4 - Call Up: Elmer's Two Mile Creek Floodplain Permit (LUR2008-00068) MEMORANDUM
TO: Planning Board
FROM: Katie Knapp, Civil Engineer, Floodplain and Wetlands Permitting
DATE: August 22, 2008
SUBJECT: Call Up Item: Elmer's Two Mile Creek,
Floodplain Development Permit (LUR2008-00068)
This decision may be called up before Planning Board on or before
September 5, 2008
A Floodplain Development Permit was approved by Planning and Development staff on
August 22, 2008. The project includes channel improvements from upstream of
Glenwood Drive to Goose Creek and a Conditional Letter of Map Revision (CLOMR)
submittal to FEMA for hydraulic modeling and floodplain map revisions for the entire
Elmer's Two Mile Creek floodplain.
The proposed channel improvements include the Department of Utilities "Elmer's Two
Mile Trail Connection and Drainageway" CIP construction which starts at the confluence
of Elmer's "Two Mile Creek and Goose Creek and extends to Glenwood Drive. This
project includes constructing box culverts, structural walled channel, grass-lined wetland
bottom channel and a bridge under Valmont Road. The project construction drawings are
attached.
The floodplain development permit also includes the "Elmer's Two IY1ile Creek Upstream
of Glenwood Drive" channel improvements proposed by the Urban Drainage and Flood
Control District (UDFCD). This project begins approximately 195 feet upstream from
Glenwood Drive, extends 200 feet upstream and includes removal of a concrete lined
trickle channel, removal of a box culvert and construction of a grass-lined wetlands
bottom chanxrel with sections of stepped boulder retaining walls. The project
construction drawings are attached.
A hydraulic analysis was performed for the entire Elmer's Two Mile Canyon Creek to
update the floodplain maps due to new hydrology, updated topographic information and
the proposed channel improvement projects. The revised floodplain maps are attached.
This floodplain development permit was approved by Planning and Development
Services staff on August 22, 2008, and the decision may be called up before Planning
Board on or before September 5, 2008. There is one Planning Board meeting within the
14-day call-up period on September 4, 2008. Questions regarding this Floodplain
Variance should be directed to Katie Knapp in Planning and Development Services at
303-441-3273 or knappk@bouldercolorado.gov.
CITY OF BOULDER
r~~
Planning and Development Services
1739 Broadway, Third Floor P.O. Box 791, Boulder, CO 80306-0791
phone 303-441-1880 fax 303-441-3241 web boulderplandevelop.net
Land Use Review Floodplain Development Permit
Date Issued: August 22, 2008 Expiration Date: August 23, 2011
(Pursuant to Subsection 9-3-6-(e}, B.R.C. 1981)
Permit Number: LUR2008-00068
Contact Information
CITY OF BOULDER, PW UTILITIES
PO BOX 791
BOULDER, CO $0306
303-441-4232 Eric Lessard
Project Information
Location: ELMER TWO MILE FLOODWORK
Legal Description:
Description of Work: Floodplain development permit for Elmer's Two Mile Creek.
Type of Floodplain Permit:
Floodplain Review W/Analysis
Creek Name: Two Mile
Flood Protection Elevation: Not applicable
Conditions of Approval
The proposed project/activity is approved on the basis that it satisfies applicable requirements of Chapter 9-3-2,
"Floodplain Regulations," Boulder Revised Code 1981. Other floodplain requirements as set forth in Chapter 9-3-2
which are not specifically outlined in the conditions of approval below remain applicable to this project/activity.
Improvements shall be constructed in accordance with the plans submitted as part of the floodplain development
permit application, prepared by ASCG, Inc., dated July 14, 2008.
The applicant is required to submit as-built drawings and written documentation certifying that the improvements
have been constructed in conformance with all applicable requirements of this permit.
A city of Boulder wetland permit is required prior to construction.
The floodplain development permit if not appealed, is final 14 days after notification of issuance.
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Computer File Information Sheet Revisions `\1y Dr BD~IpF~ AS CONSTRUCTED ELMER'S 2 MILS TRAiL CONNECT1dN Project No./Code
Creation Dote; August 08 Initials: Q A S C G
Lost Modi(icotion Dole: Initials: ~ f N C 0 A P 0 RA1' 8 D ' ' No Revisions: CHANNEL PLAN AND PROFILE STE M 110-050
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Computer File Informotion Sheet Revisions o°y °F B0~<o~~ AS CONSTRUCTED ELMER'S 2 MILE TRAIL CONNECTION Project No./Code
Creotion Dole: August OB Init;Dls: Q A S C G
Lost Modification Dote: Initials: Q I N C O R P O A A T 9 D ' No Revisions: CHANNEL PLAN AND PROFILE STE M 110-050
Full Path: Q ~ ~e~ ~ z Issued b
Revised: Y 15016
Drowing File Name: Q 1461I.k..a~ee, mk~e. ~iw~ze 's' ' Revised:
eeeu~. sm ree eeeo n.: vmesnne' D P Void: Sheet Number
Acad Ver, Scale: Unils: Q Sheet Sub6el: Channel Subsel Sheets: CH 2 Of' 11
i.