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g"` s '� ^.� •. <br /> 5 L ' <br /> Og <br /> M1 <br /> T Man M11 <br /> Regional Board Staff Recommendations 10 August 1990 <br /> r Preliminary Site Investigation <br /> EXPLANATION FOR TABLE #7.: XINIMUM VERIFICATION ANALYSIS <br /> 1. OTHER METHODOLOGIES are continually being developed, and as <br /> methods are accepted by EPA or DHS, they also can be used. <br /> 2. For DRINKING WATER SOURCES, EPA recommends that the 500 <br /> series for volatile organics be used in preference to the 600 <br /> series because the detection limits are lower and the QA/QC <br /> is batter. <br /> 3. APPROPRIATE STANDARDS for the material stored in the tank are <br /> to be used for all analyses on Table #2. For instance, <br /> seasonally, there may be five different jet fuel mixtures to <br /> ± be considered. <br /> € 4. TO AVOID FALSE POSITIVE detection of benzene, benzene-free <br /> solvents are to be used. <br /> 5. TOTAL PETROLEUM HYDROCARBONS (TPH) as gasoline (G) and diesel <br /> (D) ranges (volatile and extractable, respactively) are to be <br /> analyzed and characterized by GC.FID with a fused capillary j <br /> column and prepared by EPA method 5030 (purge and trap) for <br /> volatile hydrocarbons, or extracted by sonication using 3550 <br /> methodology for extructible hydrocarbons. Fused capillary <br /> P � columns ar6 preferred to packed columns; a packed column may <br /> be used as a "first cut" with "dirty" samples or once the <br /> hydrocarbons have been characterized and proper QA/QC is <br /> followed. <br /> 6. TETRAETHYLLEAD (TEL) analysis may be required if total lead <br /> is detected unless the detenainatlon is made that the total <br /> k lead concentration is geogenic (naturally occurring). <br /> 7. CHLORINATED HYDROCARBONS (CL HC) and BENZENE, TOLUENE, XYLENE <br /> r. AND ETHYLBENZENE (BTX&E) are analyzed in soil by EPA methods �,•. <br /> 8010 and 8020, respectively, (or 8240) and for water 541 and <br /> '.: 602, respectively, (or 624) . <br /> S. OIL AND GREASE (0 & G) may be used when heavy, straight chain <br /> hydrocarbons may be present. Infrared analysis by method <br /> 418.1 may also be acceptable for 0 & G if proper standards <br /> are used. "Standard Methods" 17th Edition 1989,...-has chan ed <br /> the 503 serleg to 5520. <br /> - - -- - -- - <br /> 9. PRACTICAL QUANTITATION RSPORTING LIMITS are influenced by <br /> matrix problems and-laboratory-QA/QC-procedures.{-Following <br /> are the Practical Quantitation Reporting Limits: <br /> SOIL PPM WATER PPB <br /> TPH G 1.0 50.0 <br /> TPH D 1.0 50.0 <br /> BTX&E 0.005 0.5 <br /> 0. & 'G. 50.0 5,000.0 <br /> 18 <br />