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' 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(9Z5)988-9673 819 Striker Avenue Suite 0 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 Analytical 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 Sunrise 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* U--fi 1;810250-02 Water Bromodichloromethane 8100315 10/27/98 10/27/98 0 500 ND ugll Bromoforin 0 500 ND " ' Bromomethane 100 ND " Carbon tetrachloride 0 500 ND I' Chlorobenzene 0 500 ND Chloroethane 100 ND " ' 2-Chloroethylvinyl ether 1 00 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 0 500 ND Dichloroethane 0 500 1 18 " -Dichloroethane " " 0 500 ND 1- D " 1,1-Dichloroethene 0 500 ND " cis-1,2-Dichloroethene 0 500 2 " trans-l,2-Dichloroethene " 0 500 ND " 1,2-Dichloropropane 0 500 ND cis-1,3-Dichloropropene 0500 ND 'trans-1,3-Dichloropropene 0 500 ND " Methylene chloride " 5 00 ND 1,1,1,2-Tetrachloroethane 0 500 18 Tetrachloroethene 0 500 5' D "1,1,1-Tnchloroethane " " 0500 ND 1,1,2-Tnchloroethane 0 500 ND " Trichloroethene 0 500 l OS Trichlorofluoromethane 0 500 ND " 'Vinyl chloride 1 00 ND Surrogate Bromochloromethane 700-130 108 Surrogate 2-Chlorotoluene 700-130 760 Pr Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions 1 Page 6 of 12 inda C Schnei er,Laboratory Director — 1