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404N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> -_ --Analytical ---- -- -------- --- — FAX(925)9889673 <br /> www se oialabs can-- <br /> Secor-Rancho Cordova Protect 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 /> Diesel Hydrocarbons(C10-C23) 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 2F25005-EPA 3510B <br /> LCS(2F25005-BS1) Prepared 25-Jun-02 Analyzed 27-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 129 50 mg/kg 150 860 60-140 <br /> Surrogate n-Ociacosane 350 333 105 50-150 <br /> LCS(2F25005-BS2) Prepared 27-Jun-02 Analyzed 28-Jun-02 <br /> Diesel Range Hydrocarbons(C I O-C28) 144 50 mg/kg 150 960 60-140 <br /> Surrogate n-Octacosane 368 " 333 111 50-150 <br /> LCS Dup(2F25005-BSDI) Prepared 25-Jun-02 Analyzed 27-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 122 50 mg/kg 150 813 60-140 558 40 _ <br /> Surrogate n-Oclacosane 359 11 333 108 50-150 <br /> Matnx Spike(2F25005-MSI) Source-W206289-22 Prepared 25-Jun-02 Analyzed 27-Jun-02 <br /> Diesel Range Hydrocarbons(C 10-C28) 120 so mg/kg 150 ND 900 50-150 <br /> wurrogate n-Octacosane 344 " 333 103 50-150 <br /> Matrix Spike Dup(2F25005-MSDI) Source W206289-22 Prepared 25-Jun-02 Analyzed 27-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 143 50 mg/kg 150 ND 953 50-150 175 50 <br /> Surrogate n-Octacosane 344 333 103 50-150 <br /> equoia 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 entirely <br /> Page 34 of 38 <br />