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404N WigetLme <br /> Sequoia Walnut Crcek,CA 94598 <br /> (925)988-9600 <br /> 400 Analytical FAX(925)988-9673 <br />-- —— - www sequotalabs can <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #laQ Project Number Arco#4932,Stockton Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 24-Jul-02 12 03 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Walnut Creek <br /> Reporting <br /> Analyte Result Linut Units Dilution Batch Prepared Analyzed Method Notes <br /> DMW-3,50'(W206289-09RE1)Sod Sampled 12-dun-02 09 40 Received 14-Jun-02 08 55 <br /> Methyl tert-butyl ether(MTBE) 10 50 mg/kg 2000 2F19001 19-Jun-02 21-Jun-02 EPA 8015/8021 <br /> Surrogate a,a a-Trrfluorotoluene 00100% 40-140 " A-01a <br /> DMW-3,55'(W206289-10)Sod Sampled 12-Jun-02 09 50 Received 14-dun-02 08 55 <br /> Purgeable Hydrocarbons(C6-C12) ND 10 mg/kg 20 2F19001 19-Jun-02 20-Jun-02 EPA 8015/9021 <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Methyl tert-butyl ether(MTBE) 047 0 050 " <br /> Surrogate a a a-Trifluorotoluene 74 7% 40-140 " <br /> DMW-3 60'(W206289-11)Sod Sampled 12,dun-02 10 00_ Received_14-Jun-02 08 55 <br /> Purgeable Hydrocarbons(C6-C12) ND 10 mglkg 20 2F19001 19-run-02 20-Jun-02 EPA 8015/8021 <br /> Benzene ND 00050 " <br /> meoluene ND 00050 <br /> thylbenzene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Methyl tert-butyl ether(MTBE) ND 0 050 " <br /> Surrogate a,a,a-Trifluorotoluene 880% 40-140 " <br /> DMW-3,70'(W206289-12)Sod Sampled 12-Jun-0210 10 Received 14-Jun-02 08 55 <br /> Purgeable Hydrocarbons(C6-C12) ND l 0 mg/kg 20 2F19001 19-Jun-02 20-Jun-02 EPA 8015/8021 <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-Tnfluorotoluene 807% 40-140 " <br /> equola Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 6 of 38 <br />