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1551 Indusinal Road <br /> Sequoia Sen Carlos� 0 <br /> (650)23 2-960-9600 <br /> FAX(650)232-9612 <br /> Analytical www sequoialabs corn <br /> 1er-Ryan/Ge0strategies(1) Project Tosco(l) <br /> 47 Sierra Court, Suite J Project Number Tosco(Former BP)SS#11192, Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 11/21/01 13 29 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1 l 10068-EPA 5030B P/T] _ <br /> LCS(1110068-BS2) Prepared&Analyzed 11/19/01 <br /> M�ethyl tert-butyl ether 553 10 ug/l 500 111 70-130 <br /> Surrogate 1 2-Drchloroethane-d4 260 250 104 70-130 <br /> Surrogate Toluene-d8 288 2.50 115 70-130 <br /> LCS(1110068-BS3) Prepared&Analyzed 11/20/01 <br /> Methyl ten-butyl ether 500 10 ug/1 Soo 100 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 235 250 940 70-130 <br /> Surrogate Toluene-d8 282 250 113 70-130 <br /> Ma#rix S ike(1110068-MS1) Source 111063-08 Prepared&Analyzed 11/16/01 <br /> Methyl ten-butyl ether 529 10 UO 500 ND 106 60-140 <br /> Surrogate 1,2-Dichloroethane-& 449 -500 898 70-130 <br /> Surrogate Toluene-d8 540 500 108 70-130 <br /> Ix Spike Dup(I 110068-MSDI) Source L111063-08 Prepared&Analyzed 11/16/01 <br /> Tethyl tert-butyl ether 499 10 ug/l Soo ND 998 60-140 603 25 <br /> Surrogate 12-Dichloroethane-d4 439 500 878 70-130 <br /> Surrogate Toluene-d8 550 Soo 110 70-130 <br /> Batch 1110075-EPA 5030B JP/T1 <br /> Blank(I I10075-BLKI) Prepared&Analyzed 11/19/01 <br /> Ethanol ND 500 ugh <br /> I '_-Dibromoethane ND 10 " <br /> ')Oiloroethane ND 10 " <br /> r1 opropvl ether ND 10 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tent-butyl ether ND 10 " <br /> Teri-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 12-Dichloroethane-d4 493 500 986 70-130 <br /> Surrogate Toluene-d8 523 500 105 70-130 <br /> to Analytical -San Carlos 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 17 of 19 <br />