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ve <br /> 885 spC101a Morgan Hill CA 95037 <br /> a_ � (40a) <br /> 776-9600 <br /> Analytical FAX(408)782 6308 <br /> www sequotalabs corn <br /> URS Corporation[ArcoI 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 5L21028-EPA 5030E PIT/EPA 8260E <br /> Blank(5L21028-BLK1) Prepared 12/21/05 Analyzed 12/22/05 <br /> tert Amyl methyl ether ND 050 ugll <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 " <br /> Ethyl tent-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 /> iftsolme Range Organics(C4 C12) ND 50 <br /> urrogale 1 2-Dichloroethane-d4 2 03 1 50 81 60-135 <br /> Laboratory Control Sample(5L21028-BSI) Prepared 12/21/05 Analyzed 12/22/05 <br /> tert-Amyl methyl ether 9 92 050 ugll 100 99 80-115 <br /> Benzene 110 050 100 110 65-115 <br /> tert Butyl alcohol 41 8 20 500 84 75-150 <br /> Di-isopropyl ether 106 050 100 106 75425 <br /> 1 2 Dichloroethaue 11 5 050 100 115 85-130 <br /> Ethanol 200 100 200 100 70-135 <br /> Ethyl tert-butyl ether 102 050 100 102 75-130 <br /> Ethylbenzene 960 050 100 96 75-135 <br /> Methyl tert butyl ether 126 050 100 126 65 125 HL <br /> Toluene 108 050 100 108 85-120 <br /> Xylenes(total) 307 050 300 102 85-125 <br /> Surrogate 1 2-Dichloroethane-d4 239 150 96 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 17 of 28 <br />