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10/25/2019 State.co.us Executive Branch Mail-Fwd: Magpie Diversion <br /> : ' ►; O STATE F <br /> STATE Do DRMS—CoalAdmin - DNR, DNR<dnr—drms—coal—admin@state.co.us> <br /> COLO <br /> Fwd: Magpie Diversion <br /> 1 message <br /> Trujillo - DNR, Zach <zach.trujillo@state.co.us> Thu, Oct 24, 2019 at 2:43 PM <br /> To: DNR DRMS_CoalAdmin - DNR<dnr—drms—coal—admin@state.co.us> <br /> the following email is correspondence from Dr. Corley and the Division in regards to the Southfield Mine, C-1981-04. <br /> ---------- Forwarded message--------- <br /> From: Musick-DNR, Jason <jason.musick@state.co.us> <br /> Date: Thu, Oct 24, 2019 at 2:37 PM <br /> Subject: Fwd: Magpie Diversion <br /> To: Doug <ajjc@att.net> <br /> Cc: Stark, Jim <jim.stark@state.co.us>, Trujillo- DNR, Zach <zach.trujillo@state.co.us> <br /> Good afternoon Dr. Corley, <br /> With regard to the remaining portion of the Magpie Diversion within the revoked Southfield Mine permit boundary, the <br /> Division believes that the diversion, as it presently sets, is stable and is designed to meet a 100 year/24 hour <br /> precipitation event without additional repair. As you know, the Office of Surface Mining, Reclamation, and Enforcement <br /> along with the Division conducted a LiDar survey of the diversion and it was determined that the flow depth of the <br /> diversion would be approximately 13 feet before the integrity of the diversion would be jeopardized. As such, the Division <br /> believes that a failure to the diversion is unlikely. This is also partially confirmed by the 2018 precipitation event in which <br /> the Florence rain gauge received 1.43 inches of rain in one hour(although the Southfield Mine area may have <br /> received more/less precipitation)and the Magpie Diversion was inspected and no issues were noted and functioned as <br /> designed. <br /> The remaining portion of the revoked Southfield Mine is currently on a reduced inspection frequency of two Complete <br /> Inspections per year. One in the Spring and one in the Fall. If, as a part of those inspections, it is determined that the <br /> integrity of the diversion has been jeopardized to the point that it would require maintenance, the Division would initiate <br /> those actions. <br /> Please let Zach Trujillo or I know if you have any additional questions or comments. <br /> Jason Musick <br /> Senior Environmental Protection Specialist <br /> A lmC 0 L 0 R A D 0 <br /> -.ao Division of Reclamation, <br /> µ Mining and Safety <br /> Department of Natural Resources <br /> P 303.866.3567 x 8134 1 F 303.832.8106 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 <br /> jason.musick@state.co.us I http://mining.state.co.us <br /> ---------- Forwarded message--------- <br /> From: Trujillo -DNR,Zach <zach.trujillo@state.co.us> <br /> Date: Tue, Oct 22, 2019 at 2:04 PM <br /> Subject: Fwd: Magpie Diversion <br /> To: Jason Musick- DNR<jason.musick@state.co.us> <br /> https://mail.google.com/mail/b/AH1 rexQukKXpKEImPJcyrtmR9s6rHMQS28JWua9PC_DG4SGkFhyO/u/O?ik=deb7fOcd20&view=pt&search=all&permt... 1/2 <br />