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85 Jarvis Dr <br /> a— —N Sequoia 8 <br /> Morgan Hill, 95037 <br /> WO (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> URS Corporation Project BP Heritage Site#11193,Stockton,CA ML10264 <br /> 500 12th Street,Suite 100 Project Number BP Heritage Site#11193,Stockton,CA Reported <br /> Oakland CA,94607 Project Manager Vern Elarth 09/18/02 12 37 <br /> BTEX by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Anal to Result Limit Units Level Result %REC Limits RPD L=t Notes <br /> Batch 2113029-EPA 5030B P/T <br /> Blank(2I13029-BLK1) Prepared&Analyzed 09/13/02 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Total Xylenes ND 050 " <br /> Surrogate 1 2-Drchloroethane-d4 552 500 110 78-129 <br /> Laboratory Control Sample 2113029-BS1 Prepared&Analyzed 09/13/02 <br /> Benzene 229 050 ug/l 200 114 78-124 <br /> Toluene 235 050 200 118 78-129 <br /> Surrogate 12-Drchloroethane-d4 4 73 500 94 6 78-129 <br /> Oaboratory Control Sample Du 2113029-BSDI Prepared&Analyzed 09/13/02 <br /> Benzene 23 1 050 ug/1 200 116 78-124 0 870 12 <br /> Toluene 23 7 050 20 0 118 78-129 0 847 10 <br /> Surrogate 12-Drchloroethane-d4 467 5 00 93 4 78-129 <br /> Matrix Spike(2{13029-MSl) Source MLI0291-01 Prepared 09/13/02 Analyzed 09/14/02 <br /> Benzene 27 0 050 ugn 200 ND 135 78-124 QM-07 <br /> Toluene 27 5 050 200 ND 138 78-129 QM-07 <br /> Surrogate 12-Dichloroethane-d4 4 66 5 00 93 1 78-129 <br /> Matrix Spike Du (2113029-MSD1) Source ML10291-01 Prepared 09/13/02 Analyzed 09/14/02 <br /> Benzene 243 050 u8A 200 ND 122 78-124 10 5 12 <br /> Toluene 24 7 0 50 200 ND 124 78-129 107 10 QR-07 <br /> Surrogate 12-Dichloroethane-d4 4 65 500 93 0 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 /> 32 of 39 <br />