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885 Jkms Drive <br /> Sequoia Morgan 95437 <br /> (40 77 <br /> (408)776 9600 <br /> Analytical 782-6309 <br /> sequalaba corn <br /> s <br /> URS Corporation(Arco 11 Project BP#11194,Tracy,CA MNH0211 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number NIP 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 °/vREC RPD <br /> Analyte Result Limit Units Level Result v/uREC Lxmrts RPD Limit Notes <br /> Batch 4H11003-EPA 5030B Pf1' <br /> Blank(4H11003-BLKI) Prepared&Analyzed 08/11/04 <br /> tert-Amyl methyl ether ND 050 ug/1 <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzenc ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> lrrogate 1 2-Dichloroethane-d4 488 500 98 78-119 <br /> u <br /> aboratory Control Sample(4H11003-BSI) Prepared&Analyzed 08/11/04 <br /> tert-Amyl methyl ether 103 050 ug/I 100 103 82-140 <br /> Benzene 101 050 100 101 69-124 <br /> tert-Butyl alcohol 502 20 " 500 100 56-131 <br /> Di-isopropyl ether 983 050 100 98 76-130 <br /> Ethanol 171 100 200 86 31-143 <br /> Ethyl tert-butyl ether 101 050 100 101 81-121 <br /> Ethylberizene 117 050 100 117 84-132 <br /> Methyl tert-butyl ether 9 55 050 100 96 63-137 <br /> Toluene 116 050 100 116 78-129 <br /> Xylenes(total) 346 050 300 115 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 429 500 86 78-129 <br /> Laboratory Control Sample(4H 1 1003-BS2) Prepared&Analyzed 08/11/04 <br /> Gasoline Range Organics(C4-C12) 458 50 ug/l 440 104 70-124 <br /> Surrogate 1 2-Dichloroelhane-d4 436 115 no 87 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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 16 <br />