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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> IW FAX equot labs co 0 <br /> www sequoislabs cam <br /> SECOR International-Rancho Cordova Project ARCO 434,Lodi,CA <br /> 3017 Kilgore Road,Suite 100 Protect N—ber 434,Lodi,CA Reported <br /> Rancho Cordova CA,95670 Project Manager' Rusty Benkosky 01/08/0217 26 <br /> MTBE by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 1120325-EPA 5030B[P/TI <br /> Blank(1120325-BLK1) Prepared&Analyzed I2/28/01 _ <br /> Methyl tert-butyl ether ND 050 ug/1 <br /> Surrogate 12-DCA-d4 275 250 110 60-140 <br /> LC5 1120325-BSi Prepared&Analyzed 12/28/01 <br /> Methyl tert-butyl ether 25 7 050 ug/l 25 0 103 70-130 <br /> Surrogate 1,2-DCA-d4 281 250 112 60-140 <br /> Matrix Spike 1120325-MS1Source 5112225-02 Prepared&Anal ed 12/28/01 <br /> Methyl tort-butyl ether 23 8 050 1191/ 250 ND 952 60-140 <br /> Surrogate 1,2-DCA-d4 266 " 250 106 60-140 <br /> Matrix Spike Duip(1120325-MSD1) SourceS112225-02 Prepared&Analyzed 12/28/01 <br /> ethyl tert-butyl ether 25 1 050 119/1 250 ND 100 60-140 5-32 25 <br /> IqWpurrogate 1,2-DC-444 284 250 114 60-140 <br /> Batch 2010063-EPA 5030B [P/TI <br /> Blank(2010063-BLKII Prepared&Anal 01/07/02 <br /> Methyl tert-butyl ether ND 050 ug/l <br /> Surrogate 1,2-DCA-d4 .262 " 250 105 60-140 <br /> LCS(2010063-BSI)_ Prepared&Analyzed 01/07/02 <br /> Methyl tert-butyl ether 23 1 050 U84 250 924 70-130 <br /> Surrogate 1,2-DCA-d4 257 250 103 60-140 <br /> Matrix Spike(2010063-MSI) Source S112392-07 Prepared&Analyzed 01/07/02 <br /> Methyl tert-but 1 ether 21 8 0 50 a 25 0 ND 8 2 -_— <br /> y y g/t 7 60-140 <br /> Surrogate 1,2-DCA-d4 259 250 104 60-140 <br /> cola Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> ofeustody document This analyhcal report must be reproduced in its entirety <br /> Page Page 7 of 10 <br />