Attachment_1_-_SOW_Hains_Point_Sewer_Ejector_1-18-23.docx

STATEMENT OF WORK

NATIONAL MALL AND MEMORIAL PARKS

SEWAGE LIFT STATION CONTROL REPLACEMENT

BACKGROUND

The National Park Service (NPS), National Mall and Memorial Parks (NAMA) has multiple above ground Smith and Loveless sewage lift stations in East Potomac Park. The control systems for these sewage lift stations need to be replaced with a control system that is compatible with the existing Smith and Loveless sewage lift station motors and pumps. The existing system consists of a Horizontal Centrifugal - Station with PLC units (V708iSD, S#7050195), VFD units [VFS11-2037PM-WN(2)], transducer well level system with backup float control system. The obsolete control panel & components control dual pump system consisting of 2ea-7.5 Hp, 3 phase, Smith & Loveless sewage ejector pumps with vacuum priming systems. This project will replace the existing control systems and install new compatible control systems according to the Statement of Work.

1. PURPOSE

The contractor will be responsible for providing all necessary labor, equipment and materials needed to replace sewage pump controls & components on existing sewage lift station(s) with new controls and components and adding the capability of remote monitoring, The Hains Point Comfort Station 1 shall be updated with a new modern control system with a remote monitoring system.

Hains Point Comfort Stations 3 & 4 shall be separate options requiring the same controls and remote monitoring equipment as the Hains Point Comfort Station 1.

1. LOCATION

All work is located at Hains Point near 1000 Ohio Drive SW, Washington DC, 20020

Base Item

· Hains Point Comfort Station # 1

Option Items

· Option 1 - Hains Point Comfort Station 3. Work to be performed is identical to Hains Point Comfort Station 1 as specified above.

· Option 2 - Hains Point Comfort Station 4. Work to be performed is identical to Hains Point Comfort Station 1 as specified above.

1. TASKS

A. Contractor shall empty the sewage pit before shutting down the existing system and coordinate the closure of the restroom with the COR. The pit will be washed down and pumped out prior to removing any of the existing control equipment.

B. Remove existing pump station monitoring and control system as necessary and install a new Watertronics or approved equal control and monitoring system that is compatible with the existing pumps and motors and meets the following specifications:

a. Contractor shall provide variable speed Horizontal Centrifugal pump station controls that will be compatible with the existing system pumps and motors. The station(s) shall be designed to be installed inside the existing weather resistant structure.

b. Contractor shall provide station electrical control panel(s) which will be UL listed and meet or exceed UL508A specifications for safety of industrial control panels. Panel(s) shall be assembled and tested in a UL508A certified panel shop.

c. New pump station plumbing components provided by the contractor shall be painted in a sandstone color for maximum durability and resistance to corrosion. The paint system shall consist of a multi‑step system including media blasting, application of a rust prohibitive epoxy prime coat followed by a two-part industrial grade ultraviolet resistant polyurethane finish having a total dry film thickness of not less than 5 mils. Each coat will be applied according to manufacturer standards. Pump station components including base, pipework, discharge heads, manifolds, isolation and relief valves, grooved clamps and supports shall be painted unless otherwise specified.

d. Contractor shall provide a robust industrial grade remote pod style wet-well level monitoring & control system. The system shall consist of a level transducer and a low-level safety shutdown float designed for location in the sewage ejector pit for accurate and reliable level control. The controls shall be fully integrated with the control system with programmable set points accessible through the station(s) touchscreen display. The level control system shall function to shut down the pump system in the event of a low water condition.

e. An additional isolated 5A relay contact shall be provided for control of ONE external pond fill or other external fill source.

f. The level transducer shall be rated for a maximum water depth of 33.5 feet. Maximum distance from control panel(s) to pod 100 feet.

g. A 3-pole 60-amp maximum fused UL listed main disconnect switch, or approved equivalent, shall be provided at each location. The disconnect switch shall include an operating handle mounted in the main electrical panel door that shall open all ungrounded conductors of the service entrance to the panel. The disconnect switch shall be mechanically interlocked to prevent access while the operating handle is in the ON position. The station disconnect switch shall be correctly sized for the maximum station load and shall meet all applicable NEC and UL508A requirements.

h. Contractor shall provide a high efficiency industrial grade 10HP variable frequency drive (VFD). The VFD shall be specifically designed for water pumping applications and include a graphical control interface keypad. All internal printed circuit boards shall be conformal coated for long service life.

i. Conformal coating material is a thin polymeric film which conforms to the contours of a printed circuit board to protect the board's components. Typically applied at 25-250 μm thickness, it is applied to electronic circuitry to protect against moisture, dust, chemicals, and temperature extremes.

