Internal QA/QC Prairie North Const. Ltd.'s internal QA/QC procedure is based on the selection of a project-specific QA/QC team that develops and implements the internal QA/QC plan. Informal QA/QC Prairie North Const. Ltd. prefers to develop and implement an informal, interactive Owner-Contractor quality control team (QCT) for each major earthworks project. External QA/QC Prairie North Const. Ltd. Const. Ltd.'s external quality assurance program is developed to comply with construction industry requirements for Quality Assurance Project Plans.