Conditions of permit. In granting a special permit hereunder, the Board of Appeals shall impose reasonable conditions specially designed to safeguard the neighborhood and the Town, which shall include conditions as to: (1) method of removal, (2) type and location of temporary structures, (3) hours of operation, (5) routes for transporting the material through the Town, (6) area and depth of excavation, (7) distance of excavation to the street and lot lines, (8) steepness of slopes excavated, (9) reestablishment of ground levels and grades, (10) provisions for temporary and permanent drainage, (11) disposition of boulders and tree stumps, (12) replacement of loam over the area of removal, and (13) planting of the area to suitable cover, including trees.