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1 <br /> Q Sequoia 680 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 Smker 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 /> ATC Associates, Inc Client Prod ID Ripon Unified School Sampled <br /> 1260 Graphics Drive Sample Descript Method Blank Received 09/22/98 <br /> Modesto, CA 95351-1502 Matrix SOLID Extracted 09/24/98 <br /> ' Analysis Method 8015Mod/8020 Analyzed 09/25/98 <br />�Attention Drew Van Allen Lab Number 9809E04-10 Reported 09J30f98 <br /> C Batch Number GC092498BTEXEXA - <br /> Instrument ID GCHP18 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br />'Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br />'TPPH as Gas 10 N D <br /> Benzene 00050 N D <br /> Toluene 00050 N D <br /> Ethyl Benzene 00050 N D <br /> Xylenes (Total) 00050 N D <br /> Chromatogram Pattern <br />'Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 90 <br /> 4-Brornofluorobenzene 60 140 90 <br /> 1 <br /> I <br /> Ual <br /> ytes reported as N D were not present above the stated limit of detection <br /> QUOIA ANALYTICAL - ELAP 01210 <br />®roject Manager Page 20 <br /> 1 <br />