[Adopted 1-16-2006 by Res. No. 2006-F]
The Conewago Township Board of Supervisors understands that the use of pumping stations and related force mains may be the most cost-effective way to provide sanitary sewer service for future customers. Therefore, the Board of Supervisors has adopted this resolution to provide uniformity for the design, construction, and maintenance of pumping stations to be installed in the Conewago Township sanitary sewer service area.
A. 
The Township hereby approves the use of the self-priming suction-lift wastewater pumps (Super T-Series Pumps) as manufactured by Gorman Rupp or equal. All valves, discharge piping, controls, and related equipment shall be as manufactured and/or supplied by Gorman Rupp. In the event suction-lift pumps cannot meet the hydraulic conditions of the pumping station, the Board of Supervisors may consider the use of submersible pumps as outlined in § 118-46. The developer and the developer's consultant shall submit an engineer's feasibility report to the Township/Supervisors in the event submersible pumps are required.
B. 
The wastewater pumping equipment shall meet the following specifications, features, and performance record:
(1) 
Pump type: suction-lift (Super T-Series Pumps).
(2) 
Valves: All ports shall be capable of passing three-inch solids.
(3) 
Pumping equipment enclosure: See § 118-48, Pumping station building.
(4) 
Discharge: Flanged header pipe shall be ductile iron pipe.
(5) 
Liquid level control: Air bubbler with electronic pressure switch for normal operation, provide standby independent high water alarm float switch.
(6) 
Alarm system: remote alarm monitoring device with dialer capability and internet programming by Omni-site.
(7) 
Warranty: one year from facility startup.
(8) 
Record: Manufacturer must provide history and references.
(9) 
Impeller access: large cover plate opening for unclogging and removal of the impeller.
(10) 
Gauges: suction and discharge pressure gauges shall be four inches in diameter and shall be glycerin filled.
(11) 
Testing: The pumps and controls shall be tested as a unit at the pump manufacturer's facility prior to shipment.
A. 
Power supply: 460, 230, 208 volt 3-Phase, phase conversion equipment shall not be acceptable. Transformers shall not be utilized to convert voltage for pump and motor unit(s) operation.
B. 
Motor RPM: 1750.
C. 
Control panel: mounted inside pump equipment housing, UL label for "Enclosed Industrial Control Panels;" provide hour meters, to be approved by Supervisors.
D. 
Control voltage: 110 volts.
E. 
Electrical components: Allen-Bradley, General Electric, or Furnas.
F. 
Wiring and schematics: shall be in compliance with the National Electric Code (NEC).
G. 
Standby power: LP gas engine with auto-start auxiliary drive or as approved by the Supervisors; also provide plug in for portable generator unit to operate the entire pumping station.
H. 
High water standby alarm: separate float switch shall be wired directly to the programmable Internet Telephone Dialer.
As previously stated, the Board of Supervisors may consider the use of alternative submersible pumping equipment in the event suction-lift pumps cannot meet the hydraulic conditions. The alternate submersible pumping equipment shall be as manufactured by Gorman Rupp. All valves, discharge piping, controls, and related equipment shall be as manufactured and/or supplied by Gorman Rupp. All valves, controls, gauges, housing, access doors, and related equipment shall be provided by a single source supplier and be mounted in an above-grade valve vault housing. The wastewater pumping equipment shall meet the following specifications, features, and performance record:
A. 
Pump type: submersible (J- Series Package Wastewater Pumping Station).
B. 
Valves: All valve ports shall be capable of passing three-inch solids and located above grade.
C. 
Pumping equipment enclosure: reinforced fiberglass or construction as approved by the Supervisors.
D. 
Slide rails: stainless steel.
E. 
Discharge: flanged header pipe shall be ductile iron pipe (class 53) and provide an emergency bypass discharge connection.
F. 
Liquid level control: air bubbler with electronic pressure switch for normal operation, provide standby independent high water alarm float switch.
G. 
Alarm system: remote alarm monitoring device with dialer capability and internet programming by Omni-site.
H. 
Warranty: one year from facility startup.
I. 
Record: manufacturer must provide history and references.
J. 
Gauges: Discharge pressure gauges shall be four inches in diameter and shall be glycerin filled.
K. 
Testing: The pumps and controls shall be tested as a unit at the pump manufacturer's facility prior to shipment.
