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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> a 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Sequoi <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 /> oy P Weston, Inc Client Project 11) San Joaquin HSA Sampled May 19, 1999 <br />' 2300 Clayton Rd , Ste 1580 Sample Matrix Water Received May 20, 1999 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Jun 8, 1999 <br /> Attention Scott Lookingbill First Sample# 905-1686 <br />' QG Batch{Number GCO52699 GCO52699 G0052699 GC052699 G0052699 GCO52699 <br /> 802005A 802005A 802005A 802005A 802005A 80200-5A <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br />' Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D. I D. I D I D I D 1 D <br /> deg/L 905-1686 905-1687 905-1688 905-1689 905-1690 905-1691 <br /> MW-7 MW-2 MW-2A MW-10 Tank Field Blank <br />' Purgeable <br /> Hydrocarbons 50 73 38,000 10,000 17,000 N D N D <br />' Benzene 050 28 8,700 640 2,900 N D N D <br /> Toluene 050 N D N D 110 150 N D 062 <br /> Ethyl Benzene 050 N D 2,600 550 1,200 N D N D <br /> Total Xylenes 050 N D 2,700 470 1,300 N D 1 1 <br /> Chromatogram Pattern Gasoline Gasoline Gasoline Gasoline -- <br /> R"f <br />' Wt{J-7.A- tic ak.� <br /> Quality Control Data <br />' Report Limit Multiplication Factor 1 0 200 100 100 1 0 10 <br /> Date Analyzed 5/26/99 5/26/99 5/26/99 5/26/99 5/26/99 5/26/99 <br />' Instrument Identification HP-5 HP-5 HP-5 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 82 87 84 97 102 85 <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, #1271 <br /> • z <br />' anne Fegley <br /> Project Manager <br />' 9051686 RFW <1> <br />