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�\ <br /> Sequoia y 7 819 Striker Avenue,Suite 8 <br /> Ir ♦ Seq�.aoia <br /> Sacramento,916 CA -9600 <br /> �.a (916)92t-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequolalabs.wm <br /> Sierra-Pacific Groundwater,Inc. Project: Unocal Puregro Broadway <br /> project Number: N/A Reported: <br /> 4911 Windplay Drive,Ste.4 J <br /> El Dorado Hills CA, 95762 Project Manager: John Rapp 06/15/0] 16:23 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical-Walnut Creek <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch IF02001-EPA 3050B <br /> Blank(1F02001-BLK1) Prepared:06/02/01 Analyzed:06/05/01 <br /> Antimony ND 5.0 mg/kg <br /> Arsenic ND 5.0 " <br /> Barium ND 0.50 " <br /> Beryllium ND 0.50 " <br /> Cadmium ND 0.50 " <br /> Chromium ND 0.50 " <br /> Cobalt ND 0.50 " <br /> Copper ND 0.50 " <br /> Lead ND 1.0 " <br /> Molybdenum ND 0.50 - <br /> Nickel ND 1.0 " - <br /> Selenium ND 5.0 " <br /> Silver ND 0.50 " <br /> Thallium ND '5.0 " <br /> Vanadium ND 0.50 " <br /> Zinc ND 1.0 " <br /> LCS(1F02001-BSI) Prepared:06/02/01 Analyzed:06/05/01 <br /> Cadmium 49.8 0.50 mg/kg 50.0 99.6 80-120 <br /> Chromium 51.9 0.50 50.0 104 80-120 <br /> Copper 56.2 0.50 50.0 112 80-120 <br /> I,ead 51.8 1.0 50.0 104 80-120 <br /> Nickel 53.4 1.0 50.0 107 80-120 <br /> Zinc 51.8 1.0 50.0 104 80-120 <br /> LCS Du (1F02001-BSD1) Prepared:06/02/01 Analyzed:06/05/01 <br /> Cadmium 47.8 0.50 mg/kg 50.0 95.6 80-120 4.10 20 <br /> Chromium 49.5 0.50 50.0 99.0 80-120 4.73 20 <br /> Copper 48.1 0.50 50.0 96.2 80-120 15.5 20 <br /> Lead 50.4 1.0 50.0 101 80-120 2.74 20 <br /> Nickel 53.6 1.0 50.0 107 80-120 0.374 20 <br /> Zinc 49.1 1.0 50.0 98.2 80-120 5.35 20 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Tris analytical report must be reproduced in its entirely. <br /> Page 7 of 19 <br />