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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 Surte 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysis, Inc Client Prod 1D 96-163/Knowles Rock Sampled 11/04/97 <br /> 1714 Main St Sample Descnpt KR Eff Received 11/04/97 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 11/05/97 <br /> _ <br /> Attention�GrYe Stahl __ - Lab Number 9711038-02 Reported 11106197 <br /> - :ter x — ai'",_�wi r-- <br /> - _ - <br /> QC Batch Number GC1 10597BTEX21 A I <br /> Instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> i Analyte Detection Limit <br /> � Sample Results <br /> e�esults <br /> ug/L i <br /> TPPH as Gas 100 150 <br /> Benzene 1 0 3 9 <br /> Toluene 1 0 84 <br /> Ethyl Benzene 1 0 1 a I <br /> Xylenes (Total) 1 0 88 <br /> Chromatogram Pattern Gas <br /> t <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 105 <br /> 1 <br /> I <br /> i <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUO LYTICA - ELAP #121a <br /> t <br /> g <br /> z <br /> gy Penner <br /> affect Manager U JJ Page 2 <br />� I <br /> AXA <br /> f <br />