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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)921-9600 1-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs corn <br /> Stratus Environmental Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 ProjectNumbet- 2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 06/25/02 14 07 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %1LEC Limits RPD Limit Notes <br /> Batch 2060275-EPA 5030B [P/T] <br /> Blank(2060275-BLKI) Prepared&Analyzed 06/21/02 <br /> Tert-butyl alcohol ND 50 ug/I <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> Ter-amyl methyl ether ND 050 " <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane ND 050 " <br /> Surrogate 12-DCA-d4 271 250 108 60-140 <br /> LCS(2060275-BSI) Prepared&Analyzed 06/21/02 <br /> ethyl tert-butyl ether 986 050 ug/l 109 90 60-140 <br /> rrogate 12-DCA-d4 27 7 250 111 60-140 <br /> Matrix Spike(2060275-MS1) Source S206259-02 Prepared&Analyzed 06/21/02 <br /> Methyl tert-butyl ether 115 050 ugll 109 20 87 60-140 <br /> Surrogate 1 2-DCA-d4 255 " 250 102 60-140 �� <br /> Matrix Spike Dup(2060275-MSDI) Source S206259-02 Prepared&Analyzed 06/21/02 <br /> Methyl tert-butyl ether 124 050 ug/l 109 20 95 60-140 8 25 <br /> Surrogate 1 2-DCA-d4 273 250 109 60-140 T T --- - <br /> Batch 2060282 -EPA 5030B [PIT] <br /> Blank(2060282-BLKI) Prepared&Analyzed 06/24/02 <br /> Tert-butyl alcohol ND 50 ug/l <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 0 50 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 050 <br /> Surrogate 12-DCA-d4 283 2.)0 --- 113 60-140 <br /> equoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document nzs analytical i eport niust be reproduced in its entirety <br /> Page I 1 of 13 <br /> / <br />