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CALIFORNIA WATER LAP' ,.r QUALITY ASSURANCFIQUALITY 04TROL MANAGEMENT� SUMMARY Sample and Document Control It is essential that certain activities of the laboratory becarefullyrdi including scheduling of sampling activities, sample preparation and analysis requirements, and the tracking of samples from collection to disposal The Sample and Document Control Department is the key department responsible for interfacing with Field Sere and "yhcal personnel to insure the integrity of samples. documents, and data Procedures used by Sample and Document Control include: ❑ Chain-of Custody Document ❑ Laboratory ID and logging. Incoming samples are assigned an alphanu- meric lab ID number logged and tracked in accordance with regulatory guidelines ❑ Secure sample storage and preservation ❑ Correct identification of analysis requirements and preparation of labora- tory work sheets ❑ Maintenance of case files: One for each set of samples received, to contain all reports. data. bills of lading. telephone logs, chain-of-custody, tracking records, and all other documents pertaining to the samples Y ❑ Sample tracking The internal process of tracking samples from log-in to the final disposition and the facility security procedures of California.Water Labs meet the test of the most stringent chain-of-custody requirements ❑ Sample statusingr, To ensure that turnaround time requirements..progress milestones, and timely follow-up procedures are used on all samples O Sample retention_ Samples are held for 30 days following the completion of analysis unless other arrangements are made. Samples containing hazard- ous substances will be returned to the customer ❑ Records retention: All data relating to sample analysis is retained for a period of seven years Reagents, Standards, and Preparations All solvents. reagents, and gases used by CWL are of consistent analytical quality and known purity. Purity is continually monitored by analysis and comparison with newly prepared standards. All organic solvents are pesticide grade or equivalent. All reagents are reagent grade, ACS or equivalent. Gases are USP grade. These criteria are followed unless a sped4c methodology has different requirements. Materials subject to chemical change on prolonged exposure to ambient air— e.g.. oxidation, absorption. or loss of water—are never used as quantitative reagents without assay or standardization. CWL is responsible for the traceability of all reagents,standards,and preparations 3