PERMFILE121579 - Laserfiche WebLink

Home Browse Search

5. the responses provided on source of clay for the liner (5a) and construction method (5b) are adequate. The response to design specifications (5 c) and (5d) state that these will be provided when complete. The Division requests that qou commit to providing these designs to MLRD 60 days prior to disturbance of the site. 6. phis question requested information on the dike separating the two reservoirs. The response was to revise the reclamation plan to remove the berm and instead propose one large waterbody. This change presents new concerns as to the stability of this configuration during flood conditions. the operation is located approximately 1 mile downstream from Baseline Road, which is the boundary of the Urban Drainage and Flood Control District. As such, a potential exists for impact to UDFCD facilities. the UDFCD should be contacted for comment. A review of the revised proposal indicates that it does not meet UDFCD guidelines for spacing of lateral berms, length of side-channel spillways and spillway riprap design. The original proposal for two lakes did appear to conform to UDFCD guidelines with the exception of the outlet spillway. The Division recommends the applicant revise the new proposal to be consistent with UDFCD guidelines or reconsider the original proposal as previously submitted. We feel that the UDFCD guidelines are indicative of prudent engineering practices, and provide standards which should be incorporated into plans for alluvial gravel operations. By incorporating these practices, an operator allows the Division a certain level of comfort in making a determination that the proposed operation will minimize impacts to the hydrologic balance and off-site damage, two findings which are essential to permit approval. If you select to pursue the "one reservoir" alternative, please address the following new issues which are raised: a. This new configuration increases the potential for shoreline erosion and is less stable from a hydrologic standpoint, increasing the probability of failure during a flood. It also provides less enhancement to wildlife habitat upon canpletion of reclamation. Please address these issues. b. Please quantify and discuss the increased water consumption resulting from the increase in reservoir surface area, and augmentation of the same. c. What will be done with the overburden which was to be used to construct the dike? d. What will the water level in the reservoir be? Assuming that the downstream topography controls the water surface elevation, there will be a great deal more upstream area which will be above the high water line and will need revegetation. Please address how this impacts the reclamation plan and your reclamation cost estimates.