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STL <br /> Submission 2005-05-0393 <br /> Gas1BTEX/MTBE by 82608 <br /> SECOR-Sacramento <br /> Attn Kimber Collins <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Phone (916)861-0400 Fax (916)861-0430 <br /> Project 77CP 60004 04 6981 Received 05/12/2005 17 20 <br /> Conoco Philips Site#6981 <br /> Site 4707 Pacific Ave , Stockton, CA <br /> Batch QC Report <br /> Prep(s) 50308 Test(s) 82606 <br /> Matrix Spike ( MS 1 MSD ) Water QC Batch#2005/05/21-2A S4 <br /> MS/MSD Lab ID 2005-05-0415-002 <br /> MS 2005105121-2A 64-031 Extracted 05/21/2005 Analyzed 051211200519 31 <br /> Dilution 1 00 <br /> MSD 2005105121-2A 64-053 Extracted 05/21/2005 Analyzed 051211200519 53 <br /> Dilution 1 00 <br /> Compound Cone u !L S k Level Recove % Limits% Flags <br /> M5 MSD Sample u /L MS MSD RPD Rec RPD MS MSD <br /> Methyl tent-butyl ether 274 276 1 1 25 1052 1068 1 5 65-165 20 <br /> Benzene 246 249 ND 25 984 996 12 69-129 20 <br /> Toluene 284 282 0 812 25 1104 1096 07 70-130 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 575 582 500 1150 1165 73-130 <br /> Toluene-d8 521 518 500 1 104 1 1 1036 1 81-114 <br /> Severn Trent Laboratories, Inc <br /> 05/26/2005 15 05 <br /> STL San Francisco' 1220 Quarry Lane, Pleasanton CA 94566 <br /> A pert of$a m TrmN Pic Tel 925 484 1919 Fax 925 484 1096*www stl-inc com*CA DHS ELAP#2496 Page 6 of 6 <br />