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885 larvis 5037 <br /> A <br /> Sequoia Morgue(408)776 9600 <br /> 308 <br /> Analytical www <br /> seq o)782.corn <br /> www sequoialats corn <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reporter! <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 Limll Notes <br /> Batch 4G23004-EPA 5030B PIT <br /> Matrix Spike(4G23004-MSI) Source MNG0375-01 Prepared&Analyzed 07/23/04 <br /> Benzene 198 2 5 ug/l 320 170 88 78-124 <br /> Ethylbenzene 83 2 2 5 348 42 118 84 117 LM <br /> Methyl tert butyl ether 595 2 5 496 34 51 63-137 LN <br /> Toluene 160 2 5 148 3 3 106 78-129 <br /> Xylenes(total) 216 2 5 168 20 117 83 125 <br /> Gasoline Range Organics(C4-C 12) 2920 250 2200 780 97 70-124 LM <br /> Surrogate 1 2-Dichloroerhane-d4 231 2 50 92 78-129 <br /> Matrix Spike Dup(4G23004-MSDI) Source MNG0375-01 Prepared&Analyzed 07/23/04 <br /> Benzene 187 2 5 ug/1 32 0 170 53 78 124 6 12 LN <br /> Ethylbenzene 91 8 2 5 348 42 114 84 117 2 10 <br /> Methyl tert-butyl ether 65 6 25 496 34 64 63-137 10 13 • <br /> Toluene 160 25 148 3 3 W6 78-129 0 10 <br /> Xylenes(total) 214 2 5 168 20 115 83 12.5 0 9 11 <br /> Gasoline Range Organics(C4-C12) 2840 250 2200 780 94 70 124 3 20 LM <br /> Surrogate 12-Dichloroethane-d4 104 " 150 82 78-129 <br /> Batch 4G28006-EPA 5030B PIT <br /> Blank(4G28006-BLKI) Prepared&Analyzed 07/28/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tent Butyl alcohol ND 20 " <br /> DI-Isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanal ND 100 " <br /> Ethyl text-butyl ether ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 12 Dichloroethane d4 499 500 100 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 m its entirety <br /> Page 21 of 24 <br />