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Sequoia 680 Chesapeake Drive Redwood City,CA 940 (415) 364-9600 FAX(415) 364-9233 <br /> rti/^ 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0 100 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 7/28/98 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 7/28/98 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosk Reported: 8/11/98 <br /> Total Purgeable Hydrocarbons(C6-02),BI EX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> OW-1 S807330-QI Water <br /> Purgeable Hydrocarbons 8080053 8/4/98 8/4/98 50.0 ND ug/1 <br /> Benzene " " " 0.500 ND " <br /> Toluene 0.500 ND <br /> Ethylbenzene 0.500 ND <br /> Xylenes(total) 0.500 ND " <br /> Methyl tent-butyl ether 5.00 ND " <br /> Surrogate: a,a,a-Tris luorotoluene 60.0-140 87.8 % <br /> OW-2 S807330-01 Water <br /> Purgeable Hydrocarbons 8080035 8/4/98 814198 50.0 ND ug/l <br /> Benzene 0.500 ND " <br /> Toluene 0.500 ND " <br /> Ethylbenzene 0.500 ND " <br /> Xylenes(total) 0.500 ND " <br /> Methyl tert-butyl ether 5.00 52.4 " <br /> Surrogate: a,a,a-Trifluorotoluene 60.0-140 94.0 % <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> #,d, chneider,Laboratory Director ., Page 2 J5 <br />