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',yam <br /> f <br /> Certain analytical services which are requested on an <br /> infrequent basis are maintained at only one laboratory <br /> location. This allows us to support the required expertise <br /> at LhaL servic@ at a iuu.= t higtjar lavel Mian woulu otherwise <br /> be possible. Those services maintained in Pasadena are <br /> radiochemistry and treatability studies. Emeryville's <br /> exclusive services are ion chromatography and fish toxicity <br /> bioassays. <br /> C. Reagents and Supplies <br /> _ Reagent chemicals, purchased from reputable laboratory <br /> supply companies, are of ACS reagent grade or better. <br /> Calibration standards are either prepared in-house from <br /> high purity starting materials or purchased as standard <br /> concentrates. Commercial standards are certified by the <br /> supplier and are checked on receipt against the previous <br /> laboratory standard for the same materials. Carrier gases, <br /> solvents, acids and deionized water are checked on a <br /> I batchwise basis, In this way it is possible to avoid <br /> systematic contamination of samples without repeating a sec <br /> .` of samples as would be the case if we relied only on method <br /> blanks to detect such contamination. <br /> I <br /> IV-5 <br /> i <br />