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' Sequoia t 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 ' Pacific Environmental Group-Sac Project Unocal 0123,Tracy,CA Sampled 10/22/98 11315 Sunnse Gold Circle St M Project Number 910-017 1 A Received 10/22/98 Rancho Cordova,CA 95742 Project Manager Mike Mitchener Reported 10/30/98 ' Volatile Organic Compounds by EPA Method 8010B Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* S810250-01 wate Bromodichi oromethane 8100315 10/27/98 10/27/98 0 500 ND ug/l Bromoform 0 500 ND " Bromomethane " ;i " 1 00 ND Carbon tetrachloride 0 500 ND " Chlorobenzene 0 500 ND Chloroethane 100 ND " ' 2-Chloroethylvinyl ether " 100 ND " Chloroform 0 500 ND " Chloromethane 100 ND Dibromochloromethane 0 500 ND " ' 1,3-Dichlorobenzene " 0 500 ND 1,4-Dichlorobenzene 0 500 ND 1,2-Dichlorobenzene 0500 ND " �i-Dichloroethane 0 500 ND " ?-Dichloroethane " 0 500 ND " 1,1-Dichloroethene 0 500 ND cis-1,2-Dichloroethene 0 500 ND ' trans-l,2-Dichloroethene " 0 500 ND 1,2-Dichloropropane 0 500 ND cis-1,3-Dichloropropene 0 500 ND " ttrans-l,3-Dichloropropene 0 500 ND Methylene chloride " 500 ND " 1,1,1,2-Tetrachloroethane 0 500 ND Tetrachloroethene 0 500 250 ' 1,1,1-Trichloroethane 0 500 ND " 1,1,2-Trichloroethane 0 500 ND " Trichloroethene 0 500 ND " Trichlorofluoromethane 0 500 ND " 'Vinyl chloride 100 ND " Surrogate Bromochloromethane " 700-130 870 % Surrogate 2-Chlorotoluene 700-130 710 1 1 'equoia alytical-Sacramento *Refer to end of report for text of notes and definitions r WIN n C Schneid r,Laboratory Director Page 5 of 12