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October 11, 2011 <br />DEPARTMENT OF NATURAL RESOURCES <br />DIVISION OF WATER RESOURCES <br />Tomas M. Dea, P.E. <br />TZA Water Engineers, Inc. <br />12596 W. Bayaud Ave., Suite 330 <br />Lakewood, CO 80228 <br />Re: London Mining & Smelter Pipeline Reservoir Rehabilitation ( WDID 2304497) <br />Section 13, T9SN, R78W, 6" P.M. <br />Water Division 1, District 23 <br />John W. Mckenlooper <br />Governor <br />Mike King <br />Executive Director <br />Dick Wolfe, P.E. <br />Director/State Engineer <br />David L. Nettles, P.E. <br />Division Engineer <br />Dear Tom: <br />This letter is to respond to your letter of September 22, 2011 requesting approval to make reservoir <br />releases from the above referenced reservoir to Mosquito Creek via the saturated alluvium rather than a <br />surface discharge. Allowing releases directly into the saturated alluvium will both significantly reduce the <br />amount of existing wetlands that would have to be disturbed if a surface outlet was installed and allow <br />year -round releases from this reservoir at an approximate elevation of 10,250 feet above mean sea level. <br />I have discussed this request with Water Commissioner Garver Brown and we agree that allowing <br />releases directly into the saturated alluvium of Mosquito Creek is acceptable and 1 hereby approve this <br />request. <br />I would note that you are proposing extensive modifications to this existing reservoir. This reservoir <br />currently appears to be a non jurisdictional impoundment from a dam safety perspective. My approval of a <br />release structure allowing releases directly into the saturated alluvium of Mosquito Creek does not relieve <br />you of meeting all applicable dam safety requirements. I have copied John Hunyadi of our Dam Safety <br />Branch so that he is aware of this to facilitate any necessary coordination. <br />Please contact me if you have any questions about this letter. <br />Regards, <br />AA <br />David L. Nettles, P.E. <br />Division Engineer <br />DLN:dln \Smelter Pipeline_Reservoir OK Letter 20111011.docx <br />Cc: Garver Brown, Water Commissioner <br />Claudia Engelmann, Assistant Division Engineer <br />John Hunyadi, Dam Safety Engineer <br />Water Division 1 e Greeley <br />810 91" Street, Suite 200 • Greeley, CO 80631 • Phone: 970 - 352 -8712 • Fax: 970 - 392 -1816 <br />http://water.state.co.us <br />