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® TL Submission#: 2003.07-0562 <br /> Gas/BTEX Compounds by 8015MI8021 <br /> RMC Pacific Materials, Inc <br /> Attn Robert Aldenhuysen <br /> P O Box 5252 <br /> Pleasanton, CA 94566 <br /> Phone (925)426-2261 Fax (925) 426-2231 <br /> Protect Kerhnger Received 07/17/2003 13 58 <br /> Batch QC Re ort <br /> Prep(s) 5030 Test(s) 8020 <br /> Laboratory Control Spike Water QC Batch#2003107122-01 01 <br /> LCS 2003107122-01 01-004 Extracted 07/22/2003 Analyzed 07122/2003 08 47 <br /> LCSD 2003107122.01 01-005 Extracted 07/22/2003 Analyzed 07/22/2003 09 18 <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Umlts% Flags <br /> LCS LCSD LCS LCSD % Rec I RPD LCS I LCSD <br /> Benzene 91 9 898 1000 91 9 898 2 3 77-123 20 <br /> Toluene 918 890 1000 91 8 890 31 78-122 20 <br /> Ethyl benzene 904 880 1000 90 4 880 2 7 70-130 20 <br /> Xylene(s) 264 255 300 880 850 35 75-125 20 <br /> Surrogates(s) <br /> Tnfluorotoluene 1492 490 500 984 980 1 58-124 <br /> Severn Trent Laboratories, Inc 07/23/2003 15 16 <br /> STL San Francisco`1220 Quarry Lane Pleasanton CA 94566 <br /> A pert a+e.wm Trent Pic Tel 925 484 1919 Fax 9215 484 1096"www stl-Inc com'CA DHS ELAP#2496 Page 6 of 6 <br />