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_ Sequoia 1551 IndusMal Road <br /> ,!D _ 5an Carlos, CA 94070-411 1 <br /> Analytical - (650) 232-9600 - <br /> FAX(650) 232-9012 <br /> Gettler-Ryan/Geostramegres Project Tosco Sampled 4/I0/00 <br /> 6747 Sierra Court,Suite D Project Number• Unocal SS#1205 Received 4/10/00 <br /> Dublin,CA 94568 Project Manager Deanna Hardin Reported. 4/24/00 <br /> Sample Description: - -- -- -- -- - -MW4------ - - - — — --- - - <br /> Laboratory Sample Number: L004097-05 <br /> Batch Date Date Specific Method/ Reporting <br /> Anal Number Prepared Anal Surro ate Limits Limit Result Units Notes* <br /> Senuola Analytical-San Carlos <br /> Total Pur eable A drocarbons C6-C12 BTEX and MTBE by DHS LUFT <br /> Purgeable Hydrocarbons as Gasoline 0040080 4/17/00 4118/00 50 0 ND ug/1 <br /> Benzene " 0 500 ND It <br /> Toluene 0 500 ND " <br /> Ethylbenzene 0 500 ND " <br /> Xylenes(total) n It 0 500 ND It <br /> Methyl tent butyl ether _ 500 ND _ <br /> Surrogate a,a,a-Trifleorotoluene - 700-136 90 7 <br /> Volatile Organic Compounds,by EPA Method 8260A y <br /> Ethanol 0040056 4112/00 4112100 1000 ND u9/1 <br /> Di-isopropyl ether if 200 ND It <br /> Ethyl teat-butyl ether TM 200 ND it <br /> Methyl tert butyl ether " It " 200 ND " <br /> Tert-amyl methyl ether It It 200 ND It <br /> Tert-butyl alcohol 1100 ND " <br /> Surrogate 1,2 Dichloroethane-& " " " 760-114 974 % <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> Page 6 of 1 I <br />