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INTEROFFICE MEMORANDUM: 8712-1804 O Ci <br /> PD-4-87 McLennan ' s Farm U1 <br /> December 30, 1987 <br /> Page 2 <br /> alternate dosing of remaining fields is regulated at a main <br /> control panel . A 100% reserve area is provided. ) <br /> 4. Provide adequate measures to prevent the accidental discharge of <br /> wastewater from the proposed facilities into surface and ground <br /> waters. <br /> ( Primary treatment is provided by individual , on-site septic <br /> tanks, thereby minimizing the impact of potential malfunction as <br /> opposed to a singular treatment system. The pressure sewer <br /> system is constructed to water distribution system standards. <br /> Due to the relatively low pressure levels within the sewer <br /> system, malfunctions are rare and quickly contained and <br /> repaired. Prior to subsurface irrigation, the primary treated <br /> wastewater is stored in an equalization and solid filtration <br /> chamber. Approximately 24 hours of emergency storage is <br /> available at all times. A quadraplex pumping and drainfield <br /> system is proposed to allow drainfields sufficient time to rest <br /> and reaerate. ) <br /> 5. What is the impact of recreational uses of the area on the long <br /> term suitability of the soil absorption area? <br /> (The drainfield site can be used for athletic functions, <br /> however, permanent structures are not permitted . ) <br /> 6 . Establish appropriate monitoring of surface and groundwater. <br /> OWASA also recommends that a detention pond be built for <br /> stormwater runoff to further protect water quality. <br /> (Groundwater monitoring wells will be installed and monitored <br /> for fecal coliform and nitrogen levels on a quarterly basis. <br /> Results must be furnished to the State regulatory agency having <br /> permit authority over the project. ) <br /> 7. The proposed system should be constructed and inspected <br /> according to acceptable standards. Sewer and utility easements <br /> should be reserved for construction and maintenance of the <br /> system. <br /> (Both the N. C. Division of Health Services and the N. C. Division <br /> of Environmental Management have complex criteria for sizing and <br /> designing low pressure wastewater systems. A registered <br /> professional engineer is required to plan, design and oversee <br /> construction of the system. At the completion of construction, <br /> the design engineer must certify that the wastewater system was <br /> constructed in accordance with State approved plans and <br /> specifications. Drainage and utility easements have been denoted <br /> on the plan. ) <br /> 8. Provide assurance that disposal of solid wastes from septic <br /> tanks and from process-pumping facility will be carried out by a <br />