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® STL Submission: 2005-09-0053 <br /> Hexavalent Chromium <br /> Geomatrix Consultants <br /> Attn.:Jennifer Patterson <br /> 2101 Webster Street,12 th floor <br /> Oakland, CA 94612 <br /> Phone: (510)663-4100 Fax: (510)6631141 <br /> Project: 9837.000 Received: 09/02/2005 15:40 <br /> Batch QC Report <br /> Prep(s): 7196A water Test(s):7196A <br /> Laboratory Control Spike Water QC Batch#2005/09102-01.31 <br /> LCS 2005/09/02-01.31-002 Extracted:09/02/2005 Analyzed: 09/02/200510:50 <br /> LCSD 2005/09102-01.31-003 Extracted:09/02/2005 Analyzed:09/02/2005,10:50'' <br /> Compound Conc. mg/L 1Exp.Conc.1 Recovery% jRPD1 Ctri.Limits%l Flags <br /> LCS LCSD I I LCS I LCSD I % I Rec. I RPD I LCS I LCSD <br /> Chromium(Hexavalent) 0.211 0.210 0.200 105.5 105.0 1 0.5 1 85-115 20 <br /> Severn Trent Laboratories, Inc. 09/12/200518:11 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> Ac. am mTmMM Tel 925 484 1919 Fax 925 484 1096'w .stl-inc.00m'CA DHS ELAN 2496 Page 4 of 4 <br />