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Sequoia 885 Jarvis Mme <br /> G <br /> Morgan Hill CA 95037 <br /> (408)776 9600 <br /> � -► Analytical FAX(408)782 6308 <br /> www scquoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MN30793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA, 95670 Project Manager Rusty Benkosky 11/12/04 12 23 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> 11.1a Yle Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 4K10006-EPA 5030E PIT/EPA 8260B <br /> Blank(4K10006-BLK1) Prepared&Analyzed 11/10/04 <br /> Methyl tert butyl ether ND 050 ugA <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate 12-Drchloroethane-d4 471 500 94 78-129 <br /> Laboratory Control Sample(4K10006-BSI) Prepared&Analyzed 11/10/04 <br /> Methyl tert-butyl ether 102 050 ug/l 100 102 63-137 <br /> Benzene 959 050 <br /> 100 96 69-124 <br /> Toluene 983 050 100 98 78-129 <br /> Ethylbenzene 104 050 100 104 84-132 <br /> Xylenes(total) 308 050 300 103 83-137 <br /> Surrogate 1 1-Dichloroelhane-d4 500 500 100 78-129 <br /> Laboratory Control Sample(4K10006-BS2) Prepared&Analyzed 11/10/04 <br /> Methyl tent bury]ether 908 050 ug/l 992 92 63-137 <br /> Gasoline Range Organics(C4-C12) 373 50 440 85 70-124 <br /> Benzene 5 15 050 640 80 69 124 <br /> Toluene 31 6 050 319 99 78-129 <br /> Ethylbenzene 802 050 752 107 84-132 <br /> Xylenes(total) 38 8 050 366 106 83 137 <br /> Surrogate l 2-Dichloroethane-d4 499 500 100 78-129 <br /> Laboratog Control Sample Dup(4K10006-ESDI) Prepared&Analyzed 11/10/04 <br /> Methyl tert-butyl ether 982 050 ugA 100 98 63-137 4 20 <br /> Benzene 903 050 too 90 69-124 6 20 <br /> Toluene 923 050 100 92 78-129 6 20 <br /> Ethylbenzene 998 050 100 100 84-132 4 20 <br /> Xylenes(total) 298 050 300 99 83-137 3 20 <br /> Surrogate 12-Drchloroethane d4 516 500 103 78-119 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed en accordance with the chain of <br /> ID custody document Unless otherwise slated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 22 <br />