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8Jarvis Dave <br /> Sequoia Morgan HI Hill CA 95037 <br /> (408)776 9600 <br /> � Analytical seq(408)782 6308 <br /> www equoialahs com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 42133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Protect 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 P/T/EPA 8260B <br /> Matrix Spike(6C09012-MSI) Source MPCO250-14RE1 Prepared 03/09/06 Analyzed 03/10/06 <br /> tert-Amyl methyl ether 1620 50 ug/l 1630 ND 99 80-115 <br /> Benzene 510 50 504 ND 101 65-115 <br /> teri-Butyl alcohol 37300 2000 " 16900 24000 79 75-120 <br /> Di-isopropyl ether 1580 50 1620 ND 98 75-125 <br /> 1 2-Dibromoethane(EDB) 1520 50 1660 ND 92 85-120 <br /> 1 2 Dichloroethane 1370 50 1550 ND 88 85-130 <br /> Ethanal 13900 30000 16500 ND 84 70-135 <br /> Ethyl teri-butyl ether 1620 50 1640 ND 99 75-130 <br /> Ethylbenzene 707 50 728 ND 97 75-135 <br /> Methyl tert-butyl ether 1810 50 784 1100 91 65-125 <br /> Toluene 3410 50 3800 ND 90 85-120 <br /> Ses(total) 4180 50 " 4080 ND 102 85-125 <br /> tine Range Organics(C4-C12) 45600 5000 44000 1300 101 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 219 250 88 60-135 <br /> Sui rogate Toluene-dS 261 250 104 70-120 <br /> Surrogate Drbromofluoromelhane 251 2 50 100 65-130 <br /> Surrogate 4-Bromofluorobenzene 239 250 96 70-120 <br /> Matrix Spike Dup(6C09012-MSD1) Source MPCO250-14RE1 Prepared 03/09/06 Analyzed 03/10/06 <br /> tert-Amyl methyl ether 1650 50 ugll 1630 ND 101 80-115 2 15 <br /> Benzene 520 50 504 ND 103 65-115 2 20 <br /> ten Butyl alcohol 39900 2000 16900 24000 94 75-120 7 25 <br /> Di-Isopropyl ether 1610 50 1620 ND 99 75-125 2 15 <br /> 1 2-Dibromoethane(EDB) 1550 50 1660 ND 93 85-120 2 15 <br /> 12-Dichloroethane 1400 50 1550 ND 90 85-130 2 20 <br /> Ethanol 17300 30000 16500 ND 105 70-135 22 35 <br /> Ethyl ter(-butyl ether 1660 50 1640 ND 101 75-130 2 25 <br /> Ethylbenzene 712 50 728 ND 98 75-135 07 15 <br /> Methyl tert-butyl ether 1840 50 784 1100 94 65-125 2 20 <br /> Toluene 3410 50 3800 ND 90 85-120 0 20 <br /> Xylenes(total) 4210 50 4080 ND 103 85-125 07 20 <br /> Gasoline Range Organics(C4-C 12) 44800 5000 44000 1300 99 60-140 2 25 <br /> Surrogate 1 2-Dichloroethane-d4 228 250 91 60-135 <br /> Swrogare Toluene-d8 268 2 50 107 70-120 <br /> Surrogate Dihromofluoromethane 257 250 103 65-130 <br /> Sun rogate 4-Bromofluorobenzene 252 250 101 70-120 <br /> �quola 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 II of 20 <br />