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. <br /> Sequoia <br /> 1 oya 819 Striker Avenue Suite 8 <br /> J d.a 1 Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX equo alabs92 1 c 00 <br /> www sequolalabs com <br /> Stratus Environmental Project ARCO 6100,Tracy,CA <br /> 3330 Cameron Park Drive, Ste 550 Project Number 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 10/21/02 17 41 <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 2090241 -EPA 5030B [PIT] <br /> Blank(2090241-BLKI) Prepared&Analyzed 09/23/02 <br /> Ethanol ND 50 ugll <br /> Tert-butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 <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 050 <br /> oluene ND 050 <br /> nes(total) ND 050 <br /> asoline(C6-C10) ND 50 <br /> Surrogate Toluene-d8 244 250 98 60-140 <br /> Surrogate 4-BFB 235 250 94 60-140 <br /> Surrogate 12-DCA-d4 259 250 104 60-140 <br /> LCS(2090241-BSI) Prepared&Analyzed 09/23/02 <br /> Methyl tert-butyl ether 245 050 ug/l 21 8 112 60-140 <br /> Benzene 146 050 134 109 70-130 <br /> Toluene 800 050 810 99 70-130 <br /> Gasoline(C6-C10) 1030 50 1100 94 70-130 <br /> Surrogate Toluene-d8 241 250 96 60-140 <br /> Surrogate 4-BFB 241 250 97 60-140 <br /> Surrogate 1 2-DCA-d4 258 250 103 60-140 <br /> Matrix Spike(2090241-MSI) Source S209370-01 Prepared&Analyzed 09/23/02 <br /> Methyl tert-butyl ether 21 3 050 ug/l 218 ND 98 60-140 <br /> Benzene 145 050 13 4 ND 108 70-130 <br /> Toluene 810 050 81 0 ND 100 70-130 <br /> Gasoline(C6-C10) 978 50 1100 ND 89 60-140 <br /> Surrogate Toluene-d8 246 250 98 60-140 �T <br /> Surrogate 4-BFB 240 250 96 60-140 <br /> Surrogate 1 2-DCA-d4 222 250 89 60-140 <br /> quota Analytical-Sacramento The results 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 4 of 6 <br />