Laserfiche WebLink
Page 5 <br /> Mr. Eric Scott <br /> June 4th, 2021 <br /> issues have been resolved. Equipment is listed on the Exhibit L Spreadsheet. <br /> EXHIBIT S-Permanent Man-Made Structures(Rule 6.4.19): <br /> •As previously stated, the unlined slopes of the freshwater and siltation pond are shown on the modified <br /> mining plan map as 1:1, however, the submitted geotechnical stability exhibit provides analysis of 2:1 <br /> slopes for all excavations, and only in three locations for the entire site. Please either re-run the stability <br /> model to demonstrate adequate setbacks for the freshwater and siltation pond at a 1:1 slope and at the <br /> maximum projected depths, or modify the mining plan map to reflect 2:1 slopes for these excavations as <br /> described in the current stability exhibit. The freshwater and siltation pond will be wet mined at a 3:1 <br /> slope instead of the 1:1 slope shown previously.The Mining Plan Map has been updated to reflect <br /> this change(see attached Mining Plan Map) <br /> •Please also describe in detail how it was determined that only 3 sections would be needed to provide <br /> adequate stability setback data for all structures within and within 200'of the permit area, and how those <br /> sections were selected. Additional analysis may be required for structures currently shown to be within <br /> mining cells as shown in the submitted revised maps. For the siltation and freshwater ponds,the closest <br /> structure is a gas line that runs along the western edge of the property.The deepest section of the <br /> siltation pond was chosen for the model as this represents the worst case scenario for each of these <br /> ponds. <br /> The closest structure in the slurry wall lined cells is the slurry wall itself.The deepest section along <br /> each slurry wall was chosen to represent the worst case scenario for the closest structure. Since all <br /> other structures within 200'of the permit boundary are either further away from the mine limit, have <br /> a shallower depth to bedrock or both,the mine highwall would be more stable than the worst case <br /> scenarios modeled. <br /> Please feel free to contact me with any questions or concerns. <br /> CIVIL RESOURCES, LLC <br /> Kyle Regan <br /> Project Geologist <br /> J:1Brannan\Nix\DRMS-AMENDMENT1Adequacy Review\Adq-1-2001-046_AMO1.doc <br />