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Sequoia 6130 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> �Y q 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 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 /> 1551 Industrial Road San Carlos CA 94070 4111 (650)232 9600 FAX(650)232 9612 <br /> Ground Zero Analysis, Inc Client Prol ID Knowles Roek Sampled 04/19/99 <br /> ' 1714 Main St Sample Descrlpt KR Influ Received 04/20/99 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 04/21/99 <br /> Attention Greg Stahl Lab Number 9904784-01 Reported 04J23199 <br /> ' CC Batch Number GC042199BTEX02A <br /> Instrument 0 GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> ' Analyte Detection Limit Sample Resuits <br /> ug/L ug/L <br /> ' TPPH as Gas 50 300 <br /> Benzene 050 N D <br /> Toluene 050 054 <br /> Ethyl Benzene 050 1 9 <br /> Xylenes (Total) 0 50 18 <br /> Chromatogram Pattern <br /> Unidentified HC C6-C12 <br /> ' Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 97 <br /> b RECEIVED <br /> E VED <br /> ' APR 2 8 1999 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 'SEQUOIA ANALYTICAL - ELAP #1210 <br /> 1 <br /> 1pMel Sh <br /> lect Ma Pager Page 1 <br />