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1 <br /> i <br /> JHhJ- -E� 1s 09 FF,ar, TO 9-1+x40179 <br /> QUALITY AS G[ <br /> LABORATORY <br /> 25 February 1992 <br /> Mr Erik Fredrick <br /> 2701 East Hammer Laine #103 <br /> Stockton, CA 95210 <br /> Re, EPA Methods—355V and 5034 <br /> Dear Mr Fredrick- <br /> Pursuant to your request I am enclosing a pags from the SA/M Manual "Laboratory <br /> Analysis Requirement," Section Ill Please note that for gasoline and or diesel <br /> contamination a solvent extraction method is recommended and for gasoline only analyses <br /> the recommended metpod is purge and trap. <br /> Quality Assurance Laboratory (QAL) performs T°H analysis in soxl samples by the <br /> extraction of the campie with carbon disulfide using a sonication method (EPA Method <br /> 3550) and analysis by Gas Chromatography with a Flame Ionization Detector The use <br /> of extraction for both gasoline and diesel fractr:)ns is common practice within the <br /> environmental laboratory industry, although extraction solvents vary widely Local <br /> laboratories utilize such various solvents as pentane, freon, carbon disulfide, methylene <br /> chloride, among others All of these solvents demonstrate good extraction efficiency <br /> Total Petroleum Hydroqarbon analysis by the LUFT Method (Leaking Underground Fuel <br /> Tank Manual) encomposses the entire range of hydrocarbons, gasoline through diesel <br /> fractions CAL analytes each sample with this in mind, examining the resultant <br /> chromatogram for both gasoline and diesel presence (carbon range C4 - C,,) <br /> EPA Method 5030 refers to Purge and Trap. The L/se of Method 5030 can only allow <br /> detection of lighter hydrocarbons such as gasolir,e. Heavier fuels (diesel) wilt not be <br /> detected when using tApthod 5030. The County of,3an Diego requests that Both gasolene <br /> and diesel be tested for in soil and water samples submitted to the San Diego HM,%4D <br /> In order to provide the most economical means of providing this information to our client <br /> we use extraction to find gasoline and diesel without having tc perform two separate <br /> analyses. <br /> Maliing Address San Grego (6 J6 <br /> P O Box 22567 6605 Nancy Ridge Dr Fax 3642 <br /> San Diego,CA 92192 San Diego, CA 921 1 <br />