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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wig&lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> (D— <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WD8 Services Client Project ID Unocal#6981 4707 Pacific Ave,Stockton Sampled Oct 15, 1997 <br /> 2401 Stanwell Dr, Ste 300 Sample Descript Water, VW-1 Received Oct 16, 1997 <br /> Concord, CA 94520 Analysis Method EPA 8260 Analyzed Oct 29, 1997 <br /> Attention Jarrell Crider Lab Number 710-1209 Reported Oct 31, 1997 <br /> VOLATILE ORGANIC COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> N4/L Jug/L <br /> MTBE 20 N D <br /> Surrogates Control Limit% %Recovery <br /> Dlbromofluoromethane 50 150 101 <br /> I <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection Because matrix effects and/or other factors <br /> required additional sample dilution, detection limits for this sample have been raised <br /> Oignatlre <br /> UOIA ANALYTICAL, #1271 <br /> on File <br /> Jim Bava <br /> Protect Manager <br /> 7101203 MPD <10> <br />