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/885 a 9600 <br /> SQf1u Ola Morgan Hill CA 95037 <br /> `1 (A08))77 776 9600 <br /> �W Analytical www <br /> seq 8)slabs c m <br /> www sequoialabs cam <br /> 0 <br /> URS Corporation[Arco I1 Project ARCO#45469,Stockton,CA MOF0335 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/23/05 15 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %PEC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5F16006- EPA 5030B PIT/EPA 8260E <br /> Laboratory Control Sample(5F16006-BS2) Prepared&Analyzed 06/16/05 <br /> Benzene 539 0 50 ug/l 6 08 89 65-115 <br /> Ethylbenzene 758 0 50 784 97 75-135 <br /> Methyl tert-butyl ether 838 0 50 960 87 65-125 <br /> Toluene 350 050 32 9 106 85-120 <br /> Xylenes(total) 45 2 0 50 38 5 117 85-125 <br /> Gasoline Range Organics(C4 C12) 394 50 440 90 70-124 <br /> Surrogate 12-Drchloroethane-d4 450 500 90 60-135 <br /> Laboratory Control Sample Dup(5F16006-BSD2) Prepared&Analyzed 06/16/05 <br /> Benzene 566 050 ug/I 608 93 65-115 5 20 <br /> Ethylbenzene 7 95 050 7 84 101 75-135 5 15 <br /> Methyl tert-bury]ether 856 050 960 89 65-125 2 20 <br /> Toluene 362 050 32 9 110 85-120 3 20 <br /> Xylenes(total) 44 1 050 385 115 85-125 2 20 <br /> Gasoline Range Organics(124 C12) 389 50 440 88 70-124 1 20 <br /> Surrogate 1 2-Dichloroethane-d4 458 500 92 60-135 <br /> Matrix Spike(5F16006-MSI) Source MOF0396-01 Prepared&Analyzed 06/16/05 <br /> tert-Amyl methyl ether 60 8 2 5 ug/l 500 ND 122 80-115 LM <br /> Benzene 55 0 2 5 500 090 108 65-115 <br /> tert-Butyl alcohol 377 25 250 97 112 75-120 <br /> Di-isopropyl ether 56 5 2 5 500 ND 113 75-125 <br /> 1 2-Dibromoethane(EDB) 53 3 2 5 500 ND 107 85-120 <br /> 1 2-Dichloroethane 608 25 " 500 ND 122 85-130 <br /> Ethanol 1370 500 1000 ND 137 70-135 LM <br /> Ethyl Cert-butyl ether 548 25 500 ND 110 75-130 <br /> Ethylbenzene 492 2 5 500 1 9 95 75-135 <br /> Methyl tert-butyl ether 238 2 5 500 190 96 65-125 <br /> Toluene 53 4 2 5 50 0 ND 107 85-120 <br /> Xylenes(total) 164 2 5 150 ND 109 85-125 <br /> Surrogate 1 2-Dichloroethane-d4 330 500 106 60-135 <br /> Sequoia Analytical-Morgan Hill The results to this report apply to the samples analy-zed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis 40This analytical report must be reproduced in its entirety <br /> Page 16 of 20 <br />