2018-01-16_PERMIT FILE - M2017036 (2)

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Second Submittal as defined by FEMA. Surface runoff from the Site and surrounding area can be characterized as sheet flow off pasture and agricultural land. Offsite storm water runoff reaching the Site flows across as sheet flow. The Little Cache la Poudre Ditch is elevated and traverses west to east across the approximate middle of the Project area, and serves as a surface drainage divide. The Little Cache la Poudre Ditch is not anticipated to intercept surface runoff. Storm water north of the Little Cache la Poudre ditch flows to the east and northeast; storm water south of the Cache la Poudre ditch flows to the southeast. Surface runoff in the area flows generally south and southeast toward the river when not intercepted by irrigation ditches or the constructed roadside drainage system of swales and culverts. There are no named natural waterways through or adjacent to the Site. During the anticipated 10-12 years of gravel mining operations for the Project, on-site runoff and off-site runoff that historically flowed across the Site will be directed to and retained in the Pits, which will be excavated to 15 to 20 feet depths below the current ground surface. Storm water directed to the unlined Pits will be captured and utilized in the process water circuit. LRM plans to obtain the required water rights to retain this storm water. 2.2.3 Groundwater Regional Groundwater is a source of water for municipal, domestic, agricultural, and industrial uses within Larimer County;however,diverted Cache la Poudre river flows and trans-mountain diversions form the bulk of the water sources for these uses in urban areas along the Front Range. The viability of the groundwater resource is dependent on characteristics of the geologic unit from which groundwater is extracted. Well yields(flow rates expressed in gallons per minute) of groundwater wells are controlled by the permeability of the host rocks. • Metamorphic and igneous rocks have relatively small well yields [1 and 15 gallons per minute (gpm)], except in highly weathered granitic rocks that Loveland Ready-Mix Concrete 6 Telesto Solutions,Inc. 20180112 gmutidwat�stwty_2balwnnunaldocx January 2018