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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> �► (408)776-9300 <br /> Analytical <br /> FAX(40$)782-6348 <br /> URS Corporation Project BP Hentage Site#1 1193,Stockton,CA ML10264 <br /> 500 12th Street,Suite 100 Project Number BP Hentage Site#11193,Stockton,CA Reported <br /> Oakland CA,94607 Project Manager Vern Elarth 09/18/02 12 37 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan 11111 <br /> Reporting Spike Source %REC RPD <br /> Anal to Result Limit Units Level Result %REC Lirmts RPD Limit Notes <br /> Batch 2112013-EPA 5030B P/T <br /> Blank(2112013-BLK1) Prepared&Analyzed 09/12/02 <br /> Ethanol ND 40 ugA <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 12-Dichloroethane-d4 5 88 500 118 78-129 <br /> Laboraton Control Sample 2112013-BS1 Prepared&Analyzed 09/12/02 <br /> 0—ethyl tert-butyl ether 104 050 ug/1 100 104 63-137 <br /> Surrogate 12-Dichloroethane-d4 567 5 00 113 78-129 <br /> Laboratory Control Sam le Du (2I12013-BSD1) Prepared&Analyzed 09/12/02 <br /> Methyl tert-butyl ether 10 6 0 50 ug/1 10 0 106 63-137 1 90 13 <br /> Surrogate 1 2-Dichloroethane d4 5 78 5 00 116 78-129 <br /> Batch 2I13010-EPA 5030B P/T <br /> Blank 2113010-BLK1 Prepared&Analyzed 09/13/02 <br /> Ethanol ND 40 UFA <br /> tert-Butyl alcohol ND 20 ^ <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 0 50 <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethylene dibromide ND 0 50 " <br /> Surrogate 12-Dichloroethane-d4 5 78 500 116 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> 33 of 39 <br />