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HISTORICAL SUMMARY OF ANALYTICAL RESULTS GROUNDWATER ® CORRAL HOLLOW SANITARY LAN* MW-9A Units:mg/l,unless noted Sample Designation MW-9A MW-9A MW-9A Sampling Date 5/21/12 7/16/12 10/15/12 Constituents of Concern Parameters Alkalinity as CaCO3 95 92 NR Carbonate Alkalinity as CaCO3 <2.5 <2.5 NR Bicarbonate Alkalinity as HCO3 120 110 NR Hydroxide Alkalinity as CaCO3 NR NR NR Cyanide <0.0016 NR NR Sulfide <0.050 NR NR Total Organic Carbon 12 NR NR Nitrate-Nitrogen 34 34 34 Sulfate 21 17 16 Calcium 61 NR NR Potassium 8.7 NR NR Magnesium 23 NR NR Sodium 94 NR NR Metals Aluminum,Dissolved <0.026 NR NR Antimony,Dissolved <0.010 NR NR Arsenic,Dissolved 0,0052 NR NR Barium,Dissolved 0.027 NR NR Beryllium,Dissolved <0.001 NR NR Boron,Dissolved N/A NR NR Cadmium,Dissolved <0.001 NR NR Chromium Total Dissolved 0.030 NR NR Chromium Hexavalent 0.030 NR NR Cobalt,Dissolved <O.A05 NR NR Copper,Dissolved <0.0023 NR NR Iron,Dissolved <0.005 NR NR Lead,Dissolved <0.001 NR NR Manganese,Dissolved 0.0017 NR NR Mercury,Dissolved 0.000035 NR NR Nickel,Dissolved 0.00098 NR NR Selenium,Dissolved 0.0035 NR NR Silver,Dissolved <0.0011 NR NR Thallium,Dissolved <0.015 NR NR Tin,Dissolved <0.005 NR NR Vanadium,Dissolved 0.0045 NR NR Zinc,Dissolved <0.0059 NR NR Semivolatile Organic Com op ands(EPA Method 3520/8270) Bis(2-ethylhexyl)Phthalate All Compounds ND NR NR Organophosphate Pesticides (EPA Method 8141A) All Compounds ND NR NR •=Trace Concentration [1]This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. (1)Parameter also detected in one or more quality control blanks ND=Not Detected _ NM=Not Measured NA=Not Required