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404 N Wiget Cane <br /> Sequoia Walnut Croak,CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> www segaoialks <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#4932,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 24-Jul-02 12 03 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE by DHS LUFT-Quality Control <br /> Sequoia Analytical-Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2F19001-EPA 5030H McOH <br /> Blank(2F19001-BLK1) Prepared I9-Jun-02 Analyzed 20-Jun-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 <br /> Methyl tert-butyl ether(MTBE) ND 0 050 " <br /> Surrogate a a a-Tri luorotoluene 0 664 0 600 111 40-140 <br /> LCS(2F19001-BSI) Prepared 19-Jun-02 Analyzed 20-Jun-02 <br /> Benzene 0 692 00050 mg/kg 0 800 865 50-150 <br /> Toluene 0 688 00050 0 800 860 50-150 <br /> Ethylbenzene 0 696 00050 0 800 87 0 50-150 <br /> Xylenes(total) 2 15 00050 240 89 6 50-150 <br /> Surrogate a a a-Tris luorotoluene 0 668 0 600 111 40-140 <br /> Matrix Spike(2F19001-MS1) Source W206289-01 Prepared 19-Jun-02 Analyzed 20-Jun-02 <br /> Benzene 0 670 00050 mg/kg 0 800 ND 83 8 50-150 <br /> Toluene 0 670 00050 0 800 ND 83 8 50-150 <br /> Ethylbenzene 0 672 00050 0 800 ND 840 50-150 <br /> Xylenes(total) 206 00050 240 ND 85 8 50-150 <br /> Surrogate a a a-Tris luorotoluene 0 566 " 0 600 94 3 40-140 <br /> Matra Spike Dug(2F19001-MSDl) Source W206289-01 Prepared 19-Jun-02 Analyzed 20-Jun-02 <br /> Benzene 0 670 00050 mg/kg 0 800 ND 83 8 50-150 000 20 <br /> Toluene 0 672 00050 0 800 ND 840 50-150 0 298 20 <br /> Ethylbenzene 0 676 00050 0 800 ND 84 5 50-I50 0 593 20 <br /> Xylenes(total) 207 00050 240 ND 86 2 50-150 0 484 20 <br /> Suirrogate aa a-Til luorotoluene 0 534 0 600 890 40-140 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to thesamples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 31 of 38 <br />