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' 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 which <br /> require amber vials. <br /> ' (ix) General sample processing and treatment instructions follow. <br /> Filtered samples for TDS are collected in 250-mL polyethylene bottles <br /> ' and 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 <br /> obtain a pH of less than 2, and immediately placed on ice. <br /> Filtered samples for anions are collected in 250-mL polyethylene <br /> bottles and immediately placed on ice. <br /> Filtered samples for nitrogen, ammonia, and phosphate are collected <br /> in 500-mL polyethylene bottles, acidified with sulfuric acid to a pH of <br /> less than 2, and immediately placed on ice. <br /> Unfiltered samples for total coliform are collected in 125-mL plastic <br /> bottles 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 <br /> t glass vials supplied by the lab and pretreated with sodium thiosulfate. <br /> Vials are filled to the rim with no air bubbles present when sealed. <br /> (x) Field personnel shall collect ten percent of the total samples for quality <br /> assurance purposes (duplicate and field blank samples). Duplicate <br /> samples are collected and processed in the field and analyzed to evaluate <br /> ' the heterogeneity of the matrices. The duplicate samples are submitted to <br /> the laboratory with dummy site identifiers. Field blank samples are <br /> processed in the field identically as the other samples using de-ionized <br /> water as sample water. The field blank samples are submitted to the <br /> laboratory with dummy site identifiers <br /> (xi) All samples are to be promptly delivered to the analytical laboratory under <br /> standard chain-of-custody control for analysis within the prescribed <br /> holding times. <br /> D-6 - <br />