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<br />monitoring of any kind was required, and there have been no problems since the pits have <br />been operating <br />8) The Western Gravel North R-34 Pit is located on the lower terrace approximately %z <br />mile northeast of Phase 1 of the Haldorson Pit. This pit was excavated to a depth of <br />approximately 20 feet. No shale was encountered and the steady ground water level is <br />approximately 6 to 7 feet from the surface with little fluctuation from imgation season to <br />dry season. This is typical of a lower terrace neaz the floodplain of a sizeable river on the <br />west slope of Colorado. <br />9) Since the long term Haldorson operation contemplates mining a portion of the terrace <br />to slopes of 3H:1 V, the operation will then leave a depression in the landscape that can be <br />irrigated as before, with the exception of the sideslopes themselves. An evaluation of the <br />potential impacts of this change to the landscape is in order. <br />In short, the current regime is that during irrigation, the CJ and CJN laterals provide <br />irrigation water to the azeas west and south of the site. No imgation occurs on the Spring <br />Creek Mesa east of the site. Much of the water is consumed by the plants or released in <br />evapotranspiration. Aportion of this imgation water infiltrates into the gravels which, <br />then migrates downwazd toward the Mancos Shale and towazd the lower terrace. The <br />water moves within 7 feet of the surface of the lower terrace toward the river. <br />Annual precipitation of 10-14 inches makes the terrace very dry and areas that do not get <br />irrigation are usually fairly barren with only drought tolerant grasses and shrubs able to <br />survive. The permit area itself has historically been irrigated. The azeas west and south of <br />the permit area cannot be affected by the operation since the goundwater direction is <br />toward the pit from these azeas. No wells exist in these azeas and imgation will continue <br />as it has for decades. The water will continue to migrate as it always has, below the <br />mining operation to the northeast. The removal of imgation from each mining phase as it <br />is mined could lessen the amount of infiltration into the ground, but this amount is <br />relatively small as compared to the whole Mesa. It is also temporary since irrigation will <br />be re-installed in each phase after Honing. Denying this request based on this pretext is <br />tantamount to saying that the landowner must forever imgate all his land since the <br />infiltrated water is vital to other people downstream. <br />Another permanent effect of the plan is that the permanent depression will affect surface <br />water runoff from the site. In other words, there will be no surface water nmo$ The <br />surface of Spring Creek Mesa is so flat and the rainfall so low that ahnost all runoff either <br />evaporates, is taken up by the plants or infiltrates into the gravels- For the post-mine <br />depression, this will not change. It could only affect the water regime if huge amounts of <br />water fell as precipitation and this water was needed as surface water dowH~ream. This is <br />not the case. There is also an added benefit to the depression. For very lazge runoff <br />12 <br />