ARCHIVED REPORTS 2ND QUARTER 2010

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June 9, 2010 Lab ID : STKI033632 City of Lathrop Groundwater Monitoring Customer : 3-16663 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Chloride 300.0 05/04/2010:204455 LCS mg/L 25.00 96.6% 90-110 MS mg/L 500.0 99.4% 86-128 (STK1033622-001) MSD mg/L 500.0 101% 86-128 MSRPD mg/L 100.0 1.5% <23.0 300.0 05/04/2010:205360 CCB ppm 0.09 1 CCV ppm 25.00 98.0% 90-110 CCB ppm 0.17 1 CCV ppm 25.00 99.5% 90-110 CCB ppm 0.16 1 CCV ppm 25.00 99.5% 1 90-110 Fluoride 300.0 05/04/2010:204455 LCS mg/L 2.500 97.1% 90-110 MS mg/L 50.00 97.4% 81-126 (STK1033622-001) MSD mg/L 50.00 102% 81-126 MSRPD m /L 100.0 4.2% <12.1 300.0 05/04/2010:205360 CCB ppm -0.030 0.1 CCV ppm 2.500 99.6% 90-110 CCB ppm -0.031 0.1 CCV ppm 2.500 100% 90-110 CCB ppm -0.027 0.1 CCV ppm 2.500 99.9% 1 90-110 Nitrate 300.0 05/04/2010:204455 LCS mg/L 20.00 96.0% 90-110 MS mg/L 400.0 100% 88-124 (STK1033622-001) MSD mg/L 400.0 99.9% 88-124 MSRPD m /L 100.0 0.2% <29.1 300.0 05/04/2010:205360 CCB ppm 0.125 0.4 CCV ppm 20.00 98.0% 90-110 CCB ppm 0.095 0.4 CCV ppm 20.00 98.3% 90-110 CCB ppm 0.118 0.4 CCV PPM 20.00 97.7% 1 90-110 Nitrite 300.0 05/04/2010:204455 LCS mg/L 15.00 104% 90-110 MS mg/L 300.0 101% 91-121 (STK1033622-001) MSD mg/L 300.0 102% 91-121 MSRPD m /L 100.0 1.2% <23.8 300.0 05/04/2010:205360 CCB ppm -0.070 0.3 CCV ppm 15.00 104% 90-110 CCB ppm -0.071 0.3 CCV ppm 15.00 102% 90-110 CCB ppm -0.065 0.3 CCV ppm 15.00 107% 1 90-110 Sulfate 300.0 05/04/2010:204455 LCS mg/L 50.00 97.1% 90-110 MS mg/L 1000 101% 78-137 (STK1033622-001) MSD mg/L 1000 101% 78-137 MSRPD m /L 100.0 0.4% <12.3 300.0 05/04/2010:205360 CCB ppm -0.11 2 CCV ppm 50.00 99.1% 90-110 CCB ppm 0.06 2 CCV ppm 50.00 99.6% 90-110 CCB ppm -0.005 2 CCV ppm 50.00 99.6% 1 90-110 Nitrogen,Total Kjeldahl 351.2 05/11/2010:204709 Blank mg/L ND <1 LCS mg/L 10.00 52.6% 41-148 LCS mg/L 10.00 64.8% 41-148 MS I mg/L 0.4000 61.8% 25-149 Page 25 of 27