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2. ASTM D1452 (2000). Standard Practice for Soil Exploration and Sampling by Auger Borings, D1452, ASTM International, West Conshohocken, PA, USA.
3. ASTM D1586 (2000). Standard Test Method for Penetration Test and Split Barrel Sampling of Soil, D1586, ASTM International, West Conshohocken, PA, USA.
4. ASTM D4719 (2000). Standard Test Methods for Prebored Pressuremeter Testing in Soils, D4719, ASTM International, West Conshohocken, PA, USA.
5. ASTM D5778 (2012). Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing of Soils, D5778, ASTM International, West Conshohocken, PA, USA.