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Regional Board Staff Recommendations 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 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 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 /> solvents are to be used. <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 /> volatile hydrocarbons , or extracted by sonication using 3550 <br /> methodology for extractable hydrocarbons . Fused capillary <br /> columns are preferred to packed columns; a packed column may <br /> be used as a "first cur" 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 /> 8010 and 8020, respectively, (or 8240 ) and for water 601 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 changed <br /> the 503 series to 5520 . <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 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 />