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Sequoia 680 Chesapeake Drive Redwood Gry CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wcget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 815 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysis, Inc Client Prol ID 96-163, Knowles Roek Sampled 03/27/98 <br /> 1714 Main St Sample Descrlpt KR Influ Received 03/27/98 <br /> Escalon CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 03/28/98 <br /> Attention Greg Stahl Lab Number 9803103-03 Reported 03130J98 <br /> QC Batch Number G0032898BTEX03A <br /> Instrument 1D GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 200 2900 <br /> Benzene 20 10 <br /> Toluene 2 0 120 <br /> Ethyl Benzene 20 48 <br /> Xylenes (Tota!) 20 220 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 1330 <br /> I <br /> Analytes reported as N D were not pr sent above the stated limit of detection <br /> SEQUOI L ICA - ELAP #1210 <br /> i <br /> ' I <br /> 5 <br /> I <br /> 1y Penner <br /> 1'ect Manager Page 3 <br />