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• 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)3649233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Roy 5 Weston, Inc Client Project Ib San Joaquin HSA Sampled May 17-18, 1999 <br /> 2300 Clayton Rd , Ste 1580 Sample Matrix Water Received May 18, 1999 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Jun 1, 1999 <br /> Attention Scott Lookingvlll First Sample # 905-1692 <br /> QC Batch Number GCO52499 GC052499 GCO52499 GCO52499 GC052499 <br /> 802004A 802004A 802004A 802004A 802004A <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D. I D I D I D <br /> Ng/L 905-1692 905-1693 905-1694 905-1695 905-1696 <br /> MW-6 MW-5 MW-9 MW-4 MW-3A <br /> Purgeable <br /> Hydrocarbons 50 53 N D N D N D 99 <br /> EBenzene 050 10 N D N D N D N D <br /> Toluene 050 ND ND ND ND ND <br /> I <br /> Ethyl Benzene 0 50 N D N D N D N D N D <br /> Total Xylenes 050 N D N D N D N D N D <br /> Chromatogram Pattern Gasoline -- -- - Discrete <br /> Peaks <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 5/24/99 5/24/99 5/24/99 5/24/99 5/24/99 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 98 95 94 94 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 /> SEQUOIA ANALYTICAL, #1271 <br /> It �neFegley <br /> lect Manager 9051692 RFW <I> <br />