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885 lams Drive <br /> Sequoia Morgan Hill CA 95037 <br /> 4D— (408)776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs corn <br /> URS Corporation[Arco II Project ARCO#5469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Resnit Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C29006-EPA 5030B P/T/EPA 8260E <br /> Laboratory Control Sample(5C29006-BSI) Prepared&Analyzed 03/29/05 <br /> tert-Amyl methyl ether 108 050 ug/l 100 108 80-115 <br /> Benzene 945 050 100 94 65-115 <br /> tert-Butyl alcohol 48 5 20 Soo 97 75-150 <br /> Di-tsopropyl ether 1 1 0 0 50 100 110 75-125 <br /> 1,2-Dtbromoethane(EDB) 9 75 0 50 100 98 85-120 <br /> 1 2-Dichloroethane 113 050 100 113 85-130 <br /> Ethanol 176 too 200 88 70-135 <br /> Ethyl tert-butyl ether I l 2 050 100 112 75-130 <br /> Ethylbenzene 922 050 100 92 75-135 <br /> Methyl tert-butyl ether 1 l 4 0 50 100 114 65-125 <br /> 933 050 100 93 85-120 <br /> w0c. <br /> (total) 29 2 050 300 97 85-125 <br /> Surrogate 12-Dichloroethane-d4 523 500 105 60-135 <br /> Laboratory Control Sample(5C29006-BS2) Prepared&Analyzed 03/29/05 <br /> Benzene 540 050 ug/t 640 84 65-115 <br /> Ethylbenzene 8 13 050 7 52 108 75-135 <br /> Methyl tert-butyl ether 950 050 992 96 65-125 <br /> Toluene 32 5 050 31 9 102 85-120 <br /> Xylenes(total) 41 2 050 366 113 85-125 <br /> Gasoline Range Organics(C4-C 12) 410 50 440 93 70-124 <br /> Surrogate 12-Dichloroethane-d4 530 500 166 60-135 <br /> Laboratory Control Sample Dup(5C29006-BSDI) Prepared&Analyzed 03/29/05 <br /> tert-Amyl methyl ether 108 050 ug/l too 108 80-115 0 15 <br /> Benzene 100 050 100 100 65-115 6 20 <br /> tert-Butyl alcohol 503 20 500 101 75-150 4 25 <br /> Di-isopropyl ether 108 050 too IN 75-125 2 15 <br /> 1,2-Dtbromoethane(EDB) 9 83 050 100 98 85-120 08 15 <br /> 1,2-Dichloroethane 11 9 050 100 119 85-130 5 20 PE <br /> Ethanol 170 100 200 85 70-135 3 35 <br /> Ethyl tert-butyl ether 11 3 050 100 113 75-130 09 25 <br /> Ethylbenzene 9 87 050 100 99 75-135 7 15 <br /> Methyl tert-butyl ether 11 3 050 100 113 65-125 09 20 <br /> Toluene 956 050 100 96 85-120 2 20 <br /> Xylenes(total) 320 050 300 107 85-125 9 20 <br /> uota 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 entirely <br /> Page 22 of 30 <br />