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rL1Sequoia Hill ns Drive <br /> ''��/'"� Morgan Hill CA 45037 <br /> (408)776-9600 <br /> 4/ Analytical FAX(408)782-6308 <br /> wvnv sequoialsbs com <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 11112!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 Limn Notes <br /> Batch 4KO3010-EPA 5030B PIT/EPA 8260E <br /> Laboratory Control Sample(4K03010-BS2) Prepared&Analyzed 11/03/04 <br /> Benzene 538 050 ug/I 640 84 69 124 <br /> Ethylbenzene 709 050 752 94 84 132 <br /> Methyl tent-butyl ether 878 050 992 89 63-137 <br /> Toluene 300 050 31 9 94 78 129 <br /> Xylenes(total) 386 050 n 366 105 83-137 <br /> Gasoline Range Organics(C4-C 12) 378 50 440 86 70 124 <br /> Surrogate 1 1-Dichloroethane-d4 480 500 96 78-129 <br /> Laboratory Control Sample Du (4K03410-ESDI) Prepared alyzed 11/03/04 <br /> tett-Amyl methyl ether 101 050 USA 100 101 82 140 12 20 <br /> Benzene 8 84 050 100 88 69-124 6 20 <br /> tent-Butyl alcohol 51 1 20 50 0 102 56-131 02 20 <br /> Dr-isopropyl ether 10 7 050 100 107 76-130 8 20 <br /> 1,2-Dibromoethsno(EDB) 10 3 050 100 103 77-132 9 20 <br /> 1,2-Dichloroethane 941 050 100 94 77-136 6 20 <br /> Ethanol 268 100 200 134 31-143 30 20 RB <br /> Ethyl ten-butyl ether 102 050 100 102 81-121 4 20 <br /> Ethylbeaune 1 l 3 050 " 10 0 113 84132 22 20 RB <br /> Methyl tent-butyl ether $80 050 100 88 63-137 7 20 <br /> Toluene 140 050 100 140 78-129 41 20 HL <br /> Xylenes(total) 386 0 50 " 300 129 83-137 23 20 RB <br /> Surrogate 1 2-Drchloraethane-d4 430 500 86 78-129 <br /> Matrix Spike 4K03010-MSI) Source MN.J0632-07 Prepared&Analyzed 11/03/04 <br /> Benzene 536 50 ugn 640 ND 84 69-124 <br /> Etbylbenzene 704 50 752 ND 94 84-132 <br /> Methyl ten-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) 40200 5000 44000 4600 81 70-124 <br /> Surrogate 1,1-Dichloroethane-d4 4 78 " 500 96 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply pply to the samples analyzed in accordance with the chars 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 16 of 22 <br />