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Clayton <br /> ENVIRONMENTAL <br /> CONSULTANTS <br /> Preservatives are not added to any sample, unless instructed. If requested, they are supplied by <br /> Clayton's laboratory. <br /> All sample containers are labeled in the field. Labels contain the following information: project <br /> name, sample identification number, project number, date and time of collection, and sampler's <br /> initials. <br /> Under no circumstances are sealed sample containers opened by anyone other than the laboratory <br /> personnel who perform the requested analyses. If it is necessary for samples or sample chests to <br /> leave the immediate control of the sampler prior to delivery to the laboratory, for example during <br /> shipment by an overnight shipper, a custody seal is placed on each sample container and/or <br /> sample chest to ensure that the samples have not been tampered with during transportation. The <br /> custody seal is signed by the sampler, and the date and time that the seal was placed is recorded. <br /> The elapsed time between sample collection and delivery to the laboratory never exceeds 48 <br /> hours. Water samples are not held for more than 14 days prior to analysis and are kept at 4°C at <br /> all times. <br /> To document and trace samples from time of collection, a signed chain-of-custody record is filled <br /> out by the sampler and accompanies the samples through the laboratory analyses. The completed <br /> chain-of-custody is included with the analytical report from the laboratory. <br /> REFERENCES <br /> Groundwater Monitoring Guidelines, Revised February 1990. Alameda County District <br /> Groundwater Protection Program. <br /> Leaking Underground Fuel Tank (LUFT) Field Manual: Guidelines for Site Assessment, Cleanup, <br /> and Underground Tank Closure, May 1988. State of California LUFT Task Force. <br /> Regional Board Staff Recommendations for Initial Evaluation and Investigation of Underground <br /> Tanks, Revised November 1989. North Coast, San Francisco Bay, and Central Valley regions of <br /> the California State Water Quality Control Board. <br /> Standards for the Construction and Destruction of Wells and Other Deep Excavations in Santa <br /> Clara County, Revised June 1989. Santa Clara Valley Water District. <br /> protocol.rep 4 <br />