5901 HIGHWAY PL WHOLE SITE 2019-06-04

I. Project Description: The project site is located in the Combined drainage basin and is situated east of Highway Place. Development would encompass the entire 0.6313 acre site with improvements consisting mainly of paving and buildings with landscaping around the perimeter and landscape in along the frontage. The proposed project would develop the site into multi-family residences with the main frontage along Highway Place.Development will occur in one phase.Developed impervious/pervious area will be 0.4393 acre and 0.1920 acre,respectively.The following pervious and impervious areas are anticipated for the site: Developed impervious area—roof 0.2548 acre Developed impervious area—pavement 0.1515 acre Developed impervious area—Walkway 0.0330 acre Developed pervious area-landscape 0.1920 acre The property south and east of the site appear to contribute a minor amount of stormwater runoff to the site.No identifiable watercourses were observed crossing the site. Erosion control for the site will consist of filter fabric fences situated on the downhill perimeter boundary of the site and by the installation of a rock construction entrance. Catch basin sediment control will be installed for all existing catch basins within the project limits and downstream in the vicinity of the project.The stormwater runoff from paved surfaces will be directed to a detention tank by a catch basin conveyance system. The site will be graded to sheet flow the runoff to the catch basins that will discharge to the detention tank. Roof runoff will be tightlined to the storm drain system. The detention tank will discharge to an existing storm drain system installed along the west side of Highway. The proposed conveyance system runs north and south and is 8-feet from face of curb to avoid a 30-inch water main running along the gutter line of the proposed street improvements.