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885 Tarns Dr <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical FAX(408)s26 08 <br /> www sequoralabs coir <br /> URS Corooration 111 Project ARCO 42093,Tracy,CA MMD0164 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number lntnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 04/16/03 08 39 <br /> 'otal Purgeable Hydrocarbons(C6-C10) and Volatile Organic Compounds by EPA method 8260B-Quality Contr4 <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Souree %REC RPA <br /> Analyte Result Limit Units level Result %R1;C Limits RPD Limit Notes <br /> Batch 3DO9041-EPA 5030B PIT <br /> Matrix Spike Du 3D09041-MSD/ Source MMD0164-02 Prepared&Analyzed 04/09/03 <br /> Batch 3D10007-EPA 5030B P/T <br /> Blank(3D10007-BLKI) Prepared&Analyzed 04/10/03 _ <br /> Benzene ND 050 ug/1 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 4 69 5 00 938 78-129 <br /> Laboratory Control Sample 3D10007-BS1 Prepared&Analyzed 04/10/03 <br /> 0enzene 10 6 0 50 ug/I 100 106 78-124 <br /> oluene 105 0 50 100 105 78-129 <br /> Surrogate 1,2-Drchloroethane-d4 465 500 930 78-129 <br /> Laboratory Control Sample 3D10007-BS2 Prep=d&Analyzed 04/10/03 <br /> Benzene 560 050 up/l 5 44 103 78-124 <br /> Toluene 33 4 050 " 328 102 78-129 <br /> Gasoline Range Organics(C6-CIO) 319 50 440 725 70-113 <br /> Surrogate 1,2-Dichloroethane-d4 4 75 500 95 0 78-129 <br /> Matra Spike(3DI0007-MSI) _ Source MMD0093-03 Prepared&Analyzed 04/10/03 <br /> Benzene 28 4 - 25 ugfl 272 ND 104 78-124 <br /> Toluene 154 25 164 ND 939 78-129 <br /> Gasoline Range Organics(C6-C10) 1800 250 2200 180 736 70-113 <br /> Surrogate 1 2-Drchloroethane-d4 453 500 906 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 /> 11 of 15 <br />