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~ ~ <br />United Companies, Inc. <br />March 21, 1994 <br />Page 7 <br />' dame that underlies the San Juan Mountains. Generally, the Mancos <br />shale formation is quite thick, however due to the up thrust of the <br />Snn Juan Mountains, the underlying Dakota sandstone formation <br />surfaces just a Pew nilea south oP the property. The Mancos Shales <br />and Dakota Sandstone are From the Cretaceous age and are overlying <br />sedimentary layers from Lhe Jurassic an8 Triassic age followed by <br />' Permian and Precambrian age deposits. The site lies on a flat <br />topped terrace of sand, gravel and cobblestones excavated Prom the <br />San Juan Mountains by glaciers and carried here by the Uncompahgre <br />River during the high glacial melt and runoff period. <br />' , To the west oP the site approximately 1/4 to 1/7 mile ie the toe of <br />the Uncompahgre Plateau and to the east beyond the Uncompahgre <br />' River is the north end of the Ciaarron Ridge which extends in a <br />~ south southeasterly direction. The proposed gravel pit property is <br />' located on the gently eloping valley floor about 1/a to 1/3 mile <br />I west of the Uncompahgre River. The slope of the site is to the <br />~ ' southeast at approximately 1 percent with 20 feet oP elevation <br />I <br />differential across the property. The site has an elevation at <br />' 6208 to 6228 feat above sea level and the general area is semi- <br />arid. <br />' No geologic hazards such as rock falls, landslides or etc. exist at <br />the Bite. The Vernal cloy loan soils are largely derived from <br />' Mancos shale and Mancos shale has relatively high eoneentratione of <br />sulfate and sodium salts. These salts may produce corrosion of <br />' concrete or metal objects in contact with the soil or rock. <br />Pursuant to CRS 74-]2-115(4)(d) mining operations are to remain 200 <br />feet or more from any significant, valuable and permanent man-made <br />structures unless it can be demonstrated the mining operation will <br />not adversely affect the stability of those strvetures. <br />' Tha only man-made structures that are known to exist within the 200 <br />1 <br />Colones Pit November 06 S-7 <br />