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Home My WebLink About17- Task Order - Tetra Tech - 2017-2018 Remediation Systems Oversight at the Bozeman Landfill TETRA TECH r 'JUL 0 3 2017 TASK ORDER 2017-2018 REMEDIATION SYSTEMS OVERSIGHT BOZEMAN LANDFILL June 28, 2017 CLIENT: CONSULTANT: The City of Bozeman Tetra Tech, Inc. P.O. Box 1230 851 Bridger Drive, Ste 6 Bozeman, Montana 5971 1-1 230 Bozeman, MT 59718 Attention: Mr. Rick Hixson Attention: Mr. Mark F. Pearson, Mr. Kirk Miller INTRODUCTION 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. The duration of this task order is one year. In August 2016 the remediation systems began operation. These consist of a landfill gas (LFG) extraction system, pumps installed in selected LFG wells to removed leachate, a soil vapor extraction (SVE) system, and an air injection (AI) system. LFG and SV are burned in an enclosed flare system that includes two regenerative blowers, air compressor, and instrumentation. In addition, leachate and LFG condensate is collected in a 4,000 gallon underground storage tank. SCOPE OF WORK Tetra Tech's proposed scope of work is summarized in the following tasks: Task 100. LFG Extraction System, Leachate Pumps, and Flare System Tetra Tech will conduct monthly monitoring and adjustment of individual LFG extraction wells, leachate pumps, and flare/compressor system. The monitoring will consist of field measurements of pressure, air flow, and fixed gases (methane, carbon dioxide, oxygen, and balance nitrogen) in each LFG extraction well. Operation of the leachate pumps in the LFG extraction wells will be monitored, maintenance, and pumps/components will be repaired and/or replaced as necessary. Above ground components of each well will be inspected and replaced, if necessary. There will be a one year warranty inspection of all the components of the remediation systems in early August 2017. This will include the flare system. In addition, there will be quarterly service events for the flare/compressor system. These service events will consist of inspection of the compressor and compressor filter replacement, flare components inspection and testing, blower lubrication, and other related activities. Tetra Tech 851 Bridger Drive, Suite 6; Bozeman, MT 59715 Tel 406.582.8780 Fax 406.582.8790 tetratech.com Task Order—2017-2018 Remediation Systems Oversight Bozeman Landfill, Bozeman, Montana June 28, 2017 This task includes an additional budget of $8,000 to install a leachate pump in LFG extraction well GW-18. There is also additional budget of $10,000 for anticipated equipment/component repair or replacement. Task 200. SVE and All SVstems Tetra Tech will conduct monthly monitoring and adjustment of individual SVE and Al wells. The monitoring will consist of field measurements of pressure, air flow, fixed gases, and volatile organic compound (VOC) quantity (using a photoionization detector) in each SVE well. Al well monitoring will consist of field measurements of pressure and air flow into each Al well. Faulty valves or fittings may be replaced as necessary. The SVE and Al wellheads (within the bolt- down steel manhole covers) will be visually inspected every six months to evaluate whether fittings and valves are air-tight. Faulty fittings and/or valves will be replaced as necessary. It is anticipated that some of the Al wells will need to be cleaned out, by a drilling contractor, every six months to maintain sediment-free well screens. In addition during the site visit, the retained drilling contractor will be directed to LFG extraction well GW-18 to remove an obstruction in order to install a leachate pump. This task includes an additional budget of $5,000 for equipment/component repair or replacement. Task 300. Leachate/Condensate UST Tetra Tech will conduct sampling of the liquid in the leachate/condensate collection underground storage tank (UST) on a monthly basis. The sample will be analyzed by Pace Analytical. Results will be forwarded to City of Bozeman Water Reclamation Facility (WRF) for approval to discharge leachate/condensate to the sanitary sewer. Tetra Tech will also initially conduct monitoring of liquid levels in the UST on at least a weekly basis. The monitoring frequency may increase or decrease if the rate at which liquids collect in the UST changes. The liquid levels will be used to calculate leachate volume and rate of accumulation in the UST. When the UST gets close to being at its 4,000 capacity, Tetra Tech personnel will supervise pumping of the UST and discharge of the liquid into City of Bozeman sanitary sewer. Currently Scenic City of Belgrade, Montana conducts pumping of the UST and invoices the City of Bozeman. We anticipate the rate at which liquid accumulates in the UST will decrease with time. To reduce the potential for corrosion and leaks developing in the UST, Tetra Tech personnel will supervise the installation of cathodic protection for the UST. Cathodic protection of USTs is a common practice utilizing the electrical properties of corrosion of metallic substances to provide protection against corrosion of steel USTs. Following the installation of the cathodic protection, inspection of the cathodic protection system will be conducted on an annual basis. Task 400. Data Management Information collected during monitoring and adjustment activities have historically been managed in separate Excel files for each of the different media (air, water etc.) with data exported for individual report tables. We propose to integrate more of the remediation system monitoring data into Access data bases, which will allow a broader range of data presentation and analysis options across all of the data (e.g., vacuum, pressure, vapor monitoring, and groundwater monitoring). This will entail some set up time to build the Access databases and to format queries to build the tables needed for the groundwater monitoring report, remediation system evaluation report etc., however, ultimately it will be a more manageable cost-effective system. This database will be maintained and updated following every monitoring event Page 2 of 4 TETRA TECH Task Order—2017-2018 Remediation Systems Oversight Bozeman Landfill, Bozeman, Montana June 28, 2017 described in Tasks 100 and 200. The Access database will facilitate evaluation of system operations and analysis of the remediation systems both for monthly adjustment and system groundwater evaluation reporting. This would also facilitate the linking of these databases to the City's soil vapor intrusion website to provide City personnel with direct access to all of the landfill data, if the City decides in the future that it needs that kind of access. Task 500. Protect Management and Reportinq Project management tasks will include scheduling and oversight of project personnel, oversight of subcontractors, replacement or repair of equipment, budget management, communication with City of Bozeman and DEQ, invoicing, and planning of future work. In addition, a senior landfill engineer will review monitoring information on a monthly basis and provide recommendations on adjustments to the remediation systems. There will be a brief summary contained in Tetra Tech's monthly status and invoice memorandum confirming operation of the remediation systems, a summary of maintenance or repair of components, and any other activities of note. This memorandum will be submitted to City of Bozeman on a monthly basis. PERIOD OF PERFORMANCE AND COSTS This task order will be applicable from June 2017 until May 2018. Estimated costs to complete the foregoing scope of services are in shown below: ESTIMATED COSTS TASK ORDER -2017-2018 REMEDIATION SYSTEMS OVERSIGHT BOZEMAN LANDFILL Task Description Estimated Cost Task 100. LFG Extraction System, Leachate Pumps,and Flare System $71,660 Task 200. SVE and Al Systems $18,400 Task 300. Leachate/Condensate UST $33,531 Task 400. Data Management $20,400 Task 500. Project Management and Reporting $24,960 TOTAL $168,951 The services conducted and invoicing will be on a time and materials basis. A detailed cost estimate can be provided upon request. Page 3 of 4 TETRA TECH Task Order—2017-2018 Remediation Systems Oversight Bozeman Landfill, Bozeman, Montana June 28, 2017 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: Citv of Wozeman Tetra Tech By: By< < Printed Name: Printed Name: Kirk A Miller Its: /I Cvl 4� Q Its: Project Manager V Date: to " 1-7 Date: June 28, 2017 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. Page 4 of 4 TETRA TECH