Mine Subsidence Protection Program Page 2

How can I find out more about the risk to my property?
Contact the Colorado Subsidence Information Center at the Colorado Geological Survey, 1313 Sherman St. #715, Denver, CO 80203 or call 303/866-2611.

Who is eligible to participate?
Any Colorado homeowner whose residence was built prior to February 22, 1989 and has been identified as being in a subsidence prone locale.

What areas are affected by subsidence?
There are nearly 50,000 acres undermined along the Front Range corridor, in Boulder, El Paso, Jefferson and Weld Counties, as well as Fremont, Huerfano and Las Animas Counties. Coal mining took place from the late 1860s until the 1930s, and in some cases into the 1950s. More than 7,500 homes have been built over mined lands and 25,000 residents could be affected.

What are the effects of subsidence?
Subsidence causes cracks in foundations and walls, doors to sag and stick, walls to bulge or crack, walls and floors to separate, stairs and stoops to pull away from buildings, utility line damage, and in severe cases, holes to open up under buildings and in yards and gardens. However, some cracks and shifts are not subsidence, and frequently are caused by expansive clay soils, poor backfill compaction, improper drainage and poor construction.

Why was building allowed to take place over abandoned coal mines?
Until a state law was passed in 1972, there was no requirement that any type of review of geologic hazards, including mined areas, be conducted. A lack of awareness of underground mine locations, and rapid growth in some cities and suburbs also contributed to inadequate planning, surveying and engineering for homes and subdivisions.

What types of structures will be covered under the Program?
The Program will cover the primary residence, attached decks, patios, stoops and guest houses. Multi-residential complexes, up to 8 units, are also covered (all units in the structure must participate in the Program). "Structure" means any residential dwelling, building or fixture, including basements, footings, foundation, septic systems and underground pipes and utilities on the property. It does not include driveways or sidewalks.