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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-034Z ' Pacific Environmental Group-Sac Project Unocal 0123,Tracy,CA Sampled 1016198 11315 Sunrise Gold Circle St M Project Number 910-017 ]A. Received 1017/98 ' Rancho Cordova,CA 95742 Project Manager Mike Mitchener Reported 10/16/98 Total Metals by EPA 200 Series Methods/Quality Control Sequoia Analytical-Sacramento - ' Date Spike Sample QC Reporting Limit Recov RPD RPD Analyte Analyzed Level Result Result Units Recov Limits % Linut % Notes* Batch. 8100166 nate Prepared. 10114/98 EXtraC_tign Method EPA 3010A Blank 8100166-BLKI Cadmium 10/15/98 ND mg/l 000500 ' Chromium ND 000500 Lead '' ND 00500 Nickel ND 00200 Zinc ND 000500 ' LCS 8100166-BSI Cadmium 10/15/98 0 500 0 492 mg/1 800-120 984 ' Chromium 0 500 0 491 800-120 98 2 Lead " 0 500 0 504 800-120 101 Nickel 0 500 0 495 800-120 990 Zinc 0 500 0 491 800-120 98 2 atrix Spike 8100166-MSI 5810130-01 Cadmium 10/15/98 0 500 ND 0 485 mg/l 800-120 970 Chromium 0 500 000595 0 487 800-120 962 ' Lead 0 500 ND 0 488 800-120 976 Nickel 0 500 ND 0 464 800-120 928 Zinc 0 500 00168 0 499 800-120 964 ' Matrix Spike Dun 8100166-MSD] 5810130-01 Cadmium 10/15/98 0 500 ND 0 477 mg/1 800-120 954 200 166 Chromium 0 500 000595 0 478 800-120 944 200 1 89 ' Lead 0 500 ND 0 477 " 800-120 954 200 228 Nickel 0 500 ND 0 463 800-120 926 200 0 216 Zinc 0 500 00168 0 489 800-120 944 200 210 1 ' Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions I AaCneid r, Laboratory Director Page 9 of 13