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1 <br /> . . . . . . . . . MID-CONTINENT RESOURCES, INC. <br /> 818 Colorado Ave. <br /> P.O. Box 1298 <br /> Glenwood Springs, CO 81601 <br /> October 17 , 1991 <br /> Dan Mathews <br /> Mined Land Reclamation Division <br /> 1313 Sherman <br /> Room 215 <br /> Denver, CO 80209 <br /> RE: Technical Revision 18. Secondary spillways. <br /> Dear Mr. Mathews: <br /> This letter will confirm my verbal discussion with Larry Routten <br /> concerning the design specifications proposed by the Division as to <br /> rip-rap sizing for the spillways, and re. the appropriate spillway <br /> design for the load-out pond. <br /> The Division suggested that the load-out pond be removed from <br /> consideration in this revision and dealt with separately, so as to <br /> resolve questions relating to the spillway design for this <br /> particular pond without delay of work on other ponds within the <br /> revision. we agree that this is a good idea, and request deletion <br /> of the load-out pond from this technical revision request. <br /> The Division had previously asked that Mid-Continent specify a plan <br /> for rip rap placement and sizing. Mid-Continent proposed that: <br /> It Rip rap material shall be of free-draining, durable rock, <br /> varying in size, with the average, D5O = 8 inches. Mid- <br /> Continent proposes to place a layer of smaller, gravel to <br /> cobble size rock beneath the larger rock material . " <br /> TR-18 <br /> 51 10/91 <br />