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eh <br />ESPEY, HUSTON R ASSOCIATES, INC. <br />• <br />The overall rating given for each horizon is the rating for the most <br />limiting pazameter. In many cases the limiting factor is soil texture. The soils are <br />clayey and silty; most textures aze silty clay ]oams. Silty clay loam textures aze <br />only rated as fair sources of material. In most profiles, suitability decreases with <br />depth. <br />• <br />3.4.4 Volumes of Material Available <br />3.4.4.1 Northern No. 1 (FF-Seam) Mine <br />Table I-10 gives volumes of material available in the portions of the <br />Northern No. 1 (FF-Seam) Mine azea to be disturbed. The volumes were computed <br />as follows. The acreage of each map unit to be disturbed was measured. That area <br />includes the mine facilities area and the portion of the road to be widened. <br />Approximately 18 acres will be disturbed. The percent of the map unit occupied by <br />each series (from Section 3.2.1) was tabulated. The horizons and their ratings were <br />also tabulated (from Table I-8). The percentage of map unit occupied multipled by <br />the acres to be disturbed gives an estimate of acreage of each series to be <br />I-72 <br />