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885 lams Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> Analytical FAX cquoia782-6309com <br /> www sequoiatabs com <br /> URS Corporation(Arco I] Project ARCO#2130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/04/06 16 01 <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 5L21024-EPA 5030B PIT 1 EPA 8260B <br /> Blank(SL21024-BLKI) Prepared&Analyzed 12/21/05 <br /> tert-Amyl methyl ether ND 050 ugA <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2 Dichloroethane ND 050 <br /> Ethanol ND 100 IC <br /> Ethyl tert butyl ether ND 050 <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> A1111110asolme Range Organics(C4 C12) ND 50 " <br /> Surrogate I 1-Drchloroethane-d4 247 250 99 60-135 <br /> Laboratory Control Sample(5L21024-BSI) Prepared&Analyzed 12/21/05 <br /> tert-Amy)methyl ether 143 050 ug/l 150 95 80-115 <br /> Benzene 601 050 5 16 116 65-115 HL <br /> tert-Butyl alcohol 182 20 143 127 75-150 <br /> Di-isopropyl ether 185 050 151 123 75-125 <br /> 1 2-Dichloroethane 148 050 147 101 85 130 <br /> Ethanol 530 100 142 373 70-135 HL,IC <br /> Ethyl tert butyl ether 169 050 15 0 113 75-130 <br /> hthylbenzene 713 050 7 54 95 75-135 <br /> Methyl ter(-butyl ether 692 050 702 99 65-125 <br /> Toluene 41 5 050 372 112 85-120 <br /> Xylenes(total) 40 1 0 50 41 2 97 85-125 <br /> Gasoline Range Organics(C4-C 12) 574 50 440 130 60-140 <br /> Surrogate 12-Dichloroethane d4 206 250 82 60-135 <br /> Sequoia Analytical-Morgan Hill 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 28 <br />