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HomeMy WebLinkAboutO. Site Utility Study,= CALLE OCHO MIXED-USE DEVELOPMENT 504 SW 8TH STREET MIAMI, FL 33136 Site Utility Study CTE Project No.. D7-0315-40 Prepared by: ConsulTech DEVELOPMENT SERVICES, INC. Florida Certificate of Authorization No. 9008 10570 N.W. 27th Street, Suite 101 Miami, Florida 33172 Tei. 305-599-3141 Fax. 305599-3143 March 2007 f CA -ell" '// Juan C. niz, P.E. Reg. Eng'neer No.S 984 State of Florida r— I. INTRODUCTION The purpose of this report is to identify the location of exiting water and sewer main lines adjacent to the project site which are available to serve the new Calle Ocho Mixed -Use Development project and to estimate the general water, sewer, and drainage requirements as well as calculating the expected solid waste generation for the proposed development. The proposed project site is located at the northwest block of the intersection of SW 9th Street and SW 5fh Avenue. The site is bound by SW 5t" Avenue (east), SW 9th Street, (south), SW 8"' Street (north), and adjacent properties to the west. In total, the project site is made up of nine separate lots (Folio Numbers: 01-0206-010-1010, 01-0206-010-1180, 01-0206-010-1171, 01-0206-010-11701 OI - 0206 -010-1160, 01-0206-010-1150, 01-0206-010-1140, 01-0206-010-1130, and 01-0206-010-1120). The existing buildings and parking lot which occupy these properties will be demolished in order to make way for the new development. The proposed project will include a mixed use development residential tower with a parking garage, commercial and retail space. The project will have a total of 229 residential units, approximately 20,946 SF of commercial space, and approximately 20,173 SF of office space. II. DRAINAGE SYSTEM For drainage design purposes, the site will be considered 100% impervious. Landscape and green areas are provided, but these areas will not be considered in the calculations in an effort to be conservative in the storm water management design. Storm water discharge will consist of runoff from rooftops, driveways, vertical building faces and pedestrian areas. Miami -Dade DE RM requires that the proposed drainage system take into account 113 of the largest vertical building face. The building face exposed to the north will produce the largest amounts of runoff and will be accounted for in the calculations. The site land use can be summarized as follows: Calle Ocho Total Net Impervious Vertical Lot Area Area Building Faces Acres Acres (33%) Acres 2.34 2.34 0.30 1 Total Drainage Area Acres 2.64 ConsulTech Development Services, Inc. All pavement runoff is to be collected in catch basins capable of detaining the peak inflow from the Miami -Dade County Department of Environmental Resources (DERM) 5 -year, 24-hour design storm for 90 seconds. These catch basins also contain baffles to prevent all oil, grease and foreign matter from flowing into the proposed drainage system. The runoff will then flow into four proposed drainage wells based on calculations found in Table 1 (See Page 5). Runoff from building rooftops and vertical faces are uncontaminated by oil and grease and may be conveyed directly into to the drainage wells. 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. Since the proposed system is using drainage wells to dispose of excess runoff, an exfiltration trench system will be designed to treat the larger of the first inch of runoff generated before disposing of any runoff, or 2.5 inches over the impervious area. The k--, proposed well and exfiltration trench systems will keep the site dry during DERM's 5 years - 24 hours storm, and keep the flooding below the site perimeter elevation during South. Florida Water Management District's (SFWMD) 25 years - 72 hours storm. The 100 years — 72 hours storm stage elevation is required to remain under elevation 11.00 -ft NGVD (8" above the average crown of road elevation). Additionally, a separate exfiltration trench system with a sand filter will be needed to collect the parking garage runoff as required by DERM. SW 81h Street is a Florida Department of Transportation (FDOT) Right -of -Way. According to FDOT regulations, additional calculations must be performed as proof that there will be no discharge into the FDOT Right -of -Way. The drainage well system will