Admin Order 58-02-25-F - Laserfiche WebLink

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EXHIBIT A MINIMUM REQUIREMENTS FOR NUMBER AND SPACING OF PITS AND BORINGS FOR SAMPLING SOilS AND ROCK Number and spacing of Level 2 sampling pits or borings and Level 3 test borings should conform to the following guidelines. For Level 3, the Geotechnical Engineer will select the locations of borings and the type, freq uency, and depth of samples and/or field strength tests. Guidelines for Spacing of Borings I Maximum distance between borings, feet Project Horizontal stratification of soil or rock Minimum number of borings Uniform Average Non-uniform Multi-story buildings 150 100 50 4 per structure One or two-story buildings 200 100 50 3 per 1 structure Land divisions, development site 500 200 100 2 per acre 4 or less acres Land divisions, development site 500 200 100 Minimum 8 per site with 3 4 or more acres per soil unit Bridge piers, abutments, 100 100 25 television towers, etc. Roadways, sewers, pipelines 1000 500 200 - 100 Borrow pits 500 200 100 - 50 (for compacted fill) Earth dams, dikes 200 100 50 Space preliminary borings 200 to 500 feet apart so that the area between any four New site of wide extent borings includes approximately 10% of the total area. In detailed exploration, add borings to establish geological sections at the most useful orientation. Development of site on soft Space borings 100 to 200 feet at possible building locations. Add intermediate compressible strata borings when building site is determined. Low-load warehouse building or Minimum of 4 borings at comers plus intermediate borings at interior foundations large area sufficient to define subsoil profile. Slope stability, deep cuts, high Provide 3 to 5 borings on line in the critical direction to provide geological section for analysis. Number of geological sections depends on extent of stability embankments problem. For active slide, place at least one boring up slope of sliding area. Page 1 of2