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HomeMy WebLinkAbout5C - Elmer's Twomile Greenways Project Community and Environmental Assessment Process (CEAP) AmendmCITY OF BOULDER INFORMATION ITEM FOR: OPEN SPACE BOARD OF TRUSTEES - TRANSPORTATION ADVISORY BOARD - ENVIRONMENTAL ADVISORY BOARD - PLANNING BOARD - WATER RESOURCES ADVISORY BOARD - PARKS AND RECREATION ADVISORY BOARD - GREENWAYS ADVISORY COMMITTEE AGENDA ITEM MEETING DATE: February 21, 2007 SUBJECT: Elmer's Twomile Greenways Project CEAP Amendment REQUESTING DEPARTMENT: Anne Noble - Greenways Coordinator PURPOSE: To amend the Elmer's Twomile CEAP to include a box culvert to carry the 100 year storm event rather than an open channel in the northern reach of the Elmer's Twomile drainage between Valmont Road and Glenwood Drive. GREENWAYS ADVISORY COMMITTEE ACTION REQUESTED: Staff requests a motion from the Greenways Advisory Committee approving the Elmer's Twomile Greenways Project CEAP Amendment. FISCAL IMPACT: This project was anticipated to be completed in two phases. Federal Transportation Improvement Program (TIP) funding has been approved for both phases of this project. Sufficient matching funds have been included in the Flood Utilities and Greenways Capital Improvement Program in 2006-2009. The proposed design changes are not anticipated to significantly increase the cost of the project. EXECUTIVE SUMMARY: This item gives the Greenways Advisory Committee (GAC) the opportunity to review and approve an amendment to the Community and Environmental Assessment Process (CEAP) document for the Elmer's Twomile Greenway Project from Goose Creek to Glenwood Drive. Council approved the CEAP for this project on Oct. 20, 2004. An amendment to the CEAP is being proposed to accommodate changes in the flood mitigation design based on input from adjacent properry owners. This amendment would substitute an underground box culvert between Glenwood Drive and Valmont Road instead of an open channel as originally proposed, in order to minimize impacts on adjacent proper[y owners. Page 1 Council Filter Imuact: Economic: The proposed design changes to this project do not significantly impact the cost of this project. Environmental: The proposed design changes will reduce impacts to existing trees and vegetation. Social: The proposed design changes reduce the encroachment on the Willow Brook properties and eliminate any impacts to parking spaces in Tebo Plaza. The Elmer's Twomile Creek Greenway Project involves the construction of a multi-use path and flood mitigation improvements along Elmer's Twomile Creek from Goose Creek to Glenwood Drive, including a proposed underpass at Valmont Road. YUBLIC PROCESS AND COMMENT: The CEAP for this project was approved by City Counci] in October 2004. GAC reviewed the CEAP in a public hearing on May 19, 2004, and unanimously (6-0) recommended its approval. Prior to the public hearing, the six advisory boards that are represented on the GAC received a copy of the CEAP as an informarion item, so as to enable all of these board members the opportunity to provide comments to their GAC representarive. The CEAP evaluated three altemarives for the southern portion of the project and two altematives for the northem section. The chosen alternarives included a combined pedestdan and flood drainage underpass at Valmont Road, with a wider channel width north of Valmont Road. Prior to the GAC meeting, a public open house was held on March 8, 2004 to solicit comments on this project. Centennial Engineering was hired in January 2005 to develop a preliminary and final design and obtain environmental and historical cleazances required for federally funded projects. A pre- application was submitted to the Planning Department in June 2005 in order to insure that all of the development requirements would be met. Preliminary plans were completed in May 2005, and were revised in August 2005, a$er meering with adjacent property owners. The plans were changed to include an underground box culvert beriveen the Willow Brook Condominiums and Tebo Plaza (Attachment A) rather than an open channel. This modification was made to limit impacts on trees and reduce encroachment on the Willow Brook properties and parking spaces at Tebo Plaza, due to limited space for a conveyance channel. ANALYSIS: Several channel width options were evaluated prior to eliminating the open channel concept for the underground box culvert. A wider, open channel (36 feet wide) would have required the removal of 50 parking spaces in Tebo Plaza and all of the mature trees east of Willow Brook Condominiums. The channel would have retaining walls five to eight feet high on both sides, with the distance between the retaining wall on the west side of the channel and the Willow Brook Condominiums as close as 10 feet. By reducing the channel width to 30 feet and moving the channel closer to the Willow Brook Condominiums, the