City Council Minutes 1976 06 01 - Laserfiche WebLink

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COLO. TECH. CENTER CONT'D with that, we have concluded that there are no economic resources as defined under HB 1041, HB 1545 or HB 1529, which would in any way influence the zoning or the develop- ment of this area. The problems and engi- neering geology resources we see no prob- lem with at this time. I might ask, do you have any questions about this map before I take it down. COUNCILMAN DEL PIZZO Dr. Robinson, are those little squares the underminings on the property? DR. ROBINSON On this map, these are the major workings. We just generalized them on this particular map in order to be able to describe the coal resources. I think on the other map we have concluded a very detailed line map that show specific colors. (A new map was put up for review.) This is what we define as our subsidence potential map. As most of you know, we have for the last ten years been studying the problems of subsidence in the Louisville area. I think now we have probably drilled more holes into the abandoned mines in the Louisville- Lafayette area than any other firm, and have gained a certain amount of experience in evaluating what we find. I would like to review briefly, how we go about this so you will understand what the basis for our con- clusions are. vfuen someone approaches us, we insist to make a study as to what the potential subsidence is. We insist first that we have a good map. We have here a topographic map with the accuracy to the standards of what we call the US map standard accuracies. This is a standard which has been agreed upon by the Federal and other state governments. It is the basis for standard mapping. We requested that such a map was prepared and as you will see, it is shaded here in the background, but it is a topo- graphic map. Now this is made from aerial photography, and in this case based on ex- perience, we found that if you get a special type of photography, you can see much better detail on the ground. Now, on this par- ticular project we requested that there be low light angle infra red target. The low light angle (this is getting a little tech- nical maybe) allows you to see the very small changes in relief. Otherwise, if there is just a small rise in the land adjacent to -6-