Since 2010, NTH has participated in the Detroit Water and Sewerage Department (DWSD) Hubbell-Southfield Combined Sewer Overflow (CSO) Basin facility rehabilitation project. Throughout this project, NTH has provided engineering services for structural repair and improvements to the CSO Basin facility.
Project Scope In 2011, NTH completed a structural evaluation of the Process and Headworks buildings. This task involved extensive condition observations and assessment of both buildings in their entirety.
The following systems and building components were included in the assessment:
Assessment of representative areas of the floor slab, walls, and roof structure of both buildings.
Review of findings of preliminary assessment to determine possible causes of observed distress and develop scope of needed evaluations.
Re-evaluation of locations previously determined to have multiple deficiencies, including locations to be reached with ladders, scaffolding, and man lifts.
Conducting several inspections of openings of the masonry walls to determine as-built conditions of the walls.
Locating joint reinforcing within walls utilizing an R-meter to determine as-built conditions of the walls.
Inspection of connections between roof truss and masonry walls within the Headworks Building.
Sounding of the concrete around openings within the floor slab of the Headworks building.
Following the inspection, NTH provided design services to address deficiencies observed during the evaluations. These services included:
Developing repair details.
Developing repair location plans.
Developing provisional, technical and supplemental specifications to the DWSD Master Specifications as necessary
NTH is currently providing construction observation services, including:
Attending design meetings with METCO and / or DWSD
Providing bid assistance by answering bidder’s questions
Providing bid assistance by preparing Issued for Construction documents
Reviewing submittals as requested
Assisting in answering RFI’s
Attending construction meetings with METCO and / or DWSD