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Mr.Lennberg <br /> April 15,2019 <br /> Page 3 of 4 <br /> PLS Response: The ponds are planned to remain in place, however if relocated they would be <br /> the same size per the allowed SWSP. <br /> 7.What are the dimensions of the existing ponds at the site; length,width and depth? <br /> PLS Response: Please note the following dimensions are of the excavated area and not to be <br /> used in determining exposed pond surface area, due to slopes and depth to water surface. As <br /> such the western pond is 132' x 267',the northeastern pond is 325'x 238',the southern pond <br /> is 86'x 400'and the southeastern pond is 176'x 89'. The average depth of the excavated areas <br /> is 22 feet. <br /> 8. In the event that there is a flood that inundates the cell during active mining, being located <br /> within the 100-year floodplain, how will you ensure that captured water is returned to the natural <br /> drainage system within 72 hours? <br /> PLS Response: PLS will ensure captured water is returned via pumping to the channel leading <br /> to the Arkansas River, breaching the slurry wall to allow captured water a hydraulic passage to <br /> the surrounding groundwater,or a combination of both. <br /> 9. After mining and backfilling is completed is there a risk of the cell being saturated through <br /> flooding and creating a localized area of saturation that cannot be drained and thus affecting the <br /> hydrologic balance at the site? Has the Operator considered breaching the slurry wall after the <br /> cell is mined out in order to maintain the prevailing hydrologic balance at the site? <br /> PLS Response: The slurry wall will be breached in areas that will not be used in possible future <br /> slurry wall cells (i.e. south wall). This will allow for a hydrologic balance with the surrounding <br /> groundwater and to ensure no water storage occurs within the cell. <br /> 10.At this time the Division is not requiring submittal of the slurry wall construction specifications <br /> but in the event that the proposed cell southern wall gets incorporated into the adjacent final <br /> water resources pond the Division will require those specifications as well as QA/QC <br /> documentation associated with its construction. <br /> PLS Response: PLS understands and will collect the necessary information in case the described <br /> future permit action occurs. <br /> 11.As a part of the review of TR-02,the Division will evaluate the financial warranty to determine <br /> the cost of reclamation for this phase of the mining operation. Reclamation of the phase will be <br /> accomplished by backfilling the cell to approximate original grade. All information necessary to <br /> calculate the costs of reclamation must be submitted and broken down into the various phases <br /> of reclamation as required by Rule 6.4.12. Please include with the provided information the <br />