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Striker Avenue Suite 8 <br /> Sequoia 819Sacramento CA 95834 <br /> (916) 921-9600 <br /> Analytical FAX(916)921-0100 <br /> EMCON/Pmnacle-Cameron Park Project ARCO 6100 Tracy,CA Sampled 8119/99 <br /> 3939 Cambridge Road,Ste 220 Project Number 797615 Received 8120/99 <br /> Cameron Park,CA 95682 Project Mana er Mark Ca ps Reported 8/27/99 <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 Anal zed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch, 9080207 Date Prepared. 8124194Extraction Method.--EPA 5030B[FM <br /> Bla11k 9080207-SLK/ <br /> Tert-butyl alcohol 8/25199 ND ug/l 200 <br /> Methyl tert-butyl ether ND " 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 2 00 <br /> Tert-amyl methyl ether ND " 2 00 <br /> Ethanol ND 3000 <br /> Surrogate 1 2-DCA-d4 500 53 0 600-140 106 <br /> LCIS S 9080207-BS 1 <br /> Methyl tert-butyl ether 8/25199 500 548 ug/1 700-130 110 <br /> Surrogate 1,2-DCA-d4 " 500 576 It 600-140 115 <br /> ethyl ttt-butyl ether 8125/99 500 556 ug/l 700-130 Ill 250 0 905 <br /> Surrogate 1,2-DCA-d4 to500 568 600-140 114 <br /> Matrix Spike 9080207-MSI S908237-01 <br /> Methyl tert-butyl ether 8/25/99 Soo ND 51 0 ug/1 600-140 102 <br /> Surrogate 1,2-DCA-d4 Fol500 530 to 600-140 106 <br /> Matrix pike Spike 9080207-MSD1 5908237-01 <br /> Methyl tert-butyl ether 8/25/99 500 ND 528 ug/1 600-140 106 250 3 85 <br /> Surrogate 1,2-DCA-d4 " 500 552 It 600-140 110 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text of notes and definitions <br /> Page 5 of 6 <br />