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AIR, WATER & HAZARDOUS---WASTE LABORATORY CERTIFIED by CALIFORNIA DEPT of HEALTH SrIRVICES FIC . Both techniques ore sufficiently sensitive to detect spilled fuels of sub part per million levels. COMMENTS REGARDING EPA METHODS 8015, 8020, 8240 & 8270 EP1% apparently has included this method in SW-846 to provide guidance for the - determination of potentially hazardous moteriols which do not respond well to electron-copture detection (ECD), photoionizotion detection (PID) or ho:;ogen-selective detection (HALL). Since the flome ionization detector (FID) employed by EPA 8015 is both sensitive and non-selective, most organic compounds listed will produce a strong signol. Therefore, ocrylomide, carbon disulfide, diethyl ether, methyl ethyl ketone (MEK), methyl isobutyl ketone (MIRK), and paroldehyde which are the compounds listed in EPA 8015 con readily be detected using this method. Furthermore, the FID is sufficiently noiselective to permit extension of the method to a host of other materials. In many commercial laboratories, fuels are determined by pattern comparison using gas chromatography with flame ionization detection (GC/FID) using on adaptation of EPA Method 8015. Samples containing volatile onolytes may be introduced to the gas chromtogroph by direct injection, heodspoce (EPA Method 5020) or purge-and-trop (EPA Method 5030). When used in this way, EPA Method 8015 can be used to characterize gasoline, diesel h2, jet fuel, aviation gas, Stoddard solvent and other volatile hydrocarbon distillates. The results may be expressed in terms of "ppm gasoline", "ppm total petroleum hydrocarbon (TPH)" or some other appropriate description. The analysis is described as a "TPPH (Total Purgeoble Petroleum Hydrocarbon Analysis)", a "fuel characterization analysis", or a "fuel fingerprint". A column substitution is usually made as even the volatile fuels contain some components requiring temperatures beyond the maxima permitted for the columns specified in EPA Method 8015. When semivolotile fuels or analytes are to be determined, the FID and EPA Method 8015 may still be employed. In such cases, the sample may be introduced by direct injection, prepared for analysis by liquid-liquid extraction (EPA Wthod 3510), sonication (EPA Method 3550) or Soxhlet extraction (EPA Method 3!,40). Following extract concentration, an aliquot of the concentrate is subjected to gas chromotographic separation followed by flame ionization detection. This variation of EPA Method 8015 is often used for the analysis of diesel #4, crude oil, bunker fuel and fuel oil B6. It is sometimes used for the analysis of diesel N2 and even gasoline, although much of the gasoline components aro lost during tho concentration step. This type of analysis is Often described as a TPH (Total Petroleum Hydrocarbon analysis). When doing this type of analysis, CCAS refers to the results as Total Semivolotile Petroleum Hydrocarbons and lists the fuel used as a standard for quantifying the material. CCAS uses standards which ore provided by the client or which resemble the samples' chromatographic pattern. While CCAS is capable of performing all of the oformentioned vorictions of EPA 8015, our recommended approaches to the analysis of nonhologenoted volatile organics, volatile fuels and in some cases, even semivolatile fuels ore bcsed upon GC/MS as outlined in EPA Methods 524.2. 8240 and 8270. If techniques such as cryogenic focussing, selected Son monitoring, capillary column Page 6 -- CENTRAL COAST A%1LYTICAL SEPV..CES Son Luis Ob:soo. Cc':.t.f�+�r'� (F,75) SLt.,d�cS: --