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CALIFORNIA TY SERVICES <br /> Page 20 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 /> Conventional Chemistry Parameters by PA Methods - Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch CP05465-General Preparation <br /> Matrix Spike(CP05465-MS2) Source:CPG0694-03 Prepared&Analyzed:07/21/06 <br /> Methylene Blue Active Substances 0.5070.10 mg/L 0.500 ND 101 75-125 25 <br /> Matrix Spike Dup(CP05465-MSDI) Source:CPG0641-01 Prepared&Analyzed:07/21/06 <br /> Methylene Blue Active Substances 0.500 0.10 mg/L 0.500 ND 100 75-125 1.01 25 <br /> Matrix Spike Dup(CP05465-MSD2) Source:CPG0694-03 Prepared&Analyzed:07/21/06 <br /> Methylene Blue Active Substances 0.491 0.10 mg/L 0.500 ND y 98.2 75-125 3.21 25 <br /> Batch CP05471-General Preparation <br /> Blank(CP05471-BLKI) Prepared:07/24/06 Analyzed:07/25/06 <br /> Total Dissolved Solids ND 10 mg/L <br /> Batch CP05476-601 OA/No Digestion <br /> Blank(CP05476-BLKI) Prepared&Analyzed:07/21/06 <br /> Total Hardness as CaCO3 ND 1.0 mg/L <br /> LCS(CP05476-BS1) Prepared&Analyzed:07/21/06 <br /> Total Hardness as CaCO3 62.1 1.0 mg/L 66.2 93.8 80-120 20 <br /> LCS Dup(CP05476-BSD1) Prepared&Analyzed:07/21/06 <br /> Total Hardness as CaCO3 62.1 1.0 mg/L 66.2 93.8 80-120 0.00 20 <br /> Matrix Spike(CP05476-MS1) Source:CPG0651-01 Prepared&Analyzed:07/21/06 <br /> Total Hardness as CaCO3 341 1.0 mg/L 66.2 280 92.1 75-125 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 />