Agenda - Council - 05/27/2003 - Laserfiche WebLink

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-150- Response. A follow-up report on the design details of the County-owned outlet route south of TH 10 has been prepared, and will be added as Appendix J in the revised AUAR. The report will be presented to the County Public Works and Parks Committees in early June. If these Committees agree that the route can be used, a recommendation will go to the County Board for action. Negotiations for development of the con'idor for drainage and parks use would then begin in earnest among the County, City and RTC developer. If the County-owned route is not allowed, alternative routes will need to be purs'ued. The draft AUAR did not specify a route, other than a'suggestion that the current route southeastward along TH 10 could be pursued (Item 17, Runoff Under Developed Conditions). This discussion is expanded in the AUAR revision to identify two possible outlets, in addition to the TH 10 route. The Rivenwick Development to the southeast of the RTC site and the Alpaca Development to the southwest both have small outlet pipes draining the immediate developments. Discussions with the City and its consultant engineer have identified these as two possible connections between RTC and the River. Details on these two connections will be evaluated if discussions with the County on the original outlet do not lead to County approval to use the route. Comment #4. In response to changes made in Item 18 requested by MCES, Bolton & Me~¢, Inc. (David Martini) reviewed the Item and Appendix G on behalf of the City of Ramsey and submitted 10 comments. Response. The following responses were prepared for the City: Comment 4.1: Section 1Bb. Paragraph 2 - The Sewer plan refers to an available capacity in the downstream facilities of 2.8 MGD. 7.87 MGD is the ultimate flow at full build out shown in the (1991) Comprehensive Sewer Plan and is the flow that has been used to design the existing system. Response: Paragraph 2 of Section 18.b has been modified as follows: The City's Comprehensive Plan documented MCES Projected Wastewater flows for the City of Ramsey to be between 542 and 668 MGY or a maximum of 1.8 MGD. The Sewer Plan indicated that at full build out, including Rural Areas, 7.87 MGD of flow would be generated. The MCES interceptors and the City's collection system have been designed for this ultimate flow at full build-out. However, because of bottlenecks in the MCES system downstream of Ramsey, maximum average daily flows are currently limited to an allocation of approximately 3.8 MGD. Therefore, it appears the existing collection system is sized to handle the flows projected in this report. Comment 4.2: Section 18b. Paragraph 3 - I am not sure if2.8 MGD is 30% of the capacity at the Anoka lift station. The Comprehensive Sewer Plan states that 2.8 MGD is approximately 35% of the ultimate flow at full build out. 34-2 I I i I I I I I I I I I