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Submission# 2002-12-0042 <br /> Hexavalent Chromium <br /> Aqua Science Engineers, Inc <br /> Attn Erik Paddleford <br /> 208 West EI Plntado <br /> Danville, CA 94526 <br /> Phone (925) 820-9391 Fax (925) 837-4853 <br /> Project 3254 Received 12103120021315 <br /> SINGH S UNOCAL <br /> Batch QC Report <br /> Prep(s) 7196A water Test(s) 7196A <br /> Laboratory Control Spike Water QC Batch#2002112103-01 31 <br /> LCS 2002112103-01 31-002 Extracted 12103/2002 Analyzed 12/03/2002 17 20 <br /> LCSD 2002112103-01 31-003 Extracted 12/03/2002 Analyzed 12/03/2002 17 20 <br /> Compound Conc mg/L Exp Conc Recovery RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Chromium(Hexavalent) 0 210 0 210 0 200 1050 11050 0 0 80-120 20 <br /> Severn Trent Laboratories, Inc 1 2/1 112002 08 57 <br /> STL San Francisco"1224 Quarry Lane Pleasanton CA 94566 <br /> A part of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096"www stl-inc corn'CA DHS ELAP#2496 Page 4 of 5 <br />