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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Crrck CA 94598 (5t0) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9i6) 921 9600 FAX(916) 921 0100 <br /> " EA Engineering Science &Tech µ Client Prol-ID Exxon 7-0137, 51501 37 1300 Sampled 01/14/98 -- <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW5 Received 01/15/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/B020 Analyzed 01/28/98 <br /> Attention Christa Marting_ Lab Number 9801803-05 _ 13eported O1J30198_ <br /> kstruC Batch Number GC012898BTEX06A <br /> -ml <br /> erit ID GCHP6 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />'TPPH as Gas 50 100 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> fri,dS <br /> ent,fiod HC C6-C8 <br /> urrogates Control Limits % % Recovery <br /> Tr[fluorotoluene 70 130 76 <br /> 1 <br />(alytes reported as N D were not present above the stated limit of detection <br /> EQUOIA ANALYTICAL - ELAP 41210 <br /> rardng <br /> ject ge <br /> Manager Page 5 <br />