Loading...
2023-02-16 V. A. 23-001-TRC Engineering Review Comments MO RR I S 2914 Cleveland Avenue I Fort Myers, Florida 33901 �/ DEPEW Phone (239) 337-3993 I Toll Free (866) 337-7341 www.morris-depew.com ENGINEERS • PLANNERS •SURVEYORS LANDSCAPE ARCHITECTS 23-001 TRC Engineering Review Comments DATE: February 9, 2023 TO: City of Okeechobee FROM: Morris-Depew Associates Inc., Engineering Dept. The following comments are provided based on a review of the proposed plans for 23-001-TRC for compliance with all potentially applicable regulations. It is understood that it may be appropriate to grant relief from some standards (based on existing site and infrastructure conditions unknow to the reviewers and based on typical development practices in the city) as determined by the City Administrator and City Public Works Director. Sec. 78-36.-Sidewalks,driveways,and pedestrian access. (a)When required. (1)All projects,except for those involving only one individual single-family structure,constructed in zoning districts set out in section 90-71 of this Code,wherein the lands of the owner and/or developer adjoin a collector or arterial street or city right-of-way,shall provide sidewalks adjacent along each such street or right-of-way. (2)Sidewalks shall be provided on residential streets in proposed and replatted subdivisions. 1. Provide typical design width on plans for sidewalks. Provide cross walk striping details and detectable warning strips for proposed sidewalks. 2. Address potential drop from sidewalk crossing to existing inlet at corner of NE 3`d AVE and NE 4th ST. 3. Provide for Sidewalk location in Typical Section B-B. Include provision for minimum clear graded area to avoid edge drop off to proposed swale. Sec 86-182-(e) Areas to be used for water retention purposes shall be designated as"general purpose areas"on the plat and shall not be shown on the plat in any other way. Such areas shall in no circumstances be given a lot designation in the subdivision. Such areas shall be held in common ownership and maintained by the property owners'association. Such property owners'association shall be provided for in the protective covenants specified in section 86-72,with provisions that provide for maintenance of retention areas and assessment of property owners by the city if the property owners'association fails to adequately maintain such water retention areas.If the city council agrees to accept the dedication of the water retention areas,they shall be deeded as general purpose areas in a given block, as the case may be. 4. Common detention areas for subdivision should be depicted as"general purpose areas" outside of the proposed lots. 5. Provide locations on plan view of sheets 301-C302 for typical cross section A-A Fort Myers I Tallahassee I Destin LC26000331 Page 12 Sec. 86-185.-Wastewater and water. Standards for installation of water,wastewater and storm wastewater are as follows: Installation of any water and wastewater system shall comply with appropriate state regulations and standard specifications provided in the Public Utilities Manual and the Manual of Standards and Design Construction and Maintenance for Water and Wastewater Systems,and shall be installed under the direction and supervision of,and subject to the inspection and approval of,the city. If any defects shall occur in the water or sanitary wastewater facilities within one year from the date of acceptance by the city,such defects shall be remedied and corrected at the developer's expense. The specifications and location of fire hydrants shall be approved by the city. 6. Provide horizontal dimensions between proposed water and sewer mains. 7. Provide additional details and criteria for proposed sewer design including lift station details. 8. Manhole details are provided in details, however manholes are not provided in the design. Please address. 9. Provide proposed sanitary sewer easement for maintenance of system on future lots. 10. Provide force main design from lift station to point of connection to existing system. 11. Proposed sewer mains appear to be in conflict with proposed landscape buffers. 12. Does proposed 8"water main connect to existing 6"water main on NE 4th Street? 13. Fire Hydrant at NE 3rd AVE and NE 5th Street appears to be located within proposed sidewalk. Please address. 14. Will duplex/2 family buildings need separate water meters? 15. Provide details for proposed water service connections to 16"water main on NE 2nd Ave 16. Provide details for water main crossing of NE 4th ST. (Direction bore,jack and bore,casing, open cut with pavement restoration, horizontal separation from existing storm,etc.) 17. Prior to construction commencement,provide a sewage collection/transmission system construction permit from Florida Department of Environmental Protection and approval from local sewer authority. 18. Prior to construction commencement, provide a water main extension construction permit from Florida Department of Environmental Protection and approval from local water authority. Sec. 86-184. -Bridges and culverts. (a)All bridges and culverts shall meet the standards specified by the state department of transportation as contained in Standard Specifications for Road and Bridge Construction. (b)Locations of bridges and culverts,with construction data and full specifications, shall be shown in an exhibit, and approval or acceptance of the final plat shall not be accomplished unless such exhibit is transmitted. 19. Proposed Driveway culverts on NE 2nd Ave appear to conflict with existing 16"water main. 20. Proposed culverts on south side of NE 4th street appear to conflict with existing 5'storm drain. Please address. Have alternate designs to connect to 5'storm drain been considered? Provide invert and end treatment details for control structure connections to proposed roadside swales on NE 4th Street. 