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Staff presents Wallace Group 30% design comparing gravity and STEP collection
Summary
Staff and the Wallace Group presented a 30% design comparison of gravity and STEP collection systems, discussing technical feasibility, capital cost estimates and 30-year owner cost calculations to guide the board’s selection.
The Wallace Group’s 30% design delivered to the board compared two collection approaches (gravity collection vs STEP/pressurized collection) and two conveyance approaches (gravity conveyance to Solvang or pump conveyance). Staff walked the board and public through slides summarizing technical tradeoffs, capital costs and lifetime owner costs.
According to staff’s presentation, a table in the Wallace Group report showed construction capital values with a larger figure in one table itemized near $51,000,000 for the gravity collection scenario and approximately $38.6 million for the STEP scenario in that table. Staff also highlighted 30‑year property‑owner cost calculations presented in the report (about $88,000 per EDU for gravity and just over $97,000 for STEP, per the Wallace table). "So that's what is in the Wallace Group report," staff summarized when presenting the slide deck.
Staff emphasized that gravity conveyance to Solvang is technically feasible and could eliminate lift stations and reduce odor and footprint concerns, but that county review will be required on some permit issues (for example, where gravity lines would be located). The presentation framed the numbers as preliminary (30% design) and part of an apples‑to‑apples study meant to inform the board’s subsequent selection and more detailed design.
