Aux Sable Pipeline Replacement – Phases 5-8

  • Aux Sable Pipeline Replacement – Phases 5-8
  • Aux Sable Pipeline Replacement – Phases 5-8
  • Aux Sable Pipeline Replacement – Phases 5-8
  • Aux Sable Pipeline Replacement – Phases 5-8

Overview

Client: Nicor Gas / Southern Company Gas

Location: Warrenville, IL to Unincorporated Will County

Description

As part of investing in Illinois, d’Escoto provided various construction inspection services for Phases 5–8 of the Aux Sable pipeline replacement—a Nicor gas system improvement initiative to modernize the aging natural gas infrastructure and enhance the system’s safety and reliability. Approximately 20 miles of a 36-inch natural gas transmission pipeline was retired and replaced with new, state-of-the-art pipe, AC mitigation systems, and the existing 36-inch mainline valves were retired and upgraded during the following four phases:
• Phase 5 —6.87 miles (Plainfield, through Joliet, to Shorewood): installation of 36-inch pipe with AC mitigation system and 36-inch mainline valve
• Phase 6 —5.69 miles (south of Shorewood, through Unincorporated Will County, to Minooka): installation of 36-inch pipe with AC mitigation system and two 36-inch mainline valves
• Phase 7 —7.1 miles (Minooka to Unincorporated Will County): installation of 36-inch pipe with AC mitigation system and two 36-inch mainline valves; completion of railroad work
This contract was extended to include Phase 8.
• Phase 8 —0.5 miles (in front of Aux Sable Liquid Plant, Unincorporated Will County): installation of 36-inch pipe and 36-inch mainline valve at Station 98

Services Provided

Under multiple contracts, d’Escoto inspected the construction, installation, and commissioning activities performed by Nicor’s construction contractor. d’Escoto’s experienced team of qualified inspectors included:
• Chief Inspector—Conducted overall management of the inspection team and was responsible for the successful delivery of each project phase. Monitored, reported, and assisted with questions regarding contractor and inspector services; provided master daily reports for client review
• Corrosion Inspector (CP 2 Registration)—Performed on-site inspections, testing, and documentation of constructed cathodic protection and AC mitigation systems
• Office Manager—Provided back-office support to the chief inspector. Tasks included finalizing, filing, and loading reports to SharePoint, organizing binder documentation, and managing timecards, field equipment, and project supplies
• Weld Inspectors (AWS Certified)—Inspected each weld joint to verify that a sound weld was produced, proper welding procedures were implemented, and work was performed by qualified welders; Verified other contractors examined every weld joint for compliance to API 1004 specifications and each weld passes non-destructive testing
• Coating Inspectors (NACE Level 1 Certified)—Inspected pipe and weld coatings for defects and damage prior to all backfills, HDD pull-throughs, or jack and bores; verified field-applied pipe coating met Nicor’s mill thickness and manufacturer’s hardness specifications; verified coating was protected during installation and not damaged during pull-through activities
• Utility (General) Inspectors—Performed continuous, daily oversight of individual project segments to verify construction adhered to schedule, design, and specifications; ensured compliance with all permit and JULIE requirements; validated environmental best management practices were followed in accordance with permits and construction plans; and coordinated construction activities with landowners as needed