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S 5 Ave Ste 8 a— Sequoia) (916)921 Sacramento CA 95834 Analytical FAX 0100 (916)921 0100 www sequoialabs cam SECOR International-Rancho Cordova Project Tosco 5447,Stockton,CA 5307373 3017 Kilgore Road,Suite 100 Project Number N/A Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/04/03 16 14 Diesel Hydrocarbons by DHS LUFT-Quality Control Sequoia Analytical-Sacramento Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 3070230-EPA 3550B Blank(3070230-BLKI) Prepared&Analyzed 07/17/03 Diesel Range Organics(C 10-C28) ND 20 mg/kg .- Surrogate Octacosane 0 582 " 0 667 87 50-150 Blank(3070230-BLK2) Prepared 07/22/03 Analyzed 07/23/03 Diesel Range Organics(C10-C28) ND 20 mg/kg Surrogate Oclacosane 0 586 0 667 88 50-150 Laboratory Control Sample(3070230-BSI) Prepared&Analyzed 07/17/03 Diesel Range Organics(C 10-C28) 18 8 20 mg/kg 167 113 60-140 Surrogate Octacosane 0 654 0 667 98 50-150 Laboratory Control Sample(3070230-BS2) Prepared 07/22/03 Analyzed 07/23/03 ,dMkDiesel Range Organics(C 10-C28) 20 1 20 mg/kg 16 7 120 60-140 Surrogate Octacosane 0 643 0 667 96 50-150 Matnx Spike 3070230-MS1Source 5307305-03 Prepared&Analyzed 07/17/03 Diesel Range Organics(C 10-C28) 210 2 0 mg/kg 16 7 5 6 92 50-150 Surrogate Octacosane 0 649 0 667 97 50-150 Matrix Spike Dup(3070230-MSD I) Source 5307305-03 _ Prepared&Analyzed 07/17/03 Diesel Range Organics(C10-C28) l7 6 2 0 mg/kg 16 7 5 6 72 50-150 18 50 Surrogate Octacosane 0 638 0 667 96 50-150 Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 8 of 10