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HomeMy WebLinkAboutKnapp St Quarries and Timmerman LandfillA= OM AECOM 558 North Main Street Oshkosh, Wi 54901 aecom.mm Mr. James Rabe, PE, CPESC Director of Public Works City of Oshkosh 215 Church Avenue Oshkosh, Wl 54901 RECEIVED NOV 2 6 2019 DEPT OF PUBLIC WORKS OSHKOSH, WISCONSIN November 25, 2019 AECOM Proposal No. OPP-830131 Proposal for Knapp Street Quarries and Timmerman Landfill Operations and Maintenance Support during the 2020 Calendar Year Dear Mr. Rabe, AECOM Technical Services, Inc. (AECOM) has prepared this proposal for continued methane monitoring, sampling, landfill gas collection system operation and maintenance, and reporting at the former Faber Quarry and former Oshkosh Stone Company Quarry (collectively known as the Knapp Street Quarries) and groundwater and methane monitoring, sampling and reporting at the former Timmerman Landfill during the 2020 calendar year (CY2020). This proposal provides a summary of the specific project backgrounds, proposed scope of services and estimated costs for continued environmental monitoring at each site. Task 1 — Knapp Street Quarries Background The scope of services presented below is based on recommendations provided in the Operation Manual and in accordance with Wisconsin Department of Natural Resources (WDNR) Solid Waste requirements. The gas collection system was installed and started operation in 2010. AECOM personnel have continued monitoring the system and continually work at balancing the gas recovery. The system has had a positive influence on the reduction of methane gas and thus reduced the risk of methane migration off -site. At this time the monitoring points show methane concentrations below 2.5% by volume. The WDNR has conditionally approved a plan toward reduced operation of the landfill gas extraction system. That plan requires that there is effective gas recovery when cycling the blower operations (6-hours on and 4-hours off) over a 4-month period and following the closure of sections of vent piping that have had less than detectable readings for methane for a consecutive 12-month period. This plan was initiated in 2015. Prior to and during the test period, system mechanical issues occurred that prolonged the testing program, which included: Replacement of the blower motor (twice, covered by warranty). Replacement of the exhaust stack (collapsed prior to the test commencing). Modifications to the grease tube operation to provide a constant temperature for the equipment. AECOM worked with a contractor to make the repairs and modifications. The testing was completed in September 2016. Based on the results of the reduced -operation testing, and with concurrence from the WDNR, the active system is still required to control landfill gases. Another reduce- operation test will be planned in the next 5 years to verify conditions at that time. In 2016, it was observed that several of the flush -mount protective covers surrounding the monitoring wells located in sidewalk or parking lot pavement were no longer able to protect the integrity of the wells. In 2018, it was observed some of the LFG control vaults had also been damaged. The damage was likely due to age of the structures, damage from snow plowing and damage to the surrounding surface from freeze -thaw cycles (uneven grade). The repairs to the flush -mount protective covers were completed in 2019. The repairs to the vaults may occur in 2020 if any of the proposed budget is unutilized. K:\PROPOSAL\City of Oshkwh\OPP-830131_2020 Knapp St & Iimmeiman\OPP-830131_2020 Knapp St & Timmerman Proposal.dom 1/6 A= 'OM In the summer of 2017, a WDNR Solid Waste Engineer inspected the site. AECOM and City Staff completed the site inspection with the WDNR representative. All items that were identified during this inspection were corrected by AECOM or City staff, and AECOM prepared a letter detailing the corrective actions and submitted it to the WDNR. Scope of Services Methane Gas Monitoring AECOM proposes to continue to conduct methane monitoring activities based on the schedule provided in the WDNR conditional approval letter dated April 15, 2014 and as presented in the chart below: Location Identification Parameters Frequency OW-3, GW-12, GW-20, GW-20A, Oxygen, methane, carbon dioxide, GW-22, GW-23, GW-23A, GW-24, balance gas, groundwater level Monthly GW-24A, GW-25, and GW-25A monitoring, vacuum Gas Monitoring Wells Oxygen, methane, carbon dioxide, GW-2, GW-9, GW-10, GW-11, GW- balance gas, groundwater level Quarterly 14, GW-17, and GW-19 Gas Extraction Wells WHA through WHA5 and W-1 Oxygen, methane, carbon dioxide, Semi -Annually through W-9 balance gas, vacuum Header Pipe at the Blower Blower (inflow) Vacuum before blower Monthly Station Vent Pipe Blower (discharge) Oxygen, methane, carbon dioxide, Monthly pressure after blower, velocity/flow Condensate Sample Point Condensate Sample Point Field pH, TBD If needed NOTES: 1. The following information will be recorded during each sampling event: ambient air temperature, barometric pressure, trends in barometric pressure, ground surface conditions, type of meter used, and latest meter calibration date. 2. Monitoring has since been discontinued in the following gas monitoring wells: GW-1, GW-3, GW-4, GW-5, GW-6, GW-7, GW-6, GW-15, and GW-16 and the following observation wells, OW-1 and OW-2, which were abandoned. 