Board recommends amendment to Henske Subdivision agreement: require 4‑inch asphalt and top layer after 80% buildout

The Board of Public Works voted June 2 to recommend that the City Council approve an amendment to the development agreement for the Henske Subdivision that increases the required asphalt thickness from the previously used 3 inches to a 4‑inch pavement structure and ties installation of the top surface course to an 80% buildout threshold.

Robert (Public Works staff) and Chad (Public Works staff) explained that the standard for newer subdivisions has shifted toward a 4‑inch total asphalt thickness — typically configured as a 2.5‑inch binder layer placed now and a 1.5‑inch surface course applied later after heavy construction traffic passes. Chad said the binder layer should be installed early and the surface mat applied after most homes are completed to avoid damage from construction vehicle traffic.

The board discussed costs and a proposed escrow approach to avoid asking the developer to pay the full higher price immediately. Staff described approximate cost figures presented at the meeting: the transcript listed a 3‑inch option near $57,000 and a 4‑inch option near $78,000, leaving an approximate difference of $21,000 to be held or managed by the city and paid later when the surface mat is placed. Chad told the board he and Robert would insert a timeline clause (staff suggested an 80% buildout trigger) into the draft amendment before forwarding it to council.

Board member Ritchie moved to approve and recommend the development agreement amendment including an 80% completion trigger; Barrington seconded the motion. The board voted to recommend council approval; the matter will return to Council for final action and the council may adjust the precise percentage or terms before finalizing the agreement.

Jeff Henske (developer) had been reviewing costs and requested an insertion of a sunset or timing clause to ensure the top layer would be placed within a reasonable time after most houses were built.

The amendment as recommended would require the binder layer to be installed now and the top surface layer to be applied later once the agreed completion threshold is met; staff indicated the escrow or similar account would hold the difference in today's dollars and account for inflation or cost changes when the top layer is placed.

The board’s recommendation is a pre‑council action; the city council will consider the amendment language and final timing when the item is before it.