HomeMy WebLinkAbout20140335.tiff RESOLUTION
RE: APPROVE WORK ORDER FORM (FLOOD REPAIRS - WEL-BR13/44B) PURSUANT
TO AGREEMENT FOR DESIGN SERVICES AND AUTHORIZE CHAIR TO SIGN -
AYRES ASSOCIATES, INC.
WHEREAS, the Board of County Commissioners of Weld County, Colorado, pursuant to
Colorado statute and the Weld County Home Rule Charter, is vested with the authority of
administering the affairs of Weld County, Colorado, and
WHEREAS, the Board has been presented with a Work Order Form (Flood Repairs -
WEL-BR13/44B) Pursuant to Agreement for Design Services between the County of Weld, State
of Colorado, by and through the Board of County Commissioners of Weld County, on behalf of the
Department of Public Works, and Ayres Associates, Inc., commencing January 13, 2014, with
further terms and conditions being as stated in said work order form, and
WHEREAS, after review, the Board deems it advisable to approve said work order form, a
copy of which is attached hereto and incorporated herein by reference.
NOW, THEREFORE, BE IT RESOLVED by the Board of County Commissioners of Weld
County, Colorado, that the Work Order Form (Flood Repairs - WEL-BR13/44B) Pursuant to
Agreement for Design Services between the County of Weld, State of Colorado, by and through
the Board of County Commissioners of Weld County, on behalf of the Department of Public
Works, and Ayres Associates, Inc., be, and hereby is, approved.
BE IT FURTHER RESOLVED by the Board that the Chair be, and hereby is, authorized to
sign said work order form.
The above and foregoing Resolution was, on motion duly made and seconded, adopted
by the following vote on the 3rd day of February, A.D., 2014, nunc pro tunc January 13, 2014.
BOARD OF COUNTY COMMISSIONERS
WELD COUNTY, COLORADO
ATTEST: t( t_,p ��// , Ida IL/`•��� ��� n om'
"" `�� ,�� ��1 •la. Rademac er, Chair
Weld County Clerk to the Boa ! o.,1861 ,
Slit,',""'
1A" a.■
,�ara Kirkmey Pro-Tem/tatBY.
ty Clerk to the Board
Sean P. Conway
AP ED RM: T ---
Mike Fre? n
oa ty Attorney (//-
William F. Garcia
Date of signature 4 'S•
ee /&, 6CM 2014-0335
02- 7_/41 EG0070
BC0045
WORK ORDER FORM(FLOOD REPAIRS)
PURSUANT TO AN AGREEMENT BETWEEN
WELD COUNTY
AND
AYRES ASSOCIATES INC.
DATED: January 31.2014
Work Order Number: Ayres-3
Project Title: WEL-BR 13/448 Design Services(Immediate Needs Prior to Spring Runoff)
Commencement Date: January 13.2014
Completion Date:April 30.2014
Limitations on compensation: Not to exceed$24,400.00
Professional agrees to perform the services The attached forms are hereby accepted and
identified above and on the attached forms in incorporated herein: Exhibit A — Scope of
accordance with the terms and conditions Work, Exhibit B — Cost/Fee Breakdown,
contained herein and in the Professional Exhibit C—Proposed Schedule.
Services Agreement between the parties, dated
January 13, 2014. In the event of a conflict /
between or ambiguity in the terms of the Weld Co tytublie W rkg Dep ent-
Professional Services Agreement and this work --'
order (including the attached forms) the By:
Professional Services Agreement shall control. Projec anager
Date: tit" ( ^ /
By:
Ayres Associates Inc. Director of Pub is Works Date: FEB 0
By: �.
Title. /HA 04w,6i> 4 / eLe.1"
Date: O/A/ By:e (a
Doug as R emacher, OCC Chair
,4s Lb
ATTEST:
O 1/42
Weld County Clerk to the Board
By: antit ,� I � ( � 14eC
Deputy Clerk to the Board
2014-0335
C C9 00-®
AYRES
Ayres Associates Inc ASSOCIATES
EXHIBIT A - SCOPE OF WORK
Weld County 2013 Flood Recovery
WEL013.0-044.0B County Road 13 over Little Thompson River
Structure Description:
This single-span bridge has a clear span length of 58.3 feet. Thirteen steel girders span
between vertical steel pile abutments. We do not know the type of abutment foundation (spread
footing versus piles). The abutments feature steel wing walls that are angled 45 degrees to the
road at all four corners. The 2010 bridge inspection report gave a Sufficiency Rating of 62.6 and
an Item 113 (scour critical) code of 8, which means the structure was expected to be stable
under anticipated scour conditions.
