LAND USE
SUGGESTED LAND USE COMPATI
SLUCM No . Land Use Name DNL 65-69 DNL 70-74 DNL 75-79 DN 83 Forestry activities Y 8 Y 9 Y 10 84 Fishing activities Y Y Y 85 Mining activities Y Y Y 89 Other resource production or extraction Y Y Y Source : Air Force Instruction AFI32-7063 , Rev . December 2015
Key : SLUCM – Standard Land Use Coding Manual , U . S . Department of Transportation Y ( Yes ) – Land use and related structures compatible without restrictions . N ( No ) – Land use and related structures are not compatible and should be prohibited . Y x – Yes with restrictions . The land use and related structures generally are compatible . However , see note ( s ) indicated by the superscript . N x – No with exceptions . The land use and related structures are generally incompatible . However , see note ( s ) indicated by the superscript .
25 , 30 , or 35 – The numbers refer to noise level reduction ( NLR ) levels . NLR ( outdoor to indoor ) is achieved through the incorporation of noise attenu construction of a structure . Land use and related structures are generally compatible ; however , measures to achieve NLR of 25 , 30 , or 35 must be in construction of structures . However , measures to achieve an overall noise reduction do not necessarily solve noise difficulties outside the structure an warranted . Also , see notes indicated by superscripts where they appear with one of these numbers .
DNL – Day-Night Average Sound Level . Ldn – Mathematical symbol for DNL . 1 . General
a . Although local conditions regarding the need for housing may require residential use in these zones , residential use is discouraged in DNL 65-69 a 70-74 . The absence of viable alternative development options should be determined and an evaluation should be conducted locally prior to local appr demonstrated community need for the residential use would not be met if development were prohibited in these zones . Existing residential developme incompatible land uses .
b . Where the community determines that these uses must be allowed , measures to achieve outdoor to indoor NLR of at least 25 decibels ( dB ) in DNL should be incorporated into building codes and be considered in individual approvals ; for transient housing , an NLR of at least 35 dB should be incorp
c . Normal permanent construction can be expected to provide an NLR of 20 dB , thus the reduction requirements are often stated as 5 , 10 , or 15 dB o normally assume mechanical ventilation , upgraded sound transmission class ratings in windows and doors , and closed windows year round . Addition to modifying NLR levels based on peak noise levels or vibrations .
d . NLR criteria will not eliminate outdoor noise problems . However , building location , site planning , design , and use of berms and barriers can help m particularly from ground level sources . Measures that reduce noise at a site should be used wherever practical in preference to measures that only pr
Background Report