GENERAL50690 - Laserfiche WebLink

Home Browse Search

:r S-4 Vent -This vent is located immediately adjacent to the existing road that passes over the ridge and exits the area to the south. There is no dedicated access road associated with S-4 as it sits only a short distance off the main road. The S-4 site is stable and no sloughing or caving is occurring around the vent hole. The 7' diameter hole is covered with a fan and has a grate welded in place. Three transformers are mounted on a nearby pole, and the powerline and transformers are the property of the Operator. The S-4 site has very little vegetation, however, vegetation is sparse throughout this entire hillside of rocky outcrop. There is a power drop located south of S-4, midway to vent S-8. At this location there is a power pole and an armored cable hanging in a cased hole into the underground mine workings. S-5 Vent -Vent S-5 is located southeast of S-3 along the same access road into S-3. The access road past S-3 is rough, but the Operator prefers to not maintain this road in good shape as this encourages traffic into the general area and increases land use impacts. S-5 is an up-reamed and uncased 8' diameter hole located on flat ground on the top of a small hill. There is no fan on this hole, but it is covered with a grate welded in place. This site has been fenced by the Operator and marked with a "Danger" sign, as the ground under the concrete collar of the vent hole is sloughing and caving. There is no powerline to this site. The site is stable with no erosion, and natural revegetation is taking place and is comparable to the cover and composition in nearby undisturbed areas. The access road past the S-5 vent site is the road used to access the radio tower that was previously located on top of the peak to the north of S-5. The radio tower has been removed and the site is reclaimed. The road up to the radio tower is eroded in some places, but is passable in a field vehicle. This road is shown as a trail on the exiting topography maps of the area and may have existed as a trail before past operators used it to access the radio tower location. S-6 Vent -The S-6 vent is located to the southeast of S-1 in the cluster of three closely spaced vent holes. Access to this site is From the existing main road using the common access to S-1 and S-7, with the lower branch proceeding down to S-6. The vent hole was completely backfilled by the Operator in 2000 due to hazardous conditions at the location. The vent hole concrete collar had collapsed, and runoff was entering the cratered hole and causing it to expand. In addition to backfilling the vent hole, site drainage was modified to prevent recurrence of washing and erosion. There are no power facilities at this site. In the two seasons since the hole was backfilled, volunteer vegetation has been moving into the site, although the vegetation is weedy. In all, this site is now stable and secure. S-7 Vent -Vent S-7 is the third hole in the three-hole cluster of S-1, S-6, and S-7. The vent hole access is from the same road as S-1. All three vent holes in this cluster were served by the same powerline and transformer platform, so there are no electric facilities at this particular site. The hole has a fan in place and is covered with a steel grate welded in place. As with S-1 and S-6, this vent hole is located at a horizon typified by abundant green clay and silt. This material is soft and erodes easily, but the vent site is not dissimilar to natural erosion in areas with this same surface exposure of clay material. There is little vegetation growing on this site. S-8 Vent -The S-8 vent hole is the southernmost most site of the Operator's facilities and is located immediately adjacent to the existing main road through the area. There is no dedicated access road as the hole is close to the main road. The site is excavated in maroon and gray siltstone and shale and is practically void of vegetation. The site is stable and no erosion is 2