Agenda Date: 02/06/2018
Subject:
Title
A resolution authorizing a 3rd Amendment to an Intergovernmental Agreement between the City of Littleton and the Urban Drainage and Flood Control District for Stream Stabilization Improvements on Jackass Gulch
Body
|
Presented By: |
Keith Reester, Public Works Director |
POLICY QUESTION:
Does city council approve an amendment to Intergovernmental Agreement 14-05.06 to commit additional funds to continue construction of improvements on Jackass Gulch?
BACKGROUND:
Jackass Gulch is a natural stream running along the north side of West Mineral Avenue, from the High Line Canal to the railroad corridor. West of the railroad corridor the drainage way is contained in a storm sewer pipe, which outlets in the South Platte Park and drains to the South Platte River, south of the West Mineral Avenue bridge.
In 2014, the Urban Drainage and Flood Control District (UDFCD) and City of Littleton entered into an Intergovernmental Agreement (IGA) 14-05.06 to begin the design and construction for the stabilization of a portion of Jackass Gulch, located behind the residential properties along West Jamison Way, upstream of Jackass Hill Road. This reach was determined to be most urgent, with residential properties at risk of collapse from migrating eroding channel banks.
In 2017, construction began on stream enhancement of the South Platte River in South Platte Park, downstream of West Mineral Avenue. The work created a natural appearance low flow channel, gravel bars, riffles, pools, glides, bank stabilization and planting areas. There is concern these river improvements may be jeopardized by relatively high volumes of sediment entering the river from erosion along Jackass Gulch.
Prior council action in 2017 amended the IGA with UDFCD to expedite the project in 2017 and 2018, and thereby make the improvements along Jackass Gulch to protect the adjacent properties as well as the downstream improvements along the South Platte Park. This proposed third amendment to the IGA with UDFCD is for the last phase of construction to stabilize Jackass Gulch [Amendment #14-05.06C]. The multiple amendments are necessary due to funding cycles driven by budget years. This is anticipated to be the final amendment for the project.
UDFCD will manage the project with Littleton staff assistance.
PRIOR ACTIONS OR DISCUSSIONS:
A first Amendment, #14-05.06A, was approved by council on 10/17/17. The second amendment, #14-05.06B, was approved by council on 11/7/17.
STAFF ANALYSIS:
The residents along this reach of Jackass Gulch have expressed concerns over the proximity of the erosion in Jackass Gulch to their homes, and the rate of migration towards their homes. Design of the project began in 2014 and revealed the need for stabilization that exceeded the design and construction costs allocated in 2014. Some funds were allocated in 2017, and an additional amount was reallocated in 2017. This amendment is for the 2018 allocated funds.
OPTIONS/ALTERNATIVES:
FISCAL IMPACTS:
Littleton’s contribution will come from the Storm Drainage Fund, storm drainage projects account. UDFCD and Littleton contribution amounts and percentages from each party are proposed as follows:
|
|
Percentage Share |
Contribution |
|
2014 UDFCD |
50% |
$225,000 |
|
2014 City of Littleton |
50% |
$225,000 |
|
2017 UDFCD (1st amendment) |
50% |
$100,000 |
|
2017 City of Littleton (1st amendment) |
50% |
$100,000 |
|
2017 UDFCD (2nd Amendment |
50% |
$100,000 |
|
2017 City of Littleton (2nd Amendment) |
50% |
$100,000 |
|
2018 UDFCD (3rd Amendment) |
50% |
$225,000 |
|
2018 City of Littleton (3rd Amendment) |
50% |
$225,000 |
|
TOTAL |
100.00% |
$1,300,000 |
STAFF RECOMMENDATION:
Staff recommends the city council approve the amendment to the IGA with the UDFCD for stream stabilization improvements on Jackass Gulch.
PROPOSED MOTION:
Proposed Motion
I move to approve the resolution authorizing an Amendment to the Intergovernmental Agreement with Urban Drainage and Flood Control District for stream stabilization improvements on Jackass Gulch.