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the ground cover existing before redisturbance, and will be adequate to <br /> control erosion. Revised Exhibit 13-1a "Postmining Vegetation Map" , <br /> details the above areas. <br /> The ground cover, herein referred to as vegetative cover, existing <br /> before redisturbance will be documented during the summer of 1937 by <br /> collecting vegetative cover data on previously reclaimed areas in the <br /> southeast portion of the Nucla Mine (generally, the N2NEA Section 36 <br /> T47N R16W and the SWA NWi Section 31 T47N R15W) . The vegetative cover <br /> value determined from this sampling will be compared to the vegetative <br /> cover values for the newly revegetated areas where Rule 4. 15. 10 applies. <br /> The cover for the revegetated areas will be acceptable when the <br /> vegetative cover values for the revegetated areas are at least 90 <br /> percent of the cover value determined from the 1987 cover sampling with <br /> 90 percent statistical confidence. If precipitation in 1987 (up to the <br /> time of sampling) is abnormally high, sampling to determine the cover <br /> value for comparison may be delayed until the 1988 field season, with <br /> concurrence from the Division. <br /> Production. The concept of an alternate production standard based on <br /> USDA technical documents allowed for in Rule 4.15.7(2)(d)(ii ) and <br /> presented in the Nucla Permit Revision is to be retained. As agreed to <br /> in the February 27 meeting, the following modifications to the technical <br /> standard and additional supporting documentation are presented as <br /> follows. <br /> The technical standard proposed is based on the potential productivity <br /> of the Shavano and Persayo soils as reported on the Soil Conservation <br /> Service (SCS) Form 5's included in the recently completed western San <br /> Miguel/Montrose County Soil Survey that includes the Nucla area . The <br /> Soil Survey is not formally published at this time, however, tale SCS <br /> Form 5 information is available and will be forwarded to the Division <br /> upon receipt of the Form 5's from the SCS office in Montrose. The <br /> potential productivity values used were documented in a phone <br /> conversation to Barb Cencich, SCS, Soils Party Leader, Montrose, <br /> Colorado. <br /> 21 <br />