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1 <br /> �3 1 <br /> I, <br /> 3; I <br /> +t <br /> I� <br /> XIV. Good Laboratory Practices <br /> ii <br /> Good laboratory practices are followed to prevent contamination of <br /> samples and standards. This includes the caIreful cleaning of glassware, <br /> and the use of disposable labware and containers .when practical . <br /> The deionized water is monitored by an automIatic „shut-off valve (at a <br /> set resistance of 500,000 ohms) , checked monthly for pH, <br /> standard plate count, electrical conductivity, total dissolved solids , <br /> residual chlorine, and heavy metals (to include lead, cadmium, chromium, <br /> copper, nickel and zinc) . <br /> The analytical balances are certified once a year by a qualified <br /> specialist, and checked weekly using standard S weights. <br /> All refrigerator, oven, and incubator temperatures are monitored daily, <br /> and all thermometers are checked for accuracy on"a quarterly basis. <br /> Fumehood velocities are checked monthly and sash marks are adjusted if <br /> necessary according to CAL OSHA regulations: <br /> j; <br /> The phi meter is to be standardized on the day of use with two (2) buffer <br /> solutions (pH 4, 7 and/or 10) . <br /> meter is to be standardized once a month with <br /> The conductivity <br /> 0.01 N KCl solution. <br /> The turbidity meter is to be standardized w'th standards before use. <br /> Standards are replaced yearly and checked with EPA check samples or <br /> equivalent commercial check samples. <br /> The QA/QC Director must be notified immedialtely -if any sign of <br /> malfunction occurs in any instrument so that he can decide if a <br /> qualified serviceman should be consulted. <br /> In accordance with current regulations, haz3ardous materials are <br /> clearly labeled and Material Data Safety Sheets °are available for <br /> employee inspection. <br /> �I <br /> i <br /> i� <br /> I� <br /> C <br /> �i <br /> [i <br /> I <br /> it <br /> l <br /> i. <br /> -13- <br /> a <br />