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885 Jarvis Dr <br /> Sequoia MaganHi1,CA95037 <br /> Analytical FAX(408408)776- 9600 <br /> 782-6308 <br /> www sequotalabs can <br /> Stratus Environmental Inc Project ARCO#2186,Stockton,CA MLL0253 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/20/02 09 05 <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 2L17010-EPA 5035 <br /> Laboratory Control Sample(2L17010-BS1) Prepared 12/17/02 Analyzed 12/18/02 <br /> Methyl tert-butyl ether 106 050 ug/l 100 106 63-137 <br /> Benzene 112 050 100 112 78-124 <br /> Toluene 946 050 100 946 78-129 <br /> Surrogate 12-Dichloroethane-d4 548 500 110 78-129 <br /> Laboratory Control Sample(2L17010-BS2) Prepared 12/17/02 Analyzed 12/18/02 <br /> Methyl tert-butyl ether 888 050 ug/1 840 106 63-137 <br /> Benzene 544 0 50 528 103 78-124 <br /> Toluene 292 050 31 8 91 8 78-129 <br /> Gasoline Range Organics(C6-C 10) 358 50 440 81 4 70-113 <br /> er,qgate 1 2-Dichloroethane-d4 528 500 106 78-129 <br /> Laboratory Control Sample Dup(2L1701(1-BSD1) Prepared 12/17/02 Analyzed 12/18102___ <br /> Methyl tert-butyl ether 106 0 50 ug/1 10 0 106 63-137 000 13 <br /> Benzene 110 050 100 110 78-124 180 12 <br /> Toluene 925 050 100 92 5 78-129 224 10 <br /> Surrogate 12-Dichloroethane-d4 5-35 500 107 78-129 <br /> i <br /> Laboratory Control Sample Dup(2L17010-BSD2) Prepared 12/17/02 Analyzed 12/18/02 <br /> Methyl tert-butyl ether 882 050 u8/1 840 105 63-137 0 678 13 <br /> Benzene 549 050 528 104 78-124 0 915 12 <br /> Toluene 304 050 31 8 95 6 78-129 403 10 <br /> Gasoline Range Organics(C6-C10) 379 50 440 861 70-113 5 70 9 <br /> Surrogate 12-Dichloroethane-d4 538 500 108 78-129 <br /> _Sequoia 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 /> Page 10 of 11 <br />