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3/3/2014 <br />A►, <br />Animas Glacier Gravel Pit <br />State.co.us Eecutive Branch Mail - Animas Glacier Gravel Pit <br />Gavin - DNR, Matthew <matthew.gavin @state.co.us> <br />To: Tim Cazier - DNR <tim.cazier @state.co.us> <br />Mon, Mar 3, 2014 at 9:17 AM <br />Cc: Jeremy Franz - DNR <jeremy.franz @state.co.us >, Bill McCormick - DNR <Bill.McCormick @state.co.us >, Kate <br />Pickford - DNR <kate.pickford @state.co.us >, matt. camahan @oldcastle - materials.com, Rege Leach - DNR <br /><rege.leach@state.co.us> <br />Hello Tim - <br />On Wednesday, March 26th, I conducted a site visit to the isolation berm at the Animas Glacier Gravel Pit. Matt <br />Carnahan of Four Comers Materials, Kate Pickford from your office, and water commissioner Jeff Titus (DWR) <br />accompanied me on the site visit. Prior to the site visit, I reviewed the information that you provided to our office, <br />including the "Animas Glacier Gravel Pit Drainage Report - Amendment 1" prepared by Russell Planning and <br />Engineering. Based on observations made during the site visit and the drainage report, it is my conclusion that <br />the isolation berm does not present a dam safety hazard if the mining operations are conducted as described in <br />the report, and as such will not be regulated by this office as a jurisdictional dam. <br />The basis for the above conclusion is that the tributary area above the berm is not large enough to generate <br />sufficient run -off such that the berm would create an impoundment of any significance. The drainage report <br />indicates that no process water will be pumped, diverted or otherwise routed to the basin and that the sole source <br />of water will be run -off. During the site visit, Mr. Carnahan confirmed that this is consistent with how Four Comers <br />Materials will operate the facility. He indicated that washing operations utilizing the on -site well water will not be <br />conducted within the basin created by the isolation berm, and the sole purpose of the isolation berm is to ensure <br />that the mining operation will be a zero - discharge facility. In the event that Four Comers does not operate the <br />facility as described, the Dam Safety Branch would consider this a jurisdictional dam and regulate the structure. <br />Thank you for bringing this matter to our attention. We appreciate being notified whenever there is a potential dam <br />safety issue. If you have any ongoing dam safety concerns related to this facility, please do not hesitate to <br />contact me. <br />Best regards, <br />MatthewJ Gavin, P.E. <br />Dam Safety Engineer, Water Divisions 7 &3 <br />Colorado Division of Water Resources <br />160 Rock Point Drive, Suite E <br />Durango, CO 81301 <br />off. 970- 247 -1845 xt 7003 <br />cell 970 - 946 -6863 <br />fax 970 - 259 -0944 <br />https:// mail. google. cornVmaiI /u/0/ ?ui= 2&iIra43f32ddad &vie --pt& search= inboy& th= 14488bc3da8d5b22 &sim1= 14488bc3da8d5b22 1/1 <br />