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CALIFORNIA WATER LAP <br /> QUALITY ASSURMCEIQUALiTY weNTROL <br /> MANAGEMENT SUMMARY <br /> {Cadtir�casd� <br /> so that any procedure performed can be reconstructed from supporting <br /> documenta-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 documented with the code,date,preparation codes of reagents <br /> or standards used, volume prepared. preparer's name, standardization date, actual <br /> concentration. restandardlzation or expiration date, and any comments pertaining to <br /> the preparation. <br /> Equipment Maintenance <br /> " All equipment and instrumentation used in an analysis must be properly main- <br /> tained and verlRed. Specific procedures for preventive maintenance are outlined for <br /> an major analytical instna mentation. A laboratory logbook is kept with each <br /> instrument, and all routine maintenance is recorded. Copies of work rendered under <br /> service contracts are kept in a file. Balances are verified dally and before use with Class <br /> p weights. The Class P working weights are verified against NBS Class S weights on <br /> a monthly basis. Class S weights are sent for verification yearly. Analytical balances <br /> are serviced and calibrated by a certified technician on a yearly basis unless there is <br /> a problem. A delivery check is performed monthly on fixed-volume pipets. The <br /> temperatures of all storage refrigerator/freezers, incubators, ovens, fi faces, and <br /> rater baths are monitored daily. Working thermometers are verifled against an NBS <br /> thermometer every six months. Meters for pli and conductivity are calibrated daily <br /> and before use. Conductivity on the de-ionized water is measured. and the systems <br /> physically examined.on a daily basis.To prevent laboratory contamination,fume hood <br /> velocities are measured monthly. The autoclave is cleaned weekly. with the ldlet <br /> ampule test and cycle tuning performed monthly. All other laboratory equipment is <br /> maintained according to the manufacturers s specifications. Procedures for the <br /> '- washing 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 APP320PRlATE <br /> LOGBOOK OR ON A DAIA SHEET AFFIXED TO THE EQUIPMENT. <br /> QUAUTY CONTROL <br /> Quality assurance consists of devrJoping 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 /> strategy. Unless a particular method requires more stringent procedures. CWL 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 every twelve hours. <br /> 4 <br />