SOW Richfield LFG OMM 2026.pdf

SCOPE OF WORK

RICHFIELD LANDFILL

LANDFILL GAS OPERATION, MAINTENANCE & MONITORING

(OMM)

File No.: 761/26433.SAR Background:

The Richfield Landfill is an abandoned landfill located at 11145 East Mount Morris Road, Davison, Michigan 48423. The property is in Richfield Township, Genesee County, Michigan (northeast of Flint and just north of the Holloway Reservoir) (see Figure 1, Attachment 1). The landfill property is approximately 300 acres in size, with approximately 79 acres of existing landfill footprint. Richfield Landfill, Inc. (RLI) operated Richfield Landfill from 1966 to February 2013. In that time a total of 6,764,398 tons of waste was disposed of at the Richfield Landfill. The Michigan Department of Environment, Great lakes, and Energy (EGLE) Materials Management Division (MMD) has been maintaining the site since February 2013 when RLI filed for bankruptcy.

EGLE does not own the landfill, nor any of the properties on which it is situated.

Existing landfill cells (see Figure 2, Attachment 1) 1A, 2A, 2B, 2C, and 3 have a cap and are believed to be structurally stable but require regular leachate removal and normal maintenance activities. Cell 1A is capped with a 24-inch thick low-permeability soil cap. Cells 2A, 2B, 2C, and 3 have a 48-inch-thick cap which includes 18-inches of low permeability soil, overlain by a 40-mil thick linear-low density polyethylene (LDPE) geomembrane overlain by a geocomposite and 30-inches of cover soils.

The Old Fill Area (see Figure 2, Attachment 1) was constructed (per the regulations at the time) without a leachate collection system. The Old Fill Area has a soil cap consisting of 2-feet of clay, 6-inches of granular material, a 21-inch vegetation zone, and 3-inches of topsoil.

An active landfill gas collection system was constructed at the Richfield Landfill in 2006.

This initial construction consisted of 19 vertical wells in the Old Fill Area and Cell 1.

Over time the landfill gas collection system has grown to match the growth of the landfill. Currently, there are 59 gas wells installed throughout the landfill. Since 2006 the gas collection system has been operated by a third-party, separate from RLI, known as Blue Skies Energy (BSE). BSE collects the landfill gas, processes the gas, and sells the gas to the TC Energy pipeline that runs along the northern edge of the landfill. The quality of gas produced by the landfill has fallen. This gradual decrease in gas quality, among other factors, has made the gas collection facility at the Richfield Landfill unprofitable for BSE to operate. BSE has chosen to cease operating the gas collection system at the end of September, 2026. Without BSE selling gas to the pipeline the landfill will be relying solely on the gas blower and flares.

Given the volume of gas generated by the Richfield Landfill EGLE has a responsibility to operate the landfill’s flares on an emergency basis for the foreseeable future. EGLE is

Richfield Landfill LFG OMM 761/26433.SAR seeking the services of an experienced contractor to operate and maintain the landfill gas collection facility on an annual basis.

The gas collection system at the Richfield Landfill utilizes a HOFFMAN & LAMSON multistage centrifugal blower. The gas collection system at the Richfield Landfill is equipped with a primary and secondary flare. The primary flare is an enclosed flare.

The secondary flare is a 25-foot, 4-inch Tank Battery Flare complete with a AC/AL Ignition Control System (see Attachment 2). The secondary flare is designed with a maximum inlet flow rate of 1-2 mmscfd.

There is a 6,000-gallon underground storage tank at the landfill gas facility used for the storage of landfill gas condensate. This tank is typically emptied once per month.

Leachate removal activities and landfill gas condensate removal activities are conducted under a separate contract (with Young’s Environmental Cleanup Inc.). The leachate contractor has set a regular schedule to remove leachate and condensate, as necessary, from on-site storage facilities.

