2008-01-16_APPLICATION CORRESPONDENCE - C2008086

• Permit No: C2008086
• IBM Index Class Name: Application Correspondence
• Doc Date: 1/16/2008
• Doc Name: Preliminary Draft Environmental Impact Statement/Subsidence Appendix A
• Media Type: D
• Archive: No

Table A4. Subsidence Damage Description for Horizontal Strain
(British National Coal Board, 1975)
Class of damage
Change of length
of structure
Description of typical damage
Very slight
or negligible
Up to 0.1 ft
Hair cracks in plaster. Perhaps isolated
slight fracture in the building, not visible
on outside.
Example: 50-ft long building
extended 50 u - in./in.
Slight 0.1 ft-0.2 ft Several slight fractures showing inside
the building. Doors and windows may
stick slightly. Repairs to decoration
Example: 110-ft long building probably necessary.
extended 1.600 u - in./in.
Appreciable 0.2 ft-0.4 ft Slight fractures showing on outside of
building (or one main fracture). Doors
and windows sticking ;service pipes
Example: 90 ft long building may fracture.
extended 3.700 u - in./in. _
Severe 0.4 ft-0.6 ft Service pipes disrupted. Open fractures
requiring rebonding and allowing weather into
the structure. Window and door frames
distorted; floors sloping noticeably. Some loss
of bearing in I-beams. If compressive damage,
overlapping of roof joints and lifting of brickwork
with open horizontal
Example: 220 ft 1 ong apartment fractures.
house compressed 2.300 u - in./in.
Very severe More than 0.6 ft As above, but worse, and requiring partial or
complete rebuilding. Roof and floor beams lose
bearing and walls lean badly and need shoring
up. Windows broken with distortion. Severe
slopes on floors. If compressive damage,
severe buckling and bulging of the roofs and
walls.
Example 180 ft long apartment 6.000 u - in./in.