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ERO Resources <br />soil series descriptions in Illustration 8 are denoted by pit number in <br />• the descriptions. <br />e. TOPSOIL CFU)RACTERIZATION <br />Table I-1 lists each mapping unit with its topsoil suitability rating from <br />Class 1 to 4 and estimated average depth. Class 1 soils have the greatest <br />quantity of suitable topsoil while Class 4 lands have no suitable <br />material. The topsoil suitability class ifioation is described in the <br />ensuing discussion. <br />Seleoted charaoteristics affecting the suitability of the soils for <br />topsoil material are in Table I-2. These data provide a guide for <br />evaluating coils prior to and during mining. Thsss data have been <br />incorporated in the map unit dssoriptions to provide the basin information <br />necessary for stripping, etockpilirg and replacing suitable topsoil <br />materials. <br />• The depths listed in Tales I-I and I-3 for suitable topsoil materials are <br />averages for the soil series phase, soils series variant or soil series <br />complex. They were derived from field inspection and may not match <br />exactly the depths provided in the soil profile descriptions (illustration <br />B) or laboratory data (Illustration C) for the typifying pedon. The <br />computation of estimated average depth of topsoil is shown in Table i-3. <br />Illustrations A and B provide details of mapping units and series <br />descriptions. <br /> <br />II.I- 3 <br />