SITE WORK - ARE Forum

Auger borings: most effective in sand or clay, bring up soil samples of 2 to 2.5 in. auger. Up to 50 feet. Wash borings: used when soil too compact to use auger. Water is forced through a 2-4 in. pipe. 100 feet or more. Core borings: most reliable. A diamond drill can penetrate through all materials, depths, and bring up complete cores of material. ................
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