21. Provide minimum pipe coverage details per FDOT Standards for proposed CMP culverts under proposed asphalt within public right-of-way. 22. Please provide details for culvert end treatments for culverts under proposed sidewalks. 23. Provide additional details for proposed culverts and existing culverts at the corner of NE 5th ST and NE 3rd AVE 24. Invert of proposed sidewalk culvert at NE 4th ST and NE 3rd AVE appears lower than RIM elevation of existing storm drain of 18" RCP to south. Page 13 25. Proposed Driveway culvert on NE 4th street appears to conflict with existing storm drain. Please address 26. Provide minimum pipe coverage details for proposed CMP culverts under proposed asphalt within public right-of-way Sec. 34-2.- Fire hydrants. Fire hydrants shall be provided in all water mains,transmission and distribution systems. Fire hydrants shall be spaced such that the maximum distance for protection will not be more than 500 feet as the fire hose lays. The appropriate fire marshal has final jurisdiction on all hydrant and fire sprinkler line locations during plan review. A fire marshal-approved plan is required with all preliminary plan submissions. Each hydrant shall be capable of delivering a flow of at least 500 gallons per minute with a residual design pressure of not less than 20 psi. Fire hydrants shall be of the dry barrel breakaway type conforming to AWWA C502,with two 2%2-inch threaded hose nozzles and one 4'/2-inch threaded pumpler nozzle. Hydrants shall have a 51/4-inch interior valve opening and be restrained from the hydrant to the tee at the main. Restraint by use of"all-thread"rods shall not be allowed. At the discretion of the city administrator,additional protection for fire hydrants shall be provided including,but not limited to,concrete filled ductile iron traffic posts. Fire hydrant branches(from main to hydrant)shall be a minimum of six inches inside diameter. Each branch shall be provided with a resilient seat gate valve located as close as possible to the main. Hydrants shall be located near road lines with the pumper discharge nozzle facing as directed by the fire marshal. Hydrants shall be laid to minimize their vulnerability to traffic. 27. Provide correspondence from Fire Marshall that the location and number of fire hydrants as proposed are sufficient for the development. Sec. 78-101.- Requirements. (a)Required stormwater management systems shall comply with state approved standards adopted by the South Florida Water Management District. (b)Minimum stormwater management requirements are as follows: (1)Stormwater treatment and disposal facilities shall be designed for a 25-year storm event of 24-hour duration. (2)The first inch of stormwater runoff shall be treated on site. (3)Post development runoff rates,volumes and pollutant loads shall not exceed predevelopment conditions. (4)Erosion and sediment controls shall be used during construction. (5)Minimum road elevation is the crown of the road or 100-year,three-day event,whichever is highest. 28. Please ensure that the placement of the silt fence follows the requirements of the"Florida Stormwater, Erosion and Sediment Control Inspector's Manuals". 29. The written report states that pavement areas will pass through the dry detention areas. Please confirm that unpaved areas will pass through the dry detention areas as well. (The Storm CAD model appears to indicate that all water from each of the developed blocks will be routed through the stormwater pond.) 30. Please indicate how site grading and or drainage infrastructure will route water to the ponds. 31. The control elevation for BLOCK 110 is listed as 23.0 and the proposed pond bottom elevation is listed as 23.33, SFWMD requires a dry pond bottom to be 1' higher than the control elevation for the site. Please address. 32. The control elevation for BLOCK 121 is listed as 24.0 and the proposed pond bottom elevation is listed as 24.33, SFWMD requires a dry pond bottom to be 1' higher than the control elevation for the site. Please address. Page 14 33. Under the allowable discharge calculation on the second page of the report pdf,the Block 121 project acreage is listed as 2.20 acres. Total Basin Acreage on sheet 6 of your drainage report lists the total Basin Acreage as 2.17 acres. Please clarify. 34. At the bottom of the second page in the drainage report is a statement that says"Since the proposed water quality system is dry detention,the volume required is 100%of the calculated volume." Please be advised that the dry pond water quality volume requirement is 75%of the requirement for water quality being provided by a wet pond. 35. Section B Water Quantity on page 3 of the drainage report states"The actual maximum discharge rate for the 10-year, 72-hour storm event was calculated and shown below,which is within tolerance of the maximum allowable peak rate.To demonstrate conformance to this criterion,the proposed project was flood-routed using WaterCAD." Was this referring to the 25-year event instead? 36. Nutrient Loading: Please provide a site-specific pollutant loading analysis. If retention is required to meet pollutant loading goals, please ensure retention areas are compliant with a 72 hour drawdown requirement. 37. Please demonstrate the tailwater assumptions used in the WaterCAD model. Consider that Block 110 swale as an invert elevation of 23.3 and an eop elevation of 25.7 within the vicinity of CS-1. 38. Please demonstrate the tailwater assumptions used in the WaterCAD model. Consider that Block 121 swale as an invert elevation of 24.3 and an eop elevation of 25.8 within the vicinity of CS-2.