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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Sutte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 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-SB8-25 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 /> Attention Drew Van Allen Lab Number 9809E04-03 Reported 09j30j98 <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 250 2000 <br /> Benzene 1 2 N D <br /> Toluene 1 2 1 7 <br />'Ethyl Benzene 1 2 11 <br /> Xylenes (Total) 1 2 100 <br /> Chromatogram Pattern <br /> Unidentified HC >C10 <br />'Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 100 <br /> 4-13romofluorobenzene 60 140 00 <br /> b <br /> 1 <br />(alytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP #1210 <br /> roles anager Page 6 <br />