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Regional Board Staff Recommendations 10 August 1990 <br /> Preliminary Site Investigation <br /> EXPLANATION FOR TABLE #2: MINIMUM VERIFICATION ANALYSIS <br /> I . 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 deteption limits are lower and the QA/QC <br /> is better. <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 /> i solvents are to be used. <br /> 1 <br /> 5. TOTAL PETROLEUM HYDROCARBONS (TPH) as gasoline (G) and diesel <br /> (D) ranges (volatile and extractable, respectively) are to be <br /> analyzed and characterized by GCFID with a fused capillary <br /> ! column and prepared by EPA method 5030 (purge and trap) for <br /> fx volatile hydrocarbons, or extracted by sonication using 3550 <br /> ! methodology for extractable hydrocarbons. Fused capillary <br /> # columns i.re 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 determination is made that the total <br /> lead concentration is geogenic (naturally occurring) . <br /> 7. CHLORINATED HYDROCARBONS (CL HC) and BENZENE, TOLUENE, XYLENE <br /> AND ETHYLBENZENE (BTX&E) are analyzed in soil by EPA methods <br /> r 8010 and 8020, respectively, (or 8240) and for water 601 and <br /> 602, respectively, (or 624). <br /> 8. OIL AND GREASE (G & G) may be used when heavy, straight chain <br /> hydrocarbon@ may be present. Infrared analysis by method <br /> 41B.1• r,-Luy also be acceptable for 0 & G if proper standards f . <br /> ?-a used. "Standard Methods" 17th Edition 1989, has changed <br /> the 503 series to 5520. <br /> 9. PRACTICAL QUANTITATION REPORTING LIMITS are influenced by x <br /> matrix problems and laboratory QA/QC procedures. Following j <br /> -, ------ are-the--Practa-caT 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 /> r. <br /> 18 <br />