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885 Jarvis Drive <br /> CA 95037 <br /> Sequoia Morgan(409)776 9600 <br /> 4DFA1%0 Analytical <br /> seq Analytical 8)782 6308 <br /> www equoialahs cum <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03/31/06 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/EPA 8260B <br /> Laboratory Control Sample(6C09012-BS2) Prepared&Analyzed 03/09/06 <br /> tert-Amyl methyl ether 164 050 ugA 163 101 80-115 <br /> Benzene 4 89 050 504 97 65-115 <br /> tert Butyl alcohol 175 20 169 104 75-150 <br /> _ <br /> DI isopropyl ether _ _ _ 153 _ 0 50 _ 16 2 - __ - 94 75-125 <br /> 1,2 Dibromoethane(EDB) 160 050 16 6 96 s 85=120 <br />=1-2-Dichloroethane —143-050 15 5 92 85-130 <br /> Ethanol 191 300 165 116 70-135 <br />=Ethyl terl-butyl ether 16 Q--0 50 16 4 98 75-130 - <br /> Ethylbenzene 737 050 728 101 75-135 <br /> Methyl tert butyl ether 740 050 7 84 94 65-125 <br /> 1 oluene 34 2 0 50 380 90 85-120 <br /> Xylenes(total) 434 050 408 106 85-125 <br /> Gasoline Range Organics(C4-C 12) 453 50 440 103 60-140 <br /> Stu rugate 12-Dichloroethane-d4 243 250 97 60-135 <br /> Surrogate Toluene-d8 2 63 250 105 70-120 <br /> Surrogate Dibromo luoromethane 260 250 104 65-130 <br /> Surrogate 4-Bromofluorobenzene 253 250 101 70-120 <br /> Laboratory Control Sample Dup(6C09012-BSDI) Prepared&Analyzed 03/09/06 <br /> Chlorobenzene 210 050 ug/l 200 105 80-120 1 to <br /> 1,2 Dichlorobenzene 203 050 200 102 80-125 1 10 <br /> 1 3-Di0lorobenzene 203 050 200 102 75-120 2 10 <br /> 1 4 Dichlorobenzene 204 050 200 102 75-120 2 15 <br /> Surrogate 12-Dichloroethane-d4 232 250 43 60-135 <br /> Surrogate 4-Bromofluorobenzene <br /> 2.55 2 50 102 70-120 <br /> Surrogate Dibromo luoromelhane 260 250 104 65-130 <br /> Surrogate Toluene-d8 2 63 2 50 105 70-120 <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 in its entirety <br /> Page 10 of 20 <br />