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� TL <br /> 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 /> Protect 3254 Received 12/03/2002 1315 <br /> SINGH S UNOCAL <br /> Batch QC Report <br /> Prep(s) 7196A water Test(s) 7196A <br /> Matrix Spike( MS 1 MSD) Water QC Batch#2002112103-01 31 <br /> MW-2 >> MS Lab ID 2002-12-0042-001 <br /> MS 2002112/03-01 31-004 Extracted 12/03/2002 Analyzed 12/03/2002 17 20 <br /> Dilution 1 00 <br /> MSD 2002112103-01 31-005 Extracted 12/0312002 Analyzed 12/03/2002 17 20 <br /> Dilution 100 <br /> Compound Conc mg/L Spk Leve Recovery Limits% Flags <br /> M5 MSD Sample m IL MS MSD I RPD Rec RPD MS MSD <br /> Chromium(Hexavalent) 0 220 10210 000 0200 1100 11050 1 47 80-120 120 <br /> • Severn Trent Laboratories, Inc 12/11/2002 08 57 <br /> STL San Francisco"1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Sev rn Trent Pic Tel 925 484 1919 Fax 925 484 1 096*www stknc com*CA DHS FLAP*2496 Page 5 of 5 <br />