The composition of the landfill gas at the inlet of the treatment facility is typically:

Methane (CH4): 50% - 54% Carbon dioxide (CO2): 35% - 37% Nitrogen N2: 5.5% Oxygen (O2): Less than 1% Hydrogen sulfide (H2S): 3-4 ppm

Proposed Scope of Work:

EGLE MMD is requesting a proposal for professional services from a qualified contractor (Contractor) to perform the scope of work listed in this section. The Contractor will provide system operation, maintenance, and monitoring; surface emission monitoring; and reporting for a one-year assignment period beginning 10/01/2026 and ending 10/01/2027. The proposal must clearly acknowledge the start and end dates. The contract may be renewed annually based on funding and site needs. The following tasks are requested as part of this assignment:

Task 1 – Initial Assessment of the Gas Collection System

The Contractor will perform an initial assessment of the gas collection system including the wellheads and flares. This assessment will be performed in the first month of the contract. The results of this assessment will be documented in a report delivered to EGLE. The goal of this assessment is to identify any necessary repairs needed for the gas collection system.

I. Assessment of the Wellheads:

The Contractor will perform an initial assessment of the landfill’s wellheads. The assessment will include:

1. Utilizing a Flame Ionization Detector (FID) to determine if there are any gas leaks at the wellheads.

2. Assess the condition of the wellhead components:

a. Are the hoses intact?

b. Are the fernco flexseal couplings intact?

c. Are the flow control valves working?

d. Are the sampling ports intact?

II. Assessment of the Flares:

The Contractor will perform an initial assessment of the landfill’s flares. This includes the landfill’s primary enclosed flare and the secondary 4-inch flare. Establish if each of the flares is in working order. Determine if any components of the flare, and ancillary features, are in need of repair or adjustment.

Task 2 – Gas Collection Facility Operation, Maintenance, and Monitoring

The Contractor shall operate the landfill’s gas collection facility for a period of one year on behalf of EGLE-MMD. EGLE-MMD would be responsible for the payment of all electrical utility bills related to the operation of the gas collection facility.

I. Operate & Maintain the Flares:

The Contractor shall perform monthly inspections of each flare. These tasks may include checking the igniters and pilots, inspecting and cleaning flame arresters, performing gas line inspections, and testing mechanical components of the flare.

II. Operate & Maintain the Blower:

The Contractor shall operate and maintain the blower in order to maintain a sufficient vacuum on the landfill’s gas wells. Maintenance will include lubrication of the blower with AEON CF Lubricating Grease per the manufacturer’s recommendations.

Task 3: - Gas Collection System Monitoring

The Contractor shall perform the following tasks for monitoring of the landfill gas collection system:

1. Perform monthly monitoring of the gas collection system. This monitoring will include the measurement of the following parameters at each of the active landfill gas extraction wells and at the sampling port on the gas header located just prior to entering the gas plant:

a. Methane

b. Oxygen

c. Carbon dioxide

d. Balance Gas

e. Temperature

f. Vacuum/Pressure

g. Liquid Levels

Task 4: Wellhead Tuning

The Contractor will utilize the information collected under Task 3 in order to perform monthly tuning of the landfill gas wellheads in order to maximize methane recovery and control odors, while preventing atmospheric air from being pulled into the waste mass.

Currently, our goal is to achieve 50%-52% Methane recovery concentrations at the wellheads.

Task 5: Project Administration

The Contractor shall administer and manage the project to ensure all tasks are completed adequately.

The Contractor shall provide a monthly progress report (to accompany the Contractor’s Invoice) that summarizes the work completed during the period, projected work for the next period, identifies planned submittals, identifies issues encountered, and presents all other pertinent information. The progress report(s) and the invoice for the previous month shall be submitted to EGLE during the first week of the following calendar month.

Task 6: Annual and Emergency Repairs Provisionary Allowance

This allowance covers both the fees and reimbursables that may be incurred for completing annual and emergency repairs as identified by EGLE and the Contractor.

EGLE will continue to inspect the landfill and decide on necessary maintenance activities. EGLE staff will identify specific tasks to be completed by the Contractor. Prior to conducting an assigned maintenance activity, Contractor will:

1. Provide an estimate of costs for all necessary maintenance work including labor and material costs, on an as needed basis.

2. With EGLE concurrence, secure sub-contractors (follow competitive bidding depending on the time sensitivity of the task) necessary to complete the maintenance activities.

