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region Board Staff Recommendations 10 August 1000 <br /> Preliminary Site Investigation <br /> EXpLANATIoN FOR TABLE 02: mi-MIX.% VERIFICATION ANALYSIS <br /> 1. OTHER METHODOLOGIES are continually .in 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 an Table #2. For instance, <br /> seasonally, there may be five different let fuel mixtures to <br /> be considered. <br /> 4 . TO AVOID FAL$E POSITIVE detection of benzene, benzene-free <br /> solvents, are to be used. <br /> 5. TOTAL PETROLEUM HYDROCARBONS (TPP) 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 extracts l+ 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 is made that the total <br /> lead concentration is geoqenic (naturally occurring) . <br /> 7. CHLORINATED HYDROCARBONS (CL HQ and BENZENEO TOLUENE, XYLENE <br /> AN <br /> , D ETN YLBENZENE (BTX&E) are analyzed in soil by EPA methods <br /> B010 and 8020, respectively, (or 8240) and for water 601 and <br /> 602, respectiV01Y, (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. <br /> H. <br /> 9. PRACTICAL QUANTITATION REPORTING L114ITS are influenced by <br /> matrix problems and laboratory QA/QC procedures. Following <br /> are the Practical Quantitation Reporting Limits: <br /> BDIIL-MTE ppE <br /> TPH G 1.0 50. 0 <br /> TPH D 1.0 50.0 <br /> BTUE 0.00S 0.5 <br /> 0 fi G 50.0 5,000.0 <br /> is <br />