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F <br /> 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 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 (TEL) analysis may.;;be required if total lead <br /> is detected unless the determination ismade `that °the total <br /> lead concentration is geog'nic (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 /> 8 . OIL AND GREASE (Q & 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 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 /> 3 <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 /> i <br /> . E <br /> II <br />