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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D <br /> (9 16)921-9mo <br /> wo AnalyticalFAX(916)921-0100 <br /> www sequoialabs cam <br /> i <br /> Gettler-Ryan-Dublin Project Chevron 9-6258,Stockton,CA Sampled 4/24/00 <br /> 6747 Sierra Court,Ste 7 Project Number 386844 Received 4/26/00 <br /> Dublin,CA 94568 Project Manager Deanna L Harding Reported 5110100 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050037 Date Prepared 51210.0 Extraction Method: RPA 5030B IP/Tl <br /> Blank 0050037-BLKI <br /> Tert-butyl alcohol 5/2/00 ND ug/1 200 <br /> Methyl tert-butyl ether ND It200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 <br /> Ethanol " ND It <br /> 3000 <br /> Surrogate 1,2-DCA-d4 0 500 580 600-140 116 <br /> Blank 0050037-BLK2 <br /> Tert-butyl alcohol 513/00 ND ug/l 200 <br /> Methyl tert-butyl ether OF91ND2 00 <br /> Di-isopropyl ether I. ND 200 <br /> Ethyl tert-butyl ether ND 200 • <br /> Tert-amyl methyl ether ND " 200 <br /> Ethanol ND 3000 <br /> Surrogate 1,1-DCA-d4 00 500 614 600-140 125 <br /> LCS 0050037-BSI <br /> Methyl tert-butyl ether 5/2/00 50 0 514 ug/1 700-130 103 <br /> Surrogate 1,2-DCA-d4 OF 500 568 It 600-140 114 <br /> Matrix Spike 0050037-MS1 5004320-01 <br /> Methyl tent-butyl ether 5/2/00 500 143 744 ug/l 600-140 120 <br /> Surrogate 1,2-DCA-d4 IF 50 0 616 to 600-140 123 <br /> Matrix 5 ike Dup 0050037-MSP I S004320-01 <br /> Methyl tert-butyl ether 5/2/00 500 143 724 ug/1 600-140 116 25 0 339 <br /> Surrogate 1,1-DC4-d4 500 590 IF600-140 118 <br /> • <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 7 of 9 <br />