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885 Jarvis Drive <br /> 4 (408)776 9600DFAX Sequoia Morgan Full CA 95037 <br /> (408)782-6308 <br /> ,%WAnalytical www sequotalabs com <br /> db <br /> Secor-Rancho Cordova(ARCO) Project ARCO#12133, 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 6CO9034- EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(6C09034-BSD2) Prepared 03/09/06 Analyzed 03/10/06 <br /> tert Amyl methyl ether 159 050 ugA 163 98 80-115 06 15 <br /> Benzene 490 0 50 504 97 65-115 4 20 <br /> tert Butyl alcohol 161 20 169 95 75-150 4 25 <br /> Di isopropyl ether 15 2 050 16 2 94 75-125 2 15 <br /> 1 2-Dibromo than--- (EDB) - 15 3- -—0 50 --166 f_ 4 92 --'85-120-LL=-3- =-15- - -- - <br />_,.1,2 Dichloroethane 141 050 155 91 85-130 2 20 <br /> Ethanol 164 300 165 99-70:135-2 5 <br />—Ethyl tent butyl ether - - f 15 B 050- 16 4 96 75=130 - 2 25 <br /> Ethylbenzene 700 050 728 96 75-135 2 15 <br /> Methyl Cert butyl ether 727 0 50 784 93 65-125 0 4 20 <br /> l oluene 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 11-Dichloroethane-d4 236 - 250 94 60-135, r <br /> Surrogate Toluene-d8 258 2 50 103 70-110 <br /> .Sui rogate Dibromofluoromethane 2 54 250 102 65-130 <br /> Surrogate 4-BromofTuorobencene L 247 250 99 70-120 <br /> Batch 6C13001 - EPA 5030B PIT I EPA 8260B <br /> Blank(603001-BLKI) Prepared&Analyzed 03/13/06 <br /> Teri-Amyl methyl ether ND 050 ugA <br /> BLnzene ND 0 50 " <br /> tort Butyl alcohol ND 20 " <br /> Chlorobenzene ND 0 50 " <br /> Di isapropyi ether ND 050 " <br /> 1 2 Dibromoethane(EDB) ND 050 " <br /> 12-Dichlorobenzene ND 050 " <br /> 1 3-Dichlorobenzene ND 050 " <br /> 1,4 Dichlorobenzene ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 300 " <br /> Ethyl Cert butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl teri 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 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 14 of 20 <br />