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11) (408)8Janis 107 <br /> Sequoia MorgsnHiHill CA 955037 <br /> 776 9600 <br /> Analytical FAX(408)7826308 <br /> www sequoialabs coin <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJ0793 <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 /> 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 4KO3010 -EPA 5030B PIT/EPA 82608 <br /> Laboratory Control Sample(4K03010-BS2) Prepared&Analyzed 11/03/04 <br /> Benzene 538 050 ug,9 640 84 69-124 <br /> Ethylbenzene 709 050 752 94 84-132 <br /> Methyl tert-butyl ether 878 050 992 89 63-137 <br /> Toluene 300 050 319 94 78-129 <br /> Xylenes(total) 38 6 0 50 366 105 83-137 <br /> Gasoline flange Organics(C4-C12) 378 50 440 86 70-124 � <br /> Surrogate 1 2-Dichloroethane-d4 4 80 500 96 78-129 <br /> Laboratory Control Sample Dup(4K03010-ESDI) Prepared&Analyzed 11/03/04 <br /> tert-Amyl methyl ether 101 050 ug/l 10 0 101 82-140 12 20 <br /> Benzene 8 84 0 50 100 88 69-124 6 20 <br /> tert-Butyl alcohol 51 1 20 500 102 56-131 0 2 20 <br /> Di-isopropyl ether 107 0 50 10 0 107 76-130 8 20 <br /> 1,2-Dihromoethane(EDB) 103 050 10 0 103 77-132 9 20 <br /> 1,2-Dichloroethane 9 41 0 50 100 94 77-136 6 20 <br /> Ethanol 268 100 200 134 31-143 30 20 RB <br /> Ethyl tert-butyl ether 10 2 050 100 102 81-121 4 20 <br /> Ethylbenzene 113 050 10 0 113 84-132 22 20 RB <br /> Methyl tert-butyl ether 880 0 50 10 0 88 63-137 7 20 <br /> Toluene 140 050 100 140 78-129 41 20 HL <br /> Xylenes(total) 386 050 300 129 83-137 23 20 RB <br /> Surrogate 12-Dichloroethane-d4 430 5 00 86 78-129 <br /> Matrix Spike(4K03010-MSI) Source MNJ0632-07 Prepared&Analyzed 11/03/04 <br /> Benzene 536 50 ug/l 640 ND 84 69-124 <br /> Ethylbenzene 704 50 752 ND 94 84-132 <br /> Methyl tert-butyl ether 4600 50 992 3700 91 63-137 <br /> Toluene 2890 50 3190 ND 91 78-129 <br /> Xylenes(total) 3880 50 3660 ND 106 83-137 <br /> Gasoline Range Organics(C4-C 12) 402200 5000 44000 4600 81 70-124 <br /> Surrogate 12-Dichloroethane d4 478 5 00 96 78-129 <br /> I <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 he reproduced in its entirety <br /> Page 16 of 22 <br />