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17. <br /> ' from the time they are received until the sample is exhausted or returned <br /> ' to the custodian. <br /> When sample analyses and necessary QA checks have been completed in the <br /> ' laboratory, the unused portion of the sample will be disposed of properly. <br /> All data sheets and laboratory records are retained as part of the <br /> 1 permanent documentation. <br /> 4.3 Field Observation$gnd DocuMentaj;Jon <br /> General observations of climate and site conditions, and any other factors <br /> affecting the collected sample will be recorded in the field notebook. The <br /> field notebook will be maintained by the field team leader to provide a <br /> daily record of significant events, observations, personnel present, site <br /> conditions, excavation procedures, sampling procedures, and calibration <br /> ' records. <br /> ' 4.4 DeContamin4tion Procedures <br /> Any other sampling equipment will be washed in detergent water, followed by <br /> a clean water rinse, a distilled water rinse, and air dried. The backhoe <br /> utilized for excavation will be steam cleaned as necessary prior to leaving <br /> ' the site. <br /> 4.5 Analytical Procedure /Data RequiremenU <br /> ' In general , the laboratory will adhere to the recommendations promulgated <br /> in 21 CFR Part 58, "Good Laboratory Practices", and the criteria described <br /> ' in the U.S. EPA Test Methods for Evaluating Solid Wastes, SW846. <br /> Laboratory prepared clean glassware will be used for organic analyses. <br /> Plasticware will not be used because other organic compounds may be <br /> extracted by solvents and produce interfering peaks on the chromatograph. <br /> Canante E nv i r on menta l <br />