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Sequoia 680 Chesapeake Dnve 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 /> INV— <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95634 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysis, Inc Client Proj ID 95-163 Knowles Roek Sampled 03/16/98 <br /> 1714 Main St Sample Descript KR Influ Received 03/17/98 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 03/19/98 <br /> Attention Justin Powers Lab Number 9803929-01 <br /> Reported 03J30f98 <br /> OC Batch Number GC031-998BTEX02A <br /> Instrument ID GCHP2 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 500 1900 <br /> Benzene 5 0 N D <br /> Toluene 5 0 87 <br /> Ethyl Benzene 5 0 29 <br /> Xylenes (Total) 5 0 150 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits% % Recovery <br /> Tri luorotoluene 70 130 109 <br /> � I <br /> i <br /> I <br /> 6 <br /> E <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQU A LYTICAL - ELAP #1210 <br /> I <br /> v <br /> er <br /> *tt-ager Page 1 <br /> I <br /> ,fig, I <br /> .Pg. <br /> F <br />