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