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CALIFORNIA TSERVICES <br /> Page 25 of 28 07/27/06 10:19 <br /> ENGEO-Tracy Project: North Lathrop Properties <br /> 2880 N.Tracy Blvd Ste#3 Project Number: 5044.5.001.01 CLS Work Order#:CPG0655 <br /> Tracy,CA 95376 Project Manager: Zac Crawford COC#:69131 <br /> Metals (Dissolved) by EPA 200 Series Methods - Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch CP05548- EPA 3020A <br /> LCS(CP05548-ESI) Prepared:07/25/06 Analyzed:07/26/06 <br /> Arsenic 51.9 2.0 µg/L 50.0 104 80-120 20 <br /> Lead 23.9 5.0 25.0 95.6 80-120 20 <br /> Thallium 27.1 5.0 25.0 108 80-120 20 <br /> LCS Dup(CP05548-BSD1) Prepared:07/25/06 Analyzed:07/26/06 <br /> Arsenic 53.9 2.0 µg/L 50.0 108 80-120 3.78 20 <br /> Lead 27.2 5.0 25.0 109 80-120 12.9 20 <br /> Thallium 28.4 5.0 25.0 114 80-120 4.68 20 <br /> Matrix Spike(CP05548-PvIS1) Source:CPG0655-02 Prepared:07/25/06 Analyzed:07/26/06 <br /> Arsenic 56.6 2.0 µg/L 50.0 9.9 93.4 75-125 25 <br /> Lead 23.5 5.0 25.0 ND 94.0 75-125 25 <br /> Thallsum 22.8 5.0 25.0 3.0 79.2 75-125 25 <br /> Matrix Spike Dup(CP05548-MSDI) Source:CPG0655-02 Prepared:07/25/06 Analyzed:07/26/06 <br /> Arsenic 56.8 2.0 µg/L 50.0 9.9 93.8 75-125 0.353 25 <br /> Lead 23.4 5.0 25.0 ND 93.6 75-125 0.426 25 <br /> Thallium 24.7 5.0 25.0 3.0 86.8 75-125 8.00 25 <br /> CA DOHS FLAP Accreditation/Registration Number 1233 <br /> 3249 Fitzgerald Road Rancho Cordova, CA 95742 wWW.californialab.com 916-638-7301 Fax: 916-638-4510 <br />