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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Str,ker Avenue 5wte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921- 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX 707 792-0342 <br /> ATC Associates, Inc «, Client Prod ID Ripon Unified School Sampled 09/21/98 <br /> 1260 Graphics Drive Sample Descript RUSD-SBI I-W Received 09/22/98 <br /> Modesto, CA 95351-1502 Matrix LIQUID <br /> Analysis Method EPA 8280 Analyzed 09/30/98 <br /> Attention Drew Van Allen Lab Number 9809E49-04 Reported 10J06J98 <br /> C Batch Number MS092998MTBEH6A <br /> nstrument ID H6 <br /> Oxygenate Compounds (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />'Ethanol 500 N D <br /> t-Butanol 100 N D <br /> Methyi t-Butyl Ether (MTBE) 20 N D <br />'DI-Isopropyl Ether (DIPE) 20 N D <br /> Ethyl t-Butyl Ether (ETBE) 20 N D <br /> t-Amyl Methyl Ether (TAME) 20 N D <br />'Surrogates Control Limits% % Recovery <br /> 1,2-Dichioroethane-d4 76 114 113 <br /> b <br /> 1 <br /> t <br /> alytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br />' r , <br /> Vroject nager Page 10 <br />