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6 <br /> Preservatives are not added to any sample, unless instructed. ff requested, they are supplied <br /> by Clayton's laboratory. <br /> All sampla 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 Federal Express,a custocily seal is phiced 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 placed is recorded. The elapsed time between sample collection and <br /> delivery to the laboratory never exceeds 48 hours. Water samples are not held for more than <br /> f 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 chain-of-custody record is <br /> — filled out by the sampler and accompanies the sarnples through the laboratory analyses. The <br /> completed chain-of-custody is included with the analytical report from the laboratory. <br /> Groundwater Monitoring iamdelines,Revised February 19%. Alameda County District <br /> Groundwater Protection Program. <br /> Leaking Undergmmd Fuel Tank(LLWI)Field Manual. Guidelines for Site Assessment, <br /> Cleanup, ati.Underground Tank Closure,May 1988. State of California LUFr Task Force. <br /> Regicnal Bol% f Rec=tnendations for Initial Evaluation and Investigation of <br /> - Underground Tanks,Revised November 1989. North Coast,San Francisco Hay, and Central <br /> Valley regions of the California State Water Quality Control Hoard. <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 Dirrtrict. <br /> tP <br /> Now BMW MI <br /> - i <br />