| doc-title | Letter to FEMA from consultant URS Corporation |
| quote | The 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 ... |
| source | FEMA consultant URS Corporation |