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Sequoia 8855037 <br /> Morgan Hill1 CA CA 95037 <br /> (408)776 9600 <br /> IZW Analytical FAX(408)782-6308 <br /> www sequo=alabs com <br /> • <br /> URS Corporation[Arco I] Project ARCO#6020,Manteca,CA MPA 1407 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number 60C 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 6BO8003-EPA 5030B P/T I EPA 8260B <br /> Blank(61308003-BLKI) Prepared&Analyzed 02/08/06 <br /> tert-Butyl alcohol ND 20 ugll <br /> Ethanol ND 300 IC <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dtchloroethane-d4 308 250 113 60-135 <br /> Laboratory Control Sample(61308003-BSI) Prepared 02/08/06 Analyzed 02/09/06 <br /> tert-Butyl alcohol 154 20 ug/l 169 91 75-150 <br /> Ethanol 290 300 165 176 70-135 HL,IC <br /> Gasoline Range Organics(C4-C12) 554 50 440 126 60-140 <br /> Surrogate 12-Dichloroethane-d4 285 250 114 60-135 <br /> Laboratory Control Sample Dup(61308003-BSDI) Prepared 02/08/06 Analyzed 02/09/06 <br /> 0atent-Butyl alcohol 156 20 ugfl 169 92 75-150 1 25 <br /> hanol 341 300 165 207 70-135 16 35 HL,IC <br /> s.1ine Range Organics(C4-C12) 524 50 440 119 60-140 6 25 <br /> Surrogate 12-Dichloroethane-d4 187 250 115 60-135 <br /> Batch 6BO8009-EPA 5030B PIT/EPA 8260B <br /> Blank(6BO8009-BLKI) Prepared&Analyzed 02/08/06 <br /> tert-Amyl methyl ether ND 050 ug/I <br /> Benzene ND 050 " <br /> Bromobenzcne ND 050 " <br /> Bromochloromethane ND 050 " <br /> Bromodtchloromethane ND 050 " <br /> Bromoform ND 050 <br /> Bromometbane ND l0 " <br /> sec-Butylbenzene ND 0 50 " <br /> tert-Buty]benzene ND 050 " <br /> n-Butylbenzene ND 050 " <br /> Carbon tetrachloride ND 050 <br /> Chlorobenzene ND 050 <br /> Chloroethane ND 10 " <br /> Chloroform ND 050 <br /> Chloromethane ND 050 " <br /> 2 Chlorotoluene ND 050 " <br /> 4-Chlorotoluene ND 050 <br /> Sequoia Analytical -Morgan Hill <br /> g The results in this report apply to the samples analyzed in accordance with he chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 22 of 28 <br />