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Nixa approves cost‑share for regional detention basin tied to new police station; city to cover geosynthetic liner
Summary
The Nixa City Council on July 22 authorized a cost-share agreement for a regional detention basin that will serve the new police station and adjoining property and approved city payment of up to $150,000 for a geosynthetic liner to mitigate sinkhole risk.
The Nixa City Council on July 22 approved a cost-share agreement with Extreme Property Holding Holdings LLC to construct a regional detention basin that will serve the new police station site and adjacent development. The city will reimburse the developer 20% of basin construction costs up to $30,000 (reflecting the police station’s proportional contribution) and will pay the full cost of a required geosynthetic liner up to $150,000.
Project staff explained the cost-share structure during discussion. The basin will collect stormwater runoff from the police station property (5.34 acres) and from the developer’s property (about 23.52 acres); the 20% share reflects that acreage split. Staff said the liner is required because the basin will be located near an identified sinkhole (referred to as “sinkhole D” in the site study). The liner is intended to prevent seepage into the sinkhole rim and to avoid destabilization that could propagate toward the police station site.
The project facilitator said the liner will channel stormwater to the designed outlet structure for the basin and avoid seepage into the sinkhole system. Staff also said the liner cost has been included in contingency estimates for the police station project. Council asked how close the sinkhole is to the proposed basin and to the police station parcel; staff walked members through the site illustrations and described the sinkhole locations and contours on the engineering maps.
Formal action: resolution 2025-37 authorizing a cost-share agreement for a regional detention basin was moved by Councilmember Joanne Graham, seconded by Councilmember Aaron Peterson, and approved by council. The agreement includes (1) a 20% reimbursement to the developer, Extreme Property Holding Holdings LLC, for the basin cost up to $30,000, and (2) city payment of geosynthetic liner costs up to $150,000 to prevent sinkhole-related seepage.
Staff said the basin and liner are included in the overall police station project budget and contingency planning; construction and final cost allocation will follow standard project controls and invoicing under the cost-share agreement.
