Retaining Walls, Tanks, Pools, Dams & Sewers

Drawings, or just depth, wall length and a few photos of the lot.

Retaining walls. The engineer of record designs the wall. The shotcrete work follows the project specification, which typically draws on CSA A23.1/A23.2 for concrete and ACI PRC-506-22 for shotcrete practice.
Tanks and liquid-containing structures. ACI CODE-350-20 covers the design, materials and construction of concrete structures that convey, store or treat water, wastewater and other liquids, with liquid-tightness as a service requirement. It includes provisions for applying shotcrete. Your engineer decides whether it applies.
Pools. ACI PRC-506.8-24, Shotcrete Use in Pool Construction—Guide, is written for owners and pool builders. It gives recommendations for planning, design and construction, but it has no specific design requirements. Those come from your pool designer or engineer.
Public pools in Alberta. Under the Public Swimming Pools Regulation (AR 204/2014, s. 7(3)(l)), a permit application for a new public pool must include design plans reviewed and stamped by a professional engineer or architect, along with a Safety Codes Act permit where one is required.
Who decides. For retaining walls, tanks, pools, dams and sewers, the engineer of record and the authority having jurisdiction set the requirements. Enviro Shield places the shotcrete to the approved drawings and specifications.