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j) Sequoia Morgan Hill Drive(408)700 <br /> Analytical <br /> FAX(4D8)788226309 <br /> www sequotalabs com <br /> URS Corporation[Areal] Project ARCO#6100,Tracey,CA M0140072 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC1 Y-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 08/05/05 10 25 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hell <br /> Reporting Spike Source 0 REC RPD <br /> Analyte Result Limit Units Level Result 0 REC Limits RPD Limit Notes <br /> Batch 5HO3004-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(5H03004-BSDI) Prepared&Analyzed 08/03/05 <br /> tert-Amyl methyl ether 259 0 12 ppmv 240 108 80-115 4 15 <br /> Benzene 3 51 016 3 14 112 65-115 6 20 <br /> tert-Butyl alcohol 16 0 66 16 5 97 75-150 06 25 <br /> Di-isopropyl ether 246 012 240 102 75-125 7 15 <br /> Ethyl ter(-butyl ether 253 0 12 2 40 105 75-130 6 25 <br /> Ethylbenzene 2 15 0 12 2 31 93 75-135 4 15 <br /> Methyl tert-butyl ether 305 0 14 2 78 110 65-125 2 20 <br /> Toluene 30-3 0 13 266 114 85-120 6 20 <br /> Xylenes(total) 629 012 6 92 91 85-125 2 20 <br /> Surrogate 12-Dtchloroethane-d4 0 582 0 594 98 60-135 <br /> Laboratory Control Sample Dup(5H03004-BSD2) Prepared&Analyzed 08/03/05 <br /> ewene 194 0 16 ppmv t 91 102 65-115 7 20 <br /> thylbenzene 1 67 012 1 81 92 75-135 4 15 <br /> Methyl tent-butyl ether 264 0 14 267 99 65-125 7 20 <br /> Toluene 100 0 13 974 114 85-120 3 20 <br /> Xylenes(total) 8 15 012 8 88 92 85-125 3 20 <br /> Gasoline Range Organics(C4-C 12) 120 14 125 96 70-124 7 20 <br /> Surrogate 12-Dtchloroethane-d4 0 563 0 594 95 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analy_ed in accordance with the chain of <br /> • custody document Unless otherwise stated results are reported on a Iver weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 11 <br />