1. ASTM (American Society for Testing Materials) (2014) D7949: Standard test methods for thermal integrity profiling of concrete deep foundations. ASTM. West Conshohocken, PA.
2. ASTM (2016) D5882: Standard test method for low strain impact integrity testing of deep foundations. ASTM, West Conshohocken, PA.
3. ASTM (2017) D6760: Standard test method for integrity testing of deep foundations by cross-hole testing. ASTM, West Conshohocken, PA.
4. ASTM (2021) D6026: Standard practice for using significant digits and data records in geotechnical data. ASTM, West Conshohocken, PA.