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1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> IW A n aly�;i,,Ca 1 FAX(408)782-6308 <br /> www sequoralabs cam <br /> URS Corporation[ArcoI I Project ARCO#2130,Stockton,CA MOF0835 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/07/05 I2 24 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Quality Control � <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source @/REC RPD <br /> Analyte Result Limit Units Level Result '/REC Limits RPD Limit Notes <br /> Batch 5F30006-EPA 5030B P/T/EPA 8260B <br /> Blank(5F30006-BLKI) Prepared&Analyzed 06/30/05 <br /> Methyl ten-butyl ether ND 050 ugR <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4 C 12) ND 50 " <br /> Surrogate 12-Drchlaroethane-d4 557 500 Ill 60-135 <br /> Blank(5F30006-BLK2) Prepared&Analyzed 06/30/05 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> ten-Butyl alcohol ND 50 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 <br /> thyl tert-butyl ether ND 050 <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-Cl2) ND 50 " <br /> Surrogate 1,2-Dtchloroelhane d4 534 500 107 60-135 <br /> Laboratory Control Sample(5F30006-BSI) Prepared&Analyzed 06/30/05 <br /> ten Amyl methyl ether 122 050 ug/l 100 122 80-115 HL <br /> Benzene 108 050 100 108 65-115 <br /> ten-Butyl alcohol 481 5 0 500 96 75-150 <br /> Di-isopropyl ether 12 0 050 100 120 75-125 <br /> 1,2-Dichlotoethane 118 050 100 118 85-130 <br /> Ethanol 209 100 200 104 70-135 <br /> Ethyl ten-butyl ether 106 0 50 100 106 75-130 <br /> Ethylbenzene 923 050 " 100 92 75-135 <br /> Methyl ten-butyl ether 10 a 050 100 108 65-125 <br /> Toluene 106 050 100 106 85-120 <br /> Xylenes(total) 290 050 300 93 85-125 <br /> Surrogate 11-Dichloroelhane d4 554 500 111 60-135 <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 /> 10 This analytical report must be reproduced in its entirely <br /> Page 18 of 21 <br />