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Sequoia 680 Chcsapcakc Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 404 N Wiget Lane Walnut Creek CA 94598 (5t0) 988 9600 FAX(510) 988 9,573 %70 Analytical 819 Striker Avenue Since 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Pactfic Environmental Group, Inc ' Client Prolect ID Arco 02133, Stockton, CA v Sampled J 'Dec 4, 1996 11315 Sunrise Gold Circle, #M Sample Matrix Water Received Dec 5, 1996 Rancho Cordova, CA 95742 Analysts Method EPA 5030/8020, DHS Luft Reported Dec 17, 1996 Attention Rusty Benkosky First Sample # 612-0181 ., r TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION Sample Sample Sample Sample Sample Sample Analyte Units Results Results Results Results Results Results pg/L 612-0181 612-0182 612-0183 612-0184 612-0185 612-0186 E-2 E-8 E-9 E-10 E-11 E-12 Purgeable 680 1,800 2,800 55,000 280 N D Hydrocarbons Reporting Limit 50 500 2,000 5 000 50 50 Benzene 64 29 290 3,600 35 N D Reporting Limit 050 50 20 50 050 050 Toluene N D N D 32 3,900 N D N D Reporting Limit 050 so 20 so 050 050 Ethyl Benzene 24 15 250 1,300 14 N D • Reporting Limit 050 50 20 50 050 050 Total Xylenes 27 N D 80 9,800 20 N D Reporting Limit 050 50 20 50 050 050 Chromatogram Gasoline Gasoline Gasoline Gasoline Gasoline & - Pattern C6-C12 C6-C12 C6-C12 C6 C12 Unidentified Hydrocarbons C6-1312 Quality Control Data Date Analyzed 12/06/96 12/06/96 12/06/96 12/10/96 12/10/96 12/10/96 Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 Surrogate Recovery, % 139 108 103 106 102 (QC Limits = 60-140%) Purgeable Hydrocarbons are quantitated against a fresh gasoline standard Analytes reported as N 0 were not detected at or above the reporting limit Matrix Interference • SEQUOIA ANALYTICAL., ELAP #1624 Linda C Schneider Project Manager/Sacramento Laboratory 6120181 PES <t>