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Sequoia 680 Ch.peak.Drive Redwood Gay,CA 94063 (415) 364-9600 FAX(415) 364-9233 404 N Wiget Lane Walnut Creek CA 94.598 (510) 988-9600 FAX(510)988-%73 Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921-96M FAX(916)921-0100 05MCON Client Project ID ARCO 2168, Stockton, CA Sampled Aug 21, 1997 1433 N Market Blvd Sample Matrix: Water Received Aug 22, 1997 Sacramento, CA 95834 Analysis Method EPA 5030/8020, DHS Luft Reported Sep 8, 1997 Attention Claudio Avila First Sample# 708-0907 s TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION Sample Sample Sample Sample Sample Sample Analyte Units Results Results Results Results Results Results Ng/L 708-0907 708-0908 708-0909 708-0910 708-0911 708-0912 MW-1 (54) MW-2(52) MW-3(53) MW-4(58) MW-5(54) MW-6(45) Purgeable 28,000 15,000 36,000 48,000 32,000 86,000 Hydrocarbons Reporting Limit 20,000 51000 20,000 10,000 10,000 10,000 Benzene 8,200 3,000 9,500 7,200 5,200 7,400 Reporting Limit 200 50 200 100 100 100 Toluene 380 1,200 910 5,000 3,900 4,000 Reporting Limit 200 50 200 100 100 100 Ethyl Benzene 860 320 2,000 1,200 560 1,300 Reporting Limit 200 50 200 100 100 100 • Total Xylenes 1,100 1,200 1,500 3,900 3,100 7,400 Reporting Limit 200 50 200 100 100 100 Chromatogram Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline Pattern C6-C12 C6-C12 C6-C12 C6-C12 C6-C12 C6-C12 Quality Control Data Date Analyzed 08/28/97 08/24/97 08/28/97 08/28/97 08/28/97 08/28/97 Instrument Identification GCHP-7 GCHP-2 GCHP-7 GCHP-7 GCHP-7 GCHP-7 Surrogate Recovery, % 93 88 99 89 91 97 (QC Limits = 60-140%) Purgeable Hydrocarbons are quantitated against a fresh gasoline standard Analytes reported as N C were not detected at or above the reporting limit SEQU IA ANALYTIC ELAP#1fi24 (7irndaC Schneider t Manager/Sacramento Laboratory 7080907 EMC <1>