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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> 4 (916)921-96M <br /> Analytical FAX(916)921-0100 <br /> 1T Corporation-Sacramento Project Tosco 4409,Stockton,CA Sampled 1219199 to 12/10/99 <br /> 1433N Market Blvd,Ste 1 Proj ect Number 911-011 1B Received 12/13/99 <br /> Sacramento,CA 95834 Project Manager Mark Capps Reported 12/21/99 <br /> MTBE Confirmation by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Anal zed Level Result Result Units Recov Limits % Limit °Yo Notes; <br /> Batch 9120209 Date Prepared 12/16/99 Extraction Method EPA 5030B FMeQH <br /> Blank 9120209-BLKI , <br /> Methyl tert-butyl ether 12/16/99 ND mg/kg 0 100 <br /> Surrogate 1,2-DCA-d4 250 217 600-140 868 <br /> LCS 9120209-BSI <br /> Methyl tert-butyl ether I2/16/99 250 <br /> 2 50 mg/kg 70 6-130 100 <br /> Surrogate 12-DCA-d4 It250 258 If 600-140 103 <br /> Matrix Spike 9120209-MS1 S912145-13 <br /> Methyl tert-butyl ether 12/16/99 250 ND 247 mg/kg 600-140 988 <br /> Surrogate 1,2-DCA-d4 F, 250 246 600-140 984 <br /> Matrix Spike Dup 9120209-MSDi S912I45-13 <br /> Methyl tert-butyl ether 12/16/99 250 ND 255 mglkg 600-140 102 250 3.19 <br /> rogate 1,2-DCA-d4 „ 250 244 if600-140 976 <br /> quoia Analytical-Sacramento *Refer to end of report far text of notes and definitions <br /> Page 10 of 13 <br />