Every document the monitor has read for these facilities, newest first. The list runs back to the earliest record in the state's filing system and updates automatically as new documents come in.
2026-08-27 · Arbor Hills Remediation Area · procedural · routine
GFL's Arbor Hills Landfill responded to an EGLE Air Quality inspection observation of discolored water in stormwater ditches (June 2026). The company attributed the appearance to compost tannins rather than landfill leachate, implemented corrective regrading and soil additions, and committed to enhanced erosion-control practices including berms, check dams, blankets, and retention ponds.
Key data point: Four locations observed in north perimeter stormwater ditch during June 2026 Air Quality inspection; GFL attributed discoloration to finished compost runoff following heavy rain, not leachate breakout.
2026-08-27 · Arbor Hills Remediation Area · procedural · notable
EGLE inspector Matt Konieczki raised concerns about potential leachate breakouts observed during a June 2026 air quality inspection at Arbor Hills. GFL responded that the dark-colored water was discolored stormwater runoff picking up finished compost from recently seeded slopes, not actual leachate, and committed to erosion control measures (mulch, erosion blankets) to prevent similar appearances in the future.
Key data point: Four locations along north perimeter stormwater ditch observed during June 16, 2026 Air Quality inspection; GFL attributed to compost-stained stormwater runoff rather than leachate breakout.
2026-08-27 · Arbor Hills Landfill · procedural · routine
EGLE's Air Quality Division is submitting a request for extension regarding perimeter monitor action level exceedances at the Arbor Hills Landfill (SRN N2688). The document is a cover letter transmitting a detailed attachment about air quality monitoring violations.
Key data point: No specific factual readings provided in cover letter; detailed measurements are in the referenced attachment which is not included here.
2026-08-26 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
GFL-Arbor Hills Landfill has submitted a joint state-federal wetland permit application (HQK-4R25-67T36) to dredge 26,876 cubic yards and place 76,193 cubic yards of fill in 3.78 acres of wetland, citing PFAS source-area elimination and downstream water-quality improvement. The project includes 6.49 acres of compensatory mitigation in Salem Township within the Rouge River watershed and is subject to a 20-day public comment period ending approximately mid-September 2026.
Key data point: 3.78 acres of wetland proposed for dredge/fill due to PFAS contamination; project in Salem Township, Washtenaw County; EGLE processing deadline November 19, 2026.
2026-08-26 · Arbor Hills Landfill (Land & Water Interface) · procedural · notable
GFL filed a Joint Permit Application (JPA) with EGLE/USACE on August 26, 2026, proposing to dredge and fill 3.78 acres of wetland at Arbor Hills Landfill to eliminate PFAS source areas and improve downstream water quality, with compensatory mitigation of 6.49 acres. The public notice opened a 20-day comment period (August 26 – September 15, 2026) under Part 303 Wetlands Protection.
Key data point: 26,876 cubic yards dredged, 76,193 cubic yards fill, 3.78 acres wetland impact, 6.49 acres compensatory mitigation, proposed to eliminate PFAS source area.
2026-08-26 · Arbor Hills Landfill · procedural · notable
EGLE approves a 120-day extension (until December 19, 2026) for Arbor Hills Landfill to complete corrective actions addressing perimeter methane monitor exceedances in August 2026. The facility reported frequent readings exceeding 40 ppm and attributed the issue to reduced vacuum pressure in Cells 6A and 6B, requiring a system upgrade that cannot be completed within the standard 48-hour compliance window.
Key data point: Perimeter methane monitors recorded frequent readings exceeding 40 ppm in August 2026, with some EGLE surface emission monitoring locations at greater than 500 ppm.
2026-08-25 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
Arbor Hills Landfill (AHLF) seeks a Joint Permit Application to excavate and fill approximately 3.78 acres of contaminated wetland (Wetland 1) to permanently eliminate a PFAS source resulting from a 2016 fire at an adjacent recycling facility. The project addresses Violation Notice VN-011821 and proposes 6.49 acres of compensatory mitigation wetland creation at a nearby site within the Johnson Drain corridor.
