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Clayton <br /> S"No E-NMRONME\TAL <br /> CONSULTANTS <br /> All samples are collected in such a manner so as to minimize the volatilization of a sample <br /> due to agitation and/or transfer from bailer to sample container. Samples are collected so <br /> that contaminants most sensitive to volatilization are sampled first. <br /> 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 field. 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 prior to delivery to the <br /> laboratory, for example during shipment by an overnight shipper, a custody seal is placed on <br /> each sample container and/or sample chest to ensure that the samples have not been <br /> tampered with during transportation. The custody seal is signed by the sampler, and the date <br /> and time that the seal was placed is recorded. The elapsed time between sample collection <br /> and delivery to the laboratory never exceeds 48 hours. Water samples are not held for more <br /> than 14 days prior to analysis and are kept at 4°C at all times. <br /> To document and trace samples from time of collection, a signed chain-of-custody record is <br /> filled out by the sampler and accompanies the samples through the laboratory analyses. The <br /> completed 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, <br /> Cleanup, and Underground Tank Closure, May 1988. State of California LUFT Task Force. <br /> Regional Board Staff Recommendations for Initial Evaluation and Investigation of <br /> Underground Tanks, Revised November 1989. North Coast, San Francisco Bay, and Central <br /> Valley regions of the California State Water Quality Control Board. <br /> Standards for the Construction and Destruction of Wells and Other Deep Excavations in <br /> Santa Clara County, Revised June 1989. Santa Clara Valley Water District. <br /> V <br /> it <br /> 4 <br />