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404N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> Analytical (925)988-9600 <br /> FAX(925)988-9673 <br /> www sr oialabs can <br /> Secor-Rancho Cordova Protect BP <br /> 3017 Kilgore Rd,Ste #100 Project Number BP#595,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 15-Jul-02 12 49 <br /> Volatile Organic Compounds by EPA Method 8260B- 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 2GO8015-EPA 5030B McOH <br /> LCS(2G08015-BS2) Prepared 02-Jul-02 Analyzed 10-Jul-02 <br /> Methyl tert-butyl ether(MTBE) 274 040 mg/kg 250 110 70-130 <br /> Surrogate Dibromofluoromethane 359 250 144 50-150 <br /> Surrogate 12-Dichloroethane-d4 325 250 130 50-150 <br /> Matrix Spike(2G08015-MSI) Source W206478-01 Prepared OI-Jul-02 Analyzed 08-Jul-02 <br /> Methyl tent-butyl ether(MTBE) 226 020 mg/kg 250 ND 904 60-140 <br /> Surrogate Dibromofluoromethane 242 250 968 50-150 <br /> Surrogate 12-Dichloroethane-d4 222 250 888 50-150 <br /> Matrix Spike Dup(2GO8015-MSD1) Source W206478-01 Prepared 01-Jul-02 Analyzed 08-Jul-02 <br /> Methyl tent-butyl ether(MTBE) 227 020 mg/kg 250 ND 908 60-140 0 442 25 <br /> Surrogate Dibromofluoromethane 249 250 996 50-150 <br /> Surrogate 12-Dichloroethane-d4 237 250 948 50-150 <br /> Sequoia 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 21 of 22 <br />