ARCHIVED REPORTS 2ND QUARTER 2010

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June 9, 2010 Lab ID : STK1033632 City of Lathrop Groundwater Monitoring Customer : 3-16663 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Metals Boron 200.7 MS mg/L 4.000 101% 75-125 (SP 1004137-001) MSD mg/L 4.000 97.9% 75-125 MSRPD m /L 798.8 2.5% <20.0 200.7 05/05/2010:205218 CCV ppm 5.000 100% 90-110 CCB ppm 0.002 0.10 CCV ppm 5.000 101% 90-110 CCB ppm 0.027 0.10 CCV ppm 5.000 99.5% 90-110 CCB ppru 0.026 0.10 Calcium 200.7 MS mg/L 12.50 76.3% 75-125 (SP 1004137-001) MSD mg/L 12.50 53.8% <�/4 MSRPD mg/L 798.8 1.8% <20.0 200.7 05/05/2010:205218 CCV ppm 25.00 101% 90-110 CCB ppm -0.001 1.0 CCV ppm 25.00 101% 90-110 CCB ppm 0.04 1.0 CCV ppm 25.00 101% 90-110 CCB ppm -0.0008 1.0 Copper 200.7 MS ug/L 800.0 102% 75-125 (SP 1004137-001) MSD ug/L 800.0 98.5% 75-125 MSRPD u 798.8 3.3% <20.0 200.7 05/05/2010:205218 CCV ppm 1.000 99.3% 90-110 CCB ppm 0.00003 0.01 CCV ppm 1.000 101% 90-110 CCB ppm -0.00003 0.01 CCV ppm 1.000 98.3% 90-110 CCB ppm 0.0001 0.01 Iron 200.7 MS ug/L 3992 99.1% 75-125 (SP 1004137-001) MSD ug/L 3992 96.3% 75-125 MSRPD u 798.8 2.8% <20.0 200.7 05/05/2010:205218 CCV ppm 4.990 101% 90-110 CCB ppm 0.0003 0.05 CCV ppm 4.990 102% 90-110 CCB ppm 0.0011 0.05 CCV ppm 4.990 100% 90-110 CCB ppro 0.0029 0.05 Magnesium 200.7 MS mg/L 12.50 98.7% 75-125 (SP 1004137-001) MSD mg/L 12.50 88.3% 75-125 MSRPD m /L 798.8 2.1% <20.0 200.7 05/05/2010:205218 CCV ppm 25.00 97.6% 90-110 CCB ppm 0.00009 1.0 CCV ppm 25.00 98.7% 90-110 CCB ppm 0.0003 1.0 CCV ppm 25.00 97.4% 90-110 CCB ppm 0.002 1.0 Manganese 200.7 MS ug/L 800.0 97.3% 75-125 (SP 1004137-001) MSD ug/L 800.0 94.6% 75-125 MSRPD ug/L 798.8 2.0% <20.0 200.7 05/05/2010:205218 CCV ppm 1.000 98.2% 90-110 CCB ppm 0.00002 0.01 CCV ppm 1.000 98.8% 90-110 CCB ppm 0.00001 0.01 CCV ppm 1.000 97.9% 90-110 CCB ppro 0.00004 0.01 Potassium 1 200.7 IMS I m /L 1 12.50 1 113% 1 75-125 Page 23 of 27