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1885 Jarvis Dnve <br /> Sequoia Morgan H u 11 CA 95037037 <br /> 4D— <br /> (448)7769600 <br /> Analytical <br /> FAX(408)782-6308 <br /> www sequoualabs corn <br /> URS Corporation[ArcoI l Project ARCO 46100,Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 Y-0003 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/22/05 16 37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source 0/.RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5G12011 -EPA 50308 PIT/EPA 8260B <br /> Laboratory.Control Sample(5612011-BS3) Prepared&Analyzed 07/12/05 <br /> tert-Amyl methyl ether 115 050 ugA too 115 80-115 <br /> Benzene ll 0 050 100 110 65-115 <br /> tort-Butyl alcohol 586 20 500 117 75-150 <br /> Di-isopropyl ether l 1 0 050 100 110 75 125 <br /> 1,2-Dibromoethane(EDB) 11 7 050 10 0 117 85-120 <br /> l 2-Dichloroethane 11 3 050 too 113 85 130 <br /> Ethanol 202 100 200 101 70-135 <br /> Ethyl tert-butyl ether 11 1 050 10 0 1 1 1 75-130 <br /> Ethylbenzene 106 050 10 0 106 75 135 <br /> Methyl tert-butyl ether 11 0 050 100 110 65-125 <br /> Toluene 105 0 50 too 105 85-120 <br /> ,dII&lencs(total) 324 050 300 108 85 125 <br /> rrrogate 12-Dichloroethane-d4 2 59 250 104 60-135 <br /> Laboratory Control Sample Dup(5G12011-BSDI) Prepared&Analyzed 07/12/05 <br /> tert-Amyl methyl ether 102 050 ugil 100 102 80-115 1 15 <br /> Benzene ll 5 050 to 0 115 65-115 0 20 <br /> tert-Butyl alcohol 54 7 20 500 109 75-150 29 25 RB <br /> Di-isopropyl ether 105 050 10 0 105 75-125 1 15 <br /> 1,2-Dibromoethane(EDB) 101 050 10 0 101 85-120 1 15 <br /> 1,2 Dichloroethane 100 050 100 100 85-130 0 3 20 <br /> Ethanol 251 100 200 126 70-135 50 35 RB <br /> Ethyl tort-butyl ether 10 1 0 50 too 101 75 130 3 25 <br /> Ethylbenzene 116 050 too 116 75-135 0 15 <br /> Methyl tert-butyl ether 997 050 1100 100 65-125 3 20 <br /> Toluene 11 1 050 100 1 1 1 85-120 0 9 20 <br /> Xylenes(total) 347 050 300 116 85-125 0 6 20 <br /> Surrogate 12-Dichloroethane-d4 213 150 89 60-135 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 4D This analytical report must be reproduced to its entirety <br /> Page 15 of 17 <br />