Vehicle access easements serving one or two dwelling units shall be surfaced with crushed rock at least 6 inches in depth.
Vehicle access easements serving more than two dwelling units shall be surfaced with 3 inches of asphalt over 6 inches of crushed rock.
A 2 foot wide shoulder shall be provided on each side for clearance. Easements shall be graded to a crowned cross section with thickened edge or a “v” cross section to provide for collection of storm water. Control of storm water runoff from the easement shall meet the same drainage control requirements as the building lot. The top 12 inches of subgrade shall be prepared as specified in the Seattle Standard Specification 2.06.
Turnarounds must meet the requirements shown in Figure 4-25 or 4-26.