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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0]00 <br /> EMCON/1T-Sacramento Project ARCO 2130, Stockton,CA Sampled 3116/00 <br /> 1433 N Market Blvd,#1 Project Number 803879 Received 3117100 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 3/24/00 <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 /> LCS Dup fcontinued� 0030239-BSD1 <br /> Surrogate 1 2-DCA-d4 3/24/00 500 574 ug/l 600-140 115 <br /> Matrix Spike 0030239-MSI S003246-06 <br /> Methyt tert-butyl ether 3/24100 500 ND---- 502 ug/l _ 600-140 _ 100 — —__---- <br /> Surrogate 1 2-DCA-d4 500 T 548 606-140 110 <br /> Matrix Spike Dup 0030239-MSDI 5003246-06 <br /> Methyl tert-butyl ether 3124100 500 ND 494 ug/l 600-140 .988 250 121 <br /> Surrogate 12-DCA-d4 500 f 562 600-140 112 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 8 of 9 <br />