11s1QAQG98.DOC <br /> 14 <br />