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3 <br /> responsible custodian will complete the COC, file a copy, and send a copy to the PM for <br /> record keeping. <br /> U <br /> Pre-Analysis Storage/Preservation <br /> 4� <br /> The analytical laboratory will employ sample storage and preservation procedures appropriate <br /> r for the sample matrix. The procedures will 1) retard biological activity, 2) retard hydrolysis <br /> of chemical compound and complexes, 3) reduce volatility of constituents, and 4) reduce <br /> adsorption effects. General preservation methods include Ph control, chemical addition, <br /> refrigeration, and freezing. <br /> Post-Analysis Storage. <br /> Following sample analysis, the laboratory will maintain the samples in the appropriate <br /> storage for a minimum of 30 days, unless the PM makes prior arrangements with the lab. <br /> B.2 Calibration Procedures'and Frequency <br /> In general, laboratory and field measuring and testing equipment must be calibrated regularly <br /> i <br /> and the calibration information must be recorded in appropriate logs. If the equipment is not <br /> continuously in use, however, calibration will occur on an "as needed" basis prior to use, <br /> i <br /> and then at the required frequencies for as long as it is in use. <br /> Scheduled periodic calibration of testing equipment will not relieve field or laboratory <br /> personnel of the responsibility to employ properly functioning equipment. If equipment is j <br /> suspected of malfunctioning, the device will be appropriately flagged and removed from <br /> service so that the questionable equipment is not inadvertently used. The Laboratory <br /> � <br /> Coordinator or the PM, as appropriate, must be notified so that the device can be <br /> 809-001.wkp/03-06-97/u/keydata/workpian B-5 <br /> Terramext <br /> i <br />