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885 Jarvis Dnve <br /> Sequoia Morgan Ha CA 95037 <br /> (408)776 9600 <br /> FAX 8308 <br /> Analytical wwwsegtwialabs com <br /> URS Corporation rArcoII Project BP#11194,Tracy,CA MNH0211 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 08/25/04 13 04 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %RITC RPD <br /> An Result Limit Units Level Result %REC Limits RPD I emit Nates <br /> Batch 4H11003-EPA 5030E PIT <br /> Laboratory Control Sample Dup(4H11003-BSD1) Prepared&Analyzed 08/11/04 <br /> Cert-Amyl methyl ether 120 050 ug/l 100 120 82-140 15 20 <br /> Benzene 102 050 100 102 69-124 1 20 <br /> tent-Butyl alcohol 542 20 500 108 56-131 8 20 <br /> Di-isopropyl ether 11 8 050 100 118 76-130 18 20 <br /> Ethanol 165 100 200 82 31-143 4 20 <br /> Ethyl tert-butyl ether 116 050 100 116 81-121 14 20 <br /> Ethylbenzene 13 1 050 " 100 131 84-132 11 20 <br /> Methyl tert-butyl ether 965 050 100 96 63-137 1 20 <br /> Toluene 15 7 050 100 157 78-129 30 20 HL,BA <br /> Xylenes(total) 365 050 300 122 83-137 5 20 <br /> Surrogate 1 2-Dichloroeihane-d4 414 500 83 78-129 <br /> AIINIII aboratory Control Sample Du (4H11003-BSD2) Prepared&Analyzed 08/11/04 <br /> asoline Range Organics(C4-C 12) 412 50 ug/l 440 94 70-124 11 20 <br /> Surrogate 1 2-Dichloroethane-d4 436 500 87 78-124 <br /> Batch 4H12002-EPA 5030B PIT <br /> Blank(41112002-BLK1) Prepared&Analyzed 08/12/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> De-Isopropyl ether ND 050 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate I 1-Dichloroethane-d4 4 88 500 98 78-119 <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 stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 16 <br />