number of parking spaces impacted would be reduced significantly, but the height of the retaining walls would increase and the distance beriveen the retaining wall on the west side of the channe] and the condominiums would Page 2 be as close as four feet. Attachment C is cross sectional drawings that illustrate the wider and narrower channel alternatives in the original CEAP, as well the proposed design amendment. The Urban Drainage and Flood Control District has evaluated the revised plans and is in concurrence with the installation of a box culvert for this application. The proposed changes were presented at a public open house on November 2005 to solicit comments. The attached plans (Attachment A) along with an explanation of the modifications (Attachment B) were presented. Members of the public that attended these meetings understood the site constraints and were concerned about the impact on existing trees and were therefore supportive of the proposed design change. STAFF RECOMMENDATION: Greenways staff recommends that the GAC make a motion in support of this amendment to the Elmer's Twomile CEAP. ATTACHMENTS: A Elmer's Twomile Project CEAP amendment plans (3 pages) B Explanation of Modifications from the CEAP Concept Plan C Cross Section Drawings (3 pages) Page 3 . , /„~ ~ yy -; w~ - - - !~t• e .: / y', . r ?I ~t ~ . ,F~ ~ .r ~~ ~ ~~.~ ~~ ',~'~.s~"'-.' ~~F F I.:~ ~ ~~i. . i -~ , , , ~r . , . ~ . _ .. . - . ..i,r.. 'X'Y,~j +. 4 ._._'___~.____.__. . _ "" . ~ A.~ ~ . ~' ., .: .A . . .-___. , - W: ... _.. ~ . . ..Y~' S ~ n ~ •. ~~1", ' ~ . ~ - . . ..... ~ n . i ~ ?S+~ ~~~.z k ~ . --~ .. . I S` ~:z.. t ~, ~. ' . . 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Anachment B Elmer's Twomile Preliminary Plans; Modifications from the CEAP Concept Plans Goose Creek to Valmont Road Comments/Concerns Change to Address Concerns 1 Provide access to Shady Hollow Access to be shown in future lans 2 Changed wood deck pedesh-ian bridge over Boulder & Whiterock Ditch to concrete brid e 3 Extended retaining wall 100 feet south 4 Provide place for trash and recycle Extended box culvert 35 feet north 5 Preserve trees along the Boulder & Whiterock Ditch Provided at grade connection to south of Valmont Road adjacent to underpass rather than ad'acent to ditch 6 Preserve all parking spaces at Office Building "Outlot Reduced underpass width A" from 30 R to 22 8, realigned the Underpass, reconfigured arkin lot 7 Provide low flow to Boulder & Whiterock Ditch 18" pipeline added along east I side of channe] to divert low flows to the Boulder & Whiterock Ditch Valmont Road to Willow Brook Comments/Concerns Change to Address Concerns 8 Provide connection to neighboring residents and Access will be negoriated with businesses adjacent property owners as lans move forward 9 Why was path shifted east at nor[h end of Rayback ShiB path east to accommodate grades resulting from eliminating retaining wall channel 10 Preserve trees Changed from open channel with retaining walls to underground box culvert with win walls Willow Brook to Glenwood Drive Comments/Concerns Chan e to Address Concerns ll Preserve parking at Tebo Plaza Path shifted west, changed from open channel to under ound box culvert. 12 Preserve trees adjacent to Willow Brook Changed from Open Channel Preserve backyards at Willow Brook to Underground Box Culvert, which is shown to pass under Tebo's azkin lot. Preserve trees adjacent to Willow Brook Shifted path west and deleted Preserve backyards at Willow Brook retaining walls. 13 Consider footbridge across the channel from east end Connecrions will be negotiated of Easrivood Court to Tebo Plaza with adjacent properry owners as lans move forward. 14 Provide connecrion to neighboring residents and Connections will be negoriated businesses with adjacent property owners ~ as lans move forward 15 Preserve trees adjacent to Willow Brook Concrete inlet structure and Preserve backyards at Willow Brook trash rack added at upstream end of 12'x 6' box culver[ at Glenwood Drive. Path shifted east at north end. SECTION B - SOUTHERN REACH Mc(,aughlin~Water~~ 125D6 Mes~ e»y.~a e. ., sou. aao IaYawoeE. Cc1a.~/o 6022E ~Phon~ 301_158.555C ELMER'S TWO M1L.~ CREEK Gf2EENWAY PROJECT PHASE II, ALTERNA7IVE 1 NARROWER GHANNEL ~~~ C£P~1° ~Ict~ Looxir~a Fr~am sou'rn ro Nors7H i I 1 SECTIpN A- NORTHERN KEACH ~4 ~{,~.A t ~' ~`' ~ ,o-o rnru E<sf \ , . ~wuor inooa ~~~ ~(lOC~rlo ~" I~Wi~p~ SCKI1 SECTION B - SOUTHERN REACH Mc~ughia~Wab~~.~ ~zeca ~..i ev.ua 4anu.. evw ma Ut...W. [nl.+.Ae eanse VTsn~ SO].Y6,E640 ELMER'S TWO M1LE CREEK GREENWAY PROJECT PHASE Il, ALTERNATIVE 2 WIDER CHANNEL AtLOf~f[0~`" ~" 11411~e fL~LA ~ro~- C~P R~rl LOOKINO FROM SOUTH TO NORTFI SECTION A- NORTHERN REACH Ne~r I~ i/~ e a s w i tim ~ ar..~- %//~ 1~ '~ ~/J ~/' "'1 ~ I ~~ ~ L (~ C 14+20 ~ ~ ~ E I r "° a6 , s~o~ ,.-_ _ ~ mwuea m.. ~ . _ --~axs ~- 1- ~- _- ~- _~ ~- ~ . 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