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Home My WebLink About06-22-20 City Commission Packet Materials - C12. TO for FY21 Remediation Systems Oversight at Story Mill (Bozeman) Landfill Commission Memorandum REPORT TO: Honorable Mayor and City Commission FROM: Shawn Kohtz, City Engineer SUBJECT: Task Order Fiscal Year 2021 Remediation Systems Operations and Maintenance, Bozeman Landfill AGENDA ITEM TYPE: Consent MEETING DATE: June 22, 2020 RECOMMENDATION: Authorize the City Manager to execute the attached Task Order for fiscal year 2021 Remediation Systems Oversight, Bozeman Landfill. BACKGROUND: The purpose of this task order is to allow Tetra Tech to continue oversight of operation, monitoring, and maintenance of the remediation systems at the Bozeman Landfill. This task order also includes design of three new landfill gas extraction wells, which were identified as a need in the fiscal year 2020 monitoring. Construction of the new wells will be per a separate contract. This task order will be implemented under the professional services agreement referenced here: http://weblink.bozeman.net/WebLink8/0/doc/63070/Electronic.aspx. UNRESOLVED ISSUES: None. FISCAL EFFECTS: The cost of this work will be $140,300.00. This work will be paid for with solid waste funds dedicated to this purpose. Approval of this task order is contingent on approval of this element of the Final Budget. ALTERNATIVES: As suggested by the City Commission. Attachments: Task Order 2020 - 2021 Remediation Systems Operations and Maintenance, Bozeman Landfill 161 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 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 AI 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 162 Task Order – 2020-2021 Remediation Systems Oversight Bozeman Landfill, Bozeman, Montana May 26, 2020 Page 2 of 3 TETRA TECH compressor and compressor filter replacement, flare components inspection and testing, blower re-greasing, and related activities. Task 200 SVE and AI Systems Operation & Monitoring Tetra Tech will conduct monthly monitoring and adjustment of individual SVE and AI wells. The SVE and AI 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 Reporting 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. 163 Task Order – 2020-2021 Remediation Systems Oversight Bozeman Landfill, Bozeman, Montana May 26, 2020 Page 3 of 3 TETRA TECH 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 AI Systems 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: Printed Name: Printed Name: Kirk A Miller Its: Its: Senior Project Manager Date: 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. 164