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'eCi.r. �� w�i } a..�L. _ r yW b wq 5 Ye'.L •. - irinR' <br /> 6 <br /> AIR, WATER & HAZARDOUS WASTE LABORATORY CERTIFIED by CALIFORNIA DEPT of HEALTH SERVICES <br /> the surface while more mobile components are found at depth. Information of <br /> this type serves to validate all sample results obtained in the course of o <br /> major Investigation using GC/MS methods, yet it is very difficult to obtain all <br /> .� of these data using only EPA Method 8015. <br /> If a gasoline spill is suspected, we recommend chalysis for total lead as well <br /> as the fuel fingerprint. High levels of lead compared to background samples, <br /> even in the absence of a fuel fingerprint, may indicate that gasoline was <br /> Spilled in the a*ea but has become degraded by soil microorganisms. This <br /> phenomenon is sometimes noted in neorsurface samplts. In the event that <br /> elevated lead levels are found, a second general analysis for organic lead or a <br /> Specific analysis for tetraethyl and tetromethyl lead can be requested if the <br /> regulator so desires. Typically only o very low percentage of the total lead <br /> is found to be organic lead. Even this is most often found to be associated <br /> with fulv:c and humid matter as chelated inorganic lead. It is Dur experience <br /> that only a few isolated cases actually involve organic lead in a non-chelated <br /> form. <br /> The procedures used by CCAS for spilled fuel characterization have been <br /> submitted to and reviewed by the California Department of Health Services and <br /> by the California Water Quality Control Board. A memorandum from Gordon Lee <br /> Boggs, Underground Tank Program Coordinator for the California Control Valley <br /> Regional Water Quality Control Board ref,rs to CCAS' GC/MS method. Three pages <br /> from this memorandum ore attached. <br /> } <br /> J <br /> t4 <br /> r <br /> Page 8 <br /> Cal (805y 543-2553 <br /> CENTRAL COAST ANALYTICAL SERVICES San Luis Obispo, <br /> y: <br />