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ISBS ferns Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> W Analytical www <br /> seq otalab 6308 <br /> vuww sequoealabs cam <br /> i <br /> URS Corporation[Arco 1 j Project BP Hentage#11194,Tracy,CA MOH0245 <br /> 2870 Gateway Oaks Dr,Ste 300 Project*lumber 007WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/19/05 06 53 <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 Li nut Notes <br /> Batch 5HO9039-EPA 5030B P/T/EPA 8260B <br /> Blank(5H09039-BLK1) Prepared&Analyzed 08/09/05 <br /> tent-Amyl methyl ether ND 050 ugll <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tett-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-C12) ND 50 <br /> Surrogate 12-Dichloroethane-d4 276 250 110 60-135 <br /> WabGratory Control Sample(5H09039-BSI) Prepared&Analyzed 08/09/05 <br /> tert-Amyl methyl ether 113 050 ugR 100 113 80-115 <br /> Benzene 110 050 100 110 65-115 <br /> tert Butyl alcohol 487 20 500 97 75-150 <br /> Di-isopropyl ether 117 050 100 117 75-125 <br /> Ethanol 188 100 200 94 70-135 <br /> Ethyl tert-butyl ether 107 050 100 107 75-130 <br /> Ethylbenzene 121 050 100 121 75-135 <br /> Methyl cert-butyl ether 107 050 IOU 107 65-125 <br /> Toluene 109 050 ]0 0 109 85-120 <br /> Xylenes(total) 369 050 300 123 85-125 <br /> Surrogate 12-Dichloroethane-d4 266 250 106 60-133 <br /> Laboratory Control Sample(5H09039-BS2) Prepared&Analyzed 08/09/05 <br /> Benzene 557 050 ug/1 608 92 65-115 <br /> Ethylbenzene 8 80 0 50 7 84 112 75-135 <br /> Methyl tert-butyl ether 9 13 050 9 60 95 65-125 <br /> Toluene 33 3 050 329 101 85-120 <br /> Xylenes(total) 43 0 050 385 112 85-125 <br /> Gasoline Range Organics(C4-C12) 407 50 440 92 70-124 <br /> Surrogate 12-Dichloroethane-d4 250 250 100 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply 10 the samples analyzed 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 10 of 16 <br />