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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 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)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ground Zero Analysis, Inc Client Prol ID 96-163, Knowles Roek Sampled 11/23/98 <br /> 1714 Main St Sample Descript KR Efflu Received 11/24/98 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 11/26/98 <br /> Attention Greg Stahl Lab Number 9811 F62-02 Reported 12JO2198 <br /> 'QC Batch Number GC112698BTEX02A - <br /> Instrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> I Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> ' TPPH as Gas 10 N D <br /> Benzene 010 031 <br /> Toluene 010 N D <br /> Ethyl Benzene 010 N D <br /> ' Xylenes (Total) 010 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br /> ' Trifluorotoluene 70 130 123 <br /> b <br /> i <br /> t <br /> i <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> 'SEQUOIA ANALYTICAL - ELAP 01210 <br /> ct Manager Page 2 <br />