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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> 4D (925)988-96004W <br /> Analytical FAX(925)988-9673 <br /> www oialabs c <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 /> Diesel Hydrocarbons (CIO-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 Limtt Notes <br /> Batch 2F24013-EPA 3510B <br /> Blank(2F24013-BLK1) Prepared 24-Jun-02 Analyzed 25-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) ND 5 0 mg/kg <br /> Surrogate n-Octacosane 347 333 104 50-150 <br /> LCS(2F24013-BSI) Prepared 24-Jun-02 Analyzed 25-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 142 50 mg/kg 150 947 60-140 <br /> Surrogate n-Octacosane 341 333 102 50-150 <br /> LCS Dup(2F24013-BSDI) Prepared 24-Jun-02 Analyzed 25-Jim-02 <br /> Diesel Range Hydrocarbons(C10-C28) 153 50 mg/kg 150 102 60-140 746 40 <br /> Surrogate n-Octacosane 343 333 103 50-150 <br /> Matrix Spike(2F24013-MSI) Source W206289-10 Prepared 24-Jun-02 Analyzed 25-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 138 50 mg/kg 150 ND 920 50-150 <br /> Surrogate n-Octacasane 351 333 105 50-150 <br /> Matrix Spike Dup(2F24013-MSD1) Source W206289-10 Prepared 24-Jun-02 Analyzed 25-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) 789 50 mg/kg 150 ND 526 50-150 545 50 QR-07 <br /> Surrogate n-Octacosane 348 333 105 50-150 <br /> Batch 2F25005-EPA 3510E <br /> Blank(2F'25005-BLKI) Prepared 25-Jun-02 Analyzed 27-Jun-02 <br /> Diesel Range Hydrocarbons(C 10-C28) ND 50 mg/kg <br /> Surrogate n-Ociacosane 381 333 114 50-150 <br /> Blank(2F25005-BLK2) Prepared 27-Jun-02 Analyzed 28-Jun-02 <br /> Diesel Range Hydrocarbons(C10-C28) ND 5 0 mg/kg <br /> Surrogate n-Octacosane 364 333 109 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of Aft <br /> custody document This analytical report must be reproduced in its entirety wr <br /> Page 33 of 38 <br />