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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 fillr°sample containers. <br />Cross contamination from transferring pumps 1(or bailers) <br />from well to well will be avoidedby 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, df 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 />6. 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 <br />volatile/semivolatile 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 />