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885 T7 <br /> Sequoia Morgaralld1 CA A 95035037 <br /> a- ) (408)776-9600 <br /> W Analytical FAX(408)782 6308 <br /> fawww sequmale6a coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO 42133,Rancho Cordova,CA N4NI0853 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Racho Cordova,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 10/06/04 15 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit 13mis Level Result %REC Limits RPD Limit Notes <br /> Batch 4JO5002- EPA 5030B PIT <br /> Laboratory Control Sample(4305002-BSI) Prepared&Analyzed 10/05/04 <br /> Toluene 961 050 ug/l 100 96 78-129 <br /> Xylenes(total) 30 1 050 300 100 83-137 <br /> Surrogate 12-Dichloroeihane-d4 500 500 100 78-129 <br /> Laboratory Control Sample(4J05002-BS2) Prepared&Analyzed 10/05/04 <br /> Benzene 540 050 ug/l 640 84 69-124 <br /> Ethylbenzene 761 050 752 101 84-132 <br /> Methyl tent-butyl ether 893 050 992 90 63-137 <br /> Toluene 328 050 31 9 103 78-129 <br /> Xylenes(total) 381 050 366 104 83-137 <br /> Gasoline Range Organics(C4-C 12) 476 50 440 108 70-124 <br /> i <br /> Surrogate 12-Dtchloroethane-d4 505 500 101 78-129 <br /> . <br /> Laboratory Control Sample Dup(4J05002-BSDI) Prepared&Analyzed 10/05/04 <br /> tert-Amyl methyl ether 102 050 ug/l 100 102 82-140 1 20 <br /> Benzene 107 050 100 107 69-124 0 9 20 <br /> tert-Butyl alcohol 52 4 20 50 0 105 56-131 5 20 <br /> Di-isopropyl ether 10 4 050 10 0 104 76-130 1 20 <br /> 1,2-Dibromoethane(EDB) 10 6 0 50 100 106 77-132 3 20 <br /> 1,2-Dtchloroethane 108 0 so 100 108 77-136 2 20 <br /> Ethanol 212 100 200 106 31-143 7 20 <br /> Ethyl tert-butyl ether 106 050 100 106 81 121 4 20 <br /> Ethylbenzene 102 0 50 " 100 102 84-132 1 20 <br /> Methyl tert-butyl ether 112 0 50 too 112 63-137 8 20 <br /> Toluene 962 050 too 96 78-129 0 1 20 <br /> Xylenes(total) 299 050 300 100 83-137 07 20 <br /> Surrogate 12-Dichloroethane-d4 511 500 102 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 13 of 15 <br />