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a- ) <br /> 885 Jarvis Drive <br /> ill CA 95037 <br /> Sequoia Morgan(408)775 4600 <br /> Analytical www <br /> scq 8) labs82 c o8 <br /> www seQuoialabs com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2I33,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 42133,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 6CO9034- EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample Dup(6C09034-BSD2) Prepared 03/09/06 Analyzed 03/10/06 <br /> tert-Amyl methyl ether 159 050 ug/l 163 98 80-115 06 15 <br /> Benzene 490 050 504 97 65-115 4 20 <br /> tert-Butyl alcohol 161 20 169 95 75-150 4 25 <br /> Di-isopropyl ether _152 050 162 94 75-125 2 15 <br /> 12-Dibromoethane(EDB) 153 050 16-6 92 85-120 3 15 - <br />.t 2-Dichloroethane 14 1 0 50_ 15 5 41 85-130 2 20 <br /> Ethanol 164 300 165 99 70-135 2 35 <br />—Ethyl teri-butyl ether - 15 8 0 S0 T 16 4 96 75-130` 2 _ 25 <br /> Ethylbenzene 700 050 728 96 75-135 2 15 <br /> Methyl teri butyl ether 727 050 784 93 65-125 04 20 <br /> Toluene 327 050 380 86 85-120 4 20 <br /> Xylenes(total) 41 8 050 408 102 85-125 2 20 <br /> Gasoline Range Organics(C4-C12) 425 50 440 97 60-140 5 25 <br /> Surrogate 12-Dichloroethane-d4 236 250 94 60-135 <br /> Surrogate Toluene-d8 258 250 103 70-120 <br /> Surrogate DibromoJluoromelhane 254 250 102 65-130 <br /> Surrogate 4-BromoJluoroben_ene 247 250 99 70-120 <br /> Batch 6C 13 001 - EPA 5030B P/T/EPA 8260B <br /> Blank(6C13001-BLK1) Prepared&Analyzed 03/13/06 <br /> Cert Amyl methyl eiher ND 050 ugA <br /> Benzene ND 050 " <br /> tent Butyl alcohol ND 20 " <br /> Clilorobenzene ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> l 2 Dibromoethane(EDB) ND 050 " <br /> I 2-❑ichlerobenzene ND 050 " <br /> 13-Dichlorobenzene ND 050 " <br /> 1 4-Dichlorobenzene ND 050 " <br /> 12-Dichloroethane ND 050 " <br /> F-thanol ND 300 " <br /> h thyl tert butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl Cert butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the char"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 14 of 20 <br />