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Balch Consolidation Conduit Project
tunnel separation plant
Tunnel Separation Plant
  Cutter Soil Mix Machine
Cutter Soil Mix Machine
Project Name:
Balch Consolidation
Conduit Project
Location:
Downtown Portland, Oregon
Project Dates:
June 2009 – December 2011
Project Value:
$57 Millions
Owner:
City of Portland
SIS Assisting:
Contractor: James W. Fowler Co.
Type of work:
Shaft and Microtunneling Work

Sideview MTBM 84-dia
Sideview MTBM 84-dia

    Shaft C Ringwall Installation
  Shaft C Ringwall Installation
Project Scope of Work

The Batch Consolidation Conduits is part of Portland’s 20 year program to control combined sewer and stormwater overflows to the Willamette River.
The work includes the construction of six tunnel access shaft sites. The tunnel shafts will be used to launch and retrieve the microtunneling boring machine (MTBM) and future maintenance access.  The shafts range from 23 to 33 feet in diameter and will be 40 to 72 feet deep.
Two MBTMs (84” & 54” in diameter) will tunnel and install most of the 8500 feet of pipeline at depths ranging from 20 to 70 feet.


Shaft B Excav with Manbasket

Shaft B Excav with Manbasket
SIS Scheduling Scope of Work:

  • SIS built the successfully submitted and approved CPM baseline schedule.
  • SIS provides the full time lead scheduler for this project to maintain the as-built schedule.
  • SIS provides 3-week-look-ahead schedule for the weekly meeting.
  • SIS provides monthly schedule analysis and reports, and SIS heads the review meeting with the contractor and owner.
SIS provides mid-month schedule forecast for cash advance payment



Software Utilized: Primavera, P6 version 6.2.1

   MTBM 84-dia Shaft B CSM Cutterhead close-up 2          
MTBM 84-dia Shaft B CSM cutterhead close-up 2

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