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<br />because the total area disturbed by mitring is so small, it <br />is highly unlikely that any decrease in natural subirriga- <br />tion along Bolton Draw will be detectable. <br />It is further unlikely that seepage from sedimentation pond <br />4 will be a problem. However, even if minor seepage occurs <br />through the life of the pond, it is even more unlikely that <br />potential salt-laden waters will impact main Bolton Draw <br />any more than it already has been. Page 10 of this Addendum <br />states that the Spicerton Soil Series indicative of down- <br />stream Main Bolton Draw is already heavily laden with "Salts <br />sufficient to affect plant growth..." It is further stated <br />as to the natural subirrigation potential that "...much of <br />the soil moisture is not available for plants because of the <br />salt content." This is evident by the common types of <br />vegetative species occuring in the downstream reaches of <br />Main Bolton Draw (referred to on Page 10 of this Addendum). <br />Also, in reference to the BLM's TEA #CO-010-9-163 Section IV <br />1d, Wyoming Fuel Company will obtain written permission from <br />the BLM before mining through the North Fork of Bolton Draw. <br />2.10 Maps and Plans <br />2.10(2) Permit & Adjacent Areas <br />C J <br />Wyoming Fuel Company will provide the necessary profess- <br />ional engineer certification on all maps and drawings as <br />required. <br />4.05 Hydrologic Balance <br />4.05.6 Sediment Ponds <br />Designs for Pit #1, Pond #1 as well as the diversions are <br />found in Attachment 2. The emergency spillway elevations <br />for the ponds describes the maximum water level during the <br />25 year 24 hour event, as the spillways have been designed <br />for this event. <br />4.05.6(3)(b) A marker as shown on Figure 2 from original appli- <br />cation (revised July 28, 1981) will be constructed <br />to show 60~ and 1008 sediment levels but will only <br />be visible when the pond is dry. <br />4.05.6(3)(b) Wyoming Fuel will maintain a 1" opening in the gate <br />of the dewatering device at all times. <br />4.08 Use of Explosives <br />4.08.2 Pre-blasting Survey <br />Wyoming Fuel Company will notify MST of their right to a <br />pre-blasting survey and conduct one if they desire. <br />