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Geoff Niggeler <br /> September 4, 2018 <br /> Page 3 <br /> roadbase material. Henderson plans to purchase and import Class 5 road base from a local <br /> supplier for the roadbase material. An impermeable barrier is not included in the design due to <br /> the expected short duration of the high-water condition impounded by the detention berm. <br /> However, a region of select embankment fill with a minimum of 15% passing the No. 200 sieve is <br /> specified. <br /> There are two gate operated culverts under/through the Seep Road that feed the channels into <br /> the Ute Park Seepwater Pump Station (UPPS). The length of the north feeder channel culvert <br /> currently restricts the width of the roadway at the crossing to prevent inundation of the culvert <br /> outlet. This culvert will be extended approximately 25 feet on the downstream end in conjunction <br /> with the raise to prevent burial of the downstream end. <br /> The south feeder channel culvert was previously extended approximately 20 feet on the <br /> downstream end to include the intake piping to the Emergency Diesel Pump System (EDPS) <br /> adjacent to the culvert and thus does not require modification as a part of the raise. The location <br /> of the EDPS concrete pad and flow meter at the downstream toe of the existing Seep Road require <br /> the installation of two levels of a Mechanically Stabilized Earth (MSE) block walls on the berm <br /> side of the pad to prevent placement of fill on the system components. The wall will be <br /> constructed without modifications to the EDPS and to allow for ease of access to components for <br /> future maintenance and repair. <br /> Henderson will also raise the gate operator electronics above the new high-water line that will be <br /> performed in conjunction with the road raise. New buried conduit for the gate communications <br /> cabling will be installed across the roadway by Henderson personnel at the same time as the <br /> Seep Road raise. <br /> The schedule is for this work to be performed by Henderson personnel and equipment in <br /> September and October 2018. The existing safety berms on the roadway are jersey barriers that <br /> will have to be removed during construction. A collection of 15 photos have been attached to this <br /> memorandum to provide an idea of the existing site conditions for construction. <br /> R\1300\1333\1333.01\1333.01.13_Berm_Road_Raise\DOCUMENTS\Design Basis\2018july23_TM_DesignBasis.doex <br />