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Grass Valley considers Forest Service carbonizer for spring green-waste program
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Summary
City staff outlined a proposed spring green-waste collection using a Forest Service-provided carbonizer/air-curtain incinerator (ACI) to process woody material at limited sites, aiming to reduce hauling and chipping costs and produce a biochar-like product for local use.
City staff outlined a proposed spring green-waste program on Jan. 13 that would use an Air Curtain Incinerator (ACI), described in the meeting as a Forest Service-supplied carbonizer (referred to in the hearing as a 'charboss'), to process woody material brought by residents at designated drop-off points.
Tim, the city manager, described the Forest Service offer as an opportunity to provide residents a free way to dispose of woody debris — branches, brush and other woody material — without the city having to chip and haul material off-site. ‘‘They are offering to us a curtain burner, basically, for free to share,’’ he said, describing a program similar to a previous post-storm pickup where the city collected debris at the curb and later chipped and removed it.
Operational plan and partnerships: Staff said the plan would designate several neighborhood drop-off locations with contractor pickup and a trained operator at the ACI; the U.S. Forest Service would support training and the city has reached out to local partners, including the Resource Conservation District and neighboring Nevada City, to share crews or access for residents. A Forest Service representative said many units nationwide have not been used and the agency is open to training local operators.
Environmental and permitting notes: Staff and the Forest Service liaison said air-quality impacts are expected to be minimal; the product is described as a low-smoke biochar-like material suitable for use on roadsides or other municipal applications. Staff said they have submitted permitting paperwork and expect limited air-quality concerns.
Budget: Tim proposed using money allocated in the grants-for-fuel-reduction line (previously shown as $250,000 on the midyear sheet) and suggested approximately $200,000 as an initial budget for the spring pickup while leaving $50,000 in reserve. He said the prior program during 'Snowmageddon' cost roughly $200,000 and that the ACI approach could reduce chipping and hauling costs.
Next steps: Staff will refine the program design and return to the City Council with specifics, including exact locations, schedules and permitting details before any expenditures are made.
