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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Wegis Environmental Consultants Client Project ID Shell, 141 N El Dorado, Stockton Sampled Sep 21, 1993 <br /> 1050 Melody Lane, Ste 160 Sample Matrix Air Received Sep 22, 1993 <br /> Roseville, CA 95678 Analysis Method EPA 5030/8015/8020 Reported Oct 7, 1993 <br /> Attention Paul Graff First Sample # 309-0708 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Umd 10. <br /> ppmv 309-0708 <br /> G2 Eff <br /> Purgeabie <br /> Hydrocarbons 14 74 <br /> Benzene 0 016 N D <br /> Toluene 0 013 1 4 <br /> Ethyl Benzene 0 012 1 4 <br /> 40 Total Xylenes 0 012 56 <br /> Chromatogram Pattern Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 50 <br /> Date Analyzed 9/23/93 <br /> Instrument Identification HP-2 <br /> Surrogate Recovery, % 100 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> EQUOIA ANALYTICAL <br /> Linda C Schneider <br /> Project Manager 3090708 AEG <2> <br />