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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 RECETIVED '-33 <br /> (510) 686-9600 9 FAX (510) 686-9689 <br /> oux Associates Client Project ID Arco 2130/Stockton ' Sampled Oct 13, 1903 <br /> i',', <br /> 55 Gateway Blvd Ste 770 Sample Matrix Soil Received Oct 14, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Oct 18, 1993 <br /> Attention Paul Supple First Sample# 310-0539 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> ' Reporting Sample <br /> Analyte Limit I D <br /> mg/kg 310-0539 <br /> CA 5 (A-D) <br /> Purgeable <br /> Hydrocarbons 10 78 <br /> Benzene 0 005 N D <br /> Toluene 0 005 N D <br />' <br /> Ethyl Benzene 0 005 0 012 <br />.Total Xylenes 0 005 0 038 <br />'Chromatogram Pattern Non-Gasoline <br /> Mixture <br /> Quality Control Data <br /> Report Limit Multiplication Factor 20 <br /> Date Analyzed 10/14/93 <br /> Instrument Identification HP-4 <br /> Surrogate Recovery, % 95 <br /> (OC 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 /> EQUOIA ANAL ICAL <br /> Kenneth K F Lee <br /> Laboratory Director <br />' 3100539 ROU <1> <br />