Agenda - Council - 06/28/2005 - Laserfiche WebLink

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o -316- Preliminary Plat and Preliminary Site Plan Review: Ramsey Town Center 10th Addition May 27, 2005 Revised: dune 24, 2005 Page 3 of 7 the infiltration basins or by installing water quality treatment devices at the points' where stormwater leaves the site. Each house pad must be labeled with the following information: House style, garage elevation, £u'st floor elevation, lowest floor elevation, walkout or lookout elevation. The back yards are a series of depressions with catch basins. The water will build up to 875.5 before it cart flow overland and leave the depressions. Lookout openings are proposed as low as 871.25. Lowest floor elevations are proposed below the adjacent catch basin rim elevations. Lots 6, 7, 29, 32, and 36, Block 1 do not have lookout elevations shown, though the grading indicates it could be a lookout lot. Drainage and utility easements are required over the backyard swales. The 100-year high water elevation of alt detention areas must be shown and .the lowest openings in the adjacent houses must be 2 feet above .t~he emergency overflow for the detention area. A drainage and utility easement over the 100-year elevation is needed on the north side of the plat. Additionally, easements will need to be acquired along the south line of Greenland Hills in order to construct the plans as shown. The proposed plans block the existing drainage from these back yards; Drainage will need to-be provided. Lots 1-6 of Block 2 are within an area shown as a permanent wetland on the LRRWMO wetland permit. These lots cannot be platted unless the wetland permit is amended and approved by the LRRWMO. A treatment basin is required prior to discharge into the Western wetland. The Developer is also responsible for increased runoff as a result of the AUAR roadway improvements to Bunker Lake Blvd. Stormwater Analysis: The latest SWMM model shows an increase of 3.0 acre feet in the West Park pond. The pipe from the 8th, 9th, and l0th Additions is upsized to pass the 100-year event from these projects to the West Park pond. The change in pond level is approximately 0.1 feet. Utilities: This subdivision will be served by sanitary sewer and city water services that will be extended into the development. The following sheet specific comments must be addressed: Continuation references and sheet overlap must be provided as discussed on previous projects. These plans are the basis for the city as-built records that will be maintained for future reference on utility connections. Water, sanitary sewer and storm sewer will need to be extended from south of Bunker Lake Boulevard to serve this project. The storm sewer under Bunker Lake Blvd at Armstrong Blvd will need to be lowered to serve the wetland. The pipe in the rear yards is shown as FiDPE; pipe in drainage and utility easements must be RCP. The utilities south of Bunker Lake Boulevard were included in the propoked assessments of the Master Development