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ATC Associates Inc <br /> Quality Assurance/Quality Control Plan <br /> Revised 1998 <br /> and temporary storage of purged water is outlined in Section 10 0 (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 /> 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 contarnunated 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 <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 /> b 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 shown <br /> on Table 2 <br />