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SEQUOIA ANALYTICAL - f <br /> NCO819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 • FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5, Stockton Sampled Sep 13, 1993 <br /> 723 S St Sample Matrix Water Received Sep 13, 1993 <br /> Sacramento CA 95814 Analysis Method EPA 5030/8015/602 Reported Sep 16, 1993 <br /> Attention Mindy Wright First Sample # 309-0404 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Limit I D. <br /> ug/L 309-0404 <br /> Tank <br /> PLirgea6le <br /> Hydrocarbons 50 1,200 <br /> Benzene 05 76 <br /> Toluene 05 42 <br /> Ethyl Benzene 05 30 <br />• Total Xylenes 05 150 <br /> Chromatogram Pattern Gasoline <br /> Quality Control Data <br /> Report Limrt Multiplication Factor 10 <br /> Date Analyzed 9/14/93 <br /> Instrument Identification HP-2 <br /> Surrogate Recovery, % 130 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br />. SEQUOIA ANALYTICAL <br /> Linda C Schneider <br /> Project Manager <br /> 3094404 SRS <1> <br />