Analytical testing is performed in laboratories which are accredited by the appropriate regulatory agencies or independent accreditation organizations. StanTech adheres strictly to EPA quality control procedures, ensuring that samples are collected properly and are representative of the conditions at the source. Work Plans, Sampling and Analysis Plans, and Contractor Specifications are prepared, as deemed necessary for a specific project or task, to ensure quality control. Analytical data collected for each project are tabulated and checked for accuracy against laboratory analytical results, and laboratory Quality Assurance / Quality Control data are reviewed. Statistical analyses are conducted for data sets, as required by each specific project.