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<br />
<br />Siloam Stone -Bedrock Mine #1
<br />January 7, 1998
<br />
<br />Exhibit J -Vegetation -Addendum (coat)
<br />StE - Stroupe extremely stony
<br />loam, 9 to 25g slopes
<br />BNAI.I.OW ROOTR11.1.8 RANGE BITE
<br />This range site is made up of moderately permeable
<br />to slowly permeable soils t}lat have a sllrfnce layer of
<br />channery loam or stony loam. The slope is 3 l0 26
<br />percent. The available water capacity is low or very
<br />low. The annual precipitation is about 16 inches, and
<br />most of the precipitation falls during Lhlllldel•storms
<br />in the period April to September. The low available
<br />water capacity affects the kind and amount of vegeta-
<br />tion produced on these soils.
<br />The approximate potential plant community is made
<br />up of 20 percent side-oats grams, 15 percent Scribners
<br />needlegress, 10 pel•cellt little bluestem, 10 percent big
<br />bluestem, 10 percent needleandlhread and New Mexico
<br />needlegress, 6 percent Indian ricegrass, 5 percent
<br />mountain mullly, 6 percent Arizona fescue, 5 percent
<br />western wheatgrass, 6 percent blue grams, 6 percent
<br />juniper, 6 percent pinyon, 3 percent mountainmahog-
<br />any; and 2 percent squawbush.
<br />If the site is in excellent condition, the total annual
<br />yield is about 500 pounds of air-dry herbage per acre
<br />daring years of favorable moisture and about 100
<br />pounds per acre in other years. Of this, about 80 per-
<br />cent is from plants that provide forage for cattle.
<br />If this site is heavily grazed for a long period of
<br />years, the needlegrasses,the ricegrnsses,the Lluestems,
<br />mountain mutely, and Arizona fescue decrease or dis-
<br />appear and are replaced Ly blue grams and send drop-
<br />aeed. Continued heavy grazing or further depletion of
<br />the vegetation permits the invasion of annual (orbs,
<br />cactus, yucca, pinyon, juniper, oakbruah, rose, and
<br />eleepygraes.
<br />wo - wormser silt loam
<br />CLAYEY FOOTIIII.I.B RANGE BITE
<br />This range site ie made up oP slowly permeabe soils
<br />that have a surface layer of clay loam or silt loam.
<br />The slope is 1 l0 0 percent. The available water capac-
<br />ity is moderate to high. The annual precipitation is
<br />about 17 inches, and most of the precipitation falls
<br />during thunderstorms in the period April to Septem-
<br />Ler. The clayey surface layer and moderate depth to
<br />bedrock largely determine the kind and amount of
<br />vegetation produced on these soils.
<br />The approximate potential plant community is made
<br />up of about 30 percent western wheatgrass, 16 percent
<br />needleandlhread, 16 percent side-oats grams, ]0 per-
<br />cent little Iluestem, 10 percent blg bluestem, 6 percent
<br />mountain mutely, 6 percent Arizona fescue, 6 percent
<br />low I•abbitbrush, and 6 percent other plants.
<br />If the site is in excellent condition, the total annual
<br />yield is about 800 pounds of air-dl•y herbage per acre
<br />in years of favorable moisture and 600 pounds per
<br />acre in other years. Of this, about 86 percent is from
<br />plants that provide forage for cattle.
<br />if this site is heavily grazed for a long period of
<br />years, the bluestems, needleandlhread, and western
<br />wheulbrass decrease or disappear and are replaced by
<br />blue grams, three-awn, and bluegrass. Cmltinued heavy
<br />grazing or further depletion of the vegetation permits
<br />the invasion of annual weeds, pinyon, juniper, sleepy-
<br />grass, bluegrass, pricklypear, and hairy goldenaster.
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