[greenyes] FW: Conversion Factors

["DONNAWAY Jay" <Donnaway.Jay@no.address>]

Random load sampling would certainly be the best way to come up with a
local average for yard debris-derived mulch density.  For the annual
Oregon Materials Recovery Survey, we provide the following conversion
factors to compost operators (who often lack scales) as a starting
point. 

Material				density in pounds per cubic yard
Grass clippings 			40-1500
Leaves				250-500
Loose Yard Debris			250
Compacted Yard Debris		640
Wood collected at landfills	250
Green Wood Chips 			473
Dry Wood Chips			243
Cordwood				500
Christmas Trees			30

These figures were compiled from numerous local and national studies,
but were last updated two years ago.  

Jay Donnaway
Sr. Solid Waste Policy Analyst
Oregon Dept of Environmental Quality
Land Quality Division
811 SW Sixth Avenue
Portland, OR 97204-1390
(503)229-6046
Fax: 229-6977
donnaway.jay@no.address
http://www.deq.state.or.us