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;""t\. ..:."~-"'- Drainage Master Plan and Drainage Reviews East Cherry Creek Valley Water and Sanitation District Arapahoe County, Colorado MWE provided drainage master planning services for 13,2 square miles encompassing four drainage basins. Specifically. the work involved the preparation of three drainage master plans, a floodplain study, stream stabilization reports. and a rate study, This included hydrologic modeling. alternative analysis. cost estimating. floodplain delineation. a drainageway stabilization assessment. and an economic evaluation. Ongoing plan implementation included reviewing developers' drainage studies. evaluating proposed master plan revisions. designing and constructing new facilities. monitoring development and assessing the need for facilities. updating maintenance needs. and assisting the District in preparing storm drainage agreements, Various Projects South Suburban Park and Recreation District Arapahoe County, Colorado As part of our ongoing services contract with the South Suburban Park and Recreation District. MWE has completed numerous plans for improvements at locations in the City of Littleton and Arapahoe County, Colorado. At the University Boulevard bridge over Big Dry Creek. a much- needed trail ramp will be added to provide access from the street sidewalk to the streamside trail below. The deteriorating concrete trail beneath the bridge will be replaced and eroded stream banks will be repaired. Further upstream at Dry Creek Road, a new low water crossing will be constructed over Big Dry Creek, replacing a nuisance crossing on the heavily used greenway trail. At Littleton's Sterne Park. an existing pond has nearly filled with sediment from Littles Creek. The pond will be drained and accumulated sediment will be removed. Construction this winter will include draining the pond, removing accumulated sediment. and then restoring the pond as an amenity for park visitors and the surrounding neighborhood. Additional projects are planned along the Big Dry Creek Greenway. Construction documents will be completed for the final extension of the Big Dry Creek Trail from South Windermere Street west to the South Platte River Greenway Trail. This project involves design of approximately 3.~)00 feet of concrete trail through difficult terrain; the trail extension will pass beneath two railroad bridges and Santa Fe Drive, Additionally. a bridge spanning 200 feet across the South Platte River will connect the Big Dry Creek trail extension to the Mary Carter Greenway Trail. Also, MWE prepared a Phase III Drainage Report for additions to the South Suburban Ice Arena. which was submitted in April 1999, The South Suburban Ice Arena building is 56.967 square feet and includes two ice rinks. three offices. locker rooms and a lobby area with a concession. South Suburban proposes to add a 6.934-square- foot addition on the west side, The report first evaluated the drainage basins and sub-basins for available capacity, Also. the Arapahoe County Storm Drainage Design and Technical Criteria Manual was used to determine the required detention volumes and release rates for the 1 O-year and 1 OO-year storm. MWE pre- pared drawings to illustrate the site drainage plan for proposed conditions with the additions to the ice arena buildin~l. To provide detention for the parl<ing lot. an existing inlet is proposed to be modified by the addition of an orifice plate on the outlet pipe to control 10-year releases. and a curb/wall along the perimeter of the parking lot to allow ponding depth and controlled release of the 100-year storm via a weir opening at the inlet location. The west addition to the ice arena will be served by the existing 18-inch RCP that drains to the canal. A new Type C inlet will be installed to serve the landscape area west of the building. Project Approach Staff Responsibilities MWE will organize its staff to fill these roles in performing this work: Project Manager (PM). Project Engineer (PE). and Senior Resource Engineer (SR), The PM will serve as the primary point of contact with CWCB during the life of this project and will be responsible for the following tasks: ~;