All earth excavations shall conform to the lines and grades as shown on the approved final plan. Any change in approved excavations, due to unforeseen sub-surface conditions, shall first be approved by the Public Works Director and the Town Planner to ensure the change does not conflict with any expressed concerns of the Planning Board. Earth excavation shall include, but not be limited to, the removal of clay, sand, gravel, loam, soft or disintegrated rock, which can be removed without blasting, boulders of less than one (1) cubic yard in volume, or one-half (½) cubic yard in all trenches, and other unacceptable materials within the limits of the roadway drainage, or other excavation. Earth excavation shall also include removal of all stumps, backfilling of stump holes and other surface irregularities with suitable fill materials.