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Planning commission requires drainage study, approves five‑year review for CinderLyte extraction operation
Summary
After public comment about drainage and road impacts, the commission approved the five-year review of CinderLyte’s special use permit with two added conditions requiring a drainage study and construction of any necessary drainage improvements before November 1, 2025.
The Carson City Planning Commission on June 25 approved the five-year review of a previously approved special use permit for expanded extraction operations at the CinderLyte site on Go Nye Road, adding two conditions requiring a drainage study and the construction of any necessary drainage improvements ahead of the wet season.
Heather Farris, senior planner, outlined the history: a 2004 special use permit (expanding an operation originally permitted in 1975) contained 25 conditions and annual reviews; in 2020 the commission modified the permit and removed condition 14 after payment was received for earlier mitigation. Farris said staff discovered an error in the draft finding referencing a deleted condition and recommended removing that reference; staff also proposed two new conditions to address public concerns about storm drainage.
The two added conditions read in staff materials are: (1) prior to Oct. 1, 2025, the operator must submit a drainage study to the city engineer that compares current operations to the site’s predevelopment condition (June 2004) and demonstrates the extraction operation will not increase runoff for the design storm or provide appropriate on-site retention/detention; and (2) if the study requires drainage improvements, they must be permitted and constructed prior to Nov. 1, 2025.
Stephen Pote, development engineering, described the site’s drainage context and noted a depression on-site that holds water; he said the city will also be reviewing regional stormwater planning and that the proposed conditions will require an engineer analysis to conform with today’s standards. Pote addressed a related road-repair issue: CinderLyte previously paid $125,712 toward Goni Road improvements; funds were used in part to repave a different segment when the city allocated pavement funding to other sections, and the city plans larger resurfacing in 2026.
Greg Lehman, representing CinderLyte, said the company already conducts an annual aerial survey (fly) and has a storm-water permit (NDP) and that the operation has reduced stormwater impacts in some ways; Lehman said he would accept the added conditions and provide the requested documentation. Commissioners and nearby residents expressed concern about the condition of Goni Road and the local history of drainage and sediment issues. Resident Carol Grenier, a retired civil engineer, urged the city to include local expertise in broader drainage planning.
Commissioner motioned to approve the five-year review as amended with the staff memorandum of June 20, 2025 and with conditions 27 and 28 requiring the drainage study and any necessary improvements; the motion passed by voice vote.
The two new conditions are intended to ensure a technical assessment of on- and off-site flows, require mitigation where needed, and set a timeline aiming for construction before the wet season.
