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819 Striker Avenue Suite 8 <br /> 21-9600 <br /> 41� FAX(gi6)921-0100 Sacramento )9 95834 <br /> Sequoia <br /> Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/02 11 28 <br /> BTEX by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060151 -EPA 5030E [P/TJ <br /> Blank(2060151-BLK1) Prepared 06/13/02 Analyzed 06/14/02 <br /> Ethanol ND 50 ug/l <br /> Tert-butyl alcohol ND 5 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> Benzene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Gasoline(C6-C 10) ND 50 <br /> urrogate Toluene d8 252 250 101 60-140 <br /> Surrogate 4-BFB 318 250 117 60-140 <br /> Surrogate 1 2-DCA-d4 290 250 116 60-140 <br /> LCS(2060151-BSI) Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tert-butyl ether 520 050 ugtl 5 45 95 60-140 <br /> Benzene 325 050 3 35 97 70-130 <br /> Toluene 173 050 202 86 70-130 <br /> Gasoline(C6-C 10) 223 50 275 81 70-130 <br /> Surrogate Toluene-d8 244 250 98 60-140 <br /> Surrogate 4-BFB 31 2 250 125 60-140 <br /> Surrogate 12-DCA-d4 289 250 116 60-140 <br /> Matnx Spike(2060151-MSI) Source 5206079-15 Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tert-butyl ether 550 050 ugll 545 ND 101 60-140 <br /> Benzene 343 050 3 35 ND 102 70-130 <br /> Toluene 18 2 050 202 ND 90 70-130 <br /> Gasoline(C6-C 10) 243 50 275 ND 88 60-140 <br /> Surrogate Toluene-d8 249 25 0 100 60-140 <br /> Surrogate 4-BFB 31 1 250 128 60-140 <br /> Surrogate 12-DCA-d4 294 25 0 118 60-140 <br /> Sequoia Analytical-Sacramento The remlts in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 10 of 12 <br />