Agenda - Council - 02/27/2018 - Laserfiche WebLink

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• A portion of the lot located in the northeast quadrant of Xenolith Street and Sunwood Drive will be connected to the Sunwood Drive storm sewer system. A storm sewer system was previously constructed in Sunwood Drive and Center Street. The system directed roadway runoff to regional ponds located to the east and south of the study area. Approximately 400 feet of Sunwood Drive located west of Center Street flows to the east. The remainder of Sunwood Drive adjacent to the study area flows to the south in a pipe located at the Yolite Street alignment. As described, the majority of the drainage for the study area is planned to flow north from Sunwood Drive and west from Center Street to a regional pond located north of Ramsey Parkway and west of Center Street. The outlet for the regional pond currently discharges to an open area located on the south side of the future Ramsey Parkway. The storm water then flows overland to a pipe near the Sunwood Drive and Yolite Street intersection. The pond outlet is anticipated to ultimately include a discharge pipe from the regional pond to the Sunwood Drive storm sewer. This pipe will most likely be extended along the future Yolite Street. The final configuration of the regional pond, and associated pond volume, is being developed concurrently with proposed park improvements being planned for that area of The COR. The pond configuration depicted in the exhibits is based primarily on preliminary park sketches. No cost estimating was performed related to construction of the pond for this analysis. Along with the final pond configuration, proposed construction methodologies are currently being considered by the City. VI. ADDITIONAL ANALYSIS As a portion of this analysis, we reviewed City Comprehensive Plans for sanitary sewer and water main needs for the study area and completed a rough site grading review of the City park area. The following is a summary of results for the various analyses and reviews. Sanitary Sewer and Water Main The segment of trunk sanitary sewer main following the currently platted Ramsey Parkway does not follow the revised 2012 master plan alignment. This main may need to be realigned when this segment of Ramsey Parkway is constructed. An 8-inch gravity sanitary sewer main will be adequate to convey flows from the area. For this analysis, we included an allowance for 8-inch service lines to be extended to properties along the corridor. Ramsey Parkway includes a 12 inch watermain, which completes an east -west trunk system through The COR. All existing streets include provisions to extend 8-inch watermain into the study area. Future roadway construction (other than Ramsey Parkway) should include 8-inch watermain to complete looping in the study area. In the case that a high water user plans to develop within the project area, additional flow analysis should be performed to verify they will have adequate flow and pressure for their individual needs. Figure 6 in Appendix B depicts sanitary sewer and Figure 7 depicts the water main improvements within the study area. Prepared by: Bolton & Menk, Inc. Center Street Area Analysis I R16.114929 COST ALLOCATION ALTERNATIVES Page 6