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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> it Analytical FAX equot lab 6308 <br /> coin wwtiv sequoialabs coin <br /> 7URS Corporation [Arco II Project ARCO 45469, Stockton,CA MPBO836 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-001 i 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 RPD Limit Notes <br /> Batch 6824009- EPA 50351 EPA 8260B <br /> Blank(61324009-13LKI) Prepared&Analyzed 02/24/06 <br /> tert-Amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 " <br /> I <br /> tert-Butyl alcohol ND 0 020 " <br /> Di-isopropyl ether ND 00050 " <br /> l 2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 010 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> es(total) ND 00050 <br /> me Range Organics(C4-C12) ND 010 PE <br /> Surrogate 12-Dichlaroethane-d4 000430 000500 86 60-125 <br /> Laboratory Control Sample(6B24009-BSI) Prepared&Analyzed 02/24/06 <br /> tert-Amyl methyl ether 00160 00050 mg/kg 00163 98 80-130 <br /> Benzene 000463 00050 000504 92 65-125 <br /> tert-Butyl alcohol 0 146 0 020 0 169 86 80-165 <br /> Di-isopropyl ether 00150 00050 00162 93 85-115 <br /> 1,2-Dibromoethane(EDB) 00164 00050 00166 99 85-130 <br /> 1,2-Dichloroethane 00151 00050 00155 97 63-124 <br /> Ethanol 0136 010 0165 82 35-150 <br /> Ethyl tert-butyl ether 00157 00050 00164 96 80-125 <br /> Ethylbenzene 000684 00050 000728 94 80-135 <br /> Methyl tert-butyl ether 000719 00050 000784 92 75-115 <br /> Toluene 00345 00050 00380 91 85-125 <br /> Xylenes(total) 00409 00050 00408 100 80-140 <br /> Gasoline Range Organics(C4-C12) 0 571 010 0 440 130 53-126 PE HL <br /> Surrogate 1 2-Dichloroethane-d4 000438 000500 88 60-125 <br /> uoia 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 wel weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 11 <br />