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Sequoia 885hrve <br /> Morgan Hill1 CA CA 95037 <br /> (408)776-9600 <br /> � ► Analytical FAX(408)7826308 <br /> www sequoialabs corn <br /> URS Corporation[Arcol] Project ARCO#6020,Manteca,CA MPA 1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCI 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 - 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 6BO8009-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(6B08009-BSD/) Prepared&Analyzed 02/08/06 <br /> cis-1,2-Dichloroethene 235 050 ug/1 200 118 85-130 4 10 <br /> trans-l,2-Dichloroethene 21 2 050 200 106 70-130 0 ES <br /> 1,2-Dichloropropane 223 050 200 112 85-115 09 10 <br /> 1 3-Dichloropropane 234 050 200 117 85.115 1 10 HL <br /> 2,2-Dichloropropane 272 20 200 136 50 150 16 35 <br /> 1,1-Dichloropropene 221 050 200 110 85-125 1 15 <br /> Ethyl tcrt-butyl ether 21 7 050 200 108 75-130 2 25 <br /> Ethylbenzene 21 6 050 200 108 75-135 1 15 <br /> Hezachlorobutadtene 239 20 200 120 75-120 2 20 <br /> lsopropylbenzene 194 050 200 97 80-135 2 10 <br /> Methyl tert-butyl ether 203 050 200 102 65-125 3 20 <br /> Methylene chloride 240 050 200 120 75-135 2 15 <br /> naphthalene 244 50 " 200 122 40 150 5 30 <br /> ]sopropyltoluene 22 5 050 200 112 80-140 3 1S <br /> n-Propylbenzene 21 2 050 200 106 75-135 09 15 <br /> Styrene 21 4 050 200 107 85-130 2 10 <br /> 1,1 12-Tetrachloroethane 220 050 200 110 85-120 09 15 <br /> 1,1 2,2-Tetrachloroethane 330 050 200 165 70-140 19 20 HL <br /> Tetrachlorcethene 21 4 050 200 107 85-125 2 15 <br /> Toluene 21 5 050 200 108 85-120 3 20 <br /> 1,2,3-Tnchlorobenzene 234 050 200 117 70-135 3 20 <br /> 1 2 4-Tnchlorobenzene 222 050 200 111 70-130 1 20 <br /> 1,1 1-Trichloroethane 23 9 050 200 120 85-135 5 15 <br /> 1 1,2-Trichloroethane 224 050 200 112 85-120 1 15 <br /> Trichloroethene 165 050 200 82 60-140 11 20 <br /> Tnchlorofluoromethane 21 9 050 200 110 85-130 3 15 <br /> 1,2,3-Tnchloropropane 226 050 200 113 65-125 1 15 <br /> 1,2,4-Tnmethylbenzene 225 050 200 112 85-120 2 10 <br /> 1,3,5-Tnmethylbenzene 22 1 050 200 110 75-130 09 15 <br /> Vinyl chloride 23 3 050 200 116 55-145 04 20 <br /> Xylenes(total) 646 050 600 108 85-125 3 20 <br /> Surrogate Dibromofluoromethane 562 500 111 65-130 <br /> Surrogate 11-Dechloroethane-d4 576 500 115 60-135 <br /> Surrogate Toluene-d8 548 500 110 70-110 <br /> Surrogate 4 Bromofluorobenzene 524 500 105 70-120 <br /> Sequoia Analytical -Morgan Hili 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 we/weight bases <br /> . This analytical report must be reproduced in its entirety <br /> Page 27 of 28 <br />