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HomeMy WebLinkAboutSite Utility StudySITE UTILITY REPORT FOR THE ELLIPSE 1776 BISCAYNE BLVD. REDEVELOPMENT CITY OF MIAMI, FLORIDA SHAH, DROTOS AND ASSOCIATES 3410 N. Andrews Ave. Ext. Pompano Beach, FL, 33064 (954) 943-9433 SDA Project No. 0668A.04 `-.; = SHAH DROTOS &A S S O C I AT ES • • • Site Utility Report Project No. 0666A.00 October 25, 2004 Page 2 of 5 pages INTRODUCTION This report will present the results of an investigation into the site utility availability and development requirements for a 1.91 acre parcel of land located within the City of Miami, Florida. The parcel is rectangular in shape and is bounded on the north by NE 18th St., on the west by N.E. 2" Ct., on the south by N.E. 17th Terrace and on the east by Biscayne Blvd.. The proposed development consists of the construction of a mixed use residential / retail tower consisting of approximately 267 rental apartments and approximately 9,000 Square feet of retail use. The height of the building will be approximately 275 feet above grade. EXISTING CONDITIONS The site is currently occupied by a bank building with drive through and asphalt and concrete parking areas. There are also open green space areas with a number of mature trees on the site. Existing sanitary sewer and drainage manholes indicate underground lines which must be removed for the proposed project. WATER SUPPLY An existing 16" water main is located along the east property line in Biscayne Blvd.. A 2" water main is located in N.E. 17'h Terrace along the south property line. A 6"water main is located on the north side of N.E. 1.8t'' St. along the north property line and a 4" water main is located on the west side of N.E. 2" court. The proposed development will result in a projected domestic water demand of approximately 60,000 gallons per day. The existing water mains are of sufficient capacity to service the domestic water demands of the proposed site. However, the Miami Dade Water and Sewer Department (MDWASD) has indicated that replacement of the existing 2" water main with a 12" water main will be required along NE 17th Terrace extending from Biscayne .Blvd. to N.E. 2" d Court. • • Site Utility Report Project No. 0666A.00 October 25, 2004 Page 3 of 5 pages This new water main will meet the projected demand for both domestic and fireflow requirements. SANITARY SEWER Sanitary sewer lines are located within NE 181h St., NE 17th Terrace and Biscayne Blvd.. These lines are 10" in diameter and are of sufficient capacity to service the site. The site will be served by Miami Dade pump station number 30-002. The station currently has sufficient capacity for the proposed development. Construction will include the replacement of the existing sanitary sewer service laterals currently serving the site. MDWASD staff has confirmed that adequate water and sewer treatment plant capacity is available for this project. STORM WATER MANAGEMENT The City of Miami has confirmed that there will be no drainage outfall available for the proposed project to the city's rights of way. All rainfall must be retained on -site. This will be accomplished through the use of drainage wells and underground exfiltration trench. The proximity of this site to tidal waters will allow for the use of drainage wells to provide for on -site discharge of the required water quantity. The wells will consist of an underground detention structure to provide a minimum 90 second detention of runoff prior to discharge to the wells. The wells will consist of a 24" diameter steel casing extending to a depth beyond the underground source of drinking water in accordance with the requirements of the Florida Department of Environmental Protection. Pretreatment of runoff will also be required prior to discharge to the wells. This will be accomplished through the use of underground exfiltration trenches. Calculations for the estimated drainage well requirements based on runoff from the 5 year, 1 hour storm event are as follows: • • Site Utility Report Project No. 0666A.00 October 25, 2004 Page 4 of 5 pages Well Capacity Total land area excluding building wall.... 1.91 acres Building width... 340 ft Building height.. 275 ft Exposure factor.. 33% Additional building wall impervious 0.71 acres Total land area including building wall 2.62 acres "A" Impervious area (including building) 2.15 acres Pervious area 0.47 acres Weighted C Value 0.76 "C" 5 year 1 hour storm Time of Concentration Intensity 5 minutes 8.00 inches "I" Total Runoff Q=CIA 15.83 cfs. Water table elev. 1.50 ngvd Min. inlet elev. 7.00 ngvd Design head elevation 5.50 ngvd Available head = overflow elevation - water table - 1 ft (to account for salinity) Typical well flow results are 1000 gpm per ft. of head for 24" diameter wells drilled to a depth of 80 to 100 feet. Using 3.0 ft of head X 1000.00 gpm provides 3000 gpm well capacity, however the maximum practical capacity of a well is 2500 gpm. The number of wells required to discharge the peak flow from the 5 yr 1 hour storm is 2.84. After including the discharge from the exfiltration trench, it is anticipated that 2 wells will be required for this site. Capacity of the wells for the first hour of discharge is 0.92 acre feet which exceeds the required detention volume. Detention Tank Capacity Runoff from parking areas 1.7 cfs Width of detention structure .. 6 feet Top of structure elevation 5.50 ngvd Bottom of structure elevation -1.00 ngvd Length required for 90 second detention 4.5 ft • • • Site Utility Report Project No. 0666A.00 October 25, 2004 Page 5 of 5 pages SOLID WASTE Solid waste generated by this project will be collected in the trash room located in the parking garage. Solid waste and recyclables will be collected by a private waste hauler or the City of Miami. The estimated solid waste generation of the proposed building is as follows: Residential -- 267 units x 8 lbs/unit/day = 2,136 lbs/day Commercial -- 9,000 sq. ft. x 40 lbs/1000 sq. ft./day = 360 lbs/day Total estimated waste generation 2,496 lbs. /day DRY UTILITIES Electric, telephone and cable TV are currently available to the site. Final service requirements will be coordinated with the utility providers.