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Dr <br /> Sequo. ill A 95 37 <br /> ia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAX o6308Analytical wwwscguouilabs om <br /> Secor-Rancho Cordova(ARCO) Project ARCO#}4932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %nREC RPD <br /> Analyte Result Limit Units level Result °/uREC Limits RPD limit Notes <br /> Batch 4619006-EPA 5030B PIT <br /> Laboratory Control Sample Dup(4G19006-BSD2) Prepared&Analyzed 07/19/04 <br /> Benzene 5 13 0 50 ugll 640 80 69-124 9 20 <br /> Ethylbenzene 765 0 50 696 110 84-132 5 20 <br /> Methyl tert butyl ether 8 71 0 50 992 88 63-137 3 20 <br /> Toluene 305 050 297 103 78-129 4 20 <br /> Xylenes(total) 380 050 33 7 113 83-137 6 20 <br /> Gasoline Range Organics(C4-C12) 443 50 440 101 70-124 7 20 <br /> Surrogate 1 2-D+chloroethane-d4 494 500 99 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 9 of 11 <br />