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(D (40885 Jarvis Dove <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical <br /> 8)79600 <br /> FAX <br /> i (408)78282 6308 <br /> WWW sequoialahs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA NINF0734 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/10/04 11 18 <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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4GO2003-EPA 5030E PIT <br /> Blank(4G02003-BLKI) Prepared&Analyzed 07/02/04 <br /> Methyl tert-butyl ether ND 050 ugtl <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate 12-Dichloroethane-d4 538 500 108 78-129 <br /> Laboratory Control Sample(4G02003-BS1) Prepared&Analyzed 07/02/04 <br /> Methyl tert butyl ether 104 050 ug/l 10 0 104 63-137 <br /> Benzene 8 11 050 10 0 81 69-124 <br /> Toluene 8 82 050 10 0 88 78-129 <br /> hylbenzene 933 050 10 0 93 84-132 <br /> ylenes(total) 266 050 30 0 89 83-137 <br /> Surrogate 12-Dichloroelhane-d4 533 500 107 78-129 <br /> Laboratory Control Sample(4G02003-BS2) Prepared&Analyzed 07/02/04 <br /> Methyl tert butyl ether 9 80 0 50 ug/l 992 99 63-137 <br /> Gasoline Range Organics(C4-C12) 397 50 440 90 70-124 <br /> Benzene 5 37 0 50 640 84 69-124 <br /> Toluene 344 050 29 7 116 78-129 <br /> Ethylbenzene 7 97 0 50 696 115 84-132 <br /> Xylenes(total) 387 0 50 33 7 115 83-137 <br /> Surrogate 12-Drchloroethane-d4 530 5 00 106 78-129 <br /> Laboratory Control Sample Dup(4G02003-BSD1) Prepared 07/02/04 Analyzed 07/03/04 <br /> Methyl tert-butyl ether 12 3 050 ug/I too 123 63-137 17 20 <br /> Benzene 921 0 50 too 92 69-124 13 20 <br /> Toluene 102 050 too 102 78-129 15 20 <br /> Ethylbenzene 947 0 50 100 95 84-132 1 20 <br /> Xylenes(total) 290 050 300 97 83-137 9 20 <br /> Surrogate 12-Dichloroelhane-d4 5 91 5 00 118 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 staled results are reported on a wei weight basrs <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 11 <br />