Exhibit 1 - Agenda Information Sheet - Change Order 1City of Denton
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AGENDA INFORMATION SHEET
DEPARTMENT: Procurement & Compliance
ACM: David Gaines
DATE: July 20, 2021
SUBJECT
Consider adoption of an ordinance of the City of Denton, a Texas home-rule municipal corporation,
authorizing the approval of Change Order No. 1 to the contract between the City of Denton and Hammett
Excavation, Inc., for the excavation and construction of Cell 4 at the City of Denton Landfill; providing for
the expenditure of funds therefor; and providing an effective date (IFB 7540 – Change Order No. 1 in the
not-to-exceed amount of $72,606.50, for a total contract award aggregated to $3,320,581.34). The Public
Utilities Board recommends approval (5 - 0).
INFORMATION/BACKGROUND
On February 23, 2021, the City entered into a contract with Hammett Excavation for the excavation and
construction of Landfill Disposal Cell 4. During excavation, excessive moisture from the unseasonably high
rainfall experienced during the recent months was discovered, which has impacted the foundation soils.
Wet soils do not have sufficient strength to support the construction of the liner system. Groundwater has
been encountered much farther south than in past construction projects and beyond the limits of the existing
and proposed groundwater underdrain.
The purpose of the change order is to extend the underdrain system an additional 225 feet south of the
original underdrain limits for construction of the Landfill Cell 4 liner. Dewatering is required by Texas
Commission on Environmental Quality rules and the Landfill Permit to prevent hydrostatic uplift of the
landfill liner and to provide excavation stability during construction. When waste is placed in the cell upon
completion, its weight is used in ballast calculations to determine when hydrostatic uplift is no longer a
concern. Sufficient waste ballast counteracts the hydrostatic uplift force, at which time the underdrain no
longer requires maintenance. Sufficient ballast is expected to be placed within six to nine months of opening
the cell for waste disposal.
PRIOR ACTION/REVIEW (COUNCIL, BOARDS, COMMISSIONS)
On February 23, 2021, City Council approved a contract with Hammett Excavation, Inc., in the not-to-
exceed amount of $3,247,974.84 (Ordinance 21-233).
On July 12, 2021, the Public Utilities Board (PUB) recommended this item to the City Council for
consideration.
City Hall
215 E. McKinney Street
Denton, Texas
www.cityofdenton.com
RECOMMENDATION
Award Change Order No. 1 with Hammett Excavation, Inc., for the excavation and construction of Cell 4
at the City of Denton Landfill, in the not-to-exceed amount of $72,606.50, for a total contract amount of
$3,320,581.34.
PRINCIPAL PLACE OF BUSINESS
Hammett Excavation, Inc.
Dodd City, TX
ESTIMATED SCHEDULE OF PROJECT
This project will be started upon approval with a completion date by December 2021.
FISCAL INFORMATION
These services will be funded from Solid Waste Project Funds.
EXHIBITS
Exhibit 1: Agenda Information Sheet
Exhibit 2: Original Ordinance and Contract
Exhibit 3: Ordinance and Change Order 1
Respectfully submitted:
Lori Hewell, 940-349-7100
Purchasing Manager
For information concerning this acquisition, contact: Arturo Garcia, 940-349-8021.
Legal point of contact: Marcella Lunn at 940-349-8333.