section 4 - existing conditions and needs - Martin County, Florida

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4.12.3 Sewer System Needs The majority of the residences/lots within the CRA boundary lack connection to a centralized sewer system. The exceptions being the Manatee Creek and Murray Cove neighborhoods, as well as an 8” inch sewer main of Bollard Avenue. There are some private lift stations for some commercial and institutional buildings. In an effort to connect the CRA to the South System, a comprehensive wastewater collection system will have to be designed, permitted, and constructed. 4.13 WATER AND WASTEWATER SYSTEM LEVEL OF SERVICE DEFICITS Areas currently not served by central water and sewer service are considered to be deficient relative to the LOS definition. There are a number of areas serviced by 4” inch and 2” inch diameter water mains. While these lines may be sufficient for providing the daily needs of the customer, they are insufficient compared to the minimum 6” inch diameter pipe needed to support basic fire service, unless a hydrant serviced by a 6” inch line is in close proximity of the structure. Figure 8, “Existing Water Piping”, delineates the existing central water piping system within the CRA as reported by Martin County Utilities. The water piping shown in the exhibit is limited to 6” inch diameter and larger. Areas shown in the exhibit which do not have existing piping are considered to be deficient in accordance with the LOS standards. Figure 9, “Existing Wastewater Piping”, delineates the existing wastewater piping system within the CRA as reported by Martin County Utilities. The gravity portion of the sewer system installed does not have any known service deficits. According to the March 2000 Forcemain System Hydraulic Analysis by Hutcheon Engineers, 100% of the lift stations within the CRA boundary are able to deliver the required flows during peak flow conditions. 4.14 LEVEL OF SERVICE RECOMMENDATIONS FOR WATER AND WASTEWATER Level of Service (LOS) standards for the water and wastewater systems are identified through a combination of engineering standards, utility purveyor policies, community practices, and regulatory requirements as presented in Section 3. Throughout the CRA area (as well as other areas of the County) there are large tracts of land lacking central water service and rely on individual wells for their water supply. Similarly, there are large areas which do not have access to a central sewer system and utilize on-site septic systems to dispose of their sewage. The intent of the CRA utility redevelopment process is to: provide central water and sewer service to all parcels within the CRA; provide consistent quality potable water to all residents; provide sufficient fire flow to respond effectively to emergencies; and, eliminate operational and environmental problems associated with on-site treatment systems. Accordingly, the basic LOS standard for all areas within the CRA incorporates the following: MARTIN COUNTY STORMWATER/UTILITY CRA MASTER PLAN – PORT SALERNO CRA SECTION 4-12 EXISTING CONDITIONS AND NEEDS (07/03/06)
− Centralized potable water service to supply the consumptive needs of all parcels within the service area − Minimum fire flow to every parcel consistent with the potential use of all parcels − Centralized Sewage collection service for all parcels Inherent in providing the LOS standards are implied minimum design standards utilized for sizing the pipes and related facilities. Design standards are developed from a combination of: national standards; Martin County policies and practices; and, regulatory requirements and guidelines. These include the following: 1) Water systems a. Minimum 6” inch diameter water lines – In order to provide a basic level of fire protection, fire hydrants are required to be connected to minimum 6” inch diameter water lines. A number of areas within the CRA have 2” inch and/or 4” inch diameter lines which can provide basic water service but do not provide adequate flow for fire protection. b. Provide Fire Hydrant availability to all Parcels – Installation of fire hydrants at approximately 500’ foot intervals ensures adequate hydrant availability for each structure. c. Minimum system pressure under peak flow condition is 40 pounds per square inch (psi) – During the maximum anticipated flow condition, minimum pressure requirements at the point of the service connection provides sufficient pressure to adjacent structure plumbing systems. d. Minimum system pressure under fire flow condition is 20 psi – During a fire, the minimum requirement for 40 psi at the service connection is relaxed to 20 psi for the period required to respond to the fire. Unless unusual conditions require special consideration, it is assumed the fire flow event is run in conjunction with Maximum Day Flow on the system, rather than the peak flow condition. e. Fire Flow Requirements – Minimum standards include providing a 500 gallon per minute (GPM) fire flow to single family residential areas and a maximum fire flow demand of 1500 GPM to non- residential areas. While many areas of the system can obtain larger fire flows, this is the maximum the system would deliver at the most remote point on the anticipated day of the year with the highest water demand. Demands in excess of this amount may require additional pumping or storage on site. 2) Wastewater systems a. Wastewater Service provided by central collection system – A number of areas within the CRA boundary have an on-site treatment system (septic tanks or small package plants). It is the intent of this project to eliminate the on-site treatment systems and tie the customers into the central sewer system as a basic LOS. MARTIN COUNTY STORMWATER/UTILITY CRA MASTER PLAN – PORT SALERNO CRA SECTION 4-13 EXISTING CONDITIONS AND NEEDS (07/03/06)
Page 1 and 2: 4.1 BACKGROUND SECTION 4 - EXISTING
Page 3 and 4: Port Salerno Elementary School 43-0
Page 5 and 6: calculations based on existing plan
Page 7 and 8: Each of the neighborhoods previousl
Page 9 and 10: 4.8.3 Port Salerno The Port Salerno
Page 11: Current County customers in the Por

section 4 - existing conditions and needs - Martin County, Florida

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