Laserfiche WebLink
• Final Site Stabilization <br /> Regarding the alluvial fill excavation, Cotter will undertake this activity in two sub- <br /> phases. First, Cotter will excavate the southernmost zones (4 and 7, as shown on the <br /> attached map), and then will excavate the northern remaining zones. The total area for <br /> the southernmost zones is 2.1 acres. The total area of the remaining northern zones is 5.9 <br /> acres. <br /> Comment No. 8 - The construction schedule for the removal of alluvial fill provided under <br /> Amendment No. 4 must be updated. As required by Rule 6.4.21(1 5)(a),provide a detailed <br /> construction schedule for the removal of alluvial fill. The construction schedule may be <br /> incorporated with the reclamation schedule discussed in Item No. 7. <br /> Response: The requested construction schedule is incorporated into the schedule <br /> presented in responses to Comment No. 7. <br /> Comment No. 9 - Excavation of the alluvial fill will occur over several construction seasons. <br /> Please clarify if the excavation and placement of the alluvial fill onto the WRPs will occur <br /> throughout the entire year. If there will be periods of inactivity during the winter months,then <br /> describe how the WRPs will be temporarily stabilized. <br /> Response: The reclamation schedule is for a period of 15 months;therefore, this project <br /> will span two construction seasons. The break is expected to be from late December <br /> 2017 into April 2018. Prior to the break, any WRP being utilized will be compacted, and <br /> an interim cap will be placed on the slopes and top surface. This interim cap will consist <br /> of topsoil and mulch as described in the response to Comment No. 6. If possible, Cotter <br /> will also seed the slopes using the regular upland seed mix shown in the response to <br /> Comment No. 17 plus 8 pounds per acre of QuickGuard Sterile Triticale (Triticum <br /> aestivum x Secale cereal). The QuickGuard will establish quickly. For mulch, Cotter <br /> will either use straw or coir erosion control blanket. <br /> Following the break, reclamation will restart and the excavation waste will be placed over <br /> the interim vegetated cap; excavation will be completed and a new vegetated cap will be <br /> placed over the newly placed excavation waste. <br /> Comment No. 10 - The excavation of alluvial fill may impact the alluvial groundwater capture <br /> system and could result in the removal of a monitoring well or sump. Please commit to <br /> notifying the Division within 30 days of the removal, decommissioning, relocation or <br /> modification of any monitoring wells or sumps. Changes to the location of monitoring wells <br /> and sumps may require the submittal of a Technical Revision to update the groundwater <br /> monitoring plan. <br /> Response: Cotter will notify the Division within 30 days of the removal, <br /> decommissioning, relocation or modification of any monitoring wells or sumps. <br /> Comment No. 11 - Please describe what measures will be taken to address the seasonal <br /> 2016-11-07 Response to TR23 Adequacy Review 4 <br />