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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 CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysis, Inc Client Proj ID Knowles Rock Sampled 06/15/98 <br /> 1714 Main St Sample Descript KR Efflu Received 06/16/98 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 06/16/98 <br /> Attention Jeanne Buelethal Lab Number 9806A65-02 Reported 06119f98 <br /> QC Batch Number GC061698BTEX17A <br /> Instrument ID GCHP17 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 10 N D <br /> Benzene 010 1 9 <br /> Toluene 010 070 <br /> Ethyl Benzene 010 014 <br /> Xylenes(Total) 010 058 <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 98 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> Project Manager Page 2 <br /> I <br /> L r <br />