FLOOD02900

• County: Adams
• Community: Commerce City
• Basin: South Platte
• Title: Lower First Creek and Direct Flow Area 0055 Major Drainageway Planning
• Date: 5/1/2002
• Prepared For: UDFDC
• Prepared By: Turner Collie & Braden Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

AGENDA

TumerCeIliec9Braden Inc.

MEETING MINUTES

First Creek OSP and FHAD
(Progress Meeting)
Time; 2:00
Date: February 16, 2000
Location: Urban Drainage & Flood Control District

Subject:
Job No.:

Lower First Creek and Direct Flow Area 0055 Outfall Study
35.050c6.040

Place: Urban Drainage and Flood Control District Offices
Date & Time: 2/17/002:00 PM

(I) Wetland Inventory (ERa)
(2) Existing Structures Inventory
(3) Alternatives
(4) Alternative Costs
(5) Cost Allocation
(6) Interim Improvements
(7) Other Issues
(8) Next Meeting/Adjournment

Attendees:

David Mallory (UDFCD)
Edward Stafford (Commerce City)
David Center (TCB)
Jim Pearce (RMA)
Tom Acrc (Commerce City Parks)
Den ise Larson (ERO)

Bill DeGroot (UOFCD)
Rick Moser (TCB)
Tim Kilgannon (RMA)
Rich Ommert (TCB)
Cbris Gervaus (Commerce City)
Stephen Smith (R VO-RLvlA.USFWS)

Pre parer:

David Center

Date: 2/18/00

The purpose of the mceting was to report on progress on the Outfall Planning and Flood Hazard Area
Delineation Study for the lower First Creek Watershed.

Wetland Inventory
Denise described the findings of the wetland inventory. Twenty-eight sites were identified as possible
wetlands. The inventory was done through aerial photographs, current mapping, previous reports and site
inspections. Within the project area, Fulton Ditch, O'Brian Canal and the Burlington Ditch probably are
not regulated by the CaE. However, this may change in the futurc and the status of the ditches should be
determined before any activities occur.

Alternatives
Rich described the different alternatives and costs associated with each. Ten alternatives were presented.
These altemativcs consisted of detention in the reach from 96,), Ave. to the O'Brian Canal, prior to
crossing 1-76 and at the confluence ofDFA 0055. The detention alternative reduced the future land use 2-
to 10-year peak flows to levels below that shown in the hydrology study for existing land use.
Additionally reductions in the I OO-year runoff event were realized. Channels consist of a trapezoidal low-
flow channel with a bcnch to convey 100-year events.

Costs
The unit cost for the right.of-way us cd in the alternative analysis was set at $2/sf. It was agreed that this
was probably too high and the ROW unit price will be lowered to $l/sf. Updated ROW cost estimates
will be provided at the next progress meeting.

Cost Allocation
Rich presented a preliminary drawing that showcd, cost allocations for the various parts of the drainage
improvements. The cost allocation method and drawing will be refined as the study progresses.