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4 <br /> 885 Jarvis Dr <br /> 4DSequoia MaganHill,CA95037 <br /> Analytical (408)77(,-9600 <br /> c FAX(408)782-6308 <br /> www sequoialabs cam <br /> URS Corporation[]) Project BP Heritage Site 411191,Stockton,CA MMB0058 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number BP Heritage Site#11191,Stockton,CA Reported- <br /> Sacramento CA,95833 Project Manager Vern Elarth 03/07/03 07 50 <br /> al Purgeable Hydrocarbons (C6-C10) and Volatile Organic Compounds by EPA method 8260E- Quality Con <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 3B16004-EPA 5030B PIT <br /> Laboratory Control Sample(31316004-13SI) Prepared&Analyzed 02/16/03 <br /> Methyl tcrt-butyl ether 116 050 ug11 100 116 63-137 <br /> Benzene 104 050 100 104 78-124 <br /> Toluene 107 050 100 107 78-129 <br /> Surrogate 12-Dichloroethane-d4 519 500 104 78-129 <br /> Laboratory Control Sample(3816004-BS2) Prepared&Analyzed 02/16/03 <br /> Methyl tert-butyl ether 8 34 050 119/1 904 923 63-137 <br /> Benzene 534 050 544 982 78-124 <br /> Toluene 329 050 328 100 78-129 <br /> Gasoline Range Organics(C6-CIO) 401 50 440 91 1 70-113 <br /> • Surrogate 12-Dichloroethane-d4 476 500 952 78-129 <br /> Matrix Spike(31316004-MSI) Source-MMB0298-02 Prepared&Analyzed 02/16/03 <br /> Methyl tent-butyl ether 3110 50 ug/l 904 2100 112 0-200 <br /> Benzene 488 50 544 ND 897 78-124 <br /> Toluene 3080 50 3280 ND 939 78-129 <br /> Gasoline Range Organics(C6-C 10) 39800 5000 44000 ND 84 5 70-113 <br /> Surrogate 1 2-Dtchloroethane-d4 5 16 Soo 103 78-129 <br /> Matrix Spike Dnp(3BI6004-MSD1) Source MM80298-02 Prepared&Analyzed 02/16/03 <br /> Methyl tent-butyl ether 3030 50 ug/l 904 2100 103 0-200 261 200 <br /> Benzene 506 50 544 ND 930 78-124 3 62 12 <br /> Toluene 3220 50 3280 ND 982 78-129 444 10 <br /> Gasoline Range Organics(C6-C 10) 41300 5000 44000 ND 880 70-113 370 9 <br /> Surrogate 12-Dichloroethane-d4 497 500 994 78-129 <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 /> This analytical report must be reproduced in its entirety <br /> 9of10 <br />