Agenda - 08-18-1987 - Laserfiche WebLink

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b. The pump stations be capable of handling peak-hour flows with the largest pump out of service; and c. Emergency standby power and alarm systems be installed at both pump stations within the project. 5. When system failure does occur from soil clogging the surface, overland flow from rainfall maay conttaamminantsrdirectlypto to a stream or lake. Another type of failure is when pollutants move too rapidly through soils. 0 ASA recommends that appropriate surface water and groundwater monitoring be established to provide for early identification of system operating problems. The level of monitoring required should be reflective of the intensity of loading proposed. Assuming 158 units, loading rates of 450 gallons per unit per day, and the proposed HLR of 0.2 gallons per da y square foot, nearly 8.2 acres of primary absorption field area would beer needed. This system would supposedly treat more than 70,000 gallons of wastewater per day. This is an extremely intense loading rate for a system within a protected, upland public water supply watershed. Stormwater runoff from the absorption field should be routed through an adequately sized detention pond as a further means of protecting stream quality. The detention pond can serve as a polishing lagoon and a sampling point. 6. The project developer has proposed to construct gravity wastewater collection lines which could be connected to the public sewerage collection system if it becomes available in the area. OWASA recommends that because these lines are an important component of the system, DEM should require that they be constructed to acceptable municipal standards, such as OWASA's Standard Specifications. This will help to reduce the potential for inflow and infiltration into the collection system and potential exfiltration problems resulting from failure of the collection system. Utility construction should be properly inspected to assure compliance wih the required standards. OWASA also recommends that sewer utility easements be reserved so that such lines can be properly maintained. The easements must permit the lines to be maintained, repaired, constructed or reconstructed by the operating utility, in the event that it becomes necessary. 7. A frequent cause of early failure of soil absorption systems is the use of poor construction techniques. Regular inspections during construction of the system must be undertaken by the Division of Environmental Management and/or Division of Health Services to assure proper construction techniques and compliance with the approved plans. 8. The disposal of the residue in the two community septic tanks is a concern. The developer should be required to provide assurances that septage will be pumped out on a regular basis and that it will be disposed of by a certified party in accordance with applicable State regulations. -4-