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885Drive <br /> Sequoia Morgan Hill1 CA CA 95037 <br /> (408)776 9600 <br /> a- -) Analytical FAX(408)7826308 <br /> www sequoialabs com <br /> URS Corporation FArco I I Project ARCO 46100,Tracey,CA M0I0662 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOC I Y-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson _ _ __ 10/03/05 17 30__ _ <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 5130006- EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5130006-BS1) Prepared&Analyzed 09/30/05 <br /> Cert-Amyl methyl ether 147 050 ug/l 150 98 80-115 <br /> Benzene 524 0 50 5 16 102 65-115 <br /> tert-Butyl alcohol 150 20 143 105 75-150 <br /> Di-isopropyl ether 155 050 151 103 75-125 <br /> 1,2-Dibromoethane(EDB) 163 0 50 14 8 110 85-120 <br /> 1 2-Dichloroethane 15 1 050 14 7 103 85-130 <br /> Ethanol 181 100 141 I28 70-135 <br /> Ethyl tert-butyl ether 144 050 150 96 75-130 <br /> Ethylbenzene 637 050 7 54 84 75-135 <br /> Methyl tert-butyl ether 7 18 050 702 102 65-125 <br /> Toluene 36 8 050 372 99 85-120 <br /> 0 <br /> es(total) 41 7 050 414 101 85-125 <br /> me Range Organics(C4-C12) 510 50 440 116 70-124 <br /> Surrogate 12-Dichloroethane-d4 500 500 100 60-135 <br /> Laboratory Control Sample(5130006-BS2) Prepared&Analyzed 09/30/05 <br /> tert-Amyl methyl ether 14 5 050 ug/l 15 0 97 80-115 <br /> Benzene 500 050 5 16 97 65-115 <br /> tert-Butyl alcohol 155 20 143 108 75-150 <br /> Di-isopropyl ether 15 2 050 15 1 101 75-125 <br /> 1 2-Dibromoethane(EDB) 16 8 050 148 114 85-120 <br /> 1 2-Dichloroethane 14 7 050 14 7 100 85-130 <br /> Ethanol 168 100 141 119 70-135 <br /> Ethyl tert-butyl ether 14 3 050 150 95 75-130 <br /> Ethylbenzene 645 050 754 86 75-135 <br /> Methyl tert-butyl ether 694 050 702 99 65-125 <br /> Toluene 36 4 050 372 98 85-120 <br /> Xylenes(total) 39 l 050 41 4 94 85-125 <br /> Gasoline Range Organics(C4-C12) 474 50 440 108 70-124 <br /> Surrogate 12-Dichloroethane-d4 444 5 00 89 60-135 <br /> vola Analytical-Morgan Hill The results to this report apply 10 the samples analy_ed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 1 I of 16 <br />