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Fourteen scenes for the numbers a site crew uses: trench yards, truck loads, slope runs, depth triggers, compaction and drainage. Move a slider and the dirt moves with it. Each scene shows the work with your numbers, tags every value that still needs checking, and gives you practice questions.
Geometry and arithmetic are exact. Safety, soil and code values come from the pages below, some of them third-party mirrors of the code, so confirm them with County Building & Safety (Montecito is unincorporated Santa Barbara County; the fire, water and sanitary districts set their own rules) and the project's soils report before you dig, order or permit. Scenes are drawn simplified and not to scale; exaggerations are labelled.