3. Oversee sub-contractor activities.

4. Review and make recommendations regarding sub-contractor invoices. The sub-contractor will be paid from an emergency/maintenance fund without markup to sub-contractor invoices.

When approved by EGLE, the cost of repairs will be paid from the Annual and Emergency Repairs Provisionary Allowance.

TASK COST SHEET

Task No.

Description Quantity Unit Unit Cost Total

1 Initial Assessment of the Gas Collection System

1 LS

2 Gas Collection Facility Operation, Maintenance, and Monitoring

12 Events

3 Gas Collection System and Extraction Well Monitoring

12 Events

4 Wellhead Tuning 12 Events

5 Project Administration 12 Months

6 Annual and Emergency Repairs Provisionary Allowance

$50,000.00

Total

The task cost sheet must be included in every invoice to denote the percentage (%) billed and % work remaining. Onsite vehicle usage to move field equipment’s, require prior authorization and should be billed as equipment reimbursables on a unit basis.

Attachments:

Attachment 1 – Figure 1, Site Location Map; Figure 2, Site Features Map

Attachment 2 – Operation, Installation, & Maintenance Manual for 25’ OAH Utility Flare w/ Model 100 “Continuum” Ignitor, & AC/CL Control System.

Attachment 3 – Gas Collection and Control System As-Built

Attachment 4 – Exhibit 1. Preliminary LFG Recovery Projection

Attachment 5 – Exhibit 2. LFG Recovery Projection

Attachment 1

Figure 1, Site Location Map

Figure 2, Site Features Map

Site Location

Figure 1

Reference Map

Site Location

Old Fill Area

Existing Cell 1A

Existing Cell 3

Existing Cell 2CExisting

Cell 2A

Existing Cell 2B

Mount Morris Rd

M ea do w

Ln

Frances Rd

E Mount Morris Rd

N H enderson R d

Figure 2

Legend

Landfill Gas Facility

Attachment 2

Operation, Installation, & Maintenance Manual for 25’ OAH Utility Flare w/ Model 100 “Continuum” Ignitor, & AC/CL Control System.

Attachment 3

Attachment 3 – Gas Collection and Control System As-Built

PERMITTED WASTE LIMITS

CELLS 1-4

CELL 2B

CELL 2C

CELL 2A

CELL 1

GW-17

(ABANDONED)

GENERAL NOTES:

1. GAS WELLS 36-40 WERE EXTENDED APPROXIMATELY 4'.

2. CT-2 WAS EXTENDED APPROXIMATELY 4'.

3. CT-2T WAS EXTENDED APPROXIMATELY 8'.

4. EXISTING 6" LATERALS AT WELLS 36, 37 AND 39 WERE RAISED

ABOVE THE CAP FOR THE FUTURE TIE-IN TO WELLS 41-47.

