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Mr. Chris Rowe December 12, 2006 Page Five of Eight g. See attached letter report from Scott, Cox and Associates regarding lateral stability and mining setbacks. h. 0.5 to 1.0 feet i. see attached. j. In the unlikely event that the liner does no meet SEO criteria the failed liner section will be repaired or replaced. k. As discussed above, there is any number of successful examples of lined pits in the area. Going back to the mid 1970's, the White Rocks Pit east of Boulder was likely the first sand and gravel pit to employ the compacted liner technique. More recently, the Deepe, Lyons, Nelson and Heaton Pits have all successfully constructed, to one degree or another, compacted liners in order to either eliminate or reduce groundwater seepage. Overall, the construction aggregates industry has over 30 yeazs experience constructing compacted clay liners at sand and gravel pits. The Camenish Borrow Pit liner will be stable and will operate as it is intended to. 1. The estimated cost to install the compacted liner at the Camenish Borrow Site is $400,000.00. In order to expedite the Divisions evaluation of the Camenish reclamation plan, the Applicant is prepared to modify the end land use to include developed water storage in addition to rangeland. The Division's concern about the possibility of saline conditions exisfing in areas of the floor of the Camenish Borrow Pit is only hypothetical. It assumes that there will be seepage of ground water through the floor of the pit and in an amount sufficient to pond which may or my not be the case and that the water will be saline to the extent that "saline soil conditions" may result. Typically, in those areas of southwest Weld County where naturally occurring saline soil conditions are present they are identified by such things as the accumulation of salts at the ground surface and the presence of inland salt grass. None of those conditions have been observed on the Camenish property; therefore, we can assume that the existing soils oa-site are not necessarily saline. However, in reclaimed sand and gravel pits where saline soils occur naturally and where those soils were used to reclaim the pit isolated saline conditions have been observed but not to the detriment of the overall reclamation of the site and the intended post reclamation land use. The presence of "saline conditions° does not mean that the reclamation of the site has not been successful or that the site cannot be used as rangeland.