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CALIFORNIA LABT E VICES Page 18 of 28 07/27/06 10:19 ENGEO-Tracy Project: North Lathrop Properties 2880 N.Tracy Blvd Ste#3 Project Number: 5044.5.001.01 CLS Work Order#:CPG0655 Tracy,CA 95376 Project Manager: Zac Crawford COC#:69131 Conventional Chemistry Parameters by A Methods- Quality Control Analyte Reporting Spike Source %REC RPD y Result Limit Units Level Result %REC Limits RPD Limit Notes Batch CP05455-General Prep LCS(CP05455-BSI) Prepared&Analyzed: 07/21/06 Bromide 1.93 0.10 mg/L 2.00 96.5 80-120 20 Chloride 1.88 0.50 2.00 94.0 80-120 20 Sulfate as SO4 4.61 0.50 5.00 92.2 80-120 20 Nitrate as N 0.481 0.50 0.451 107 80-120 20 Nitrate/Nitrite as N 1050 400 pg/L 1060 99.1 80-120 20 LCS Dup(CP05455-BSDI) Prepared&Analyzed 07/21/06 Chloride 1.85 0.50 mg/L 2.00 92.5 80-120 1.61 20 Bromide 1.92 0.10 2.00 96.0 80-120 0.519 20 Sulfate as SO4 4.59 0.50 5.00 91.8 80-120 0.435 20 Nitrate as N 0.478 0.50 0.451 106 80-120 0.626 20 Nitrate/Nitrite as N 1040 400 gg/L 1060 98.1 80-120 0.957 20 Matrix Spike(CP05455-MSI) Source:CPG0683-01 Prepared&Analyzed:07/21/06 Bromide 2.03 0.10 mg/L 2.00 ND 102 75-125 25 Sulfate as SO4 283 0.50 5.00 24 86.0 75-125 25 Chloride 51.2 0.50 2.00 52 NR 75-125 25 QM-4X Nitrate/Nitrite as N 3390 400 pg/L 1060 2500 84.0 75-125 25 Nitrate as N 2.79 0.50 mg/L 0.451 2.5 64.3 75-125 25 QM-4X Matrix Spike Dup(CP05455-MSDI) Source: CPG0683-01 Prepared&Analyzed:07/21/06 Bromide 2.08 0.10 mg/L 2.00 ND 104 75-125 2.43 25 Chloride 51.2 0.50 2.00 52 NR 75-125 0.00 25 " QM-4X Sulfate as SO4 28.4 0.50 5.00 24 88.0 75-125 0.353 25 Nitrate as N 2.81 0.50 0.451 2.5 68.7 75-125 0.714 25 QM-4X Nitrate/Nitrite as N 3420 400 pg/L 1060 2500 86.8 75-125 0.881 25 CA DOHS FLAP Accreditation/Registration Number 1233 3249 Fitzgerald Road Rancho Cordova,CA 95742 WWW.Californialab.com 916-638-7301 Fax: 916-638-4510