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f Mr. Randy Overton ~ • December 2, 1977 Page 3 and indicated that the entire St. Vrain Valley has the potential for being filled by a series of ponds and lakes, unless alternate forms of reclamation (filling quarries) are proposed. The evapora- tive losses resulting from the creation of large areas of surface water should be addressed, not just in this case, but in others as well. a~ „r,. 3. In regard to the proposed reclamation plan, no information is } „~ ~~- provided concerning the volumes of material that will be ~~ ~ ~-~- available to accomplish the plan. Also, it should be noted ~,,,py~:.~t'~' that material from this site will be used in the reclamation effort at the Corporation's silica operation located west of North Foothills Highway. According to the Martin Marietta representative, this material can be easily furnished. 4. In order to evaluate the reclamation plan, a more detailed contour aJ,.A.~ ~ map (2' intervals) would be desirable. The Staff is also concerned -~ Q~ with the visual impact of the mining, and the more detailed plan ~a4 u(~'"'~ would provide a better indication of the final appearance of the property. a< 5.~ The Boulder Citq-County Health Department has indicated some pro- ¢„~ ~,..,k, blems with air uality at the site as detailed in the attached memorandum. Efforts to resolve these problems should continue. 6. The Staff requests clarification as to the purpose and proposed activities, if any, to be located in the buffer area designated on the quarry reclamation plan. How does this area differ from other portions of the site not shown as pits or waste areas? The representative of the Corporation stated there would be no activities in the buffer area. 7. Will ally changes in the plant be required, or will major changes in the nature of the operation be proposed? The representative of the Corporation stated that there would be no expansions in the plant itself and that no major changes in the nature of the operation are comtemplated. 8. No mining of sand and gravel will be allowed without the appropriate Special Use approval from Boulder County. The representative of Martin Parietta indicated that there have been some gravel operations on the property, but that no mining of sand and gravel would begin without the appropriate Special Use approval from Boulder County, or unless a legal non-conforming use had been established with the County.