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885 Jm-t Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)77 .4600 <br /> Analytical V11W equoi7826308 <br /> www sequoialabs corn <br /> URS Corporation[Arco II Project ARCO#6020,Manteca,CA MNH0330 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/04 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result IAmit Units Level Result °/.REC Limits RPD Limit Notes <br /> Batch 4H19001 -EPA 5030E P/T <br /> Laboratory Control Sample(41119001-BSI) Prepared&Analyzed 08/19/04 <br /> Toluene 982 050 ug/I 100 98 78-129 <br /> Xylenes(total) 307 050 300 102 83-137 <br /> Surrogate 1 2-Drchloroethane-d4 225 250 90 78-129 <br /> Laboratory Control Sample(4H19001-BS2) Prepared&Analyzed 08/19/04 <br /> Gasoline Range Organics(C4-C12) 400 50 ug/1 440 91 70-124 <br /> Surrogate 12-Dichloroethane-d4 119 150 88 78-129 <br /> Laboratory Control Sample Dup(4H19001-BSD 1) Prepared&Analyzed 08/19/04 <br /> tent-Amyl methyl ether 103 050 ug/I 100 103 82-140 0 20 <br /> Benzene 969 050 10 0 97 69-124 0 20 <br /> tert-Butyl alcohol 45 1 20 50 0 90 56-131 5 20 <br /> Di-isopropyl ether 102 050 100 102 76-130 1 20 <br /> 012-Dibromocthane(EDB) 9 84 050 10 0 98 77-132 2 20 <br /> ,2-Dichloroethane 9 75 0 50 ]GO 98 77-136 0 3 20 <br /> Ethanol 152 100 200 76 31-143 6 20 <br /> Ethyl tert-butyl ether 104 050 JOG 104 81-121 0 20 <br /> Ethylbenzene 100 050 JOG 100 84-132 0 1 20 <br /> Methyl tert-butyl ether 958 050 ]0 0 96 63-137 2 20 <br /> Toluene 9 47 050 100 95 78-129 4 20 <br /> Xylenes(total) 303 050 300 101 83-137 1 20 <br /> Surrogate 1 2-Dichloroethane-d4 220 250 88 78-129 <br /> Matrix Spike(4H19001-MSI) Source MNH0250-02 Prepared&Analyzed 08/19/04 <br /> Benzene 3400 50 ugll 640 2700 109 69-124 <br /> Ethylbenzene 975 50 696 180 114 84-132 <br /> Methyl ten-butyl ether 965 50 992 61 91 63-137 <br /> Toluene 3240 50 2970 39 108 78-129 <br /> Xylenes(total) 4370 50 3370 560 113 83-137 <br /> Gasoline Range Organics(C4-C 12) 45200 5000 44000 10000 80 70-124 <br /> Surrogate 12-Drchloroethane-d4 214 150 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 16 of 18 <br />