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pH (1 to 1 Water)-San Miguel Area, Colorado, Parts of Dolores, Montrose, and <br />San Miguel Counties <br />pH (1 to 1 Water) <br />'J-Bird Mine Site <br />pH (1 to 1 Water)-Summary by Map Unit-San MiguelArea, Colorado, Parts of Dolores, Montrose, and San Miguel Counties <br />Map unit symbol Map unit name Rating Acres in AOI Percent of AOI <br />108 t4O ha stony clay loam, 3 to <br />perc ent slopes 8.1 7.3 100.0% <br />Totals for Area of Interest 7.3 100.0% <br />Description <br />Soil reaction is a measure of acidity or alkalinity. It is important in selecting crops <br />and other plants, in evaluating soil amendments for fertility and stabilization, and in <br />determining the risk of corrosion. In general, soils that are either highly alkaline or <br />highly acid are likely to be very corrosive to steel. The most common soil laboratory <br />measurement of pH is the 1:1 water method. A crushed soil sample is mixed with <br />an equal amount of water, and a measurement is made of the suspension. <br />For each soil layer, this attribute is actually recorded as three separate values in <br />the database. A low value and a high value indicate the range of this attribute for <br />the soil component. A "representative" value indicates the expected value of this <br />attribute for the component. For this soil property, only the representative value is <br />used. <br />Rating Options <br />Aggregation Method: Dominant Component <br />Component Percent Cutoff: None Specified <br />Tie-break Rule: Higher <br />Interpret Nulls as Zero: No <br />Layer Options: All Layers <br />Natural Resources Web Soil Survey 2.1 12/2412008 <br />Conservation Service National Cooperative Soil Survey Page 3 of 3