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885 Jarvis Drrve <br /> ` Sequoia Morgan Hill CA 95037 <br /> ��►► <br /> 600 <br /> FAX(408)782-6308 <br /> Analytical <br /> www sequo 776 9 <br /> equoialabs coin <br /> URS Corporation[Arco ll Project BP#11194,Tracy,CA MNH0211 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number NIP Reported <br /> Sacramento CA,95833 Project Manager JeffBrooks 08/25/04 13 04 <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 °1REC Limits RPD Limit Notes <br /> Batch 4H12022-EPA 5030B Modified <br /> Laboratory Control Sample(4H12022-BSI) Prepared&Analyzed 08/12/04 <br /> tert-Amyl methyl ether 101 050 ug/l too 101 82-140 <br /> Benzene 960 0 50 10 0 96 69-124 <br /> tert-Butyl alcohol 459 20 500 92 56-131 <br /> Di-isopropyl ether 968 050 10 0 97 76-130 <br /> Ethanol 162 100 200 81 31-143 <br /> Ethyl tert-butyl ether 101 050 10 0 101 81-121 <br /> Ethylbenzene 103 0 50 10 0 103 84-132 <br /> Methyl tert-butyl ether 990 050 loo 99 63-137 <br /> Toluene 100 050 10 0 100 78-129 <br /> Xylenes(total) 31 7 050 30 0 106 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 216 250 86 78-129 <br /> aboratory Control Sample(4H 1 2022-BS2) Prepared&Analyzed 08/12/04 <br /> enzene 5 29 050 ug/l 640 83 69-124 <br /> Ethylbenzene 791 050 6 96 114 84-132 <br /> Methyl tert-butyl ether 870 050 992 88 63-137 <br /> Toluene 306 050 297 103 78-129 <br /> Xylenes(total) 384 0 50 337 114 83-137 <br /> Gasoline Range Organics(C4-C 12) 396 50 440 90 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 232 250 93 78-129 <br /> Laboratory Control Sample Dup(4H12022-BSDI) Prepared 08/12/04 Analyzed 08/13/04 <br /> ter(-Amyl methyl ether 996 050 ug/l too 100 82-140 1 20 <br /> Benzene 987 050 100 99 69-124 3 20 <br /> tert-Butyl alcohol 478 20 Soo 96 56-131 4 20 <br /> Di-isopropyl ether 964 0 50 100 96 76-130 0 4 20 <br /> Ethanol 158 100 200 79 31-143 2 20 <br /> Ethyl tert-butyl ether 987 0 50 too 99 81-121 2 20 <br /> Ethylbenzene 105 0 50 100 105 84-132 2 20 <br /> Methyl tert-butyl ether 9 54 0 50 100 95 63-137 4 20 <br /> Toluene 101 050 100 101 78-129 1 20 <br /> Xylenes(total) 322 0 50 300 107 83-137 2 20 <br /> Surrogate 1 2-Dichloroethane-d4 222 250 89 78-129 <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 14 of 16 <br />