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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.C4 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 /> ATC Associates, Inc Client Prol ID Ripon Unified School Sampled 09/21/98 <br /> 1260 Graphics Drive Sample Descript RVSD-SB10-20 0 Received 09/22/98 <br /> Modesto, CA 95351-1502 Matrix SOLID Extracted 09/24/98 <br /> Analysis Method 8015Mod/8020 Analyzed 09/24/98 <br /> tAttention Drew Van Allen Lab Number 9809E04-05 Reported 09J30J98 <br /> C Batch Number GC092498BTEXEXA <br /> Instrument ID GCHP01 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> 1 Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> 1 TPPH as Gas 1 0 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 /> 1 Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 98 <br /> 4-Bromofluorobenzene 60 140 103 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> Ual <br /> ytes reported as N D were not present above the stated limit of detection <br /> QUOIA ANALYTICAL - ELAP #1210 <br /> 1 <br /> Project anager Page 11 <br /> i <br />