INTERRA was selected to serve as a subconsultant to Burns & McDonnell to provide Quality Assurance services for these Peoples Gas projects. INTERRA provided a variety of services for this project which began in 2016. INTERRA conducted testing and inspection for concrete, aggregates, and soil. Services provided included soil and aggregate compaction testing, footing inspections, and trench backfill. INTERRA provided inspection and testing of welds, steel joists, and tested bolted connections. Other services included Proctor and grainsize analysis. INTERRA conducted inspection for vapor barrier installation. For concrete, INTERRA completed testing which consisted of cylinder compressive strength, air content, slump, and performed floor flatness and levelness testing.

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