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Draft mandates full removal below ground, soil restoration to pre‑construction CSR and a 150% surety bond
Summary
The decommissioning chapter now requires removal of all structures including underground components (with an owner waiver option), restoring soil to at least 95% of preconstruction corn suitability rating (CSR) and a surety bond (150%) to assure decommissioning and cleanup; board asked to clarify waiver recording and contamination liability.
Staff reviewed major decommissioning changes intended to ensure sites are fully restored if a project is removed, abandoned or damaged.
The presenter said the draft now requires removal of all structural components including the entirety of below‑ground structures, although a participating property owner may sign a case‑by‑case waiver at the time of decommissioning. The county may decline to record such a waiver as a permanent instrument unless the parties choose to do so.
Soil restoration is emphasized: disturbed areas must be graded, reseeded and restored to predevelopment condition, with a specification that the corn suitability rating (CSR) after restoration should be no less than 95% of the preconstruction CSR for the same location. Staff added requirements for baseline photos and documentation of soil characteristics before development and confirmation after decommissioning.
Financial assurances were discussed at length. The draft specifies a surety bond (not another form of security) sized to cover no less than 150% of estimated decommissioning costs; the board scaled that figure down from prior higher multipliers during the meeting. Staff also proposed that if documentation submitted by the owner does not meet ordinance standards, the county may conduct independent verification at the owner's expense.
Public commenters raised practical concerns about soil scarcity (high CSR topsoil), spread of fiberglass in fires, and whether owners of neighboring, nonparticipating land would be made whole if contamination or debris falls onto their fields. Staff said damage, contamination and penalties assessed by state agencies such as the Iowa DNR should be addressed and that they would research how the county can require operators to cover environmental cleanup without conflicting with state rules.
Next steps: staff will add clarifying language about waivers, documentation, verification procedures and environmental liability and will include a matrix outside the ordinance text to summarize timelines (30 days for above‑ground mitigation, 365 days for removal in ordinary conditions) to aid review.
