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the URS Corporation letter questioning UC Berkeley

URS says that deep mulch is a risk for spontaneous combustion

doc-titleLetter to FEMA from consultant URS Corporation
quoteThe recommended depth for landscape mulch is less than 4 inches (Appleton and French 1995) to avoid stifling growth of remaining trees and to avoid spontaneous combustion that can occur when decomposition of organic materials creates enough energy in a pile to ignite a fire. ... A thorough literature search did not identify any studies documenting decomposition rates in eucalyptus mulch deeper than 4 inches ...
sourceFEMA consultant URS Corporation