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0 <br /> 6. When conditions allow, purge water shall be spread on land or the <br /> disposal area. Otherwise, purge water shall be collected in a tank or drum <br /> and transported for spreading at the nearest disposal field. <br /> ' 7. Following the collection of all other samples, the submersible pump shall <br /> be removed and the sample for total coliform analysis collected using a <br /> new disposable bailer. <br /> ' 8. Samples to be analyzed for dissolved constituents are filtered in the field <br /> using 0.45-pm capsule filters. The capsule filters are certified to meet EPA <br /> ' standards for trace metal analysis. Sample bottles and sampling <br /> equipment are rinsed thoroughly three times with the water to be sampled <br /> prior to sample collection. Bottles pretreated with preservatives are not <br /> rinsed prior to sample collection. Clear sample bottles and vials may be <br /> used for all constituents, with the exception of trihalomethanes, EDTA, <br /> and caffeine which require amber bottles. <br /> 9. General sample processing and treatment instructions follow. <br /> ' Filtered samples for TDS are collected in 250-mL polyethylene bottles and <br /> immediately placed on ice. <br /> ' Filtered samples for cations and metals are collected in 250-mL <br /> polyethylene bottles, acidified in the field with nitric acid added to obtain a <br /> pH of less than 2, and immediately placed on ice. <br /> ' Filtered samples for anions are collected in 250-mL polyethylene bottles <br /> and immediately placed on ice. <br /> Filtered samples for nitrogen, ammonia, and phosphate are collected in <br /> 500-mL polyethylene bottles, acidified with sulfuric acid to a pH of less <br /> ' than 2, and immediately placed on ice. <br /> Unfiltered samples for total coliform are collected in 125-mL plastic bottles <br /> containing a dechlorinating agent added by the laboratory and <br /> immediately placed on ice. <br /> Alkalinity is determined by the lab on unfiltered samples. The sample is <br /> collected in a 250-mL polyethylene bottle and placed on ice. <br /> Unfiltered samples for trihalomethanes are collected in 40 mL amber glass <br /> ' vials supplied by the lab and pretreated with sodium thiosulfate. Vials are <br /> filled to the rim with no air bubbles present when sealed. <br /> - 11 - <br /> 1 <br />