Attachment 4

Exhibit 1. Preliminary LFG Recovery Projection

Annual Total Total LFG Waste Waste LFG Recovery System LFG Recovery from

Disposal In Place Potential Coverage Existing/Planned System Year (tons/yr) (tons) (scfm) (mmcf/day) (mmBtu/yr) (%) (scfm) (mmcf/day) (mmBtu/yr) 2000 0 4,775,000 1,828 2.63 486,056 0% 0 0.00 0 2001 0 4,775,000 1,719 2.47 457,074 0% 0 0.00 0 2002 32,845 4,807,845 1,616 2.33 429,823 0% 0 0.00 0 2003 137,300 4,945,145 1,550 2.23 412,200 0% 0 0.00 0 2004 171,720 5,116,865 1,583 2.28 421,071 0% 0 0.00 0 2005 187,288 5,304,153 1,646 2.37 437,795 0% 0 0.00 0 2006 153,354 5,457,507 1,720 2.48 457,312 0% 0 0.00 0 2007 175,807 5,633,315 1,757 2.53 467,400 43% 758 1.09 201,593 2008 166,641 5,799,956 1,814 2.61 482,354 38% 695 1.00 184,838 2009 134,633 5,934,589 1,858 2.68 494,183 64% 1,197 1.72 318,346 2010 213,159 6,147,748 1,871 2.69 497,510 63% 1,180 1.70 313,825 2011 248,650 6,396,398 1,954 2.81 519,765 61% 1,184 1.70 314,786 2012 368,000 6,764,398 2,066 2.97 549,336 63% 1,292 1.86 343,612 2013 0 6,764,398 2,279 3.28 606,210 65% 1,486 2.14 395,207 2014 0 6,764,398 2,143 3.09 570,060 77% 1,641 2.36 436,430 2015 0 6,764,398 2,016 2.90 536,070 82% 1,658 2.39 440,951 2016 0 6,764,398 1,895 2.73 504,110 86% 1,629 2.35 433,238 2017 0 6,764,398 1,782 2.57 474,059 88% 1,560 2.25 414,888 2018 0 6,764,398 1,676 2.41 445,803 96% 1,601 2.31 425,792 2019 0 6,764,398 1,576 2.27 419,235 95% 1,504 2.17 399,994 2020 0 6,764,398 1,482 2.13 394,253 87% 1,290 1.86 343,080 2021 0 6,764,398 1,394 2.01 370,763 82% 1,147 1.65 305,049 2022 0 6,764,398 1,311 1.89 348,675 84% 1,095 1.58 291,219 2023 0 6,764,398 1,233 1.78 327,906 84% 1,036 1.49 275,441 2024 0 6,764,398 1,160 1.67 308,376 84% 974 1.40 259,036 2025 0 6,764,398 1,090 1.57 290,013 84% 916 1.32 243,611 2026 0 6,764,398 1,026 1.48 272,745 84% 861 1.24 229,106 2027 0 6,764,398 964 1.39 256,507 84% 810 1.17 215,466 2028 0 6,764,398 907 1.31 241,239 84% 762 1.10 202,641 2029 0 6,764,398 853 1.23 226,881 84% 717 1.03 190,580 2030 0 6,764,398 802 1.16 213,380 84% 674 0.97 179,239 2031 0 6,764,398 755 1.09 200,684 84% 634 0.91 168,575 2032 0 6,764,398 710 1.02 188,746 84% 596 0.86 158,546 2033 0 6,764,398 667 0.96 177,519 84% 561 0.81 149,116 2034 0 6,764,398 628 0.90 166,962 84% 527 0.76 140,248 2035 0 6,764,398 590 0.85 157,034 84% 496 0.71 131,908 2036 0 6,764,398 555 0.80 147,698 84% 466 0.67 124,066 2037 0 6,764,398 522 0.75 138,918 84% 439 0.63 116,691 2038 0 6,764,398 491 0.71 130,662 84% 413 0.59 109,756 2039 0 6,764,398 462 0.67 122,897 84% 388 0.56 103,234 2040 0 6,764,398 435 0.63 115,595 84% 365 0.53 97,100 2041 0 6,764,398 409 0.59 108,729 84% 343 0.49 91,332 2042 0 6,764,398 385 0.55 102,271 84% 323 0.47 85,908

MSW C&D

Methane Content of LFG Adjusted to: 50% 50% Selected Decay Rate Constant (k): 0.062 0.047 Selected Ultimate Methane Recovery Rate (Lo 4,300 cu ft/ton 1,480 cu ft/ton

EXHIBIT 1. PRELIMINARY LFG RECOVERY PROJECTION

RICHFIELD LANDFILL, DAVISON, MI

SCS ENGINEERS

CONFIDENTIAL AND PROPRIETARY

© Copyright 1997-2022 SCS Engineers 9/18/2025

Attachment 5

Exhibit 2. LFG Recovery Projection

CONFIDENTIAL AND PROPRIETARY

© Copyright 1997-2022 SCS Engineers 9/18/2025

1,000

1,500

2,000

2,500

2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050

LF

G

F lo w a t 5 0%

M et ha ne

(s cf m

EXHIBIT 2. LFG RECOVERY PROJECTION: RICHFIELD LANDFILL,

DAVISON, MI

Recovery Potential Recovery from Existing/Planned System Actual LFG Recovery

PRELIMINARY