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.2- <br /> Regional Board Staff Recommendations <br /> 10 August 1990 <br /> Preliminary Site Investigation <br /> EXPLANATION FOR TABLE #2: MINIMUM VERIFICATION ANALYSIS <br /> 1. OTHER METHODOLOGIES are continually being developed, and as <br /> methods are accepted by EPA or DNS, 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 better. <br /> 3. APPROPRIA1111E 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 <br /> be considered.be fuel mixtures to <br /> 4. TO AVOID VALSE POSITIVE detection of benzene, benzene-free <br /> solvents are to he used. <br /> 5. TOTAL PETROLEUM HYDROCARBONS (TPH) as gasoline (G) and diesel <br /> (D) ranges (volatile and extractible, 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 /> volatile hydrocarbons, Or extracted by sonication using 3550 <br /> methodology for extractible hydrocarbons. Fused capillary <br /> columns are 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 <br /> (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 /> 8020 and 8020, respectively, (or 8240) and for water 601 and <br /> 602, respectively, (or 624). <br /> 8. OIL AND GREASE (0 & G) may be used when heavy, straight chain ' <br /> hydrocarbons may he present. Infrared analysis by method <br /> 418.1 may also be acceptable for0 & G if <br /> !n!roper standards <br /> are used g1jTd Methods" 17th Edit, 1989, has changed <br /> the 503 series <br /> 9, PRACTICAL QUANTITATION REPORTING LIMITS are influenced by <br /> matrix problems and laboratory QA/QC procedures. Following <br /> are the Practical Quantitation Reporting Limits: <br /> SOIL PPM RATER PPB <br /> TPH G 1.0 solo <br /> TPH D 1.0 50.0 <br /> BTX&E 0.005 0.5 <br /> 0 & G 50.0 51000.0 <br />