3. WH-7 and W-2 do not exist. At each gas monitoring well and system sampling port the vacuum pressure, initial percent of the LEL of methane (percent LEL methane), percent methane gas (percent methane), percent oxygen (percent 02), percent of carbon dioxide (percent CO2), air flow (CFM), and groundwater levels will be measured. The LEL is the minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air. The LEL of methane gas is 5% methane by volume. Observations (such as ground condition, barometric pressure, and monitoring well conditions) will also be recorded. After initial readings are recorded, monitoring wells will be purged with a pump at a rate of two liters per minute. Continuous percent LEL methane will be measured as the well is purged. A final reading will be recorded when consecutive methane readings are within +10% LEL. Final measurements include percent LEL methane, percent methane gas, percent CO2 and percent 02. The length of time required to achieve the final reading is typically unique to each well. Based on the 2017 WDNR site inspection, AECOM has added a checklist to be completed during each site visit. The checklist includes all items identified during the site inspection. If deficiencies are noted, AECOM staff will inform the City and assist with developing a solution. Schedule and Reporting Methane sampling and system O&M will be completed in accordance with the above schedule through December 2020. The monitoring data will be summarized and electronically submitted to the City and WDNR GEMS database K:\PROPOSAMity of OshkosMOPP-830131_2020 Knapp St & l immerman\OPP-830131_2020 Knapp St & Timmerman Proposal.do" 2/e 4. AECOM on a semiannual basis. On an annual basis, a report will be submitted to the WDNR (including cover letter with discussion and conclusions). AECOM will immediately notify the City of any new methane wells that indicate an exceedance of 25% of the LEL. In 2019, AECOM discussed a potential for reduction of monitoring with WDNR staff. Based on the historical monitoring results, the WDNR indicated they were not willing to consider any reduced monitoring at this time. Task 2 — Timmerman Landfill Background AECOM has been assisting the City with environmental services related to the Timmerman Landfill since 1978. These services have included groundwater and methane monitoring, landfill cap thickness verification, laboratory testing, data review, and closure planning. In response to the WDNR Notice of Violation dated August 2, 2006, AECOM completed a Site Assessment Report (SAR) in compliance with Wisconsin Administrative Code Section NR 700 and subsequently installed three additional groundwater monitoring wells. In 2008 and early 2009, AECOM completed the closure of the site under the WDNR Remediation and Redevelopment (RR) program and the site was transferred to the WDNR Solid Waste Program. In 2010, AECOM recommended the abandonment of six monitoring wells. The WDNR subsequently requested additional investigation regarding the presence of a passive methane collection trench, which AECOM completed using test pits. Based on the results of the test pit investigation and AECOM's recommendation in 2010, the WDNR approved the abandonment of the six wells and required the installation of two gas probes (in addition to the four already installed at the site) for additional methane monitoring in a letter dated February 2013. In the summer of 2017, a WDNR Solid Waste Engineer inspected the site. AECOM and City Staff completed the site inspection with the WDNR representative. All items that were identified during this inspection were corrected by AECOM or City staff, and AECOM prepared a letter detailing the corrective actions and submitted it to the WDNR. In 2019, AECOM submitted a plan modification to the WDNR proposing to reduce the sampling frequency of gas probes from quarterly to semiannually due to low methane concentrations being detected. An exemption was granted in accordance with s. NR500.08(4), Wis. Adm. Code, to reduce gas probe sampling from quarterly to semiannually. The request also proposed to remove volatile organic compound (VOC) sampling for MW-6 and MW-8, and to remove sampling for field parameters (pH, temperature, specific conductance, and turbidity) from the environmental monitoring requirements for groundwater monitoring wells MW-9, and MW-10. This request was approved in the Conditional Closure Plan Approval Modification and Grant of Exemption for Environmental Monitoring at the Closed - Timmerman Farm Landfill, Winnebago County, Monitoring #4203 letter from the WDNR dated October 8, 2019. Scope of Services This proposal includes two rounds (semiannual) of groundwater monitoring, subcontract analytical laboratory services, and project reporting obligations through CY2020. In addition, landfill gas will be monitored semi-annually and reported to the WDNR until approval to discontinue the methane monitoring and abandon the wells is achieved. Groundwater samples will be collected according to the WDNR-approved monitoring requirements in the chart below: Location Parameters Frequency MW-1, PZ-4, PZ-5, MW-6, MW-7, PZ-7, Alkalinity, Chloride, Hardness, Groundwater PZ-7D, MW-8, PZ-1, PZ-8, PZ-9, Elevation, field pH, field temperature, field Semi-annually SQDMW-1, PZ-10 (VOC not required for conductivity MW-6 and 8) Volatile Organic Compounds (VOCs) Annually Groundwater monitoring wells will be purged prior to collecting the samples and field monitoring parameters. KIPROPOSAUCity