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casing volume. Once the well is purged and indicator <br /> parameters have stabilized, a sample will be collected after <br /> the water level approaches 80 percent of its initial <br /> ' elevation. where water level recovery is slow, the sample <br /> will be collected after stabilization is achieved and enough <br /> water is present to fill sample containers. <br /> ' Cross contamination from transferring pumps (or bailers) <br /> from well to well will be avoided by utilizing dedicated <br /> equipment. Where this is not feasible, thorough cleaning of <br /> equipment will be performed between sampling rounds. <br /> Sampling will proceed from the least contaminated to the <br /> most contaminated well, if information is available before <br /> sample collection, or if it is indicated by field evidence. <br /> ' Where several types of analysis will be performed for a <br /> given well, individual samples will be collected in the <br /> 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 /> S. Dissolved metals <br /> 9. Phenols <br /> 10. Cyanide <br /> The specific analytical methods be utilized for the common <br /> ' volatile/semivolattle to analyses are shown on Table 2. <br /> Groundwater samples will be collected with a teflon bailer <br /> with bottom emptying device. Duplicate samples will be <br /> ' transferred to vials or containers that meet Regional Board <br /> specifications (Table 1). Groundwater from the bailer will <br /> be transferred to the sample container by allowing the fluid <br /> to flow slowly along the sides of the vessel. All <br /> containers will be filled above the top of the opening to <br /> form a positive meniscus. No head space should be present <br /> ' in the sample container once it is sealed. After the vial is <br /> capped it will be inverted to check for air bubbles. If <br /> bubbles are present the sample will be discarded and <br /> replaced. If it is not possible to collect a sample without <br /> head space, the problem will be noted on the field <br /> technician' s sampling log. <br /> ' Immediately following sample collection, samples will be <br /> labeled and stored in an ice chest containing frozen <br /> chemical ice sealed in plastic bags. Sample labels will <br /> contain the following information: date, time, project ID, <br /> sample ID, name of sampler and type of analysis. All <br /> samples will be transported under chain-of-custody protocol <br /> to a state certified laboratory within 24 hours. A sample <br /> container filled in the laboratory with organic free water <br />