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r� Sequoia Hi 8Jarvis Drive <br /> Morgan Hill CA 95037 <br /> (408)776 9600 <br /> Analytical FAX(408)78Z-6308 <br /> www sequoialabs com <br /> Secor- Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#213 3, 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 /> An Result Lima Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6CO9012-EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(6C090I2-MSI) Source MPCO250-14RE1 Prepared 03/09/06 Analyzed 03/10/06 <br /> Cert-Amyl methyl ether 1620 50 ugll 1630 ND 99 80-115 <br /> Benzene 510 50 504 ND 101 65-115 <br /> tert 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 /> 12-Dichloroethane 1370 50 1550 ND 88 85-130 <br /> Ethanol 13900 30000 16500 ND 84 70-135 <br /> Ethyl ten-butyl ether 1620 50 1640 ND 99 75-130 <br /> Ethylbenzene 707 50 728 ND 97 75-135 <br /> Methyl cert-butyl ether 1810 50 784 1 100 91 65-125 <br /> Toluene 3410 50 3800 ND 90 85-120 <br /> nes(total) 4180 50 „ 4080 ND 102 85-125 <br /> line Range Organics(C4-C 12) 45600 5000 44000 1300 101 60-140 <br /> Surrogate 12-Dichloroethane-d4 219 2 50 88 60-135 <br /> Surrogate Toluene-d8 2 61 250 104 70-120 <br /> Surrogate Dibromofluoromelhane 251 2 50 100 65-130 <br /> Surrogate 4-Bromofluoroben_ene 239 250 96 70-120 <br /> Matrix Spike Dup(6C09012-MSD1) Source MPCO250-14RE1 Prepared 03/09/06 Analyzed 03/10/06 <br /> Cert-Amyl methyl ether 1650 50 ug,9 1630 ND 101 80-115 2 15 <br /> Benzene 520 50 504 ND 103 65-115 2 20 <br /> tert 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 Di bromoethane(EDB) 1550 50 1660 ND 93 85-120 2 l5 <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 teri-butyl ether 1660 50 1640 ND 101 75-130 2 25 <br /> Ethylbenzene 712 50 728 ND 98 75-135 07 15 <br /> Methyl teri-butyl ether 1840 50 784 1100 94 65-125 2 20 <br /> 1 olucnc, 3410 50 3800 ND 90 85-120 0 20 <br /> X)lenes(total) 4210 50 4080 ND 103 85-125 0 7 20 <br /> Gasoline Range Organics(C4-C12) 44800 5000 44000 1300 99 60-140 2 25 <br /> Surrogate 1 2-Dichloroethane-d4 228 250 91 60-135 <br /> Surrogate Toluene-d8 1 68 250 107 70-120 <br /> Surrogate Dibromofluoromethane 257 250 103 65-130 <br /> ,Surrogate 4-Bromof7uoroben-ene 252 250 101 70-120 <br /> quoia 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 weighl basis <br /> This analytical report must be reproduced to its entirely <br /> Page 11 of 20 <br />