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Sequoia 680 Chesapeake Drive Redwood City,CA 9443` (415) 364-9600 FAX(415) 364.9233 404 N.Wiser lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 X117 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 Pac'Ific Environmental Group Client Project ID: Unocal #1205, Lathrop, CA, Sampled. " Nov 18, 1997 11315 Sunrise Gold Circle, Ste. M Sample Descript: Water, Tank Received: Nov 19, 1997 Rancho Cordova, CA 95742 Analysis Method: EPA 5030/8240 Analyzed: Nov 26, 1997- Attention Rusty Benkosky Lab Number 711-1173 Reported: Dec 1, 1997` K. VOLATILE ORGANICS by GC/MS (EPA 8240) Analyte Reporting Limit Sample Results Ng/L Ng/L Acetone............................................................................. 500 ..................................... N.D. Benzene..................................................................... 100 ..................................... 190 Bromodichloromethane.................................................... 100 ..................................... N.D. Bromoform........................................................................ 100 ...........I......................... N.D. Bromomethane................................................................. 100 ..................................... N.D. 2-Butanone........................................................................ 500 ..................................... N.D. Carbondisulfide................................................................ 100 ..................................... N.D. Carbontetrachloride......................................................... 100 ..................................... N.D. Chlorobenzene.................................................................. 100 ..................................... N.D. Chloroethane..................................................................... 100 ..................................... N.D. 2-Chloroethyl vinyl ether................................................... 500 ..................................... N.D. Chloroform........................................................................ 100 ..................................... N.D. Chloromethane................................................................. 100 ..................................... N.D. Dibromochloromethane.................................................... 100 ..................................... N.D. 1,1-Dichloroethane............................................................ 100 ..................................... N.D. 1,2-Dichloroethane............................................................ 100 ..................................... N.D. 1,1-Dichloroethene............................................................ 100 ..................................... N.D. cis-1.2-Dichloroethene...................................................... 100 ..................................... N.D. trans-1,2-Dichloroethene.................................................. 100 ..................................... N.D. 1,2-Dichloropropane......................................................... 100 ..................................... N.D. cis-1,3-Dichloropropene................................................... 100 ..........I.......................... N.D. trans-1,3-Dichloropropene................................................ 100 ..................................... N.D. Ethylbenzene..................................................................... 100 ..................................... N.D. 2-Hexanone....................................................................... 500 ..................................... N.D. Methylene chloride............................................................ 250 ..................................... N.D. 4-Methyl-2-pentanone....................................................... 500 ..................................... N.D. Styrene.............................................................................. 100 ..................................... N.D. 1,1,2,2-Tetrachloroethane................................................. 100 ..................................... N.D. Tetrachloroethene............................................................. 100 .................................. N.D. Toluene...................................................................... 100 ..................................... 1,300 1.1,1-Trichloroethane........................................................ 100 ..................................... N.D. 1.1.2-Trichloroethane........................................................ 100 ..................................... N.D. Trichloroethene................................................................. 100 ..................................... N.D. Trichlorofluoromethane.................................................... 100 ..................................... N.D. Vinylacetate...................................................................... 100 ..................................... N.D. Vinylchloride..................................................................... 100 ..................................... N.D. TotalXylenes ............................................................. 100 ..................................... 5,600 MTBE.......................................................................... 250 ..................................... 7,300 Analytes reported as N.D.were not detected at or above the reporting limit. Because matrix effects and/or other factors required additional sample dilution,reporting limits for this sample have been raised. SEQUOIA ANALYT AL, EPA#1624 inda C. Sch6eider Project Manager/Sacramento Laboratory / 7111173.PES <1- e