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885 Jarvis Drive <br /> �egSequoiaMorgan l-L0 CA 95037037 <br /> (408)776 9600 <br /> FAX(408)782 6308 <br /> Analytical <br /> www sequoialabs corn <br /> URS Corporation(Arcola 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 RPI] <br /> Analyte Result Limit Units level Result %REC Limas RPD Lima Notes <br /> Batch 4H18028-EPA 5030B PIT <br /> Matrix Spike Dup(41118028-MSD1) Source MNH0160-03 Prepared 08/18/04 Analyzed 08/19/04 <br /> Benzene 2800 250 ug/l 3200 200 81 69-124 4 20 <br /> Ethyibenzene 6440 250 3480 2500 113 84-132 2 20 <br /> Methyl ten-butyl ether 4180 250 4960 ND 84 63-137 3 20 <br /> Toluene 22600 250 14800 7500 102 78-129 3 20 <br /> Xylenes(total) 32800 250 16800 14000 112 83-137 2 20 <br /> Gasoline Range Organics(C4-C 12) 256000 25000 220000 58000 90 70-124 4 20 <br /> Surrogate 12-Dichloroeihane-d4 226 150 90 78-129 <br /> Batch 4H 19001 -EPA 5030B PIT <br /> Blank(4HI9001-BLK1) Prepared&Analyzed 08/19/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> rt-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2 Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 " <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 12-Dichloroethane-d4 2 09 250 84 78-119 <br /> Laboratory Control Sample{41119001-13SI) Prepared&Analyzed 08/19/04 <br /> tert-Amyl methyl ether 10 3 050 ug/l ]0 0 103 82-140 <br /> Benzene 969 050 100 97 69-124 <br /> tert-Butyl alcohol 430 20 500 86 56-131 <br /> Di-isopropyl ether 101 050 100 t0] 76-130 <br /> 1,2-Dibromoethane(EDB) 966 050 too 97 77-132 <br /> 1,2-Dichloroethane 972 0 50 100 97 77-136 <br /> Ethanol 143 t00 200 72 31-143 <br /> Ethyl tert-butyl ether 104 050 10 0 104 81-121 <br /> Ethylbenzene 999 050 100 100 84-132 <br /> Methyl tort-butyl ether 9 76 050 too 98 63-137 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed in accordance wrth the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> Thrs analytical report must be reproduced in its entirety <br /> Page 15 of 18 <br />