be designed to retain the maximum storm stage of the 100 -year, 1, 2, 4, 8, 24, 72, 168, and 240 -hour storm events. III. WATER DISTRIBUTION MASTER PLAN The Miami -Dade Water and Sewer Department (MD-WASD) provides the water service in this area. Currently, there is a 16 -inch water main along SW 8"' street, an 8 -inch water main along SW 5t" Avenue, and an 8 -inch water main along SW 9"' Street. Refer to the attached Water Atlas for additional information. Calle Ocho 2 ConsulTech Development Services, Inc. MD-WASD may require the construction of anew 12 -inch water main along SW 5th Avenue. At least two new fire hydrants should be installed on SW 8th Street and SW 9th Street. A final determination on the domestic water and fire service requirements for the proj ect will be made by MD- WASD and the City of Miami Fire Department during the permitting process. The anticipated average daily water consumption for the entire project is 48,865 GPD, and is calculated as shown in Table 2 (See Page 7). IV. SANITARY SEWER MASTER PLAN MD-WASD also provides the sanitary sewer service in this area. There are existing 8 -inch gravity sanitary sewer mains running along SW 8"' Street and SW 9th Street. Service to the proposed development will be provided by sanitary sewer laterals connected to the existing sewer mains surrounding the property. We do not expect any sewer main improvements to be required; however, MD-WASD will make a final determination on the sewer main requirements for the project during the agreement process. This project is anticipated to generate an average daily sewage flow of 48,865 GPD, and is calculated as shown in Table 2(See Page 7). The wastewater produced by the site will travel via the existing sanitary sewer system to the MD- WASD Regional Pump Station No. 1. Pump station No. 1 is currently operating for 6.35 hours per day. According to DERM, the additional 48,865 GPD flow from this project together with reserved flows from other projects proposed in the area will put the pump stationNAPOT at 6.36 hours per day. Thus, the pump station is deemed capable of handling the proposed flow from the project. Pump Station No. 1 transmits all flows directly to the MD-WASD Central Treatment Plant on Virginia Key for final treatment before discharge into the Atlantic Ocean. Refer to the attached projections by Miami -Dade County DERM (See Page 8) for more information. Calle Ocho 3 Consuffech Development Services, Inc. 1� V. SOLID WASTE GENERATION Solid waste generated will be placed in standardized on-site containers for refuse and recyclables per the City of Miami Code, for regular pickup by private hauling companies and/or the City of Miami Solid Waste Department. The solid waste will then be transported to Miami-Dade's Disposal Facilities. Actual waste pick-up locations will be shown in the architectural plans. This project is anticipated to generate an average daily solid waste volume of 389.1 Cu, Yd/month, and is calculated as shown in Table 3 (See Page 9). Generation rates were determined from data provided by the Miami -Dade County Department of Solid Waste. Calle Ocho 4 ConsulTech Development Services, Inc. TABLE 1 CALLE OCHO MIXED-USE DEVELOPMENT DRAINAGE CALCULATIONS 1. Total Net Lot Area = 2.34 Acres 2, 113 of Building Face Area = 0.30 Acres Total Drainage Area = 2.64 Acres 1. Impervious = 100% or 2.64 Acres 2. Pervious = 0% or 0.00 Acres 3. Average Runoff Coefficient = 0.98 4. SFWMD Design Storm Information 1. 5 -Year 24 -Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 6,17 inches per hour Purpose = Flood Protection Peak Runoff = CIA = (0.98)(6.17)(2.64) 15.96 cfs 2. SFWMD 25 Year - 72 Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 7,40 inches per hour Purpose = Perimeter Berm Peak Runoff = CIA = (0.98)(7.40)(2.64) =19.15 cfs 3. SFWMD 100 Year - 72 Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 8.50 inches per hour Purpose = Perimeter Berm Peak Runoff = CIA = (0.98)(8.50)(2.64) = 21.99 cfs 4. FDOT 100 Year - 1 Hour Storm (Figures 5-1 & 5-11) Rainfall Intensity = 5.10 inches per hour Purpose = Discharge to Biscayne Blvd. Peak Runoff = CIA = (0.98)(5.10)(2.64) = 13.19 cfs Calle Ocho 5 Consuffech Development Services, Inc. FDOT Design Storm Information Storm Duration 1 Hour 2 Hour 4 Hour 8 Hour 24 Hour 72 Hour 168 Hour 240 Hour Rainfall Amount (Inches) 5.1 (Figures 5-1 & 5-11) 6.3 (Figures 5-1 & 5-11) 7.8 (Figures 5-1 & 5-11) 9.6 (Figures 5-1 & 5-11) 14.0 (Figure 5-13) 19.0 (Figures 5-14 & 5-15) 20.0 (Figure 5-16) 23.0 (Figure 5-17) 5. Drainage Well Data I . Well Diameter = 24 Inches 2. Assumed Well Capacity = 500 gpm/ft. of Available Head 3. Mean High Tide Elevation = 2.00 ft. (taken from W.C. 20,034-A) 4. Specific Gravity Head Loss = 2.00' 5. Proposed Number of Wells = 4 6. Hydraulic Grade Line Elevations at Well Structure 1. 