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i <br /> 1885 Jarvis Drive <br /> ( , Seuoia Morgan 410 CA 95037 <br /> Analytical 8)776 9600 <br /> FAX(408)782 6308 <br /> Analytical WWW sequoialabscol <br /> 0 <br /> J <br /> URS Corporation[Arcoil y' <br /> Project ARCO 46100 Trace CA MOF0491 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCIY-0003/7 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/17/05 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 5F15006- EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(5FI5006-BSDI) Prepared&Analyzed 06/15/05 <br /> tert-Amyl methyl ether 121 050 mg/ml Air 100 121 80-115 10 15 HL <br /> Benzene 107 050 100 107 65-115 10 20 <br /> tert-Butyl alcohol 55 3 20 500 1 l 1 75-150 4 25 <br /> Di-isopropyl ether 1 1 4 050 too 114 75-125 11 15 <br /> Ethyl tert butyl ether 110 050 100 110 75-130 l0 25 <br /> Ethylbenzene 986 050 100 99 75-135 5 15 <br /> Methyl tert-butyl ether 108 050 100 108 65-125 7 20 <br /> Toluene 102 050 100 102 85-120 6 20 <br /> Xylenes(total) 31 9 050 300 106 85-125 5 20 <br /> Surrogate 12 Dichloroethane-d4 518 500 104 60-135 <br /> Laboratory Control Sample Dup(5F15006-BSD2) Prepared 06/15/05 Analyzed 06/16/05 <br /> Benzene 601 0 50 mg/m'Air 608 99 65-115 7 20 0 <br /> Ethylbenzene 793 050 784 101 75-135 7 15 <br /> Methyl tert-butyl ether 921 050 960 96 65-125 10 20 <br /> Toluene 380 050 329 116 85-120 10 20 <br /> Xylenes(total) 456 050 385 118 85-125 6 20 <br /> Gasoline Range Organics(C4-C 12) 408 50 440 93 70-124 11 20 <br /> Surrogate 12-Drchloroetharre-d4 4 71 500 94 60-135 <br /> Batch 5F16009-EPA 5030B PfT/EPA 8260B <br /> Blank(5F16009-BLK1) Prepared&Analyzed 06/16/05 <br /> tert-Amyl methyl ether ND 050 mg/ml Air <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 1-Dichloroethane-d4 4 66 5 00 93 60-135 <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 in its entirety <br /> Page 12 of IS <br />