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Flood Damages and Ongoing Issues:
Damages encountered during the September 2013 floods include bridge and roadway
overtopping with roadside embankment and shoulder damages both north and south of the
bridge. At the bridge there was erosion and loss of the embankment fill behind the right (south)
abutment sheetpile wall and wingwalls and partial loss of the embankment fill on the upstream
side behind the left (north) abutment sheetpile wall and wingwall. Remnants of the old wooden
bridge abutments remain in the embankment fill and were exposed during the flood.
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AWES
Ayres Associates Inc ASSOCIATES
Ayres staff visited the crossing site with Richard White of Weld County on January 17, 2014.
Both approaches have been repaired and the bridge is open to traffic. The main channel has
widened considerably from the pre-flood condition. Topographic and geomorphic evidence
suggests that the Little Thompson River is incised within its floodplain. This may be an ongoing
long term degradation problem related to changes in the watershed hydrology associated with
rapid urbanization in the upper portions of the watershed. Analysis of aerial photography
revealed that the river immediately upstream was realigned when the bridge was built in 1966.
This realignment likely shortened the channel which would produce a steepening of the channel
profile.
Prior to the flood, the sheetpile abutment walls were deteriorating significantly, especially along
the base of the walls, which had been covered with sediment. However, removal of the
overlying sediment during flood flows exposed the holes at the base of the abutment walls and
subjected the fill behind the walls to potential scour and erosion.
Work Recommended Prior to Spring Runoff (Phase 1):
• Place additional rock riprap at the upstream corner of the north abutment c.
• Place rock riprap under the bridge along the toe of the north abutment.
• Survey the right of way limits, the bridge surface and along the north embankment side
slopes and under the bridge along the north abutment.
• Assuming no temporary easement or ROW acquisition for this construction'
Work Anticipated for Phase 2:
• Re-grade/stabilize the east roadway embankment north and south of the bridge (600ft)
and protect shoulder/embankment slope with TRM/rock.
• Remove and replace the fill behind both abutments.
Potential Phase 3 work for Betterments and/or Resiliency:
• Replace the bridge with a structure designed to current standards
Detailed Scope of Work for Phase 1:
1. Kickoff Meeting. Ayres project manager/engineer and geomorphologist will meet with
County project manager at County Public Works office.
2. Site Assessment. Ayres project manager/engineer and geomorphologist meet at the site
with County project manager to observe current field conditions. assess geomorphology
and discuss what emergency repairs were done.
3. Survey. Conduct boundary survey of the right of way limits and topographic survey of the
road pavement and embankment within the right of way within 250ft north to 350ft south
of the bridge with greater detail around the north bridge abutment.
4. Prepare brief environmental documentation for permitting work at this site.
5. Progress Meeting. Conduct one progress meeting with County project manager at
County Public Works office.
6. Design. Develop design of Phase 1 riprap at the north abutment and through the bridge
along the north abutment.
AYRES
Ayres Associates Inc ASSOCIATES
7. Plans and Deliverables. Prepare abbreviated Phase 1 drawing set along with special
provisions as needed. Estimate quantities and prepare engineer's estimate of probable
cost for Phase 1 activities.
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Exhibit C: Schedule of Weld County Flood Repairs on the Big and Little Thompson
Priority Task Completion
Site Task Task Start Date Date
Scoping Meetings January 13, 2014 January 28, 2014
Site Assessment January 16, 2014 January 31, 2014
Survey February 5, 2014 February 12, 2014
1 WEL027.5-048.OA Design & Plans February 13, 2014 February 28, 2014
Review& Revision? February 28, 2014 March 7, 2014
Bidding* March 10, 2014 March 24, 2014
Construction* March 31, 2014 April 28, 2014
Scoping Meetings January 13, 2014 January 28, 2014
Site Assessment January 16, 2014 January 31, 2014
Survey February 8, 2014 February 15, 2014
2 WEL017.0-050.0A Design &Plans February 17, 2014 March 1, 2014
Review& Revisions* March 1, 2014 March 7, 2014
Bidding* March 10, 2014 March 24, 2014
Construction* March 31, 2014 April 28, 2014
Scoping Meetings January 13, 2014 January 28, 2014
Site Assessment January 16, 2014 January 31, 2014
Survey February 11, 2014 February'18, 2014
3 WEL013.0-044.0B Design & Plans February 19, 2014 March 5, 2014
Review& Revision? March 5, 2014 March 12, 2014
Bidding* March 13, 2014 March 27, 2014
Construction* March 31, 2014 April 28, 2014
Scoping Meetings January 13, 2014 January 28, 2014
Site Assessment January 16, 2014 January 31, 2014
Survey February 11, 2014 February 18, 2014
4 WEL054.0-013.0A Design & Plans February 19, 2014 March 5, 2014
Review& Revisions* March 5, 2014 March 12, 2014
Bidding* March 13, 2014 March 27, 2014
Construction* March 31, 2014 April 28, 2014
*Schedule dependent upon other parties not Ayres Associates such as Weld County
or the eventual contractor.
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