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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 4s) 404 N Wiget Lane Walnut Creek CA 94598 (915)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)79Z-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Prod ID Ripon Unified School Sampled 09/21/98 <br /> 1260 Graphics Drive Sample Descript RVSD-SB7-20 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 /> IAttention Drew Van Allen Lab Number 9809E04-01 Reported 09j30198 <br /> C Batch Number GC092498BTEXEXA <br /> Instrument ID GCHP01 <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 /> Tnfluorotoluene 70 130 100 <br /> 4-B romofl uoro benzene 60 140 105 <br /> I <br /> b <br /> 1 <br /> 1 <br /> CnalQUOIA <br /> ytes reported as N D were not present above the stated limit of detection <br /> ANALYTICAL - ELAP #1210 <br /> 1 <br />®roject nager Page 2 <br />