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Sequoia 885 JI Drive <br /> Hill CA 9 <br /> (408)777 9600 <br /> 6 9600 <br /> Z�► Analytical FAX(408)782 6308 <br /> www sequoialabs com <br /> URS Corporation[Arcola Project ARCO#5469, Stockton,CA NNI0470 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 09/29/04 17 33 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4I23011 -EPA 5030B P/T <br /> Laboratory Control Sample(4I23011-BS2) Prepared&Analyzed 09/23/04 <br /> Benzene 524 0 50 ug/l 640 82 69-124 <br /> Ethylbenzene 771 050 752 103 84-132 <br /> Methyl tert-butyl ether 867 0 50 992 87 63-137 <br /> Toluene 31 9 050 319 100 78-129 <br /> Xylenes(total) 377 0 50 366 103 83-137 <br /> Gasoline Range Organics(C4-C12) 483 50 440 110 70-124 <br /> Surrogate 12-Dichloroelhane-d4 458 5 00 92 78-129 <br /> Laboratory Control Sample Dup(4123011-BSD1) Prepared&Analyzed 09/23/04 <br /> tert-Amyl methyl ether 844 0 50 ug/l 100 84 82-140 11 20 <br /> Benzene 9 03 0 50 100 90 69-124 2 20 <br /> tert-Butyl alcohol 475 20 500 95 56-131 4 20 <br /> 0propyl ether 9 11 0 50 1f 100 91 76-130 8 20 <br /> bromoethane(EDB) 834 050 100 83 77-132 17 20 <br /> 1,2-Dichloroethane 8 10 0 50 10 0 81 77-136 21 20 HM <br /> Ethanol 211 100 200 106 31-143 3 20 <br /> Ethyl tert-butyl ether 860 0 50 10 0 86 81-121 9 20 <br /> Ethylbenzene 968 050 100 97 84-132 4 20 <br /> Methyl tert-butyl ether 799 050 10 0 80 63-137 17 20 <br /> Toluene 945 050 100 94 78-129 1 20 <br /> Xylenes(total) 289 0 50 300 96 83-137 4 20 <br /> Surrogate 12-Dichloroethane-d4 364 500 73 78-129 LG <br /> Matrix Spike(4123011-MS1) Source MNI0470-03 Prepared 09/23/04 Analyzed 09/24/04 <br /> Benzene 48 8 5 0 ug/I 64 0 ND 76 69-124 <br /> Ethylbenzene 718 5 0 75 2 ND 95 84-132 <br /> Methyl tert-butyl ether 400 5 0 992 360 40 63-137 LN <br /> Toluene 291 5 0 319 ND 91 78-129 <br /> Xylenes(total) 358 5 0 366 ND 98 83-137 <br /> Gasoline Range Organics(C4-C 12) 4540 500 4400 450 93 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 416 5 00 83 78-129 <br /> oia 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 werghl basis <br /> Thrs analytical report must be reproduced in its entirety <br /> Page 13 of 17 <br />