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Pre Mine Drainage Calculations <br />• 155.43 acre drainage area (See Map 2.05.3(3) -1) <br />• Curve Number (CN) to use: From SEDCAD 4 for Windows Help menu: <br />I. Curve Numbers for Other Agricultural Land Category <br />II. Cover type: Pasture, grassland, or range -- continuous forage for grazing <br />III. Hydrologic Condition: Good ( Good: >75% ground cover) <br />IV. Hydrologic Soil Group = C <br />V. CN =74 <br />Runoff Curve Number and Runoff <br />Project: Pond 011 By: B Langenfeld Date: 08/17109 <br />Present <br />1. Runoff Curve Number (CN) <br />Cover description <br />Pasture Grassland Range (Good) <br />Pasture Grassland Range (Good) <br />Pasture Grassland Range (Good) <br />Pasture Grassland Range (Good) <br />Pasture Grassland Range (Good) <br />CN (weighted): 74.0 <br />Total Area: 155.443 Acre <br />CN Soil Type Area(Acre) <br />74 <br />C <br />1.839 <br />74 <br />C <br />46.185 <br />74 <br />C <br />74.138 <br />74 <br />C <br />29.121 <br />74 <br />C <br />4.160 <br />REVISED AUGUST 2009 Attachment 2.05.3(3) -14 -5 <br />