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TABLE C-1 GROUNDWATER ANALYTICAL RESULTS-GENERAL MINERALS US CAN-WELTY ROAD Vernalis,California Sample ID,Date, Analytical Result MW-5 Analysis Analytical Method Units (1/23/2007) MCL WQO Alkalinity (to pH 8.3) SM 20 2320B (as L <460 NA NA Alkalinity(to pH 4.5) SM 20 2320B (as CaL 347,000 NA NA Ammonia Nitrogen EPA 350.2 µg/L <200 NA 1,500 2 Bicarbonate SM 20 2320B (as CaL 347,000 NA NA Boron SW846 6010B µg/L 1,090 F NA 600 3 Calcium SW846 6010B µg/L 148,000 F NA NA Carbonate SM 20 2320B (as L <460 NA NA Chloride EPA 300.0 µg/L 202,000 250,000 RS 106,000 1 Hardness SM 18 2340B µg/L 540,000 F NA NA Iron SW846 6010B µg/L <52.2 F 300 S 300 2 Kjeldahl Nitrogen EPA 351.2 µg/L <500 NA NA Magnesium SW846 6010B µg/L 41,300 F NA NA Manganese SW846 6010B µg/L 12.9 F 50 S 50 2 Nitrate Nitrogen EPA 300.0 µg/L 7,200 10,000 P 10,000 3 Nitrite Nitrogen EPA 300.0 µg/L <400 1,000 P NA 3 Phosphate EPA 365.1 µg/L <80 NA NA Potassium SW846 6010B µg/L 2,280 F NA NA Sodium SW846 6010B µg/L 111,000 F NA 20,000 3 Specific Conductance EPA 120.1 umhos/cm 1,470 900,000 RS 700,000 1 Sulfate EPA 300.0 µg/L 147,000 250,000 RS 10,000 2 Total Dissolved Solids EPA 160.1 µg/L 884,000 500,000 RS 450,000 1 Abbreviations: <=Not detected at or above laboratory as received MDL CaCO3=Calcium carbonate EPA=U.S.Environmental Protection Agency F=Sample was field-filtered. ID=Identification MCL=-Maximum contaminant Level,United States Environmental Protection Agency/California Department of Health Services; P=Primary MCL RS=Recommended Secondary MCL S=Secondary MCL MW=Monitoring well NA=Not analyzed SM=Standard Method SW=Solid waste µg/L=Micrograms per liter umhos/cm=Micromhos per centimeter WQO=Qater Quality Objective(From A Compilation of Water Quality Goals,Regional Water Quality Control Board,Central Valley Region,2003 1=Agricultural 2=Taste and Odor Threshold 3=Suggested No Adverse Response Level SAIC F—Som-M&M.8 rte Page 1 of 1