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_ - - _ - <br /> 024 -: <br /> 14. What type of wastewater management system is proposed for this <br /> project? <br /> A cluster system concept, utilizing pressure sewers and a centralized <br /> drainfield. Effluent is uniformly discharged to the drainfield under <br /> low pressure. For details as to proposed concept design, see <br /> Engineer's Report of October, 1987. <br /> 15. Is the proposed wastewater concept new? <br /> No. Cluster pressure sewer systems are extensively used in coastal <br /> areas. The low pressure pipe system for wastewater treatment and <br /> disposal was developed in North Carolina by N.C. State University and <br /> more than 5,000 low pressure septic systems have been built in North <br /> Carolina since 1932. <br /> 16. How are system design factors determined? <br /> Both the N.C. Di.VisiOn of Health Services and <br /> ronmental i�Iananer. - C, Division of :�nvi- <br /> Went have complex criteria for sizing and designing <br /> low pressure wastewater systems. A registered professional engineer <br /> is required to plan, design and oversee construction of the waste- <br /> water system. At the completion of construction, the design engineer <br /> must certify that the wastewater system was constructed in accordance <br /> with State approved plans and specifications. <br /> 17. What protection measures are designed into the system to minimize the <br /> adverse impacts of a system malfunction? <br /> a) Primary treatment is provided by individual, on-site septic <br /> tanks, thereby minimizing the impact of potential malfunction <br /> as opposed to a singular treatment unit. <br /> b) The pressure sewer system is constructed to water distribution <br /> system standards. Due to the relatively low pressure levels <br /> within the sewer system, malfunctions are rare and quickly <br /> contained and repaired. <br /> c) Prior to subsurface irrigation, the primary treated wastewater <br /> is stored in an equalization and solids filtration chamber. <br /> Approximately 24 hours of emergency storage is available at all. <br /> times. A quadraplex pumping and drainfield system is proposed <br /> to allow drai_nfields sufficient time to rest and reaerate. <br /> d) The system is operated and maintained by a responsible, <br /> certified, contractor utility. <br /> 13• What type of surface and groundwater monitoring is proposed? <br /> Groundwater monitoring wells will be installed and monitored for <br /> fecal. coliform and nitrogen levels on a quarterly basis. Results <br /> must be furnished to the State regulatory agency having permit <br /> authority over the system. <br /> CRAIG B. MORGAN AND ASSOCIATES, P.A.. <br />