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Regional Board Staff Recommendations <br /> 2 June 1988 <br /> (revised 18 May 1989) <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 /> S. PRACTICAL QUANTITATION/REPORTING LIMITS are matrix dependent. <br /> Those listed are provided for guidance and should be <br /> achievable in most instances. Practical quantitation <br /> reporting limits for the above soil and water analyses should <br /> be as follows: <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 /> O & G 50. 0 5,000 . 0 <br /> When not achievable, sufficient justification should be / <br /> submitted. <br /> 6. 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 extractable 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 /> 7 . TETRAETHYLLEAD (TEL) may be analyzed as total lead. However, <br /> a confirming analysis must be completed using a soil sample <br /> at the same soil depth in another borehole, or for water, <br /> from an upgradient well that is not contaminated with <br /> hydrocarbons. <br /> 8. 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 /> 9. OIL AND GREASE (O & 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 O & G if proper standards <br /> are used. <br /> 18 <br />