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• 1455 McDowell Blvd,Month Ste <br /> Sequoia Petaluma,CA 949544 <br /> + (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P304289 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 04/25/03 17 26 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> lAnalyle Result Lnnit Units Level Result %REC Limits RPD Lund Notes <br /> Batch 3040403-EPA 5030,waters <br /> Blank(3040403-BLKI) Prepared&Analyzed 04/17/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Trfluorotoluene 304 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 282 " 300 94 65-135 <br /> Laboratory Control Sample(3040403-SSI) Prepared&Analyzed 04/17/03 <br /> Gasoline Range Organics 2740 50 ug/1 2750 100 65-I35 <br /> �enzene 434 050 „ 400 108 65-135 <br /> Toluene 207 050 186 111 65-135 <br /> Ethylbenzene 485 050 470 103 65-135 <br /> Xylenes(total) 227 050 210 108 65-135 <br /> Methyl tert-butyl ether 667 25 620 108 65-135 <br /> Surrogate a a a-Trifluorotoluene 333 300 111 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Matrix Spike(3040403-MS1) Source P304224-01 Prepared&Analyzed 04/17/03 <br /> Gasolme Range Organics 2660 50 ug/I 2750 87 94 65-135 <br /> Benzene 41 3 050 400 ND 103 65-135 <br /> Toluene 204 050 186 ND 110 65-135 <br /> Ethylbenzene 479 0 50 470 ND 102 65-135 <br /> Xylenes(total) 220 050 210 ND 105 65-135 <br /> Methyl tent-butyl ether 643 2 5 62 0 040 103 65-135 <br /> Surrogate a a a-Triuorotoluene 326 300 109 65-135 <br /> Surrogate 4-Bromofluorobenzene 288 300 96 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br />