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Sequoia 690 Chesapeake Drive Redwood City Ca 94063 f4[5` 364 9600 FAX(415) 364 9:33 <br /> 404 N Wiget Lane Walnut Cre--k CA 94593 (510) 988 9600 FAX(510) 988 9,573 <br /> Analytical 919 Striker Avenue Suite 8 Saeramcnto CA 93934 (9[6) 921 9600 FAX(916) 921 OtOO <br /> 1 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942/8373942 1307 Sampled 10/19/95 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descnpt 3942 MW9NP Received 10/20/95 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/24/95 <br /> Attention Tracy Faulkner Lab Number 951 OF27-10 Reported 10127/95 <br /> QC Batch Number GC102495BTEX2IA <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 2500 17000 <br /> Benzene 25 2300 <br /> Toluene 25 870 <br /> Ethyl Benzene 25 400 <br /> Xylenes (Total) 25 1600 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 82 <br /> i <br /> 1 <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> tSEQUO A AL CAL - ELAP #1210 <br /> L _ /' --- <br /> ggy Penn <br /> Protect Manager Page 10 <br />