Key data point: PFAS contamination confirmed in Wetland 1 surface water and sediments (May 2026); groundwater seep from Wetland 1 into Pond 3 below railroad tracks identified as active contaminant pathway to Outfall 001.
2026-08-24 · Emerald RNG · procedural · routine
This is a Renewable Operating Permit (ROP0000236 v3.0) issued by Michigan EGLE to Emerald RNG LLC for the Arbor Hills Landfill facility (SRN P1488) located at 10719 West 5 Mile Road, Northville, Washtenaw County. The permit establishes operating conditions, emission limits, monitoring, and recordkeeping requirements for the landfill gas energy recovery and treatment systems, including the thermal oxidizer (EURNGTOX) and RNG plant equipment.
Key data point: Thermal oxidizer must maintain minimum 1,450°F destruction temperature; NOx limit 0.06 lb/MMBTU hourly and 11.1 tpy annually; CO limit 0.20 lb/MMBTU hourly and 37.0 tpy annually; H2S/TRS monitoring required weekly when turbines operate, semi-annually by EPA method, with 20 ppmv threshold triggering increased monitoring.
2026-08-24 · Emerald RNG · procedural · routine
This is a staff report for Emerald RNG LLC's Renewable Operating Permit (ROP) renewal under Michigan air quality regulations. Emerald RNG processes landfill gas from Arbor Hills Landfill into pipeline-quality renewable natural gas, with backup controls including a thermal oxidizer and flare. The facility is subject to federal and state air quality requirements, including Title V permitting, NESHAP standards, and previous enforcement actions resulting in a Consent Judgment and Consent Decree.
Key data point: No specific quantitative environmental violations, measurements, or exceedances are reported in this procedural permit document; actual emissions for 2025 were: CO 41 tons/year (potential 87.4), NOx 9 tons/year (potential 22.1), PM10 and PM2.5 each 15 tons/year.
2026-08-24 · Arbor Hills Landfill · procedural · routine
GFL submitted an air quality stack test report for Arbor Hills Landfill on 08/24/2026, conducted on 07/29/2026 by Impact Compliance & Testing, Inc. The submission references an approved test plan (4CAS-QG12-5RCD) and includes a detailed test report package, with certification by facility contact Anthony Testa that the information is true and accurate.
Key data point: No specific emission readings or pollutant concentrations are visible in this form submission; the actual test results are contained in the attached 'Arbor Hills Test Report Package 2026 (Updated).pdf' which is not provided in the extracted text.
2026-08-24 · Arbor Hills Landfill · evidence · routine
This is an nForm air monitoring report filed 2026-08-24 documenting emissions test results for enclosed flares at an unspecified facility. The document reports nitrogen oxides and carbon monoxide measurements across three test runs, with results well below Michigan Air Pollution Control Rule limits.
Key data point: Nitrogen oxides: 0.027 lb/mmbtu (limit 0.060); carbon monoxide: 0.01 lb/mmbtu (limit 0.20) — all runs reported zero, three-run average well below permit limits.
2026-08-24 · Arbor Hills Landfill · evidence · routine
Emissions test results for two enclosed flare units (391 and 392) at a municipal solid waste landfill, measuring nonmethane organic compounds (NMOC) under EPA Method ALT-097. Both units show very low NMOC levels, well below the 20 ppmvd@3%O2 permit limit.
Key data point: EUENCLOSEDFLARE1 and EUENCLOSEDFLARE2: NMOC three-run average 0.00 ppmvd@3%O2, measured against 20 ppmvd@3%O2 permitted limit per 40 CFR Part 63 Subpart AAAA.
2026-08-24 · Arbor Hills Landfill · evidence · routine
Air emission test report for Arbor Hills Landfill's two enclosed flares (391 and 392), conducted July 29, 2026 under PTI No. 79-17 compliance requirements. Testing measured NMOC, CO, and NOx emissions using EPA-approved methods; all measured pollutant concentrations were well below permit limits.
