HomeMy WebLinkAboutItem 09 - Big Bear CreekMEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
FROM: BRUNO RUMBELOW, CITY MANAGER
MEETING DATE: AUGUST 6, 2024
SUBJECT: RATIFY ENGINEERING SERVICES CONTRACT AMENDMENT #1 FOR
BIG BEAR CREEK EROSION ASSESSMENT AND APPROVE THE
CONTRACT FOR SLOPE STABILIZATION REPAIR AND
APPROPRIATION ORDINANCE
RECOMMENDATION: City Council to consider ratification of engineering contract amendment
No. 1 for Big Bear Creek Erosion Assessment with Halff Associates, Inc.,
approval of slope stabilization repair with Keller North American, Inc. and
an ordinance appropriating the funds.
FUNDING SOURCE: Upon approval of the attached ordinance, funds will be available in the
Utility Enterprise Fund in the estimated amount of $1,500,000.
BACKGROUND: Big Bear Creek has been experiencing erosion for many years. Storms
have destroyed or damaged three sanitary sewer aerial crossings along
the channel. Additional aerial crossings, bridges, trails, parks, public and
private property may be threatened by erosion and changes to the Big
Bear Creek channel.
To identity and evaluate existing erosion issues and erosive potential
along Big Bear Creek Halff Associates, Inc. (Halff) was engaged. On
November 21, 2023, council approved a contract with Halff in the amount
of $220,000. The information from their evaluation is being prioritized and
collected into a format to create a stream asset management program.
This study will identify current and likely future areas of concern along Big
Bear Creek and this information will be utilized to create an erosion
protection plan.
While the study was being performed by Halff Associates, a portion of
channel bank along Big Bear Creek has collapsed and requires
emergency repairs. The City has a sanitary sewer main that is
immediately threatened by this bank collapse which serves over 100
homes and behind the sanitary sewer is a single family residential home.
City Staff contacted three contractors that could perform this sort of work.
Stoic Contracting could not perform this work as needed, KEC Contracting
did not respond in the timeframe required and Keller North America, Inc.
(Keller) was able to meet us immediately to begin design and look at
options for the project. The City has used Keller before with excellent
results.
Due to the emergency nature of this failure and needed repair timeline,
Keller has submitted a proposal for time and materials for Phase 1 that
includes temporary shoring to stabilize the slope with shotcrete and soil
nails in the amount of $236,372.50 (rounded to $250,000). Phase 2 of the
slope repair is for a permanent wall along the creek (likely gabion baskets)
with drill shaft foundations and associated earthwork in the estimated
about of $1,225,000. Keller will develop engineered plans and shop
drawings for this project. Design, final costs and contract negotiations are
still being completed for the Phase 2 permanent repairs.
Staff executed Contract Amendment #1 with Halff Associates in the
amount of $25,000 to provide a third party review of plans and cost
estimates provided by Keller during these emergency repairs. These
services will provide quality assurance of the bank stabilization
improvements in line with the erosion study that Halff is performing for the
whole creek. Thus far, Halff concurs that the cost estimates and design
parameters from Keller are within reason.
Staff recommends approval.
ORDINANCE NO. 2024-063
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF
GRAPEVINE, TEXAS, AUTHORIZING THE APPROPRIATION
OF $1,500,000 IN THE UTILITY ENTERPRISE FUND;
DECLARING AN EMERGENCY AND PROVIDING AN
EFFECTIVE DATE
WHEREAS, the City Council of the City of Grapevine desires to improve Big Bear
Creek; and
WHEREAS, funding is available in the Utility Enterprise Fund; and
WHEREAS, all constitutional and statutory prerequisites for the approval of this
ordinance have been met, including but not limited to the Open Meetings Act and Chapter
211 of the Local Government Code; and
WHEREAS, the City Council deems the adoption of this ordinance to be in the best
interests of the health, safety, and welfare of the public.
NOW THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF
GRAPEVINE, TEXAS:
Section 1. That all matters stated hereinabove are found to be true and correct
and are incorporated herein by reference as if copied in their entirety.
Section 2. That the City Council hereby authorizes $1,500,000 to be appropriated
from the Utility Enterprise Fund for the improvements to Big Bear Creek.
Section 3. That a copy of the revised FY 2023-2024 Annual Budget document
shall be kept on file in the office of the City Secretary.
Section 4. That the terms and provisions of this ordinance shall be deemed to be
severable, and that if the validity of any section, subsection, word, sentence or phrase shall
be held to be invalid, it shall not affect the remaining part of this ordinance.
Section 5. That the fact that the present ordinances and regulations of the City of
Grapevine, Texas, are inadequate to properly safeguard the health, safety, morals, peace
and general welfare of the inhabitants of the City of Grapevine, Texas, creates an
emergency for the immediate preservation of the public business, property, health, safety
and general welfare of the public which requires that this ordinance shall become effective
from and after the date of its final passage, and it is accordingly so ordained.
PASSED AND APPROVED BY THE CITY COUNCIL OF THE CITY OF
GRAPEVINE, TEXAS on this the 6th day of August, 2024.
APPROVED:
William D. Tate
Mayor
ATTEST:
Tara Brooks
City Secretary
/_\»Ys]T/210WAR 2to] Eel V&I
Matthew C.G. Boyle
City Attorney
Ordinance No. 2023-063 2