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EXHIBIT R -4 <br />..1 <br />SOIL CONDITIONS IMPACT RATING <br />a. Cover Soil Availability <br />The impact rating is a function of the type and the amount of soil <br />available. well- drained soils are best suited as cover soils. <br />Soil Characteristics well Drained/ Poorly Drained/ <br />Permeable Impermeable <br />Depth to Bedrock (Feet) Impact Rating, B <br />>30 <br />0 <br />2 <br />20 -30 <br />1 <br />3 <br />10 -20 <br />2 <br />4 <br /><10 <br />3 <br />5 <br />b. Liner Soil AvailabilitY <br />The impact rating is a function of the type and amount of soil <br />available. Clayey, highly - impermeable soils are best suited for <br />liner and cap construction. <br />Soil Characteristics well Drained/ Poorly Drained/ <br />Permeable Impermeable <br />Depth to Bedrock (Feet) <br />>30 <br />20 -30 <br />10 -20 <br /><10 <br />5 -22 -91 <br />2 <br />3 <br />4 <br />5 <br />Impact Rating, B <br />0 <br />1 <br />2 <br />3 <br />37 <br />