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June 21,2018 <br /> Page 2 <br /> the river bend at the northwest corner of the lake. The riprap erosion protection should conform <br /> to the typical sections and requirements in the UDFCD Guidelines. <br /> 3. The inlet and outlet spillways should be increased in width to 100 feet as required by the <br /> UDFCD Guidelines. Concrete cut off walls for the spillway should be founded on sheet pile <br /> designed in accordance with the UDFCD Drainage Criteria Manual. Riprap erosion protection <br /> should meet the requirements of the UDFCD Guidelines and have a granular filter designed in <br /> accordance with the UDFCD Drainage Criteria Manual. <br /> I request that the improvements recommended by TZA be constructed at the Iverson Mine by Martin <br /> Marietta as part of the reclamation work to protect the long term stability of the site. <br /> Please contact me if you have any questions. <br /> Sincerely <br /> Timothy Iverson <br />