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a <br /> ATC Associates Inc- <br />- Quality Assurance/Quality Control Plan !i <br /> Revised 1998 <br /> :t <br /> 'F <br /> i� <br /> and temporary storage of purged water is outlined in Section 100 (Well Development Protocol)- The <br /> indicator parameter measurements will be taken both before and after purging of each well casing <br /> volumes. Once the well is purged and indicator parameters have stabilized, a sample will be collected <br /> after the water level approaches 80 percent of its initial elevation''; Where water level recovery is slow, <br /> the sample will be collected after stabilization is achieved and enough..water is present to fill sample <br /> containers. <br /> J <br /> i <br /> Cross contamination from transferring pumps(or bailers) from well to well will be avoided by utilizing <br /> dedicated equipment. Where this is not feasible, thorough cleaning of equipment will be performed <br /> between sampling rounds. Sampling will proceed from the least contaminated to the most <br /> contaminated well, if information is available before sample collection, or if it is indicated by field <br /> evidence. Where several types of analysis will be performed for a given well, individual samples will be <br /> collected in the following order: ,l <br /> 1- Volatile Organics ! <br /> 2. Pgeab e u r 1 Organic Carbon !t <br /> 0 g c <br /> 3. Purgeable Organic Halogens ,1 <br />} 4. Total Organic Carbon <br /> S. Total Organic Halogens <br /> 6. Extractable Organics <br /> 7. Total Metals <br /> 8- Dissolved Metals <br /> 9. Phenols 'b <br /> 10. Cyanide <br /> The specific analytical methods be utilized for the common volatile/semivolatile to analyses are shown <br /> �a <br /> on Table 2. <br /> 5 <br /> 11 <br /> I1 <br /> �IF <br /> 13 <br /> .i <br />