GLENEDEN SANITARY DISTRICT - IMPORTANT NOTICE PUMP STATION & FORCE MAIN IMPROVEMENTS PROJECT SUMMARY

GLENEDEN SANITARY DISTRICT - IMPORTANT NOTICE PUMP STATION & FORCE MAIN IMPROVEMENTS PROJECT SUMMARY

PROJECT BACKGROUND

Gleneden Sanitary District operates and maintains a sewer system that includes 16 pump stations, about 110,000 feet of pipe, and 390 manholes.  The system began operation in 1976 and currently serves Gleneden Beach, Coronado Shores, Lincoln Beach, and nearby developments. The collected wastewater is pumped to the Depoe Bay sewer system for treatment before being discharged to the ocean.

PROJECT DESCRIPTION

In 2018 the District completed an update to their Facilities Plan.  This updated plan identified  the  pump  station  (PS)  and  pipeline  improvements  described  below  as  high  priority  capital improvements.  Numbers below in parentheses correspond to the numbering key on the attached map.

PS Replacements — Laurel Street (1) and North Coronado (2)

This part of the project will replace two aging, corroded, and obsolete pump stations with upgraded facilities located on the same sites. The new facilities will have expanded capacities to meet Oregon Department of Environmental Quality design guidelines.  Major components at each site will include:

  • A below-grade pump well with two non-clog, submersible pumps.
  • Below-grade vaults containing pressure piping, valves, a flow meter, and a bypass connection.
  • A  new  CMU  building that  will house  a  standby  power generator,  PS  control systems, and  other electrical equipment.

North Coronado Pipeline {Pressure Main) Replacement (3)

The existing 6-inch pressure main for the North Coronado PS will be undersized for the new PS capacity and must be replaced with an 8-inch main approximately 4,100 feet in length.  The new pressure main will terminate at a new MH near Hwy 101 and Lancer St.  Work will be in existing public rights of way.

PS Renovations — Seagrove North (4) and Seagrove North (5)

This work will involve renovations to the two worn-out and unreliable pump stations that serve the Seagrove development.  Major upgrades at each site will include:

  • Renovation  of the  existing  below-grade  pump  well,  including  the  installation  of two  non-clog, submersible pumps.
  • New below-grade vaults containing pressure piping, valves, and a bypass connection.
  • Aboveground cabinets housing PS control systems and other electrical equipment.
  • A large plug (receptacle) for connecting a portable, standby generator.

Control  System  Upgrades  at  Other  Pump  Stations  (6)

This  work  will  include  the  following improvements:

  • PS Controls — Replace electronic control systems at five additional PS sites.
  • Remote PS Monitoring — Add new transmitter devices at four additional PS  sites to allow remote monitoring of PS equipment on a secure website through a cellular-service provider.

OBJECTIVES

The project is intended to meet the following main objectives:
  • Improve reliability and reduce the risk of sewage overflows, thereby reducing public health hazards and the risk of polluting nearby wetlands or creeks.
  • Reduce maintenance requirements and eliminate safety hazards that workers currently face.
  • Reduce hazards from obsolete electrical components that do not meet current electrical code.

PRELIMINARY  COST  ESTIMATE

The  probable  project  cost  is  estimated  to  be  $4,175,000  assuming  a construction start date in 2020 and completion in 2021.
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