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STLSubmission# 2004-04-0043 <br /> Gas1BTEXIMTBE by 82608 <br /> SECOR-Sacramento <br /> Attn Amy Draffan <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 861-0400 Fax (916) 861-0430 <br /> Project 1623SEC550 Received 04/01/2004 15 40 <br /> Conoco Philips Site#6981 <br /> Site 4707 Pacific Ave , Stockton <br /> Batch QC Report <br /> Prep(s) 50306 Test(s) 82606 <br /> Laboratory Control Spike Water QC Batch#2004104106-1C 64 <br /> LCS 2004104106-1 C 64-002 Extracted 04/06/2004 Analyzed 04106/2004 08 02 <br /> LCSD 2004104106-1 C 64-024 Extracted 04/06/2004 Analyzed 04/06/2004 08 24 <br /> Compound Cone ug1L Exp Cone Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS I LCSD % Rec RPD LCS LCSD <br /> Methyl tort-butyl ether(MTBE) 222 227 25 888 908 22 65-165 20 <br /> Benzene 242 257 25 968 1028 6 0 69-129 20 <br /> Toluene 249 239 25 996 956 4 1 1 70-130 20 <br /> Surrogates(s) <br /> 1 2-Dichloroethane-d4 425 420 500 850 84 0 76-114 <br /> Toluene-d8 460 468 500 1920 1936 1 1 88-110 <br /> Severn Trent Laboratories, Inc , 04/07/2004 16 22 <br /> STI- San Francisco' 1220 Quarry Lane,Pleasanton,CA 94566 <br /> A pan of Severn Trent Plc <br /> Tel 925 484 1919 Fax 925 484 1096"www stl Inc com`CA OHS ELAP#2496 Page 6 of 9 <br />