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a- ) <br /> n Hi Jarvis 5037Sequoia MorganRilE,CA95037(408)776-9600 <br /> � Analytical FAX(409)792-6308 <br /> www.sequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOC8D-0001 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Clinton Harms 08/01/05 11:10 <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 5G25011 -EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(SG25011-BS2) Prepared&Analyzed:07/25/05 <br /> Benzene 5.29 0,50 ug/l 6.08 87 65-115 <br /> Ethylbenzene 6.17 0.50 7.84 79 75-135 <br /> i , <br /> Methyl tent-butyl ether 9.43 0.50 " 9.60 98 65-125 j <br /> Toluene 32.2 0.50 32.9 98 85-120 <br /> Xylenes(total) 30,0 0.50 38.5 78 85-125 Tim <br /> Gasoline Range Organics(C4-C12) 390 50 440 89 70-124 <br /> Surrogate: 1,2-Dichloroethane-d4 1.44 1.50 98 60-135 <br /> Laboratory Control Sample Dup(5G25011-BSDI) Prepared:07/25/05 Analyzed:07/26/05 <br /> tert-Amyl rnethyl ether 11,1 0.50 ugll 10.0 111 80-115 5 15 <br /> Benzene 11.1 0.50 10.0 111 65-115 14 20 <br /> tert-Butyl alcohol 51.0 20 50.0 102 75-150 9 25 <br /> �i-isopropyl ether 10.5 0.50 ii 10.0 105 75-125 9 15 <br /> 1,2-Dibromoethane(EDB) 11.1 0.50 10.0 111 _ 85-120 4 15 <br /> 1,2-Dichloroethane 11.3 0.50 10.0 113 85-130 3 20 <br /> Ethanol 159 100 200 80 70-135 0.6 35 <br /> Ethyl tent-butyl ether 10.8 0.50 10.0 108 75-130 8 25 <br /> Ethylbenzene 9.30 0.50 10.0 93 75-135 15 15 <br /> Methyl tett-butyl ether 11.0 0.50 10.0 110 65-125 4 20 <br /> Toluene 11.4 0.50 10.0 114 85-120 15 20 <br /> Xylenes(total) 27.5 0.50 30.0 92 85-125 13 20 <br /> Surrogate:1,2-Dichloroethane-d4 2.50 2.50 100 60-135 <br /> Matrix Spike(5G25011-MSI) Source:MOG0595-06 Prepared:07/25/05 Analyzed:07/26/05 <br /> Benzene 316 25 ugll 304 ND 104 65-115 <br /> Ethylbenzene 380 25 392 7.5 95 75-135 <br /> Methyl tert-butyl ether 3670 25 480 3300 77 65-125 <br /> Toluene 2000 25 1640 ND 122 85-120 LM <br /> Xylenes(total) 1870 25 1920 ND 97 85-125 <br /> Gasoline Range Organics(C4-C12) 26600 2500 22000 1800 113 70-124 <br /> Surrogate:l,2-Dichloroethane-d4 1.57 1.50 103 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analysed 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 18 of 27 <br />