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' Sequoia 680Chesapeake Drive Redwood City 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)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> EA Engineering Science &Tech Client Prol ID Y -Exxon 7-3942, 5753942 1300 ^ Sampled 05%20/98 -� <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW3 Received 05/21/98 <br /> Lafayette, CA 94549 Matrix LIQUID X <br /> Analysis Method 8015Mod/8020 Analyzed 06/03/98 _ <br /> Attention Chnsta Marting Lab Number 9805E41-02 Reported 06j10j98 <br />'QC Batch Number GC060398BTEX02A- <br /> Instrument ID GCHP02 <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 s0 .. 170 <br />' Methyl t-Butyl Ether - - 25 N D <br /> Benzene 0.50 -- - 14 <br /> Toluene 050 ND <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 154 Q <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01210 <br /> andHerling <br /> ect Manager <br /> Page 4 <br /> r <br />