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HomeMy WebLinkAboutMOUNTAINRIDGE FARM PUD PRELIMINARY - 18 92 - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTSUtlillity ices Stormwafi City of Fort Collins March 13, 1992 Mr. Peter Kast G.T. Land Colorado Inc. Stanford Plaza Suite 100 3555 Stanford Road Fort Collins, Colorado 80525 Re: Mountainridge Overall Development Plan Dear Peter: I wanted to follow up on our meeting yesterday regarding the submittal and review process for the First Filing of Mountainridge. There appears to be some confusion about what needs to be submitted for the Stormwater Utility's review and when it needs to be submitted. As you know, there are several proposed regional drainage improvements located on the Mountainridge site including, two regional detention ponds, a channel connecting the two ponds, a drainage crossing of the Pleasant Valley and Lake Canal, and a box culvert crossing under Shields Street. A short reach of regional channel downstream of the Shields crossing is also needed to tie into the existing regional channel in Four Seasons. The need for the regional detention ponds was identified after the City revised the hydrology for the McClellands/Mail Creek Master Plan and realized that downstream facilities proposed in the master plan were inadequate to carry developed flows from west of Shields Street. The City identified the amount of volume needed and proposed two possible detention ponds. However, due to other priorities and the lack of development activity in this area, final alternatives and cost estimates were not prepared nor the revisions finalized. Since these ponds are not shown in the approved McClellands/Mail Creek Master Plan it is necessary to officially revise the Master Plan so that the regional facilities can be paid for using Utility funds. The Master Plan revisions can be approved by the Utility Services Director and do not need Council approval. Because the Mountainridge area is now beginning to develop it is necessary to finalize the revisions to the Master Plan so that the area can develop in such a way as to incorporate the regional drainage facilities and allow development to occur in a timely way. If the submittals are complete and the Preliminary and Final Review processes followed we don't think this process will hold up the 235 Mathews - P.O. Box 580 - Fort Collins, CO 80522-0580 (303) 221-6589 Y FAX (303) 221-6239 development of the property, particularly the First Filing located adjacent to Shields Street. To ensure a smooth process the following items should be submitted at each stage of the review. 1. Prior to Preliminary Submittal (should be done immediately) Submit a scope of work and cost estimate from the design engineer identifying the design tasks associated with the McClellands/Mail Creek Master Plan revisions and final design of the regional drainage facilities to be built with the First Filing. The cost identified in this scope will be reimbursed by the City under the Developer Repayment Program. This item has been discussed with RBD but nothing has been finalized. 2. Preliminary Submittal Submit a Conceptual Overall Drainage Plan for the Mountainridge site that addresses how the entire site will drain, how offsite flows will be routed through the site to the regional detention ponds, and where the regional drainage facilities will be located. Overall Drainage Plans are typically prepared for Overall Development Plans to ensure that major drainage issues are identified and that future filings conform to the Overall Drainage Plan. These plans are fairly conceptual in nature, no final design is necessary. Submit a Preliminary Drainage Report and a Grading/Erosion Control Plan for the First Filing. The requirements for the report and plan are documented in our drainage criteria. Again, final design is not necessary. The purpose of Preliminary is to identify major drainage issues before a lot of work has been done towards final design. Submit the preliminary design alternatives for the regional drainage improvements, including the two ponds, the crossing under Shields Street, the channel connecting the two ponds, and the channel downstream of Shields Street. The main purpose of this analysis is to ensure that the correct volumes can be obtained in the regional ponds so that we can proceed with final design of the pond adjacent to Shields Street, the crossing of Shields .Street and the downstream channel. All of this work will have been identified in the original scope of work submitted by the design engineer. (Item #1 above) If the submittal is complete and revisions completed the Preliminary submittal should be approved in a timely fashion. As part of the Preliminary approval the Utility will identify which regional drainage alternative the design consultant should take to final design. Once the Preliminary approval is complete the Utility will also submit the proposed McClellands/Mail Creek Master Plan revisions to the Utility Services Director and the Drainage Board for approval. 3 However, the design engineer will be able to proceed on to final design while the revisions are being approved. Final Submittal Submit a final drainage report and a grading/erosion control plan for the First Filing. This is a detailed analysis of the site that shows exactly how the site will drain and what facilities must be built. The requirements are detailed in our Drainage Criteria. Submit final design calculations and drawings for the regional detention pond adjacent to Shields Street, the box culvert crossing under Shields, and the channel downstream of Shields Street. The drawings may be included in the utility plans for the First Filing. Submit an Exhibit B that documents the final cost estimates for the City's portion of the regional drainage facilities. This exhibit must be included in the Development Agreement. It is not necessary to complete a final design for the remaining regional drainage facilities on the site. This can be done as subsequent filings are done. If the final submittal is complete and the revisions completed, the final approval should occur in a timely fashion. The preliminary analysis of the Master Plan revisions will identify where ponds can be physically located but it won't need to go into such details as the actual crossing alternatives for the Pleasant Valley and Lake Canal. Since this issue will eventually need to be addressed, the Utility would continue on with the analysis of the regional facilities upstream of the First Filing so that as subsequent filings are submitted only the final design of the regional facilities will be needed. However, this further analysis can occur after the final approval of the First Filing. The requirements outlined here do not take into account any changes that may occur due to the requirements of other City departments. Therefore our requirements may change based on additional information obtained during the review process. I hope this clarifies the expectations of the Stormwater Utility. It is very important that the scope of work for the proposed Master Plan revisions be submitted as soon as possible so that we can approve it and provide direction to the design engineer prior to the Preliminary submittal. I would suggest throughout the preparation of the submittal of preliminary and final plans that periodic coordination meetings take place between the City and the consultant to help identify issues as soon as possible to avoid unnecessary delays and expenditures. . • i If you have any questions or need areas clarified please feel free to call me at 221-6589. We look forward to working with you on this project and seeing it through to completion. Sincer ly, Bo Smith Stormwater Utility Manager cc: Greg Byrne, Director of Community Planning and Environmental Services Rich Shannon, Utilities Director ibke Herszrig;) Engineering Ted Shepard; Planning Steve Hair, Community Construction, Inc. Eldon Ward, Cityscape Stan Myers, RBD, Inc.