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885 Jarvis DriveSequoia Morgan Hill,CA 95037 <br /> _ (408)7 76-9600 <br /> � Analytical FAX(408)782-6308 <br /> . - www scquolalabs corn - <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MND0090 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/19/04 17 58 <br /> Purgeable Hydrocarbons (C6-C10) & 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 4D13002-EPA 5030B PIT <br /> Blank(4D13002-BLKI) Prepared&Analyzed 04/13/04 <br /> Methyl tent-butyl ether ND 050 uglt <br /> Gasoline Range Organics(C4 C 12) ND 50 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 11-Dichloroethane-d4 488 500 976 78-119 <br /> Laboratory Control Sample(41D13002-BS1) Prepared&Analyzed 04/13/04 <br /> Methyl tent butyl ether 997 050 ug/t 100 987 63-137 <br /> Benzene 105 050 100 105 69-124 <br /> Toluene 980 050 100 980 78-129 <br /> Ethylbenzene 104 050 „ 100 104 84-132 <br /> Xylenes(total) 282 050 300 940 83-137 <br /> Surrogate 1 1-Dichloroethane-d4 467 500 934 78-129 <br /> Laboratory Control Sample(4D13002-BS2) Prepared&Analyzed 04/13/04 <br /> Gasoline Range Organics(C4-C12) 359 50 ug/l 440 816 70-124 <br /> Surrogate 1 1-Dichloroethane-d4 469 500 938 78-119 <br /> Laboratory Control Sample Dnp(410013002-BSDI) Prepared&Analyzed 04/13/04 <br /> Methyl tent butyl ether 102 050 uglk 100 102 63-137 329 20 <br /> Benzene 106 050 too 106 69-124 0 948 20 <br /> Toluene 100 050 100 100 78-129 202 20 <br /> Ethylbenzene 102 050 too 102 84-132 1 94 20 <br /> Xylenes(total) 286 050 300 953 83-137 141 20 <br /> Surrogate 12 Dichloroethane-d4 458 " 500 916 78-119 <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 15 <br />