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1 <br /> Sequoia 680 Chesapeake Dnve Redwood Crty 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 /> I <br /> Ground Zero Analysis, Inc Client Proj ID Knowles Rock Sampled 06/15/98 <br /> 1714 Main St Sample Descript KR Influ Received 06/16/98 <br /> Escalon, CA 95320 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 06/16/98 <br /> Attention Jeanne 8uelethal Lab Number 9806A65-01 Reported 06/19/98 <br /> QC Batch Number GC061698STEX1-7A <br /> Instrument lD GCHP17 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 100 1300 <br /> Benzene 1 0 47 <br /> Toluene 1 0 44 <br /> Ethyl Benzene 1 0 20 <br /> Xylenes (Total) 1 0 120 <br /> Chromatogram Pattern <br /> Gas& Unidentified HC C6-C12 <br /> Surrogates Control Limits% % Recovery <br /> Trrfluorotoluene 70 130 202 Q <br /> Rece,VeJ7 <br /> JUN 2 6 1998 <br /> ins"d, <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL -, ELAP #1210 <br /> Project Manager Page t <br /> I <br />� r� <br />