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Sequoia <br /> 885 Jarvis Dr <br /> Se uoia MoganHill,(408 7795037 <br /> `i (408)776-9600 <br /> Analytic al FAX(408)782-6308 <br /> www sequoialabs can <br /> Stratus Environmental lne Project ARCO#2168 MLK0507 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/20/02 07 53 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K27002-EPA 5035 <br /> Laboratory Control Sample(2K27002-BS1) Prepared&Analyzed 11/27/02 <br /> Methyl tent-butyl ether 101 050 u9/1 100 101 63-137 <br /> Benzene 101 050 100 101 78-124 <br /> Toluene 102 050 100 102 78-129 <br /> Surrogate 12-Dichloroethane-d4 468 5 00 93 6 78-129 <br /> Laboratory Control Sample(23027002-BS2) Prepared&Analyzed 11/27/02 <br /> Methyl tert-butyl ether 852 050 ug/l 840 101 63-137 <br /> Benzene 453 050 528 85 8 78-124 <br /> Toluene 34 6 050 318 109 78-129 <br /> Gasoline Range Organics(C6-C10) 420 50 440 95 5 70-113 <br /> rrogate 1 2-Dichloroethane-d4 4-56 5610 912 78-129 <br /> Laboratory Control Sample Du (2K27002-BSD1) Prepared&Analyzed 11/27/02 <br /> Methyl tert-butyl ether 1 1 2 050 ug/1 100 112 63-137 103 13 <br /> Benzene 106 050 100 106 78-124 4 83 12 <br /> Toluene 103 050 100 103 78-129 0 976 10 <br /> Surrogate 12-Dichloroethane-d4 4 74 " 500 948 78-129 <br /> Laboratory Control Sample Dup(2K27002-BSD2) Prepared 11/27/02 Analyzed 11/28/02 A-01 <br /> Methyl tert-butyl ether 834 050 ug/l 840 99 3 63-137 2 14 13 <br /> Benzene 4 69 050 528 88 8 78-124 347 12 <br /> Toluene 36 3 0 50 31 8 114 78-129 480 10 <br /> Gasoline Range Organics(C6-C 10) 458 50 440 104 70-113 866 9 <br /> Surrogate 12-Dichloroethane-d4 497 .500 99 4 78-119 <br /> equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 11 of 12 <br />