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Sequoia Ego Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92 1-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 41 1 1 (650)232-9600 FAX(650)232-9612 <br /> P3939 <br /> Client Project Ib Arco #6020, Manteca Sampled Apr 30, 1999 <br /> bridge Road Sample Descript Sall, D-6 (2 5') Received Apr 30, 1999 <br /> Cameron Park, CA 95682 Analysis Method EPA 8260 Analyzed May 5, 1999 <br /> IAttention Joel Coffman Lab Number 905-0035 Reported May 5, 1999 <br /> )C Batch Number SP0504998260EXA <br /> Instrument ID GC/MS-2 <br /> OXYGENATED COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> Ng/K9 N9/Kg <br /> t-Butanol 5,000 N D <br /> _LMethyl - u y er 00 110,000 <br /> i-sopropy ter 00 <br /> Ethyl t-Butyl Ether (ETRE) 100 N D <br /> t-Amyl Methyl Ether (TAME) 100 N D <br /> 1 <br /> Surrogates Control Limit % % Recovery <br /> Dibromofluoromethane 50 150 69 <br /> 1,2-Dlchloroethane-d4 50 150 105 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> KEQUOIA ANALYTICAL, #1271 <br /> Melissa A Brewer <br /> Project Manager <br />' 9050030 PPP <9> <br />