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OES-Di Salva Trucking Facility <br /> Ltr Addendum <br /> February 21,1995 <br /> a Page-2 <br /> f' I <br /> and trap procedure to prepare the sample and gas chrome ography - fame ionization detector (GC- <br /> FID) to identify hydrocarbon constituents in the soil. Because of the elevated boiling point of diesel I <br /> fuel, Method 8015 is typically modified (8015/Mod) to include a sample preparation procedure to <br /> capture diesel. However, a standard modification procedure for 8015/Mod does not exit and <br /> modification procedures, therefore, can vary from laborat ry to laboratory. Extraction by sonication <br /> (EPA Method 3550) is one method laboratories use to prepare soil samples to be analyzed for diesel ' <br /> fuel. <br /> t <br /> Tri-Regional Board Staff Recommendation for P eliminary Evaluation and Investigation of <br /> Underground Tank Sites (Tri-Regional,:Guidelines) recommends the use of EPA Method 3550 when <br /> analyzing for TPH-d- The Leaking Underground Fuel Tank field manual (LUFT manual) does not <br /> specify an extraction method for preparing a soil sample to be analyzed for diesel fuel, however, the <br /> -LUFT inabual does recommien.d"GC-FID as the method--f r`identifying-diesel in soil.-Therefore, when 3 <br /> analyzing for TPH-d in soil, the Tri-Regional Guidelines and the LUFT manual collectively <br /> recommend EPA Method 3550 for sample preparation and GC-FID to identify hydrocarbon <br /> constituents. This collective method is`l referred to as Method 3550/LUFT by GeoAnalytical <br /> Laboratories, Inc., the laboratory to which soil samples c llected from the Di Salvo Trucking site <br /> would be delivered. Condor recommended in the September 27, 1994, work plan that Method <br /> 3550/LUFT be used for analyses for TPH-d in soil. Therefore, because EPA Method 8015 would not <br /> accurately detect longer chain hydrocarbons which may e present in a soil sample, Condor <br /> recommends to adhere to the analytical methods specifie in the September 27, 1994, work plan. If <br /> you have any questions or need additional information, p ease call me at (209) 668-9234. <br /> iF <br /> Sincerely, # <br /> arc R. Crum Robert J. J <br /> Geologist " California Registered <br /> Professional Engineer <br /> #51592 <br /> !F <br /> `Y <br /> !1 <br /> cc Mr. Keith Tallia <br /> f� <br /> 0ES\D1SALV0IDI SALADD.M W <br /> i <br /> i o <br /> CONDOR <br />