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Jarvis Drive <br /> Sequoia Morgann Hill CA 95037 <br /> 4D— <br /> Analytical (408)776-9600 <br /> FAX(406)782 6308 <br /> www sequoialabs corn <br /> is <br /> URS Corporation(ArcoI l Project ARCO#6100,Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GDC I Y-0003 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/22/05 16 37 <br /> Volatile Organic Compounds by EPA Method 8260B - 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 5GO7035- EPA 50308 PIT/EPA 82608 <br /> Matrix Spike pup(5607035-MSDI) Source MOF0941-04 Prepared 07/07/05 Analyzed 07/08/05 <br /> Benzene 277 25 ug/I 304 ND 91 65-115 4 20 <br /> Ethylbenzene 432 25 392 ND 110 75-135 3 15 <br /> Methyl tert-butyl ether 1630 25 480 850 162 65-125 3 20 LM <br /> Toluene 1720 25 1640 ND 105 85-120 4 20 <br /> Xylenes(total) 2150 25 1920 ND 112 85-125 2 20 <br /> Gasoline Range Organics(C4-C12) 21100 2500 22000 740 93 70-124 4 20 <br /> Surrogate 12-Dichloroethane-d4 2 26 250 90 60-135 <br /> Batch 5G12011 -EPA 5030B P/T/EPA 8260B <br /> Blank(5G 1201 1-BLK1) Prepared&Analyzed 07/12/05 <br /> tert-Amyl methyl ether ND 050 ugll <br /> � <br /> enzene ND 050 ;1 <br /> rt-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 050 " <br /> 12-Dibromoethane(EDB) ND 050 " <br /> 12-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 12-Dichloroethane d4 227 2 50 91 60-135 <br /> Blank(5G 12011-BLK2) Prepared&Analyzed 07/12/05 <br /> tert-Amyl methyl ether ND 0 50 ug/I <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> DL-isopropyl ether ND 050 " <br /> 1 2-Dtbromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 0 50 <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert butyl ether ND 050 " <br /> Sequoia Analytical-Morgan HIII The results in this report apply to the samples anal] ed in accordance with the chain of <br /> . custody document Unless otherwise stated results are reported on a wet weight haws <br /> This analytical report must he reproduced in its entirety <br /> Page 13 of 17 <br />