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' p y 819 Striker Avenue Suite 8 4 a- ) Sequoia Sacramento CA 95834 (916)921-9600 Analytical FAX(916)921-01 00 EMCON/Pinnacle-Sacramento Project ARCO 2130,Stockton,CA Sampled 912199 1433 N Market Blvd Project Number 21775-229 003 Received 9/3/99 Sacramento,CA 95834 Project Manager Dave Foley Reported 9120199 Volatile Oxygenate Compounds by EPA Method 8260AIQuahty Control Sequoia Analytical-Sacramento Date Spike Sample QC Reporting Limit Recov RPD RPD lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* Batch. 9020043 Date Prepared, 917199 Rxtrarfion Method, EPA 5030B [PIT) Blapg 9090043-BLK1 Tert-butyl alcohol 917199 ND Ug/1 200 Methyl tert-butyl ether ND 200 Di-isopropyl ether ND 200 Ethyl tert-butyl ether ND 200 Tert-amyl methyl ether ND 200 Ethanol ND 3000 Surrogate 1,2-DC4-d4 50 0 568 600-140 114 Blank 9090043-BLK2 Tert-butyl alcohol 918199 ND ugll 200 Methyl tent-butyl ether ND 200 Di-isopropyl ether ND " 200 Ethyl tert-butyl ether ND '' 200 y Y 1 methyl ether ND 200 at " ND 3000 Surrogate 1,2-DCA-d4 500 554 600-140 111 LLS 9090043-BS1 Methyl text-butyl ether 917199 500 53 0 ug/1 70 0-130 106 Surrogate 1,2-DCA-d4 " 500 566 600-140 113 Methyl teI t-butyl ether 9/7/9 0 520 ug/l 700-130 104 25 0 190 Surrogate 1,2-DCA-d4 " 50 0 56 6 600-140 113 Matrix Spike 9090043-MSI S9099Z.-01 Methyl tert-butyl ether 917199 500 ND 520 Ug/1 600-140 104 Surrogate 1,2-DCA-d4 !' 500 570 " 600-140 114 Matrix Spike Dun 9090043-MSDI S909029-01 Methyl tert-butyl ether 9/7/99 500 ND 506 Ug/1 60 0-140 101 25 0 2 93 Surrogate 1 2-DCA-d4 500 540 600-140 108 Batch, 9090114 Date Prepared. 9113199 Extraction Method, EPA 5030E IPITI Blank 9090110-BLK1 Tert-butyl alcohol 9113199 ND ug/l 200 Methyl tert-butyl ether ND 200 Di-isopropyl ether ND 200 Ethyl tent-butyl ether ND 200 Tert-amyl methyl ether ND 200 Aft to Analytical-Sacramento 'Refer to end of report for text of notes and definitions Page 10 of 12