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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX;415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytlea1 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EA Engineering Science&Tech Client Prol Ib--_ ES&on 7-0137, 5150137 1300 Sampled 04/01/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descrlpt Trip Blank Received 04/02/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/08/97 <br /> Attention Christa Martmg Lab Number 9704171-01 Reported 04/14/97 <br />'QC Batch Number GC0408976TEX21A <br /> instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br />' Analyte Detection Limit Sample Results <br /> ug/L ug/L. <br />' TPPH as Gas 50 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 050 N D <br />' Xylenes (notal) 0 50 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br />' Trlfluorotoluene 70 130 105 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> FEQUOIA ANALYTICAL - ELAP 41210 <br />?, Follett <br /> ct Manager <br /> Page 1 <br />