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885 Jams Drrvc <br /> IDSequoia Morgan Mill.CA 95037 <br /> (408)776-9600 <br /> Analytical <br /> FAX Ax equoi labs c m <br /> WWW sequotalabs coni <br /> URS Corporation[Arco II Project BP#11I94,Tracy,CA NINHO211 <br /> 2870 Gateway Oaks Dr,Ste 300 Prgjmt Number NIP Reported <br /> Sacramento CA,95833 ProlectManager IeffBrooks 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 emits Level Result °/WEC LIMES RPD Limit Notes <br /> Batch 4H12002-EPA 5030B P/T <br /> Matrix Spike(4H12002-MSI) Source MNH0211-15 Prepared&Analyzed 08/12/04 <br /> Benzene 323 25 ug/l. 320 14 97 69-124 <br /> Ethylbenzene 472 25 348 17 131 84-132 <br /> Methyl tert-butyl ether 392 25 496 28 73 63 137 <br /> Toluene 2040 25 1480 40 138 78-129 LM <br /> Xylenes(total) 2200 25 1680 ND 131 83-137 <br /> Gasoline Range Organics(C4-C12) 23800 2500 22000 5500 83 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 434 500 87 78-129 <br /> Matrix Spike Dup(4H12002-MSD1) Source MNH0211-15 Prepared&Analyzed 08/12/04 <br /> Benzene 350 25 ug/l 320 14 105 69-124 8 20 <br /> Ethylbenzene 514 25 348 17 143 84-132 9 20 LM <br /> Methyl tert-butyl ether 560 25 496 28 107 63-137 35 20 RB <br /> WYl,uene <br /> 2 E 10 25 1480 4 0 142 78-129 3 20 LM <br /> enes(total) 2290 25 1680 ND 136 83 137 4 20 <br /> Gasoline Range Organics(C4-C12) 26700 2500 22000 5500 96 70-124 11 20 <br /> Surrogate 1,2-Dechloroethane-d4 491 500 98 78-129 <br /> Batch 4H12022-EPA 5030B Modified <br /> Blank(4H12022-BLK1) Prepared&Analyzed 08/12/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tort-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 2-Drchloroethane-d4 215 250 86 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 13 of 16 <br />