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Sequoia 819 Striker Avenue,suite 8 <br /> Sacramento, CA 95834 <br /> D- Analytical {916) 921 9600 <br /> FAX(916)921-0100 <br /> 0 <br /> EMCON/IT-Sacramento Project ARCO 2130,Stockton,CA Sampled 3116100 <br /> 1433N Market Blvd,#l Project Number 803879 Received 3117100 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 3124100 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Qiiality 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 0030237 Date Prepared 3123/00 Extraction Method EPA 5030E(P/TI <br /> Blank 0030237-BLKI <br /> Tert-butyl alcohol 3/23100 ND ug/l 200 <br /> Methyl tert-butyl ether ND 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 <br /> Ethanol ND 3000 <br /> Surrogate 12-DCA-d4 500 552 600-140 110 <br /> LCS 0030237-BSI <br /> Methyl tert-butyl ether _ 3/23/00 500 _ _ 476 ug/l 700-130 952 <br /> Surrogate 12-DCA-d4 " 500 54 6 600-140 109 <br /> LCS Dup _ 7-BSD1 -----51 <br /> —— - <br /> Methyl tert-butyl ether 3/23/0 3123/00 500 _51 4 ug/1 70_0-t30 _103 25 0 787 87 <br /> Surrogate 1,2-DCA-d4 11 500 566 600-140 113 <br /> Matrix Spike 0030237-MSI 5003240-01 <br /> Methyl Cert-butyl ether_ 3123/00 500 ND 524 _ ug/l 600-140 10_5 <br /> Surrogate 12-DCA-d4 ot 50 0 544 600-14o 109 <br /> Matrix Spike Dup 0030237-MSD1 5003240-01 <br /> Methyl tent-butyl ether 3/23100 500 ND 494 ug/l 600-140 98 825 0 _ 6 08 <br /> Surrogate 1,2-DCA-d4 11 500 558 11600-140 112 <br /> Batch 0030239 Date Prepared 3124100 Extraction Method EPA 5030B [P/TI <br /> Blank 0030239-BLKI <br /> Tert-butyl alcohol 3/24/00 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2 00 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 <br /> Tert-amyl methyl ether ND 200 <br /> Ethanol ND 3000 <br /> Surrogate 12-DCA-d4 50 0 _ 55 2 600-140 110 <br /> LCS 0030239-BSI <br /> Methyl tert-butyl ether _ 3124/00 500 _ 478 ug/l 700-130 956 <br /> Surrogate 12-DCA-d4 11 500 562 600-140 112 <br /> LCS Dup 0030239-BSDI <br /> Methyl tert-butyl ether 3124100 500 494 ug/l 700-130 988 250 3 29 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text of notes and definitions <br /> Page 7 of 9 <br />