The site plan will be subject to the review and approval of the Board of Supervisors and the Board of Supervisors' consulting engineer prior to submission to the Pennsylvania Department of Environmental Protection for permit and prior to any construction. The following shall represent minimum site requirements:
A. 
Fence: The pumping station site shall be protected by a galvanized chain-link fence six feet in height with three-strand barbed wire above; provide core bonded vinyl chain-link fabric (two-inch mesh).
B. 
Access: The access road shall be paved (including six inches 2A stone, five inches BCBC, 1.5 inches wearing surface, the slope shall not exceed 12%), and shall be accessible during a one-hundred-year flood.
C. 
Landscape: The site shall be seeded and the slopes shall not exceed 20%; provide evergreen screening trees and an appropriate planting schedule.
D. 
Subdivision: The site shall be subdivided with separate deed for dedication to the Township/Supervisors. The Supervisors shall approve acreage of the site.
The pumping station building plan will be subject to the review and approval of the Board of Supervisors and the Supervisor's consulting engineer prior to the submission to the Pennsylvania Department of Environmental Protection for permit and prior to any construction. The following shall represent the minimum requirements for the pumping station building:
A. 
Structure: The building at a minimum shall have an eight-foot ceiling height, twelve-foot overall width, and twenty-foot overall length. The walls shall be constructed of architectural split-face masonry units with accent blocks provided.
B. 
Security/locks: key locksets to the Authority/Township's existing master key system.
C. 
Ventilation: Power ventilator shall provide for 12 air changes/hour (continuous) or 30 air changes/hour (intermittent).
D. 
Manholes: no manholes or wet well access in the pumping station building.
E. 
Water service: provide 3/4 inch hose bib and sink located in the building; provide a backflow preventer.
F. 
Heat: provide electric heater.
G. 
Lighting: provide fluorescent lighting inside the building and high-pressure sodium for the exterior light.
H. 
Electrical receptacles: Provide a minimum of three duplex outlets with ground-fault protection with waterproof covers. One duplex receptacle to be located on the building exterior.
A. 
The pumping station wet well shall be subject to the review and approval of the Board of Supervisors and the Supervisors' consulting engineer. The wet well design shall be in general conformance with the guidelines as provided by the Pennsylvania Department of Environmental Protection.
B. 
The following shall represent the minimum requirements for the pumping station wet well:
(1) 
Penetrations: shall be sealed to prevent sewer gas leakage utilizing link seal or equal.
(2) 
Access door: provide a minimum 30 inches by 30 inches aluminum access door (the loading rate shall be 300 pounds per square foot), and automatic hold-open door.
(3) 
Size and slope: The wet well shall be designed in accordance with the most recent wastewater facilities manual as prepared by the PA DEP.
(4) 
Ventilation: Ventilation shall be as required by the PA DEP.
(5) 
Shape/material: cylindrical reinforced concrete.
C. 
The Board of Supervisors may require the use of PVC or epoxy-lined wet wells where there exists a potential for a corrosive condition, e.g., hydrogen sulfide.
Submittals (four complete sets) as submitted to the Board of Supervisors for the engineer's review shall include the following: design calculations, system head curve, total dynamic head, flow quantification, wet-well volume, pump duty cycle at average and peak daily flow, force main line velocity, net positive suction head available, reprime data, plan view and section view of pumping station, location plan, site plan, fence specifications, operation and maintenance manuals, electrical schematic, and as required by the Board of Supervisors or the Supervisors' engineer.
The Board of Supervisors shall require the developer to provide spare parts for the pumping station. The following shall be considered to be the minimum spare parts list for the pumping station. Item description:
Two complete mechanical seals, including gaskets, and shaft sleeve
One set of impeller clearance adjustment shims
One quart of seal lubricant
One cover plate O-ring
Rotating assembly O-ring
Shim pack (two sets)
Suction flap valve
Spare fuses of each type in the control panel (two sets)
A. 
The Board of Supervisors' personnel shall receive startup training on the pumping equipment, controls, and auxiliary power system at the time of initial pumping station startup.
B. 
The pumping station may be dedicated to the Board of Supervisors following a one-year period (minimum) of successful operation. Record drawings shall be provided prior to time of dedication.
C. 
An escrow/maintenance fund shall be established to provide for the unforeseen maintenance issues and replacement parts during the first two years of operation.
This article shall supersede any previous resolution, regulation, or rule regarding the construction and operation of wastewater pumping stations.