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8.4 Surface Water Management Runoff from disturbed areas will be managed to protect against pollution of either surface or groundwater through the implementation of a site specific Storm Water Management Plan (S WMP) for the Morton Lakes Sand and Gravel Pit. 8.5 Consumptive Water Use The projected annual consumptive uses of water associated with the proposed Morton- Holton Lakes Sand and Gravel Pit are described in the SEO approved Substitute Supply Plan found in the Appendix to this permit amendment application. 8.6 Substitute Supply Plan Ground water depletions of water tributary to the South Platte River are currently augmented through a Substitute Water Supply Plan (SWSP) approved by the State Engineer for the Holton-Morton Lakes Pit. (See the back of this Exhibit) Post-reclamation ground water depletions, if any, will be replaced through a Colorado Water Court approved Plan of Augmentation. 8.7 Water Requirements Water use at the Morton-Holton site will include evaporation from exposed groundwater, sand and gravel processing, water retained in material removed from the site, concrete batching and dust control. The mining operation will extract sand and gravel deposits from the South Platte alluvium that is approximately 30 feet deep and this alluvial groundwater system is hydraulically connected to the South Platte River. The depth to groundwater is approximately 5 feet below the surface. Big Dry Creek cuts through the southeastern corner of the Morton parcel and a point of diversion for Lupton Bottom Ditch diverts from Big Dry Creek on the Morton Property. As Big Dry Creek continues downstream off of the Morton property it intersects with the South Platte to the east of Morton Lakes. There appears to be an unnamed lateral that diverts from the Lupton Bottom Ditch along the north side of the property. The Brighton Ditch is not on this 14