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Sequoia 680 Chesapeake Drive Redwood City A (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek,CA 945984598 (925)988-9600 FAX(925)988-9673 <br /> 819 Stnker 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 Descrlpt RVSD-SB11-25 0 Received 09/22/98 <br /> Modesto, CA 9535 1-1 502 Matrix SOLID Extracted 09/24/98 <br /> Analysis Method 8015Mod/8020 Analyzed 09/28/98 <br /> Attention Drew Van Allen Lab Number 9809E04-08 Reported 09130198 <br /> C Batch Number GCO92498BTEXEXA - <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 00051 <br /> Toluene 00050 N D <br />'Ethyl Benzene 00050 N D <br /> Xylenes (Total) 00050 N D <br /> Chromatogram Pattern <br /> Unidentified HC C6-C12 <br />'Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 95 <br /> 4-Bromofluorobenzene 60 140 102 <br /> i <br /> 1 <br /> 1 <br /> Lal <br /> ytes reported as N D were not present above the stated limit of detection <br /> OMA ANALYTICAL - ELAP #1210 <br /> 1 r s <br />?rojec anager Page 17 <br />