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COAL CREEK RE=SOURCE • • Page 5 general, ~Arriba' western wheatgrass will do best--seeded at a minimum rate of 16 lbs. PLS/acre with a drill, 32 lbs./acre if broadcast, There are other situations which may require something else. We can assist you whenever the need arises. E=XHIBIT G (Water Information) F'age G-3, second paragraph, item number 2 contains a rather dubious strategy for "sealing off sand layers and rerouting ground water." This section either needs technical clarification or elimination altogether. F'age G-3, third paragraph, states that the sandy alluvium remaining in the channel after mining will provide water to -the trees left in place. It's difficult for me to believe ~ 'this. Page G-4, first paragraph, item number 4: I have previously recommended the use of silt fence in favor of straw bales-- where site conditions don't call for something more substantial. ADDENDUM - Environmental Analysis :section B - Cottonwood Trees: Grazing has surely not encouraged survival of cottonwood seedlings along Coal Creek; but natural regeneration of cottonwoods is apparently .s pretty rare phenomenon even without grazing pressure. 'feeds which receive water and germinate must be located in a fairly stable portion of the flood plain to continue growth. Those which germinate in mid-stream are soon washed away. :seedlings lying in a suitable location depend on flood flows to bring additional water to sustain their growth. Until root systems develop well enough to tap the ground water, 7 the young seedlings are dependent on these flood events. 'small flows may not deliver water high enough up on the flood plain; those that are too large may erode even these seedlings. Mature cottonwoods possess a spreading network of shallow roots, not going deeper than necessary to extract water. A gradual drop in the water table will result in deeper root growth by the tree. If the drop is abrupt and long lasting, however, the tree will not likely be able to adjust,