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1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> '" ►� (408)700 <br /> Analytical <br /> FAX(408)78822 6308 <br /> www sequoialabs com <br /> URS Corporation(Arco 11 Project ARCO#5469 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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 5F15005- EPA 5030E P/T/EPA 8260B <br /> Laboratory Control Sample(5F15005-BS1) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyl ether 109 050 ug/l too 109 80-115 <br /> Benzene 9 71 0 50 too 97 65-115 <br /> tert-Butyl alcohol 53 l 20 500 106 75-150 <br /> Dr-isopropyl ether 102 050 too 102 75 125 <br /> 1 2-Dibromoethane(EDB) 946 050 too 95 85-120 <br /> 1 2-Dichloroethane 10 7 0 50 100 107 85-130 <br /> Ethanol 221 too 200 110 70-135 <br /> Ethyl tert butyl ether 995 0 50 too 100 75-130 <br /> Ethylbenzene 936 050 100 94 75-135 <br /> Methyl tert-butyl ether 10 1 050 too 101 65-125 <br /> Toluene 960 050 100 96 85-120 <br /> 0ylenes(total) 304 050 300 101 85 125 <br /> rrogate 12-Drchloroethane-d4 484 5 00 97 60-135 <br /> Laboratory Control Sample(5F15005-BS2) Prepared&Analyzed 06/15/05 <br /> Benzene 560 050 ugA 6 08 92 65-115 <br /> Ethylbenzene 742 050 784 95 75-135 <br /> Methyl tert butyl ether 831 050 960 87 65-125 <br /> Toluene 345 050 329 105 85-120 <br /> Xylenes(total) 42 8 050 385 111 85-125 <br /> Gasoline Range Organics(C4-C12) 366 50 440 83 70-124 <br /> Surrogate 12 Drchloroethane-d4 389 500 78 60-135 <br /> Laboratory Control Sample Dup(5F15005-BSD1) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyl ether 12 l 050 ug/I 100 121 80-115 10 15 HL <br /> Benzene 107 050 100 107 65-115 10 20 <br /> tert-Butyl alcohol 55 3 20 Soo 111 75-150 4 25 <br /> Di-isopropyl ether 114 050 100 114 75-125 11 15 <br /> l 2-Dlbromoethane(EDB) 101 050 too 141 85-120 7 15 <br /> 1 2-Drchloroethane 117 050 100 117 85-130 9 20 <br /> Ethanol 256 100 200 128 70-135 15 35 <br /> Ethyl tent-butyl ether 110 050 100 110 75-130 10 25 <br /> Ethylbenzene 986 050 100 99 75-135 5 15 <br /> Methyl tert-butyl ether 10 8 050 too 108 65-125 7 20 <br /> Toluene 102 050 ion 102 85-120 6 20 <br /> Xylenes(total) 31 9 050 300 106 85-125 5 20 <br /> Sequoia Analytical -Morgan Hill The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 20 <br />