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CALIFORNIA WATER LADS <br /> QUALITY ASSURANCEQUALITY CONTROL <br /> MANAGE UEUT SUTl VARY <br /> (CondnuoM <br /> so that any procedure performed can be r=mtructed from supporting documenta- <br /> tion,with an accurate audit trail to their source. CWL utilizes a process for the tracking <br /> of all reagents. standards. and preparations. Information that is documented for <br /> reagents and'as-is standards'includes the code number.Item name.manufacturer, <br /> lot number, concentration. by whom it was opened.and the date emptied. Prepara- <br /> tions and standards are doczunented with the code,date,preparation codes of reagents <br /> or standards used, vohme prepared, preparees name. standardization date, actual <br /> concentration.restandardization or expiration date,and any comments pertaining to <br /> the preparation. <br /> Equlprnent Ma[nlenonce <br /> All equipment and instrumentation used in an analysis must be properly main- <br /> tained and verilled. Specific procedures for preventive maintenance are outlined for <br /> an major analytical Instrumentation. A laboratory logbook is kept with each <br /> imtrument, and all routine maintenance Is recorded. Copies ofwork rendered under <br /> service contracts are kept in a file. Balances are verified dally and before use with Class <br /> g weiglxts. The Class P working weights are verified against NBS Class S welghts on <br /> a monthly basis. Class S weights are sent for verification yearly. Analytical balances <br /> are serviced and calibrated by a cestitled technician on a yearly basis unless there is <br /> a problem. A delisesy check is performed monthly on ilxed-volume pipets. The <br /> temperatuses of all storage refrigerator/freezers. incubators. ovens, furnaces, and <br /> vMter baths are monitored daily. Working thermometers are verified against an NBS <br /> thermometer every six months. Meters for pli and conductivity are calibrated daily <br /> and before use. Conductivity r.n the de-Ionized water Is measured, and the systems . <br /> physically examined on a daily basLs.To prevent laboratory contamination.fume hood <br /> velocities are measured monthly. The autoelavt Is cleaned weekly. with the fMet <br /> ampule test and cycle timing performed monthly. AD other laboratory equipment is <br /> maintained according to the manufacturers's specMcations. Procedures for the <br /> 0 %-aching of laboratory glassware differ from lab to lab and are posted in the applicable <br /> areas. <br /> ALL OF THE ABOVE PROCEDURES ARE DOCUMENTED IN THE APPPOPRLATE <br /> LOGBOOK OR ON A DAXA SHEET AFMED TO niE EQUIPMENT. <br /> QUAL11Y CONTROL <br /> Quality assurance consists of developing and implementing a quality strategy for <br /> lab operations, personnel procedures, and documentation. Quality control, on the <br /> other hand.is the specific tactic to ensure that procedures for analysis follow the desire <br /> g strategy. Unless a particular method requires more stringent procedures,C%VL follows <br /> • these guidelines: <br /> Method Blanks <br /> Method blanks are prepared and analyzed for every 20 samples or one per batch. <br /> whichever is most frequent. Samples associated with method blanks not meeting <br /> laboratory standards must be reprepared and reanalyzed. Method blanks for volatile <br /> organics are analyzed eery twelve hours. <br /> 4 <br />