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;EQUOIA ANALYTICAL 09 Striker Avenue, Suite 8 • Sacramento, CA 95834 (gip 6) 921-9600 • FAX (916) 921-0100 IV MID ,AUL - 6 1992 June 24, 1992 �1AMWIlEg A�� Dear Client: 1 Sequoia Analytical is pleased to present our new reporting format for fuel hydrocarbon analysts. In addition to reporting the TPH concentration, the chromatogram pattern will be reported to gave you more data regarding the nature of the contamination Please note, however, that the analytical method and the price have not changed The LUFT Manual requires that a compound appearing m the Total Petroleum Hydrocarbon range must be reported, even if it is not gasoline or diesel. In addition to reporting the TPH concentration, the new format will report the chromatogram pattern. For example,a carbon chain range of Cg - C12 in a Total Purgeable Petroleum Hydrocarbon (TPH-Gas/BTEX) analysis may indicate the presence of Jet Fuel A Total Extractable Petroleum Hydrocarbon (TPH-Diesel) analysis may report discrete peaks, indicating the presence of solvents. The enclosed chart will allow you to convert hydrocarbon chain lengths into potential sources of contamination Please be aware that these ranges are estimated. Your Project Manager can work with you to determine if further examination by Fuel Fingerprint Analysis (EPA 8015 mod.), or GC/MS should be requested to provide additional information. Sequoia Analytical has made this improvement based upon the suggestions of our clients. We are committed to the highest standards of quality and customer service, and welcome your suggestions to help us meet this commitment- Please feel free to contact your Project Manager or me if you have any questions, suggestions, comments. or if you would like to be given a presentation on fuel hydrocarbon analysis Very truly yours, SEQUOIA ANALYTICAL Sheldon Fung Marketing Associate