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885 Jarvis Drive <br /> 4DS4DMorgan Hill,CA 95037 <br /> equoia (408)776 9600 <br /> 1W Analytical www <br /> seq(408)782-6308 <br /> om <br /> www sequoialabs com <br /> 0 <br /> Secor-Rancho Cordova(ARCO) Project ARCO 42133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Dumber Arca#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03!31106 14 03 <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 6CO9012-EPA 5030B PIT 1 EPA 8260B <br /> Laboratory Control Sample(6009012-BS2) Prepared&Analyzed 03!09!06 <br /> lent Amyl methyl ether 164 050 ugA 163 lot 80-115 <br /> Benzene 4 89 050 504 97 65-115 <br /> tert Butyl alcohol 175 20 169 104 75-150 <br /> - Di-isopropyl ether -- - -_ - _ 15 3— 050 _ ----162 - --_94 - 75-125 <br /> 1,2-Dibromoethane(EDS) 160 050 166 96 Y 85-12D' <br />�1-,2 Dichloroethane 14 3 0 50 15 5-- --92_ 85-130 <br /> --Ethanol-- - — -- - _ __ _ 141 _ 300 - 165 - 116 70-135 - <br /> TEtkiyl Teri hu I ether 160 050—,, 164 98 75-130 <br /> Ethylbenzene 737 050 728 101 75-135 <br /> Methyl tt rt butyl ether 740 050 784 94 65-125 <br /> toluene 342 050 380 90 85-120 <br /> Xylenes(total) 43 4 050 408 106 85-125 <br /> Gasoline Range Organics(C4-C 12) 453 50 440 103 60-140 <br /> Stttrogare 1 1-Dichloroethane-d4 243 250 97 60-135 <br /> Stn i ogole Toluene-d8 263 250 105 70-120 <br /> Surrogate Dibromofluaromethane 260 250 104 65-130 <br /> Surrogate 4-Bromofluoroben:7ene 253 250 101 70-120 <br /> Laboratory Control Sample Dup(6C09012-BSD1) Prepared&Analyzed 03/09/06 <br /> Chlorobenzene 21 0 050 ugll 200 105 60-120 1 10 <br /> 1 2-Dichlorobenzene 203 050 200 102 80-125 1 10 <br /> l 3 Dichlorobenzene 203 050 200 102 75-120 2 10 <br /> 1 4 Dichlorobenzene 204 050 200 102 75-120 2 15 <br /> Stu rogaie 1 2-Dichloroethane-d4 2 32 2 5D 93 70-135 <br /> Surrogate 4-Bromofluoroben_ene 255 <br /> �� 2.50 102 70-120 <br /> Suri ogale Dtbromofluoromethane <br /> 260 250 104 b5-130 <br /> Surrogate Toluene-d8 263 250 <br /> 105 70-120 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed to 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 10 of 20 <br />