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<br />COLO. TECH. CENTER <br />CONT'D <br /> <br />Also, what would be the risk to a person <br />who built or uses that property? We <br />have tried to equate this as the same <br />principles that are used in flood control, <br />or in flood plain zone so that you people <br />would understand. You can never say there <br />is no risk. The probability of getting <br />hit by lightning if you walk out into the <br />street is very low. But you can't say <br />there isn't some risk of being hit by <br />lightning, so you always have some risk. <br />We try to equate what that risk is and then <br />see what control can be made. If you have <br />only 1% chance of a flood it would be <br />beyond the 100 year flood plain. This is <br />acceptable to nearly everyone, with all <br />our laws, our insurance, does not consider <br />this a high risk yet there are 1,000 year <br />and 10,000 year floods. We try to apply <br />that same principle here. What areas have <br />less than a 1% risk or equivalent to those <br />areas which will be beyond a hundred year <br />flood plain. First, we have divided this <br />into four categories. The first category is <br />that area that is not undermined. So there <br />is no subsidence. Then based on the age and <br />coring and our experience, we have said <br />that this area which is cross patched in <br />blue is equivalent to being above the <br />100 year flood plain, or have less than 1% <br />chance of there being any failure from <br />subsidence within that area, within 100 years. <br />As far as we would be concerned professionally, <br />that area there would be no restriction on <br />any type of development. You can do with <br />that land exactly what you could do with this. <br />There is no restriction as far as subsidence <br />goes. Now we have a third category, which <br />we consider as a 1 to 10% chance that there <br />could be some subsidence within the area. <br />These are small areas which are cross-sec- <br />tioned and where more than 25% of the coal <br />has been removed. The mines are relatively <br />young, on the order of less than 30 years <br />since they have been closed; and really, I <br />think that is a category which might be <br />considered as ignorance, I don't know. <br />I know that they have been undermined. I <br />have not got a drill hole into these areas <br />or in the areas which are similar to them, <br />so I feel that there is a 1 to 10% chance that <br />there could be some failure in those areas. <br />The fourth category is where there would be <br />a fairly high degree. l.Je feel that there <br />is at least a 10% or better chance that <br /> <br />-11- <br />