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June 9, 2010 Lab ID : STK1033632 <br /> City of Lathrop Groundwater Monitoring Customer : 3-16663 <br /> Quality Control-Inorganic <br /> Constituent Method Date/1D Type Units Conc. QC Data DQO Note <br /> Metals <br /> Potassium 200.7 (SP 1004137-001) MSD mg/L 12.50 110% 75-125 <br /> MSRPD m 798.8 2.2% <20.0 <br /> 200.7 05/05/2010:205218 CCV ppm 25.00 97.7% 90-110 <br /> CCB ppm -0.004 1.0 <br /> CCV ppm 25.00 98.6% 90-110 <br /> CCB ppm -0.0003 1.0 <br /> CCV ppm 25.00 97.2% 90-110 <br /> CCB ppm 0.008 1.0 <br /> Sodium 200.7 MS mg/L 12.50 100% 75-125 <br /> (SP 1004137-001) MSD mg/L 12.50 87.6% 75-125 <br /> MSRPD m 798.8 1.4% <20.0 <br /> 200.7 05/05/2010:205218 CCV ppm 25.00 96.7% 90-110 <br /> CCB ppm -0.14 1.0 <br /> CCV ppm 25.00 95.5% 90-110 <br /> CCB ppm -0.16 1.0 <br /> CCV ppm 25.00 95.4% 90-110 <br /> CCB ppm -0.07 1.0 <br /> CCV ppm 25.00 94.7% 90-110 <br /> CCB ppm -0.11 1.0 <br /> inc 200.7 MS ug/L 2000 100% 75-125 <br /> (SP 1004137-001) MSD ug/L 2000 97.8% 75-125 <br /> MSRPD u /L 798.8 2.7% <20.0 <br /> 200.7 05/05/2010:205218 CCV ppm 1.000 99.9% 90-110 <br /> CCB ppm -0.0011 0.02 <br /> CCV ppm 1.000 100% 90-110 <br /> CCB ppm -0.0009 0.02 <br /> CCV ppm 1.000 100% 90-110 <br /> CCB PPM -0.0003 1 0.02 <br /> Barium 200.8 MS ug/L 5.000 46.0% <'/4 <br /> (STK1033632-001) MSD ug/L 5.000 14.0% <'/4 <br /> MSRPD ug/L 5.000 1.2% <20 <br /> 200.8 05/14/2010:205699 ICV ppb 120.0 99.6% 90-110 <br /> ICB ppb -0.081 0.2 <br /> CCV ppb 120.0 97.8% 90-110 <br /> CCB ppb 0.112 0.2 <br /> CCB ppb -0.061 0.2 <br /> CCV ppb 120.0 101% 90-110 <br /> CCB ppb 0.172 1 0.2 <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B SP 1004077-002 Dup m 4.5% 3.42 440 <br /> 2320B 05/06/2010:205292 CCV mg/L 234.9 103% 90-110 <br /> CCV m 234.9 100% 90-110 <br /> Bicarbonate 2320B (SP 1004077-002) Dup mg/L 4.4% 4.78 <br /> Carbonate 2320B (SP 1004077-002) Dup m 0.0 10 <br /> Hydroxide 2320B (SP 1004077-002) Dup mg/L 0.0 10 <br /> Conductivity 2510B 05/04/2010:205150 ICB umbos/cm 0.1 1 <br /> ICV umhos/cm 995.0 98.4% 95-105 <br /> CCV umbos/cm 995.0 98.4% 95-105 <br /> E.C. 2510B 05/04/2010:204440 Blank umhos/cm ND <1 <br /> (SP 1004077-002) Dup umhos/cm 0.0% 0.372 <br /> Solids,Total Dissolved 2540 G 05/05/2010:204474 Blank mg/L ND <20 <br /> LCS mg/L 995.0 98.0% 90-110 <br /> LCS mg/L 995.0 98.4% 90-110 <br /> (STK1033674-003) Du m 0.5% 10.0 <br /> Page 24 of 27 <br />