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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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> r <br /> Ground Zero Analysis, Inc Client Pro 1D 95-163 Knowles Roek Sampled 03/16/98 <br /> 1714 Main St y Sample Descrlpt KR Efflu Received 03/17/98 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 03/20/98 <br /> Attention Justin Powers Lab Number 9803929-02 _ _ Reported 03/30198 <br /> OC Batch Number GC432098BTEX02A <br /> Instrument ID GCHP02 � <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 50 360 <br /> Benzene 0 50 4 6 <br /> Toluene 050 3 1 <br /> Ethyl Benzene 050 1 4 <br /> Xylenes (Total) 050 89 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 98 <br /> I <br /> I <br /> Analytes reported as N were not present above the stated limit of detection <br /> SE+DUO YT'CAL FLAP #1210 <br /> I <br /> I <br /> I <br /> e er <br /> Ct anager Page 2 <br />