Planning commission backs conditional approval for Norman Ranch 8-inch force main

The Summerset planning commission on Nov. 12 voted to recommend city council approval of a developer’s request to install an 8-inch force main for the Norman Ranch subdivision, but the endorsement is conditioned on several contingencies intended to protect the city if the system underperforms.

Megan Kingsbury, representing Anoka Development, told commissioners the project would bring infrastructure across the interstate and allow the city and region to capture growth opportunity on the other side. "We are here bringing the Fort E. Norman Ranch subdivision this evening," she said, and identified the two items before the commission as the design exception and the preliminary plat.

Why it matters: HDR engineering staff and city technicians warned the existing Summerset (Camping World) lift station is at or near capacity and that an undersized force main can produce low velocities that allow solids to settle in the line and increase maintenance. Chris Robinson of HDR summarized the technical concern as "the 2 big issues... organized development is not continuous... that requires, of course, may need to pump waste water back into the existing collection system in the city," and stressed that lower velocity in a long force main can be problematic.

Developer case and mitigation: Kyle Trellor, joining by Zoom for the developer team, said the developer’s request is to "allow us put in that, larger force main right now." He said the build would include a pigging station and other measures to clean the line: "With it, we're putting in a pigging station and running some extra water so that we can mitigate... deposition." Trellor added the developer negotiated a two-year warranty in the developers' agreement and offered to extend warranty or acceptance terms to provide additional assurance if commissioners required it.

Technical details discussed: HDR flagged two principal concerns — the velocity in the force main (HDR referenced a 2 feet-per-second design guidance) and the downstream capacity of the Camping World lift station. Commissioners and engineers discussed tradeoffs between a 6-inch and 8-inch main, the proposed pump size (discussed around an 80 gallons-per-minute pump), the possibility of a parallel main and an estimated roughly $2,000,000 cost to run a parallel force main during a later phase if the city required that route. HDR noted that up-sizing a pump or changing wet-well size may require electrical and structural changes to the lift station.

Testing, contingencies and timing: Staff described missing or malfunctioning air-release valves and recommended field tests (flow meters, pump testing and valve replacement) to quantify existing capacity. The developer said phasing and financing require movement now to remain eligible for grant funding and that the typical build schedule would put roughly 40 lots online in the first year and an 18-month initial build-out. "If if we stop moving, then then none of this happens essentially," the developer said, stressing grant timelines.

Commission action: After discussion the commission moved to recommend approval of the design-exception request and the preliminary plan, but only with contingencies discussed at the meeting: extend the developers' warranty/acceptance period (the developer proposed three years), confirm that replaced air-release valves materially increase available flow before final acceptance, and put in writing a contingency plan between the city and developer for actions if the system is overloaded (including responsibility for upgrades or interim mitigation). The motion explicitly made final approval contingent on U.S. Army Corps (wetland/drainage) sign-offs where required. The commission voted "Aye" to forward the recommendation to city council.

What happens next: The recommendation goes to the Summerset city council for final action. The developer and HDR agreed to supply additional flow-testing data and to work with city staff to draft contingency language to be included before the council vote.

Quotes from the meeting reflect participants’ words as recorded in the meeting transcript. The meeting record shows the commission sought written contingencies and more measured field data before committing to final acceptance of physical infrastructure.