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885 Jarvis <br /> Sequoia <br /> Morgan Hill CA 950375037 <br /> (408)776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> • <br /> URS Corporation[Arco II Project ARCO#6020,Manteca,CA MPA 1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC1 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 6B08009-EPA 5030B P/T/EPA 8260B <br /> Blank(6BO8009-BLK1) Prepared&Analyzed 02/08/06 <br /> Tnchloroethene ND 050 ug/1 <br /> Tnchlorofluoromethane ND 050 " <br /> 1,2,3-Triehloropropane ND 050 " <br /> 1,2,4-Tnmethylbenzene ND 050 " <br /> 1,3,5-Tnmethylbenzene ND 050 " <br /> Vinyl chloride ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 552 500 110 65-130 <br /> Surrogate 1 2-Dichloroethane-d4 576 500 115 60-135 <br /> Surrogate Toluene d8 516 500 105 70-110 <br /> Surrogate 4-Bromofluorobenzene 492 500 98 70-110 <br /> mj�aboratory Control Sample(6BO8009-BS1) Prepared&Analyzed 02/08/06 <br /> -Amyl methyl ether 230 050 ug/I 200 115 80-115 <br /> enzene 21 4 050 200 107 65-115 <br /> Bromobemzene 22 1 050 200 110 80-120 <br /> Bromochloromethane 21 3 050 200 106 60-145 <br /> Bromodtchloromethane 242 050 200 121 75-150 <br /> Bromoform 228 050 200 114 60-125 <br /> Bromomethane 214 1 0 200 107 40-150 <br /> sec-Butylbenzene 218 050 200 109 80-130 <br /> ter(-Butylbenzene 21 8 050 200 109 80-125 <br /> n-Butylbenzene 21 6 050 200 108 80-130 <br /> Carbon tetrachloride 223 050 200 112 75-140 <br /> Chlorobenzene 209 050 200 104 80-120 <br /> Chloroethane 203 1 0 200 102 75-120 <br /> Chloroform 223 050 200 112 80-125 <br /> Chloromethane 241 050 200 120 50-135 <br /> 2 Chlorotoluene 222 050 200 111 80-120 <br /> 4-Chlorotoluene 21 6 050 200 108 75-125 <br /> Di-isopropyl ether 230 050 200 115 75-125 <br /> 1,2-Dibromo-3-chloropropane 250 10 200 125 65-140 <br /> Dibromochloromethane 231 050 200 116 70-125 <br /> 1,2-Dibromoethane(EDB) 233 050 200 116 85-120 <br /> Dibromomethane 234 050 200 117 70-145 <br /> 1 2-Dichlorobenzene 228 050 200 114 80-125 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analy2ed 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 24 of 28 <br />