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2017-02-15_REVISION - C1981041
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2017-02-15_REVISION - C1981041
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Last modified
2/16/2017 6:57:50 AM
Creation date
2/16/2017 6:44:22 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Revision
Doc Date
2/15/2017
Doc Name
Comments to Proposed Decision Approving Snowcap Repair Plan
From
James A Beckwith
To
DRMS
Type & Sequence
TR69
Email Name
JHB
JRS
Media Type
D
Archive
No
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North Anomaly <br />The north near surface anomaly (NSA) is shown on Figure 2 of Fugro's August 23, 2016 <br />report. The ERT survey did not show a connection between the north NSA and the air <br />shaft. The excavation shown on Figure 14-17 uncovers a portion of the north NSA. <br />Mitigation of this area will be to place and compact the native soils back up to original <br />grade. <br />Rock Pile Sinkhole <br />The rock pile sinkhole feature is shown on Figure 14-17 and Figure 3 of Fugro's August <br />23, 2016 report. Although Fugro's August report identified two other horizontal <br />anomalies, the data did not identify any horizontal anomaly extending from the rock pile <br />feature. Water was dumped into this feature prior to the survey and as a result, any <br />horizontal anomaly extending from this location would have been identified during the <br />survey. During the addition of water to the rock pile sinkhole, the water reached <br />equilibrium and overfilled, spilling out on to the adjacent ground. The water did not <br />disappear down hole which indicates no hydrologic connectivity. No mitigation is <br />proposed for the rock pile sinkhole. <br />Surface Disturbance <br />The backhoe repair plan will disturb 0.4 acres. The existing light use road encompasses <br />0.15 acres. If a reclaimed area involves a very small acreage, there are both practical as <br />well as statistical limitations to success evaluations. Please see Appendix 14-16 for a <br />discussion of how this small reclaimed area can achieve revegetation success. <br />Sediment Control <br />Run-off from the repair area and adjacent light use road is not directed to a sediment <br />pond. Run-off from the light use road will flow to the Fontanari ditch or the Carey pond <br />so there will be no offsite impacts from the light use road. Run-off from the repair area <br />will be filtered through sediment traps. The sediment traps will be straw bales, silt <br />fences, straw logs, straw wattles or other approved devices. The sediments traps will <br />slow and remove sediment from repair area run-off. <br />Topsoil <br />In an effort to establish ground cover of living plants not less than required to control <br />erosion and vegetation that is equal to or greater than the adjacent area, SCC will strip <br />the top 6" of topsoil and place in a stockpile as shown in Figure 14-17. <br />Topsoil stockpiles will be constructed to reduce erosion of the stockpiles by either wind <br />or water. The topsoil stockpiles will be located on stable surfaces where they will not be <br />disturbed by the mining operation. In the unlikely event this topsoil stockpile remains in <br />place for more than ninety days it will be seeded as soon as practical and berms will be <br />constructed around the base of stockpiles where necessary to prevent loss of topsoil <br />material from the stockpiles. <br />TR -69 14-35 12/16 <br />
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