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mom= STL Submission: 2005-09-0053 Metals Geomatrix Consultants Attn.: Jennifer Patterson 2101 Webster Street,12 th floor Oakland, CA 94612 Phone: (510) 663-4100 Fax: (510)663-4141 Project: 9837.000 Received: 09/02/2005 15:40 Batch QC Report Prep(s): 3010A Test(s):60106' Laboratory Control Spike Water QC Batch#2005/09107-05.15 LCs 2005/09/07-05.15-002 Extracted:09/07/2005 Analyzed: 09/08/2005 08121 " LCSD 2005109/07-05.15-003 Extracted:09107!2005 Analyzed:09/08/2005 08:24 Compound Conc. mg/L Exp.Conc. Recovery% 1RPD1 Ctd.Limits% Flags LCS LCSD LCS I LCSD % I Rec. RPD LCS LCSD Antimony 0.495 0.491 0.500 99.0 98.2 0.8 80-120 20 Arsenic 0.464 0.461 0.500 92.8 92.2 0.6 80-120 20 Barium 0.502 0.498 0.500 100.4 99.6 0.8 80-120 20 Beryllium 0.493 0.487 0.500 98.6 97.4 1.2 80-120 20 Cadmium 0.493 0.491 0.500 98.6 98.2 0.4 80-120 20 Chromium 0.500 0.496 0.500 100.0 99.2 0.8 80-120 20 Cobalt 0.498 0.494 0.500 99.6 98.8 0.8 80-120 20 Copper 0.500 0.495 0.500 100.0 99.0 1.0 80-120 20 Lead 0.497 0.494 0.500 99.4 98.8 0.6 80-120 20 Molybdenum 0.500 0.498 0.500 100.0 99.6 0.4 80-120 20 Nickel 0.498 0.495 0.500 99.6 99.0 0.6 80-120 20 Selenium 0.489 0.485 0.500 97.8 97.0 0.8 80-120 20 Silver 0.498 0.493 0.500 99.6 98.6 1.0 80-120 20 Thallium 0.499 0.498 0.500 99.8 99.6 0.2 80-120 20 Vanadium 0.500 0.497 0.500 100.0 99.4 0.6 80-120 20 Zinc 0.497 0.493 0.500 99.4 98.6 0.8 80-120 20 Magnesium 4.97 4.92 5.00 99.4 98.4 1.0 80-120 20 Iron 4.98 4.93 5.00 99.6 98.6 1.0 80-120 20 Aluminum 4.98 4.94 5.00 99.6 98.8 0.8 80-120 20 Manganese 0.500 0.496 0.500 100.0 99.2 0.8 80-120 20 Sodium 20.0 19.6 20.0 100.0 98.0 2.0 80-120 20 Potassium 119.7 119.6 120.0 98.5 98.0 0.5 80-120 20 Severn Trent Laboratories, Inc. 09/13/200507:55 STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 A W 0&VOM Tent ft Tel 9254841919 Fax 9254841096`w .stl-inc.wm'CA DHS ELAP#2496 Page5of6