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t�R 4AT:R d H ZAR,^.01 WttSTE LABORATOn^y CERT:FIED t'y C% 'CRN7-A DEFT Of KE L7H <br /> SSR\: rS <br /> tte 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 a <br /> m:Jor 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 analysis 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 r <br /> spilled in the area but has become degraded by soil microorganisms. This <br /> phenomenon is sometimes noted in neorsurfoce samples. In the event that <br /> e: evoted lead levels ore found, a second general analysis for orconic lead or a <br /> Specific analysis for tetroethyl and tetromethyl lead con be requested if the <br /> regulator so desires. Typically only a very low percentage of the total lead <br /> I% found to be organic lead. Even this is most often found to be cssocioted <br /> w:.th fulvic and humid matter as cheloted inorganic lead. It is our experience <br /> that only a few isolated cases actually involve organic lead in a non-cheloted <br /> farm. <br /> The procedures used by CCAS for spilled fuel characterization have been <br /> submitted to and reviewed by the California Deportment of Health Services and <br /> by the California Water Quality Control Board. A memorandum from Gordon Lee r <br /> Bcggs, Underground Tank Program Coordinator for the California Central Valley I <br /> Regional Water Quality Control Board refers to CCAS' GC/MS method. Three pages <br /> from this memorandum are attached. <br /> r <br /> T <br /> T <br /> T <br /> T <br /> T <br /> T <br /> Pogo 8 <br /> - T <br /> CENTRAL CCAST A%ALYTICAL SERVICES Son Luis Obispo, Ccliforn:a (2:5) 543-2553 <br />