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Drive <br /> T"Y� 8lams <br /> Sequoia Hi <br /> Morgan Hill CA 950375037 <br /> (408)776 9600 <br /> Analytical <br /> FAX(408)7826308 <br /> www sequmalabs com <br /> URS Corporation rArcoll Project ARCO#5469,Stockton,CA M000479 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 04/07/05 12 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hili <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5C28010-EPA 5030B P/T/EPA 8260B <br /> Matrix Spike(5C28010-MSI) Source M000479-04 Prepared&Analyzed 03/28/05 <br /> Benzene 736 50 ug/l 640 160 90 65-115 <br /> Ethylbenzene 809 50 752 ND 108 75-135 <br /> Methyl tert-butyl ether 4860 50 992 3700 117 65-125 <br /> Toluene 3180 50 3190 3 6 100 85-120 <br /> Xylenes(total) 4300 50 3660 ND 117 85-125 <br /> Gasoline Range Organics(C4-C12) 45500 5000 44000 3900 95 70-124 <br /> Surrogate 1 2-Dtchloroethane-d4 445 500 89 60-135 <br /> Matrix Spike Dap(5C28010-MSD1) Source M000479-04 Prepared&Analyzed 03/28/05 <br /> Benzene 714 50 ug/l 640 160 87 65-115 3 20 <br /> Ethylbenzene 775 50 752 ND 103 75-135 4 15 <br /> a1 tert-butyl ether 5310 50 992 3700 162 65-125 9 20 BB,LM <br /> ene 3240 50 3190 3 6 101 85-120 2 20 <br /> Xylenes(total) 3950 50 3660 ND 108 85-125 8 20 <br /> Gasoline Range Organics(C4-C12) 45700 5000 44000 3900 95 70-124 0 4 20 <br /> Surrogate 1 2-Dichloroethane-d4 5 32 500 106 60-135 <br /> Batch 5C29006-EPA 5030B P/T/EPA 8260E <br /> Blank(5C29006-BLK1) Prepared&Analyzed 03/29/05 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 <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 0 50 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 1 2-Dtchloroethane-d4 4 76 .500 95 60-135 <br /> uota Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> cu3tody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 21 of 30 <br />