Laserfiche WebLink
material from entering the Reservoir. See cross sections for Zones 3 and 4 on Figure GS- <br /> I. <br /> e) The Cross sections on Figure GS-1 for Zones 3 and 4 were made from the surface topo <br /> and the Ground Engineering drill hole data from 2018. They show that the quantity of <br /> tailings dumped over the edge of the slope many years ago and the colluvium are <br /> relatively shallow compared to the bedrock. This shows that it is not possible that a very <br /> large amount of material could slide and end up in the reservoir. The Reservoir is <br /> sufficiently far away to the west. <br /> f) Zone 5 has not been disturbed and as addressed in the Ground Engineering Report,this <br /> area is stable and has never failed in the past and shows no signs of any future failure. <br /> The amount of slope is much less and the distance to the reservoir is significant therefore, <br /> the Reservoir should not be considered a critical structure for this slope. <br /> g) The Denver Water Board Road has a dirt surface and is used daily by Water Board <br /> personnel although the frequency is low. This road is not a public road and therefore <br /> does not qualify as a critical structure. Also, any potential failure in any of the Zones <br /> would be more like a creep flow, not an instantaneous failure. If a future slide occurred, <br /> anyone on the road would be able to see the slide and not get trapped in it. To our <br /> knowledge,the road is rarely, if ever, used at night. For this reason, it is extremely <br /> unlikely that there is a threat to human life if a failure occurred in any of the Zones. <br /> h) The Water Board has a 24"plastic water pipe that is buried along their road, as shown on <br /> Figure GS-1. This structure cannot be considered critical since it is buried by <br /> approximately 3 feet of compacted fill and the analysis of Zone failures shows that the <br /> circular failures in all zones occurs well above the area of the Pipe and the Road. For this <br /> reason, any failure in the zones would not disrupt the pipe. In the extremely unlikely case <br /> of a zone failure above the road, any slide material would simply pass over the pipe. <br /> i) According to the definitions of critical structures,there are no other structures that would <br /> meet the criteria, such as leach pads, tailings facilities, residences, utilities, effluent <br /> ponds, milling facilities, overburden/waste rock storage facilities, hazardous/toxic <br /> material storage facilities or any other facilities that could be considered critical below <br /> any of the Zone slopes. <br /> Ralston Quarry Greg 1, kti sod AswmWs.P1.1A' <br /> January 2019 GS-6 <br />