1. The contractor shall provide with the quote the conformal coat thickness they shall provide.

i. Contractor shall provide a 460-575V/3Ph - 10HP cross line (XL) industrial grade dual interlocking contactor set for the pumps. The contactor set shall allow the assigned pumps to be run manually across the line or from the VFD output. It will also facilitate sequencing of pumps. An HOA, (Hand-Off-Auto) switch will be provided for each pump. When HOA is in Hand position, the contactor set will engage to power pump directly across the line. If Off position, pump will be disabled and when in Auto, pump will run on VFD when assigned as lead pump otherwise the contactor set will sequence the pump on as a lag pump where applicable.

j. The electrical control system shall be an industrial grade PLC with a color touch screen operator interface device and custom programming written specifically for this project to perform the functions laid out in the specifications.

i. Control logic shall be based on redundant design and interlocking of control devices for maximum safety and proper sequence of operation.

ii. In addition to diagnostic functionality available through the touchscreen display, the PLC controller shall also have diagnostic LEDs for monitoring status of discrete inputs and outputs.

iii. The PLC shall contain RS232 and RS485 communication ports for monitoring and programming purposes and shall contain an EEPROM, battery backed RAM and non-volatile memory for storage of critical configuration data. The PLC will have a high-speed counter, clock and calendar function with year, month, day, hour, minute, and day of week.

k. Contractor shall provide an advanced microprocessor-based Power Phase Monitoring system to protect the pump system from equipment failure due to power faults occurring on the incoming electrical service to the pump station. The monitor shall actively monitor for phase loss, phase reversal, phase unbalance, under voltage and overvoltage conditions. In the event that one or more of these conditions occur, the Phase Monitor shall signal the PLC logic controller to shut down the pump system preventing damage to pump system components. The phase monitor fault limits and time to trip shall be adjustable. A status LED shall indicate the fault type causing the shutdown event.

l. Contractor shall provide an industrial grade 7.0" WVGA (800x480) Wide Color TFT LCD touchscreen user interface display or approved equal featuring:

i. Digital flow (GPM) and pressure (PSI) display, both cumulative and resettable gallons pumped indicators,

ii. Pump ready/running status with elapsed run time display per pump

iii. Flow-based pressure regulation to match discharge pressure with sewage force main tie in points

iv. Individual motor overload reporting, minute by minute data logging saved to a removable flash RAM card

v. 32MB card to store approximately 12 months of data

vi. Historic and real time X-Y plotting of pump station operation

vii. Filter controls, Alarm log file

viii. Ability to change system parameters such as setpoint pressure and time delays

ix. Life of the display shall be 50,000 hours.

x. The display software shall be configured for the pump station features.

m. Contractor shall provide a lighted switch actuator which shall be illuminated GREEN whenever the controlled item is active. One required per switch.

n. Contractor shall provide a standard 40kA max impulse current rated surge protective device on the incoming power connections to the station. The SPD shall utilize high-energy solid-state suppression circuitry to effectively protect electrical equipment from severe electrical disturbances. Diagnostic LEDs shall be provided on the device to indicate operational status of the device when powered.

o. Contractor shall provide an optical coupling device for sharing of pump station flow signal with external customer control systems. The opto-coupler must be rated for 3-30VDC (24VDC) nominal supply from customer control system and shall provide a minimum of 2500V isolation between station control system and external systems.

p. Contractor shall provide a 24VAC/DC remote disable relay input. The remote disable relay shall effectively disable the pump station when the remote start relay coil is supplied 24VAC/DC power from an external power. If the station is running and relay is powered, the station will safely shutdown. When power is removed from the relay, the station will return to normal operation.

q. Contractor shall provide a WaterVision Cloud - Verizon network 4G/LTE CELLULAR remote pump system monitoring package or approved equal that meets the following specifications.

i. The system includes all hardware, software and 5 YEAR SUBSCRIPTION for connection of a single pump station to the WaterVision Cloud Network via a cellular connection or approved network.

ii. The system shall allow customer to remotely monitor the pump station and the customer's other WaterVision Cloud, or approved equal, enabled pump stations on the same property or multiple properties at any time from a cell phone, tablet, PC or other web-based device or approved network.

iii. The system shall send text messages to select staff for notification of pump failure, fault in the controls or error occurring in the lift station systems.

iv. The system shall allow control of the pump station enable/disable and reset of alarms.

v. The communication hardware shall accept up to eight additional CHOICE CARD inputs

r. Contractor shall provide a heavy-duty industrial grade 75Hx24Wx16D UL Listed, NEMA 4 outdoor rated enclosure to protect electrical control system components. The enclosure shall be custom built to these specifications for this work and specifically for water pumping applications and shall be fabricated of no less than 12GA carbon steel and finished on all inside and outside surfaces in polyester based WHITE powder coat finish for maximum durability. The enclosure shall be provided with heavy duty integral hinges with lift off doors, heavy duty key lockable door handles, continuously welded seams, mechanical interlocks, and drip shield. The electrical component back panel shall be galvanized steel for superior EMC performance.

s. Contractor shall provide a detailed operations and maintenance manual detailing basic system operation, alarms, general maintenance procedures and use of the operator interface. The manual shall be in English and provided in electronic format.

t. All new equipment and connections shall be tested for leaks & sewage pump system proper operation and is required to pass all tests before acceptance. The pump station control panel manufacturer shall conduct and document a complete factory dynamic test of the pump station control panel prior to shipment. Pump station control panel shall be tested throughout the entire operating range at the net discharge pressure called for in the technical specifications. Individual pump pressure, flow, RPMs, volts, amps, KW and power factor shall be documented for verification by the consulting engineer or owners' representative prior to delivery upon request.

i. Final testing will be conducted with the COR and additional Park personnel present. Contractor will ensure select Park personnel are instructed/trained on how the new system(s) work.

ii. Testing may require filling the pit rapidly to ensure float system works as well as the alarm and alert system. The method of filling the pit for testing purposes is the responsibility of the contractor.

u. Contractor to provide warranty on materials and workmanship for a period of two (2) years from the date of acceptance.