HomeMy WebLinkAbout20- Task Order - Tetra Tech - 2020-2021 Remediation Systems Operation and Maintenance Bozeman LandfillOTETRA TECH
TASK ORDER
2020-2021 REMEDIATION SYSTEMS OPERATION AND MAINTENANCE
BOZEMAN LANDFILL
May 26, 2020
CLIENT: CONSULTANT:
The City of Bozeman Tetra Tech, Inc.
P.O. Box 1230 851 Bridger Drive, Ste 6
Bozeman, Montana 59711-1230 Bozeman, MT 59718
Attention: Mr. Shawn Kohtz, PE Attention: Mr. Kirk Miller
INTRODUCTION
The purpose of this task order is to conduct the oversight of operation and maintenance (O&M)
of the landfill gas extraction system (LFGES) and remediation systems at the Bozeman Landfill
and to conduct design of a system expansion to collect landfill gas (LFG) from the Lined Cell.
The scope of work follows work activities from previous years with minor modifications. We have
added a new task (Task 500) to design LFG wells for the Lined Cell, which is located
immediately west of the unlined cell. This recommendation was developed by Tetra Tech based
on one methane measurement collected above the Lined Cell in conjunction with the surface
screening of the unlined cell in 2018. We initially proposed testing of methane concentrations in
the lined cell to identify a timeline for connecting the lined cell to the LFGES. However, upon
further review of the size and history of the Lined Cell and the methane data collected above the
cover in 2018, and discussions with the City, we have modified this recommendation to move
directly into a design phase of adding LFG wells to the lined cell. This task order includes the
following work activities:
• Task 100 — LFG Extraction System Operation & Monitoring
• Task 200 — SVE and Al System Operation & Monitoring
• Task 300 — Leachate/Condensate Underground Storage Tank Monitoring
• Task 400 — Database Entry and Management
• Task 500 — Design of Three New LFG wells for Lined Cell
• Task 600 - Project Management and Reporting
SCOPE OF WORK
Tetra Tech's proposed scope of work is summarized in the following tasks:
Task 100 LFG Extraction System Operation & Monitoring
Tetra Tech will conduct monthly monitoring and adjustment of individual LFG extraction wells,
leachate pumps, and flare/compressor system. In addition, there will be regular service events
for the flare/compressor system. These service events will consist of inspection of the
Tetra Tech
851 Bridger Drive, Suite 6; Bozeman, MT 59715
Tel 406.582.8780 Fax 406.582.8790 tetratech.com
Task Order — 2020-2021 Remediation Systems Oversight
Bozeman Landfill, Bozeman, Montana
May 26, 2020
compressor and compressor filter replacement, flare components inspection and testing, blower
re -greasing, and related activities.
Task 200 SVE and All Systems Operation & Monitoring
Tetra Tech will conduct monthly monitoring and adjustment of individual SVE and Al wells. The
SVE and Al wellheads (within the bolt -down steel manhole covers) will be visually inspected
every six months to ensure air -tight fittings and valves.
Task 300 Leachate/Condensate Underground Storage Tank (UST) Monitoring
Tetra Tech will conduct monitoring of liquid levels in the UST, calculate volume and
accumulation rates, and conduct sampling of the liquid in the UST in accordance with City of
Bozeman Water Reclamation Facility (WRF) requirements. Tetra Tech will also supervise the
pumping and discharge of the leachate and condensate into City of Bozeman sanitary sewer.
An inspection of the newly installed cathodic protection system will be conducted on an annual
basis. Our recommendation to design a system to directly connect the condensate and leachate
produced by the remediation systems with the City sewer, in order to reduce costs, will be
undertaken by the City.
Task 400 Database Entry and Management
Information collected during monitoring and adjustment activities will be placed into a project
database. This database will be maintained and updated following every monitoring event
described in Tasks 100 and 200. The database will be used to evaluate operations and
effectiveness of the systems.
Task 500 Design of Three New LFG Wells for Lined Cell
Tetra Tech will select locations for, and design of, three new LFG wells in the lined cell as well
as piping to connect these wells into the existing LFGES. While this will be a straightforward
project since the well and piping designs will likely mirror the 2016 design, the collection of
condensate from the pipeline and maintaining its drainage to the UST during cold weather will
require a new design effort. The scope of work for this task will include the following:
• Identify the location of the lowest trough of the base liner under the Lined Cell (i.e.,
thickest area of refuse) and select locations, depths and screened intervals for three
LFG wells within that area.
• Develop plans and specifications for three LFG wells, including surface connections and
piping to the existing LFGES, and condensate traps and drain lines. These plans will
extensively use designs from the 2016 LFGES design.
• Assist the City with contracting and contractor selection.
• We anticipate the construction of this system will not occur until the 2021/2022 fiscal
year; hence, no construction costs are included in our cost estimate.
Task 600 Project Management and Reportinq
Project management will include, scheduling of personnel, monitoring equipment/meters, and
activities; communication with City of Bozeman and DEQ; data management; and invoicing.
Reporting will consist of a brief summary of system operation and monitoring provided to City of
Bozeman on a monthly basis, as well as draft and final designs for the lined cell LFG wells.
Tetra Tech's Groundwater and Methane Monitoring Task Order for 2020-21 includes the
development of a 3 to 5 -year plan for larger system improvements and maintenance projects.
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TETRA TECH
Task Order — 2020-2021 Remediation Systems Oversight
Bozeman Landfill, Bozeman, Montana
May 26, 2020
Any needs identified by the work under this Task Order relative to the LFGES and SVE systems
will be incorporated into that plan.
PERIOD OF PERFORMANCE AND COSTS
This task order will be applicable from July 1, 2020 through June 30, 2021. Estimated costs to
complete the scope of work are shown below:
TASK
Estimated
Costs
Task 100 LFG Extraction System Operation & Monitoring
$ 48,475
Task 200 SVE and AIS stems Operation & Monitoring
$ 20,400
Task 300 Leachate/Condensate UST Monitoring
$ 31,194
Task 400 Database Entry and Management
$ 14,280
Task 500 Design of Three New LFG Wells for Lined Cell
$ 8,500
Task 600 Project Management and Reporting
$ 17,451
TOTAL
$140,300
Our costs will be invoiced on a time and materials basis. A detailed cost estimate can be provided
upon request.
SPECIAL CONDITIONS: Execution of this Task Order constitutes acceptance of all terms and
conditions contained in Tetra Tech's Professional Services Agreement with the City of Bozeman,
dated April 15, 2014.
CLIENT:
CONSULTANT:
City of Bozeman Tetra Tech
By: By:
Printe Name: _)eta 1"`�cc.� Printed Name. irkAMiller
Its: ��/ i • l�/�tA,Gr
Date: ��rQ, oda, 010
Its: Senior Project Manager
Date: May 26, 2020
NOTICE OF CONFIDENTIALITY This Task Order (including attachments) contains information confidential to Tetra
Tech, Inc., its subsidiaries, and subcontractors. It is intended only for City of Bozeman to consider Tetra Tech
providing professional services at the Bozeman Landfill. Any other use is prohibited, without the prior written consent
of Tetra Tech.
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TETRA TECH