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(i) 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 /> IIIA Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Obuchstone Developments Client Project 10 Chevron #9-4183 Sampled Apr 26, 1996 <br /> 781 Kingston Ave Sample Descript S011, WOX-2-16 0 Received Apr 26, 1996 <br /> Oakland, CA 94611 Analysis Method EPA 5030/8010 Analyzed May 1, 1996 <br /> Attention Robert Mallory Lab Number 604-1944 Reported May 6, 1996 <br /> QC Batch Number GCO50196801007A <br /> Instrument ID HP-7 <br /> HALOGENATED VOLATILE ORGANICS (EPA 8010) <br /> Analyte Detection Limit Sample Results <br /> Ng/kg Ng/kg <br /> Bromodichloromethane 50 N D <br /> Bromoform 50 N D <br /> Bromomethane 10 N D <br /> Carbon tetrachloride 50 N D <br /> Chlorobenzene 50 N D <br /> Chloroethane 10 N D <br /> 2-Chloroethylvinyl ether 10 N D <br /> Chloroform so N D <br /> Chloromethane 10 N D <br /> Dibromochloromethane 50 N D <br /> 1,2-Dichlorobenzene 50 N D <br /> 1,3-Dichlorobenzene 50 N D <br /> 104-Dichlorobenzene 50 N D <br /> 1-Dichloroethane 50 N D <br /> 2-Dichloroethane so N D <br /> 1,1-Dlchloroethene 50 N D <br /> cis-1,2-Dichloroethene 50 N D <br /> trans-1,2-Dlchloroethene 50 N D <br /> 1,2-Dichloropropane 50 N D <br /> cis-1,3-Dichloropropene 50 N D <br /> trans-1,3-Dichloropropene 50 N D <br /> Methylene chloride 50 N D <br /> 1,1,2,2-Tetrachloroethane 50 N D <br /> Tetrachloroethene 50 N D <br /> 1,1,1-Trichloroethane 50 N D <br /> 1,1,2-Trichloroethane 50 N D ` <br /> Trichloroethene 50 N D <br /> Trichlorofluoromethane 50 N D <br /> Vinyl chloride 10 N D <br /> Surrogates Control Limit % % Recovery <br /> Dibromodifluoromethane 50 150 42* <br /> 4-Bromofluorobenzene 50 150 91 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL, #1271 Please Note <br /> " Surrogate recovery outside control limits due to matrix Interference <br /> Kevin Van Slambrook <br /> Project Manager <br /> 6041944 TUD <4> <br />