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I I I I I I I I I I I I I I I I I I I Mr. David Burke r~ovember 15, 1979 Page Four this area wil I not easily enter tunnel systems which could then contaminate ground water in the Leadville vicinity, Nevertheless, site specific evaluation by a sanitation engineer should be part of any planning effort. Ground water potential should be fairly high in this area because of the fracture porosity created in large part by the faulting in the' area. The faults may carry signi- ficant quantities of ground water and, since there is a large recharge area in the high country above the site, ground water development for domestic use has a relatively high potential. I n summary, it seems that thi s tract does have deve 1 opab 1 e areas whi ch are not highly affected by mining; these would be restricted to lower areas away from avalanches and yet high enough to be out of the way of flash flooding in the several gulleys in this tract. Although landslides do not occur within this tract the potential for sliding is still there especially in the event of an unusually wet spring or the supersaturation of soils on hillsides by man. Over- watering practices such as irrigating, lawn watering and so on should be held to a minimum and be addressed in planning. If an alternative source for domestic \/ater is pI anned through the use of catchment ponds in these two tracts, this should be approached with the supersaturation problem in mind, so that steep areas sunounding a catchment pond are not caused to slide by water leaking out of the pond, SOLID WASTE AREA - Lower Iowa Gulch - It is my understanding that the southern most tract is to be used for solid waste disposal. This area within Section 36 is out of the area of intensiye mining and in fact only scattered prospect pits are in evidence on the tract, This is in one way a disadvantage. For most sol id waste disposal it is desirable to have low ground or old gravel pits or rni ne area s wh i ch can be fi 11 ed with sol i d waste and covered up to form reI a- tively flat usable areas at the end of the land use program. In this area the only low ground which can be filled are the various gulches, especially lower Iowa Gulch which run through the southern part of this tract, This does not appear to be a suitable site for disposal, in my opinion, because of the high run off potential in Iowa Gulch, with even flash flooding a possibility, There- fore, it appears that less important gulleys in the northern half of the site should be used initially. Perhaps culverts can be used or some other route sup- plied for run off water to take rather than through the solid waste disposal area, Another possibil ity is to fi rst quarry some of the sand and gravel de- posits in the northern portion of this tract and then to use these sites as , sol id waste disposal areas, It was not clear what thickness of sand and gravel \'Iould be available here and the sand and gravel is not of top quality. It is in the foml of 9 I ac i a 1 dri ft so that the sort i ng of the sand and gravel wi 11 be poor. Nevertheless this is a way to proceed in creating low areas for solid waste disposal, Care must be taken because these sand and gravel deposits are quite permeable and ground water' leaching through the solid waste disposal will certainly enter the ground water table in this vicinity. Water percolating through sand will filter itself within a short distance and this will vary depending on the chemistry and the exact nature of the soil, but will probably purify within a half mile to a mile from the site, Domestic water should not be allowed from wells within a mile radius of this sol id waste area for this reason unless a sanitation engineer upon close :;tudy determines that a particular well may be developed at a site nenr the sol id waste area, Al so, because A - 11