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Sequoia <br /> � y y O1� MO Chesapeake Dnve Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 1 404 N Wlget 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)92I 0100 <br /> mjW Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> 1 <br /> Ground Zero Analysis, Inc Client Prol ID 98-183, Knowles Roek Sampled 12/07/98 <br /> 1714 Main St Sample Descrlpt KR Influ Received 12/08/98 <br /> 1 Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 12/10/98 <br /> Attention Greg Stahl Lab Number 9812508-01 Reported 12117/98 <br /> ' QC Batch Number GC120998BTEX03A <br /> Instrument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> 1 Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 20 220 <br /> Benzene 020 N D <br /> Toluene 020 078 <br /> Ethyl Benzene 020 1 5 <br /> 1 Xylenes (Total) 020 7 8 <br /> Chromatogram Pattern <br /> Unidentified HC C6-C12 <br /> 1 Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 113 <br /> i <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 'SEQUOIA ANALYTICAL - CLAP #1210 <br /> r <br /> isect Manager Page 1 <br />