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885 Jarvis Dr <br /> 4DV <br /> Sequoia Morgan Ilial,CA 95037 <br /> ► (409)776-9600 <br /> Analytical FAX(408)792-6308 <br /> www segaoialabs Corr <br /> URS Corporation f 11 Project ARCO#12093,Tracy,CA MMD0164 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number Intim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vem Elarth 04/16/03 08 39 <br /> btal Purgeable Hydrocarbons (C6-C10) and Volatile Organic Compounds by EPA method 8260B-Quality Contr4 <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %P-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3DO9041-EPA 5030B P/T <br /> Blank(3D09041-BLKl) Pre ared&Analyzed 04/09/03 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate 1 2-Dichloroethane-d4 468 500 936 78-129 <br /> Laboratory Control Sample 3D09041-13M1 Prepared&Analyzed 04/09/03 <br /> Benzene 110 050 ug/l 100 110 78-124 <br /> Toluene 10 4 050 10 0 104 78-129 <br /> arrogate 12-Dichloroethane-d4 4 92 5 00 <br /> 984 78-129 <br /> Laboratory Control Sample 3D09041-BS2 Prepared&Analyzed 04/09/03 <br /> Benzene 593 050 ug/l 544 109 78-124 <br /> Toluene 33 2 050 32 B 101 78-129 <br /> Gasoline Range Organics(C6-C10) 341 50 440 77 5 70-113 <br /> Surrogate 1,2-Dichloroethane-d4 4 84 500 968 78-129 <br /> Matrix Spike(3D09041-MS1) Source MMD0164-02 Prepared&Analyzed 04/09/03 <br /> Benzene 28 2 2 5 ugA 272 ND 104 78-124 <br /> 'toluene 160 25 164 ND 976 78-129 <br /> Gasoline Range Organics(C6-C10) 1750 250 2200 ND 795 70-1I3 <br /> Surrogate 12-Dichloroethane-d4 485 500 970 78-129 <br /> Matrix Spike Du 3D09041-MSDI Source MMD0164-02 Pre ared&Analyzed 04/09/03 <br /> Benzene 28 1 2 5 ug/1 27 2 ND 103 78-124 0 355 12 <br /> Toluene 165 2 5 164 ND 101 78-129 308 10 <br /> Gasoline Range Organics(C6-C10) 1730 250 2200 ND 78 6 70-113 1 15 9 <br /> Surrogate 12-Drchloroethane-d4 4 92 500 <br /> 98 4 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 /> 10 of 15 <br />