7.7. SR 12-18-1995 - Laserfiche WebLink

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Weatherwood Subdivision Final Plat December 18, 1995 Page 2 • As part of the street construction to serve the lots in this plat, approximately .32 acres of wetlands will be filled and mitigated elsewhere within the plat. This mitigation plan was approved by the City Council on October 2, 1995 with four conditions. The outstanding conditions have been included as part of the conditions for final plat approval. Final Plat Review The final plat's number of lots, lot configuration and street design has been prepared in accordance with the preliminary plat as approved by the City Council. However, the final plat has not included several drainage and utility easements to cover existing wetlands or new drainage treatment ponds as illustrated on the grading plan. These drainage and utility easements will need to be included on the final plat prior to releasing the plat for recording. Drainage and Utility Plan One of the conditions of preliminary plat approval was for the developer to submit a grading and drainage plan for review and approval. Along with that plan, appropriate drainage calculations were supposed to be submitted. iWithout these calculations staff is unable to accurately determine if the proposed treatment ponds are adequately sized to accommodate the drainage generated by the proposed plat design. The concern with not having these drainage calculations and an accurate drainage plan at this point is if any of the illustrated treatment ponds have to be expanded to handle additional capacity, the ponding area may infringe upon the developability of the proposed lot. The one lot that has concerned staff all along is Lot 3, Block 3, located at the southeast corner of 199th Avenue and Troy Street. If the treatment pond illustrated on that lot needs to be increased, it may further complicate the placement of two septic systems as well as a building pad for the proposed home. Staff is recommending that the appropriate drainage calculations and grading plan be finalized and approved prior to recording the plat. One additional concern is the steepness of the grade that may occur immediately outside of the right -of -way with the installation of the streets. Some of the street grades are 6 -8 feet higher than the surrounding property. In one instance, a wetland is immediately adjacent to the right -of -way which may need to be filled more than originally anticipated. Once again, in order to maintain proper slopes away from the right -of -way that will not cause a safety hazard, necessary changes in the grading plan may have some impacts on the overall plat. Staff believes additional information will be necessary to s:counci1:p95 -1