This standard covers the construction of water wells ranging in nominal diameter from 8 in. (200 mm) through 30 in. (750 mm). Certain minimum requirements are presented that can be incorporated by reference into the purchaser's specifications. This standard is intended for large municipal and industrial wells that are constructed using normal well-drilling techniques. Major topics covered are: investigation of geologic/hydrologic conditions and groundwater quality; construction; well casings; well screens; gravel pack; grouting and sealing; plumbness and alignment; well development; performance testing; well disinfection; water quality testing; and abandonment of test holes, partially completed wells, and completed wells. Appendices cover gravel pack installation methods, grouting and sealing methods of placement; plumbness and alignment procedure for testing; methods of measuring operating parameters during development, water sampling; factors influencing the duration of pumping test; abandonment of test holes, partially completed wells, and completed wells; geophysical bore-hole logs; types of wells; and collapse strength of well casing.