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Planning Commission approves Cox Lab nontraditional wastewater system and Tributary subdivision concept plan
Summary
The commission approved a nontraditional wastewater treatment system for the Cox Lab facility and, contingent on that approval, approved the Tributary concept plan for a 75-lot conservation subdivision at Cox Road; a resident raised maintenance and failure concerns about nontraditional septic systems.
The Williamson County Planning Commission on Thursday approved a nontraditional wastewater treatment and disposal system for the Cox Lab treatment facility and, after that approval, approved the connected concept plan for the Tributary subdivision — a 75-lot conservation subdivision on about 144.84 acres at 6330 Cox Road.
Staff told the commission the Cox Lab site met ordinance standards, that the county wastewater consultant had reviewed and approved the DDR and DSIR, a Certificate of Coverage (CCN) had been issued by the state and a draft SOP was in place. Staff recommended approval of the nontraditional wastewater system with conditions including posting a performance bond for the dispersal and storage pond.
The commission approved the Cox Lab nonresidential site-plan item (Item 36) by voice vote. Planning staff said the Tributary concept plan (Item 39) relies on the wastewater system; staff recommended approval of the concept plan so long as the nontraditional wastewater item was approved.
During the public hearing for the Tributary concept, James Harney of the Triune area asked whether the county tracks failures of nontraditional septic systems and how many were under state review in Williamson County. He said, "I can list 3 right now. But I wonder that these are not properly maintained ... homeowners are at risk of maintaining these systems that have significant cost and significant liability." Staff said they could not immediately provide a county-wide failure count in the meeting and that the question would continue.
Staff noted the Tributary site has significant tree canopy — about 50 percent coverage — with roughly 46 percent of existing tree canopy proposed to remain undisturbed. The plan shows about 103 acres of open space (roughly 76 percent of the site), with lot sizes presented at approximately 47,000 square feet and an overall density of about 1 unit per 0.52 acres. Water service for the subdivision will be provided by Millcroft Utility District; wastewater will be served by the nontraditional system approved as item 36.
The commission approved both items in succession; staff emphasized that concept-plan approval requires subsequent reviews and that outstanding conditions identified in the staff report must be addressed at future stages of development.
