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T- <br /> Sequoia 885 Jarvis Drive <br /> Morgan Hill CA 95037 <br /> 5037 <br /> r a— ) (408)776-9600 <br /> Analytical <br /> FAX(408)7$2-6308 <br /> www sequoialabs com <br /> • <br /> URS Corporation[ArcoIl 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 82601B -Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6BO8009-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(6BO8009-BSI) Prepared&Analyzed 02/08/06 <br /> 1 3-Dichlorobenzene 220 050 ug/1 200 110 75-120 <br /> 1,4-Dichlorobenzene 223 050 200 112 75-120 <br /> Dichlorodifluoromethane 205 050 200 102 60-130 <br /> 1,1 Dichloraethane 230 050 200 115 55-140 <br /> 1,2-Dichloroethane 210 050 200 105 85-130 <br /> 1,1-Dichloroethene 208 050 200 104 75-135 <br /> cis-1,2-Dichloroethene 226 050 200 113 85-130 <br /> trans-1 2-Dichloroethene 212 050 200 106 70-130 <br /> 1,2-Dichloropropane 22 1 050 200 110 85-115 <br /> 1,3-Dichloropropane 23 1 050 200 116 85-115 HL <br /> 2,2-Dichloropropane 23 1 20 200 116 50-150 <br /> 1,1-Dichloropropene 21 8 050 200 109 85-125 <br /> eyl tert butyl ether 21 2 050 200 106 75 130 <br /> ylbenzene 21 9 050 200 110 75-135 <br /> Hexachlorobutadiene 234 20 " 200 117 75 120 <br /> Isopropylbenzene 198 050 200 99 80-135 <br /> Methyl tert-butyl ether 209 050 200 104 65 125 <br /> Methylene chlonde 236 050 200 118 75-135 <br /> Naphthalene 23 1 50 200 116 40-150 <br /> p-isopropyltoluene 21 9 050 200 110 80 140 <br /> n Propylbenzene 21 0 050 200 105 75-135 <br /> Styrene 21 8 050 200 109 85 130 <br /> 1,1,1,2-Tetrachloroethane 222 050 200 111 85-120 <br /> 1,1,2,2-Tetrachloroethane 27 3 050 200 136 70-140 <br /> Tetrachloroethene 210 050 200 105 85-125 <br /> Toluene 208 050 200 104 85-120 <br /> 1,2,3-Tnchlorobenzene 227 050 200 114 70-135 <br /> 1,2 4 Tnchlorobenzene 21 9 050 200 110 70-130 <br /> 1,1,1-Tnchloroethane 22 7 0 50 200 114 85-135 <br /> 1,1,2-Tnchloroethane 221 050 200 110 85-120 <br /> Trichloroethene 185 050 200 92 60 140 <br /> Tnchloro0uoromethane <br /> 21 3 050 200 106 85-130 <br /> 1,2,3 Tnchloropropane 22 9 0 50 200 114 65-125 <br /> 1,2,4-Tnmethylbenzene 221 050 200 110 85-120 <br /> 1 3,5 Tnmethylbenzene <br /> 21 9 0 50 <br /> 200 110 75-130 I <br /> Vinyl chlonde 232 050 20 0 116 55-145 <br /> Sequoia Analytical-Morgan Hill <br /> g The results in this report apply to the samples analyzedin accordance with the chat#of <br /> custody document Unless otherwise stated results are reported on a wet weight ba.Yu <br /> • This analytical report must be reproduced in its entirety <br /> Page 25 of 28 <br />