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885 JarVLs Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (aos)776-9600 <br /> FAX(408)782-6308 <br /> 1W Analytical WWW sefl"Walabscom <br /> 0 <br /> URS Corporation [Arco 11 Project ARCO#5469, Stockton,CA MPB0836 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0011 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 02/28/06 19 13 <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 RFD Limit Notes <br /> Batch 611324009-EPA 5035 1 EPA 8260B <br /> Matrix Spike(6B24009-MSI) Source MPB0836-01 Prepared&Analyzed 02/24/06 <br /> cert-Amyl methyl ether 00152 00050 mg/kg 00163 000016 92 80-130 <br /> Benzene 000458 00050 000504 ND 91 65-125 <br /> tert-Butyl alcohol 0 147 0 020 0 169 00020 86 80-135 <br /> Di-isopropyl ether 00146 00050 00162 ND 90 85-115 <br /> 1,2-Dibromoethane(EDB) 00158 00050 00166 ND 95 85-130 <br /> 1 2-Dtchloroethane 00142 00050 00155 ND 92 63-124 <br /> Ethanol 0134 010 0165 ND 81 35-150 <br /> Ethyl tert-butyl ether 00149 00050 00164 ND 91 80-125 <br /> Ethylbenzene 000680 00050 000728 ND 93 80-135 <br /> Methyl tert-butyl ether 000668 00050 000784 ND 85 75-115 <br /> Toluene 00337 00050 00380 000037 88 85-125 <br /> es(total) 00399 00050 00408 000052 97 80-140 <br /> MLn Ir <br /> me Range Organics(C4-C12) 0 514 010 0 440 ND 117 53-126 PE <br /> Surrogate 12-Dtchloroethane-d4 000424 000500 85 60-125 <br /> Matrix Spike Dup(6B24009-MSD1) Source MPBO836-01 Prepared&Analyzed 02/24/06 <br /> tert-Amyl methyl ether 00155 00050 mg/kg 00163 000016 94 80-130 2 25 <br /> Benzene 000463 00050 000504 ND 92 65-125 1 20 <br /> tert-Butyl alcohol 0 148 0 020 0 169 00020 86 80-135 0 7 20 <br /> Di-Isopropyl ether 00149 00050 00162 ND 92 85-115 2 20 <br /> 1 2-Dibromoethane(EDB) 00158 00050 00166 ND 95 85-130 0 15 <br /> 1,2-Dtchloroethane 00143 00050 00155 ND 92 63-124 0 7 25 <br /> Ethanol 0146 010 0165 ND 88 35-150 9 40 <br /> Ethyl tert-butyl ether 00153 00050 00164 ND 93 80-125 3 25 <br /> Ethylbenzene 000679 00050 000728 ND 93 80-135 0 1 20 <br /> Methyl cert-butyl ether 000681 00050 000784 ND 87 75-115 2 35 <br /> Toluene 00347 00050 00380 000037 90 85-125 3 15 <br /> Xylenes(total) 00403 00050 00408 000052 98 80-140 1 20 <br /> Gasoline Range Organics(C4-Cl2) 0 510 0 10 0 440 ND 116 53-126 0 8 25 PE <br /> Surrogate 12-Dichloroethane-d4 000420 000500 84 60-125 <br /> �uola Analytical-Morgan Hill The results in this report apply to the samples analy_ed 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 11 <br />