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3/14/2014 <br />STATE OF <br />• • • ` • • • <br />RE: Specific information <br />State.co.us Executitie Branch Mail - RE: Specific information <br />Carnahan, Matt (Four Corners Materials) <Matt.Carnahan@oldcastle- <br />matedals.com> <br />Tue, Mar 11, 2014 at 12:11 <br />PM <br />To: "Pickford - DNR, Kate" <kate.pickford @state.co.us >, "tim.cazier @state.co.us" <tim.cazier @state.co.us> <br />Kate & Tim, <br />It is important to note that Figure A is listed as "design - typical" of the isolation berm and Figure B as "as- <br />built". Figure B is shown as response to item # 2 in Kate's list below. The dimensions shown were <br />measured in the field. Thus the difference in slope ratios is that between the field design and actual. <br />Figure C is representative of the stormwater retention pond within the isolation berm per item # 4. The <br />isolation berm is not intended to provide impoundment of stormwater; rather it provides secondary <br />containment in the unlikely event of the retention pond filling beyond capacity. The berm further acts as <br />a sound and wind bufferforfuture operations. <br />The berm is a 500ft. extension of the 1,200ft. "Topsoil or Overburden berm" shown on the original mining <br />plan (Exhibit C page C -7). This material used to construct the berm will be used in reclamation and will not <br />remain post- mining. Further, the retention pond may be relocated or altered as necessaryto <br />accommodate future stormwater management as mining progresses. The proposed post - mining land use <br />will be commercial / light industrial development and as such, stormwater management plans will be <br />completely revamped. <br />I have attached a copy of the final site plan showing the locations of the sections for further clarification. <br />Also attached is a recently taken oblique aerial photo of the site looking west. <br />Please let me know what further information you need. <br />Thanks, Matt <br />Matt R. Carnahan <br />httpslImaii.google.co rdmaiuu V?ui= 2&ik=a43f32ddad&Hevv=pt& search= inbo> Ath= 144b2594a8f32eoc &sim1= 144b2594a8f32eoc 1/6 <br />