5 Years DERM Storm _ (15.96 cfs)/[(500 gpm/ft head)(0.002228 cfs/gpm)(4 wells)] + (2.00 + 2.00) 7.58' NGVD 2. SFWMD 25 Years - 72 Hours Storm = (19.15)/[(500 gpm)(0.002228 cfs/gpm)(4 wells)] + (2.00 + 2.00) = 8.30' NGVD 3. SFWMD 100 Years - 72 Hours Storm = (21.99)/[(500 gpm)(0.002228 cfs/gpm)(4 wells)] + (2.00 + 2.00) = 8.93' NGVD 4. FDOT 100 Years - 1 Hour Storm = (13.19 cfs)/[(500 gpm)(0.002228 cfs/gpm)(4 wells)] + (2.00 + 2.00) = 6.96' NGVD Calle Ocho 6 ConsulTech Development Services, Inc. Residential Units 229 units Commercial Space 20,946 SF Office Space 20,173 SF TABLE 2 CALLE OCHO MIXED-USE DEVELOPMENT ANTICIPATED AVERAGE DAILY FLOW OF WATER AND WASTEWATER @ 200 gpd/unit @ 5 gpd/100 SF @ 10 gpd/100 SF Total 48,865 GPD ANTICIPATED AVERAGE DAILY FLOW WASTEWATER Average Flow = 0.049 mgd Peak Flow = 0.183 mgd = 45,800 gpd = 1,047.3 gpd = 2,017.3 gpd NOTES: 1. Peak flow uses a factor of 3.75 times average flow (Recommended Standards for Wastewater Facilities, 1990 Edition) 2. gpd = gallons per day 3. No industrial wastewater is anticipated to be generated 4. mgd = million gallons per day Calle Ocho 7 ConsulTech Development Services, Inc. MIAMI-DADE COUNTY DERM Pump Station No.1 Usage and Projections NAPOT Estimates Program Ver 2.0 This is not an official document. Printed: 3120/2007 10:14:57 AM Proposed Number of gallons (gpd): 48,865 Station Current Projected Projected Used Status (Hrs) Delta (Hrs) Capacity(%) -------------------------------------------------------------------------------- 30 0001 OK 6.35 0.01 6.36 63.60 Calle Ocho 8 ConsulTech Development Services, Inc. TABLE 3 CALLE OCHO MIXED-USE DEVELOPMENT SOLID WASTE GENERATION Residential Towers 229 units @ 1.25 cu. yds /month per unit Commercial and Retail Space 41,119 SF of retail space @ 0.25 cu. yds per 100 SF /month Total anticipated Solid Waste generation = = 286.25 cu. yds./month = 102.80 cu. yds/month 389.1 Cu. Yds. /month Calle Ocho 9 ConsulTech Development Services, Inc. EXHIBITS Calle Ocho ConsulTech Development Services, Inc. SURVEY Calle Ocho Consuffech Development Services, Inc. 150.00'(R)(M) —25 Q' TWO STORY BUILOING .J871 R® F.F,E.=T7.01' o ess• o o �'•p AS P HAL7*N'PAVE M EN T Ilk 88x' TWO STORY BUILDING 0501' D ® oaa F.F.E.=11.48' �v 88.9' ' ; ® 140,00'(R)(M) BN • a r '+t c 1 I9 , S -i {n N O! • v � 4{ M N' TWO STORY BUILOB4G 0591 y F.F.E.=1 coo DZ T 8&9' rp ® V J M D { 'a M •'r y 1W0 STORE BUILDING 0541 R:; m F,FR E.=11.46' .a° 00.0' to 115.60' iq W 16.8' Asr w TWD STORY BUILDING #531 M ® .,' u F.F.E=11.31' ^.� 90.0' � w, D c ag A S P H A L T P A V E M E N T 9 y, m wo STORY BDBDING 521 p 8 F.F.E=11.91' N n —20Mq .10' us, Y P y .Tpl a m m D R Z R l 41.8. � • N G � a4a' ', mcR 5Vd1 P 4 w IN o w *\ • ..TT.85 13.x0' 1x.20' 1'0.4 Il.O & �y.. 11.9'8411.R pp � C : rv. _ R .a9• 6' ASPHALT PARKWAY lze7 COt{CRETE VALLEY GUTTER 22' A S P H A L T P A V E M E N T S. W. 5th AVENUE �-,' Calle Ocho Consuffech Development Services, Inc. WATER ATLAS (MD-WASD) Calle Ocho ConsulTech Development Services, Inc. L_ CONSUL -TECH DEVELOPII$PPr SEIMCES, INC. ^ f �� CONSULTING ENGINEERSCERTIFICATE - FPLANNERSUTHOR - LAND SURVEYORS (VI�J S FLORIDA CERi}FlCATE OF AUTHORIZATION ND_ 9008 40570 N.W. 27 ST., SUITE H101 MIAMI, FLORIDA 33172 (305) 599-3441 FAX. NO. (30S) 599-3143 9291A.- 6 CALLE OCHO MIXED-USE DEVELOPMENT MIAMI-DADE WATER AND SEWER DEPARTMENT WATER ATLAS - N.T.S. SEWER ATLAS (MD-WASD) Calle Ocho Consuffech Development Services, Inc. N 0 R T H EE 115621 i s -or 220 7' 3 17 59654c A CONSUL -TECH DEYMPMENT SEMCES, INC. CONSULTING ENGINEERS - PLANNERS -LAND SURVEYORS FLORIDA CERTIFICATE OF AU-fHORIZAMON NO. 90O8 10570 N.W. 27 ST.. SUITE H101 MIAMI. FLORIDA 33172 (305) 599-3141 FAX. NO. (305) 599-3143 CALLE OCHO MIAMI-DADE WATER MIXED-USE DEVELOPMENT AND SEWER DEPARTMENT SEWER ATLAS - N.T.S.