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1885 Jarvis DriveSequoia Morgan HillCA 950375037 <br /> (408)775 9600 <br /> Analytical FAX 782-6308 <br /> www sequoiequoialabs corn <br /> URS Corporation[Arcoll Project ARCO 46100,Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC IY-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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5GO1012-EPA 5030E PIT/EPA 8260E <br /> Laboratory Control Sample(5G01012-13SI) Prepared&Analyzed 07/01/05 <br /> tert Amyl methyl ether 106 050 ug/I too 106 80-115 <br /> Benzene 10 1 050 100 101 65-115 <br /> Cert Butyl alcohol 585 20 500 117 75-150 <br /> Di isopropyl ether 102 050 100 102 75-125 <br /> 1 2-Dibromoethane(EDB) 1 1 0 050 too 110 85-120 <br /> 1 2-Dichloroethane 103 050 too 103 85-130 <br /> Ethanol 269 100 200 134 70-135 <br /> Ethyl tert-butyl ether 10 1 050 too 101 75-130 <br /> Ethylbenzene 11 1 050 too 111 75-135 <br /> Methyl tert-butyl ether 104 050 100 104 65-125 <br /> Toluene 10 5 050 too 105 85-120 <br /> lenes(total) 336 050 300 112 85-125 <br /> irrrogate 12-Dichloroethane-d4 224 250 90 60-135 <br /> Laboratory Control Sample(5GO1012-BS2) Prepared&Analyzed 07/01/05 <br /> Benzene 5 80 050 ugll 608 95 65-115 <br /> Ethylbenzene 903 050 784 115 75-135 <br /> Methyl Cert-butyl ether 901 050 960 94 65-125 <br /> Toluene 350 050 32 9 106 85-120 <br /> Xylenes(total) 44 l 050 385 115 85-125 <br /> Gasoline Range Organics(C4-C 12) 412 50 440 94 70-124 <br /> Surrogale 12-Dichloroethane-d4 213 250 85 60-135 <br /> Laboratory Control Sample Dup(5GO1012-BSDI) Prepared 07/01/05 Analyzed 07/02/05 <br /> tert Amyl methyl ether 104 050 ug/1 100 104 80-115 2 15 <br /> Benzene 10 2 050 100 102 65-[15 1 20 <br /> ten Butyl alcohol 469 20 500 94 75-150 22 25 <br /> Di isopropyl ether 10 1 050 100 101 75-125 1 15 <br /> 1 2-Dibromoethane(EBB) 11 3 050 t 0 0 113 85-120 3 15 <br /> 1,2-Dichloroethane 10 8 050 100 108 85-130 5 20 <br /> Ethanol 297 100 200 148 70-135 10 35 HL <br /> Ethyl tert-butyl ether 991 050 t 0 0 99 75-130 2 25 <br /> Ethylbenzene 10 8 0 50 100 108 75-135 3 15 <br /> Methyl tert-butyl ether 903 050 100 80 65-125 26 20 RB <br /> Toluene 10 5 050 100 105 85-120 0 20 <br /> Xylenes(total) 33 1 050 300 110 85-125 1 20 <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 to its entirety <br /> Page 9 of 17 <br />