of Oshkosh\OPP-830131_2020 Knapp St & Timmerman\OPP-830131_2020 Knapp St & Timmerman Proposal.dom 3/6 AECOM Gas monitoring points (GP-1 through GP-6) will be monitored semi-annually for methane, oxygen, and carbon dioxide per the methods described above under the Knapp Street Quarries Scope of Services, as required by the WDNR. Readings for barometric pressure, pressure trend, and temperature will also be collected during monitoring activities. Based on the 2017 WDNR site inspection, AECOM has added a checklist to be completed during each site visit. The checklist includes all items identified during the site inspection. If deficiencies are noted, AECOM staff will inform the City and assist with developing a solution. Schedule and Reporting Groundwater sampling will be completed twice annually (April and October), and gas monitoring will be completed on a semi-annually basis (January, and December 2020). The monitoring data will be summarized and electronically submitted to the City and WDNR on a semi-annual basis. Estimated Fees The following summarizes the proposed tasks and estimated fees: Task Fee Task 1 — Knapp Street Quarries Methane Monitoring and System Maintenance and Operation during CY2020 Includes H2O level meter, methane meter, CO2 and 02 meter and rental costs $fir g50 WDNR Reporting, GEMS Database Updates, and Project Management $13,200 Task 1 Total $49,050 Task 2 — Timmerman Landfill Groundwater (2 events)/LFG Monitoring (2 events) during CY2020 Includes H2O level meter, methane meter, CO2 and 02 meter rental costs $14,650 Subcontracted Laboratory $2,500 WDNR Reporting, GEMS Database Updates, and Project Management 6 400 Task 2 Total Total Project Fees $72,600 Please note, AECOM was able to reduce the overall 2020 budget by $1,200 as compared to 2019 by obtaining the approved Plan Modification of reduced monitoring for Timmerman Landfill. This reduction in cost will continue into the future as long as site conditions do not negatively change. Future Services to be Combined with Knapp Street Quarries and Timmerman Landfill We anticipate the installation, start-up, and operation of the Kienast and Paulus Quarry landfill gas collection system will occur in 2020. Startup, operation, and maintenance costs for 2020 associated with the Kienast and Paulus Quarry landfill gas system will be incorporated in the construction management agreement for that project. In 2021, these services are anticipated to be incorporated in the 2021 Landfill Operation and Maintenance Agreement. By combining these services on the multiple sites, AECOM anticipates there will be cost savings to the City during the operation and maintenance of these sites by effectively scheduling the work required consecutively and in a cost effective and timely manner. K:\PROPOSAUCity of Oshkosh\OPP-8301312020 Knapp St & Timmerman\OPP-830131 2020 Knapp St 8 Timmerman Pmposal.doa 416 AECOM Terms and Conditions If services to be provided under this proposal require the agents, employees, or contractors of AECOM to enter onto the Project site, Client shall provide right -of -access to the site to AECOM, its employees, agents, and contractors, to conduct the planned field observations or services. The services described in this proposal will be provided on a time - and -material basis. AECOM will not exceed the above estimate without your authorization and approval. The services provided will be performed in accordance with the approved Fee schedule and with the conditions of the 2009 City of Oshkosh Negotiated General Conditions of Service, which are expressly incorporated into, and are an integral part of, our contract for professional services. To initiate this work, please sign and return the attached Authorization to the AECOM Oshkosh, Wisconsin office. Our understanding is that the City of Oshkosh will also issue a Purchase Order for all approved tasks. Please reference the AECOM proposal number, OPP-830131, in the Purchase Order that is forwarded to the AECOM Oshkosh Office. We are looking forward to working with you and providing assistance with this project. If you have any questions or need to clarify a point, please call any of the undersigned at 920-235-0270 Yours sincerely, Technical Services, Inc. omas, P.E. (WI) Kevin Brehm, P.E. (WI) e Associate Vice President enclosure: Authorization K:\PROPOSALOty of Oshkosh\OPP-830131_2020 Knapp St & Timmerman\OPP-830131_2020 Knapp St & Timmerman Proposal.docx 5/6 A= OM 558 N Main Street Oshkosh, Wisocnsin 54901 920.236.6710 Authorization November 25, 2019 I hereby certify that the necessary provisions have been made to pay the liability, which will accrue under this contract. I hereby authorize AECOM to proceed with the scope of work for Knapp Street Quarries and Timmerman Landfill Operations and Maintenance Support during 2020 Calendar Year as described in AECOM's proposal OPP-830131 dated November 25, 2019, with a budget authorization of $72,600 under the general terms and conditions specified in the proposal. Signat re Mark A Rohloff Print Name City Manager Title/Orr nization C Signature Pamela R. Ubrig Print Name City Clerk Title/ ganization oul� Lynn A.Lorenson Print Name City Attorney Title/Organization y Signature Russ Van Gompel Print Name Director of Finance Title/Organization Date ( 3�Pl 9 Date Date 1a/��/� Date K:\PROPOSAL\City of Oshkosh\OPP-830131_2020 Knapp St & Timmerman\OPP-830131_2020 Knapp St & Timmerman Proposal.docx 6/6