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HomeMy WebLinkAboutTab 3 Site Utility Study• FIVE PROP H RTII4, S LLC NW 43 Avenue & 9TH Street, Miami SITE UTILITY STUDY • Prepared by: D.EVELOTEC, IBC. 3737 SW 8 STREET, SUITE 400 Coral Gables, Florida 33134 Tel. (305) 441-6916 Fax. (305) 441-6976 • May, 2005 • 1- INTRODUCTION The location of the proposed project is a complete block bounded by NW 9`h to 10t1' Streets and NW 43rd Avenue to 43rd Court, in Miami. This site is 60, 782 square feet, or approximately 1.4 acres (see exhibit 1). The site currently contains 56 units that will be demolished. The improvements will include a 7-story residential tower consisting of both parking and residential units in east side and residential units in the west side. There will be a total of 158 units in the building. • 11 WATER DISTRIBUTION The Miami Dade Water and Sewer Department (WASD) provides water service in this area. There are existing 8 inch water mains in NW 43rd Avenue and in NW 9th Street; there is also a 4 inch water main in NW 10th Street abutting the frontages of the property. There is no water main in NW 43rd Court (see attached WASD atlas sheet labeled exhibit 2). Due to the limited time available for this study, we can assume that WASD will require the replacement of the 4 inch main in 10th Street and perhaps install a new main in NW 43rd court from 9th to 10th Streets. If fire low tests fail, a new 12 inch main will be required to connect to an existing 24 inch water main. in NW 45th Avenue and NW 9dt Street, and brought to the project. WASD has indicated that this project must be taken to the Infill Committee once the fire flow tests are performed; this will take several weeks. Based on applicable standards of 200 gpd per unit, the anticipated average water consumption of this project will be 31, 600 gallons per day (gpd). Credits will be given for the existing units that will be taken down (11,200 gpd) for a net impact of 20,400 gpd. • • • • SANITARY SEWAGE COLLECTION The Miami Dade Water and Sewer Department (WASD), also provides the sanitary sewer service in this area. There is an existing 21 inch gravity sewer main in NW 9;h Street, an existing 18 inch gravity sewer main in NW 43rd Avenue, and an existing 10 inch gravity sewer main n NW 10th Street. There are also 12 inch force mains in both 9th Street and 43rd Avenue. It is anticipated that connection to will be permitted by WASD, however, during the permitting process, WASD will analyze the capacity in the line as well as any proposed future flows and may require improvements or contributions in lieu of actual construction of improvements. WASD pump station No. 112 serves the area, and has projected operating hours of 9.12 hours per day based on current conditions and approved projected flows. The additional estimated average sewage flow of 20,400 gpd (158 minus 56 units at 200 gpd per unit), plus other future projects in the basin may bring the station to exceed 10 hours per day, which is the maximum hours prior to the non-compliance threshold (see exhibits 4 and 5). it is recommended that negotiations with WASD are established as soon as density is secured in order to deteririine what improvements will be required as well as their timing and cost. The Virginia Key Sewage Treatment Plant receives and treats sewer from this area. Iv- DRAINAGE SYSTEM We have considered the entire site impervious for drainage calculation purposes. The green areas provided, will not be considered in the calculations in order to provide a conservative stoz ru management design. Stormwater discharge will consist of runoff from rooftops, parking areas, driveways, vertical building faces and pedestrian areas. Miami -Dade requires that the proposed drainage system take into account 1/3 of the largest vertical building face. We have chosen the building faces exposed to the east to produce the largest amount of runoff and will be accounted for in the calculations and is summarized as follows: • • • Total Net Impervious Vertical Total Lot Area Area Building Faces Drainage Area (acres) (acres) (acres) (acres) 1.4 1.4 0.15 1.55 The proposed drainage design will show for all pavement runoff to be collected in catch basins capable of detaining the peak flow from the Miami - Dade County DERM 5-year, 24-hour design stouui for 90 seconds. These basins will also contain baffles to prevent all oil, grease and any foreign matter from flowing into the new system. Runoff from building rooftops and vertical faces are uncontaminated by oil and grease and may be run directly into the drainage system. Exfiltration trenches system will be designed in the perimeter of the building, if the calculations show a greater need for storage and disposal, a drainage well(s) will be designed to mitigate that condition. The use of drainage wells is permitted by Dade County DERM in this area due to the high level of salinity found in the groundwater. The proposed exfiltration trench and/or drainage well systems will keep the site dry during the DERM 5-year/24-hour storm. V- SOLID WASTE GENERATION Solid waste shall be placed in standard containers for refuse and recyclables that shall be on site and comply with the City of Miami Code, for regular pickup by private hauling companies and/or the City of Miami Solid Waste Department and shall be transported to Miami Dade's Disposal Facilities. Actual waste pick-up location(s) will be shown in the architectural plans. This project is anticipated that solid waste will generate 790 pounds per day (lbs/day) at the rate of 5 lbs/day, times 158 units or 0.4 tons per day.