Laserfiche WebLink
<br />DISCUSSION OF SLOPE: The generalized slope appears to be a modified transitional type, <br />consisting of colluvial talus debris later altered to a moraine-type formation by late glaciation. There <br />are a number of minor scarps, but none were in the proposed permit azea. The Peneral slope is in <br />the range of 40% to 60%, but the area of interest ranges from 20% to 30% on natural terrace-like ~ <br />areas. In my opinion the proposed work areas should be classified as on a Potentially Unstable <br />~R~. There is much to verify this opinion, and that the localized area maybe increasing in stability <br />since the early reports on the area. A single access road with two switchbacks traverses the slope <br />in the area of interest, and has remained unchanged and driveable for at least 25 years; no natural <br />springs, water seepage, or ponds have been observed; and no trees are out of vertical on the proposed <br />work area. And the toe of the main slope on the flat valley floor near the highway, below the work <br />area, has apparently stabilized, as there has been no movement for many years. Another factor that <br />may be important in this particular area is its microclimate. it has been considered very important <br />in slope studies in other areas in Gunnison County by Jim Soule of the State Geological Survey. <br />Such conditions as lower altitude; south facing slopes; warmer and dryer climate; less snow and <br />shorter snow retention; and less annual precipitation (30 inches and that only in July and August); <br />and 'especially on lower slopes immediately above the valley floors'. All of these factors are present <br />in the site area, and have resulted in increased slope stability in similar areas in the County. See <br />References, Soule I.M., 1976. pgs 5, 6 ,and l5. <br />PLAN OF OPERATION: I understand the requested permit azea is 9.7± acres in size, with the north <br />and east lines being the section lines of Section 28, which is on private land, with possible residential <br />zoning classification. I also understand that only the present access road will be used -that no work <br />will be below that road- and that loading of rock will be by hand, or very lite loading equipment - <br />that only level excavating will be done -and no explosives will be used -and no permanent <br />structures will be built. And most of the rock will be removed from the low-angle areas on the slope. <br />I also understand that tonnage of rock removed will range between 200 and 2500 tons per year, and <br />all processing of building stone, ornamental stone, etc. will be done at a company location off the <br />property. The attached map by William Balaz P.E. shows the work areas, the access road, the <br />highway, and the section lines. You will note that the work will be 250 feet horizontally north, and <br />100 feet vertically above the highway which is well above the toe of the slope. <br />DISCUSSION OF HAZARDS: Because of the site conditions, and the simplicity of the proposed <br />operation plan, the list of hazards is short. To protect the present integrity of the slope, and the <br />people or property that might be affected, is of primary concern. In my opinion, the removal of <br />minor tonnage, from a few very localized areas, and the creation of a few limited terraces will have <br />very little effect on the v r slope area. Another point -there is a small 680 squaze foot house <br />built in 1967 located on Section 28 property 50 feet north of the highway and 200 feet south of the <br />tip of the slope. This structure is owned by the landowner and is too far from the localized work- <br />azea to be at risk. <br />CONCLUSIONS: I understand Balaz and Associates, Inc. of Palisade, Colorado, are assisting the <br />Company in seeking a special use permit as recommended by the Colorado Division of Minerals and <br />Geology for the removal or 'harvesting' of the talus material located on the surface of the special <br />permit area. This operation should improve slope and construction conditions for future possible <br />qualification as residential sites. <br />