Commission approves Newfield excavation standards allowing deeper man‑made lakes, 4‑1
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Summary
The board adopted an amendment allowing Newfield man‑made lakes to be excavated up to 40 feet under strict safeguards (bottoms must remain 30 feet above a confining unit; <15 ft material restricted to sand), passing the measure 4‑1 after expert testimony on aquifer protection; Commissioner Hurd dissented citing mining and aquifer risk.
The board voted 4‑1 to adopt a text amendment to Article 11 (Planned Mixed Use Village) that adds excavation standards for the Newfield project in western Palm City.
Staff and the applicant said the change applies only within the Newfield regulatory framework and would allow newly constructed, man‑made lakes to be excavated to a maximum depth of 40 feet provided the bottom of the excavation remains at least 30 feet above the confining unit of the Upper Hawthorne Group (the presentation referenced the Upper Hawthorne/bridle terminology used in the staff materials). The proposed amendment also restricts material excavated below 15 feet to sand only, establishes setbacks from rights‑of‑way, property lines, wells and septic systems, and includes sampling, reporting and monitoring requirements consistent with county excavation and fill standards.
Applicant representatives said allowing the developer to obtain fill from on‑site lakes would reduce truck traffic and protect recently completed roadway improvements. James Fitzgerald (vice president of development, Mattamy Homes) argued the approach would reduce wear and tear on Newfield Parkway. Transportation consultant Sean McKenzie estimated as many as 200,000 truck trips would be avoided by sourcing material on site. Engineering witness Bob Higgins described the geotechnical testing performed for the project and cautioned about conate (saline) water and the need to avoid penetrating deeper saltwater layers that could threaten surficial drinking‑water supplies.
Commissioner discussion referenced prior county practice and risks: the chair and several commissioners said other projects had similar approvals, while one commissioner warned that deeper excavation can rapidly become mining and endanger aquifers. The motion to accept staff recommendation passed 4‑1 with Commissioner Hurd recorded as the lone dissent.
The ordinance text amendment was adopted; implementation will require project‑level permitting, sampling and compliance with the monitoring thresholds specified in the adopted standards.