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8Hi JarvisDrive <br /> Sequoia Morgan Hill CA 95503737 <br /> (408)776-9600 <br /> FAX(408)782-6308 <br /> mrd Analytical <br /> www sequoralabs coin <br /> 0 <br /> URS Corporation[Arco II Project ARCO#6100,Tracey, CA MOI0662 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCIY-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 5JO1004-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5JO1004-BSZ) Prepared&Analyzed 10/01/05 <br /> tert-Amyl methyl ether 155 050 ug/l 150 103 80-115 <br /> Benzene 561 050 5 16 109 65-115 <br /> tert-Butyl alcohol 142 20 143 99 75-150 <br /> Di-isopropyl ether 155 050 151 103 75-125 <br /> t 2-Drbromoethane(EDB) 148 050 148 100 85-120 <br /> 1 2-Dichloroethane 162 050 147 110 85-130 <br /> Ethanol 175 100 141 124 70435 <br /> Ethyl tert-butyl ether 158 050 150 105 75-130 <br /> Ethylbenzene 766 050 754 102 75-135 <br /> Methyl tert-butyl ether 756 050 702 108 65-125 <br /> Toluene 359 050 372 97 85-120 <br /> (total) 448 050 414 108 85-125 <br /> *n.23 <br /> hne Range Organics(C4-C12) 504 50 440 115 70-124 <br /> Surrogate 12-Diehloroethane-d4 247 250 99 60-135 <br /> Laboratory Control Sample Dup(5JO1004-BSD2) Prepared 10/01/05 Analyzed 10/02/05 <br /> tert-Amyl methyl ether 148 050 ug/1 150 99 80-t 15 5 Is <br /> Benzene 538 050 5 16 108 65-115 0 5 20 <br /> tert-Butyl alcohol 164 20 143 115 75-150 14 25 <br /> Di-isopropyl ether ISO 050 151 99 75-125 3 15 <br /> 1,2-Dibromoethane(EDB) 14 6 050 148 99 85-120 1 15 <br /> 1 2-Drchloroethane 163 050 14 7 111 85-130 0 6 20 <br /> Ethanol 184 100 141 130 70-135 5 35 <br /> Ethyl ten-butyl ether 148 050 15 0 99 75-130 7 25 <br /> Ethylbenzene 757 050 754 100 75-I35 1 15 <br /> Methyl tert-butyl ether 669 050 7 02 95 65-125 12 20 <br /> Toluene 364 0 50 372 98 85-I20 1 20 <br /> Xylenes(total) 466 0 50 414 113 85-125 4 20 <br /> Gasoline Range Organics(C4-C12) 490 50 440 Ill 70-124 3 20 <br /> Surrogate 1 2-Drchloroethane-d4 247 2 50 99 60-135 <br /> uoia Analytical-Morgan Hill The results in this report apply to the samples analy-ed 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 14 of 16 <br />