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Sequoia SSS Jarvis CA95037 <br /> Morgan Hill CA 95037 <br /> (408)776 9600 <br /> �D- Analytical FAX(408)782 6308 <br /> www sequoialabs corn <br /> URS Corporation[ArcoI] Project ARCO#6020,Manteca,CA MPA1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/14/06 09 04 <br /> Volatile Organic Compounds by EPA Method 8260B -QUallty 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 6BO8009-EPA 5030B PIT I EPA 8260B <br /> Laboratory Control Sample(61308009-BSI) Prepared&AnaIyzed 02/08/06 <br /> Xylenes(total) 665 050 ug/1 600 111 85-125 <br /> Surrogate Dibromofluoromethane 554 500 111 65-130 <br /> Surrogate 12 Diehloroethane-d4 596 500 119 60-135 <br /> Surrogate Toluene d8 537 500 107 70-120 <br /> Surrogate 4-Bromofluorobenzene 534 500 107 70-120 <br /> Laboratory Control Sample Dup(6BO8009-BSD1) Prepared&Analyzed 02/08/06 <br /> tert-Amyl methyl ether 239 050 ug/l 200 120 80-115 4 15 HL <br /> Benzene 217 050 200 108 65-115 1 20 <br /> Bromobenzene 221 050 200 110 80-120 0 35 <br /> Bromochloromethane 213 050 200 106 60-145 0 20 <br /> Bromodichloromethane 234 050 200 117 75 150 3 15 <br /> WBromoform 220 050 200 110 60-125 4 15 <br /> omomethanc 227 1 0 200 114 40-150 6 35 <br /> sec-Butylbenzene 222 050 200 111 80-130 2 15 <br /> cert-Butylbenzene 225 050 200 112 80-125 3 15 <br /> n-Butylbenzene 228 050 200 114 80-130 5 15 <br /> Carbon tetrachloride 229 050 200 114 75-140 3 20 <br /> Chlorobenzene 206 050 200 103 80-120 1 10 <br /> Chloroethane 199 1 0 200 100 75-120 2 30 <br /> Chloroform 223 050 200 112 80 125 0 15 <br /> Chloromethane 243 050 200 122 50-135 08 20 <br /> 2-Chlorotoluene 223 050 200 112 80-120 04 15 <br /> 4-Chlorotoluene 21 7 050 200 108 75-125 05 10 <br /> Di-isopropyl ether 236 050 200 118 75-125 3 15 <br /> 1,2 Dibromo-3 chloropropane 224 1 0 200 112 65-140 11 20 <br /> Dibromochloromethane 236 050 200 118 70-125 2 15 <br /> 1 2-Dibromoethane(EDB) 234 050 200 117 85-120 04 15 <br /> Dibromomethane 228 050 200 114 70-145 3 15 <br /> 1,2-Dichlorobenzene 228 050 200 114 80-125 0 10 <br /> 1,3 Dichlorobenzene 22 1 050 200 110 75 120 05 10 <br /> 1 4-Dichlorobenzene 222 050 200 111 75-120 04 15 <br /> Dichlorodifluoromethane 201 050 200 100 60 130 2 20 <br /> 1 I-Dichlorocthane 23 1 050 200 116 55-140 04 20 <br /> 1 2-Dichloroethane 215 050 200 108 85-130 2 20 <br /> 1 1-Dichloroethene 209 050 200 104 75 135 05 20 <br /> Sequoia Analytical-Morgan H111 The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stared results are reported on a wet weight basis <br /> . This analytical report must be reproduced in its entirety <br /> Page 26 of 28 <br />