Key data point: CO concentrations measured at 14.72 ppmvd (flare 391, 3-test average) and 5.41 ppmvd (flare 392, 3-test average); both far below CO permit limit of 0.20 lb/MMBtu. NOx measured at 0.025 lb/MMBtu (391) and 0.030 lb/MMBtu (392), below 0.060 limit. NMOC at detection limit (0.00 ppmvd), below 20 ppmvd permit limit.
2026-08-24 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
GFL has applied to EGLE under Part 303 (Wetlands Protection) for a permit to dredge ~26,876 cubic yards and place ~76,193 cubic yards of fill across 3.78 acres of wetland, citing PFAS source-area elimination and downstream water-quality improvement. The project includes 6.49 acres of compensatory mitigation in Salem Township. Public comment period is 20 days from August 26, 2026.
Key data point: No specific factual measurements or violations reported. The document is a procedural public notice with project scope (26,876 cy dredged; 76,193 cy fill; 3.78 acres impacted; 6.49 acres mitigation).
2026-08-21 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
This document is a Conceptual Wetland Mitigation Plan submitted by GLF on behalf of Arbor Hills Landfill in response to a South Wetland project that will impact approximately 3.78 acres of existing wetland (Wetland W1). The applicant proposes to mitigate the loss by creating/restoring 6.49 acres of primarily palustrine forested wetland (PFO) and open-water habitat approximately 1.5 miles west of the landfill, in Salem Township within the same Rouge River Watershed. The plan includes detailed specifications for grading, water-level control structures, native plantings, and habitat features.
Key data point: No specific factual readings or violation data. This is a mitigation design document; it contains planned acreages (3.78 acres impacted, 6.49 acres to be created) and soil/hydrologic specifications, but no measured environmental data or regulatory violations.
2026-08-21 · Arbor Hills Landfill (Land & Water Interface) · procedural · notable
Arbor Hills Landfill, Inc. (AHLF) has submitted a Joint Permit Application (JPA) to excavate and fill 3.78 acres of contaminated wetland (Wetland 1) to resolve PFAS (perfluorooctanesulfonic acid) violations stemming from a 2016 fire at an adjacent facility. The remediation involves dewatering the wetland, excavating contaminated sediments to an average depth of two feet, backfilling with clean soil, and grading to upland conditions. AHLF proposes 6.49 acres of compensatory mitigation wetland creation on an adjacent agricultural field within the Johnson Drain corridor.
Key data point: 3.78 acres permanent wetland impact (2.14 acres PEM, 1.64 acres PFO) to eliminate PFAS source; mitigation ratio 1.5:1 (PEM) and 2.0:1 (PFO) for 6.49 acres creation off-site
2026-08-20 · Arbor Hills Remediation Area · procedural · routine
A PFAS Non-POTW Effluent Monitoring Report filed for Arbor Hills Remediation Area under permit MI0045713 covering May–July 2026. The operator reports no discharge occurred during these months and answers "No" to sampling for PFAS.
Key data point: No discharge occurred May–July 2026; no PFAS sampling was conducted during the reporting period.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
The U.S. Fish and Wildlife Service determined that the proposed Arbor Hills Landfill Expansion Project (project code 2025-0113941) will not result in take of four federally listed species: Indiana Bat, Northern Long-eared Bat, Mitchell's Satyr Butterfly, and Eastern Massasauga Rattlesnake. The applicant must document the rationale for this no-take conclusion in the project record and include it with the EGLE permit application. No official ESA Section 7 consultation or concurrence letter is required, only compliance with Section 9's prohibition on take of endangered wildlife.
Key data point: August 2025 bat acoustic survey indicated probable absence of Indiana and Northern Long-eared Bats in project area; closest Mitchell's Satyr Butterfly population over 25 air miles away; closest Eastern Massasauga Rattlesnake occurrences over 3–7 air miles away with significant development barriers.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
This document is a conceptual wetland mitigation plan map for the Arbor Hills Landfill South Wetland and Expansion Mitigation Areas, showing 11 tiered waste-placement zones with elevations, acreage, and associated mitigation infrastructure (ponds, trails, boardwalks, prairie restoration). It depicts the physical layout and phasing of an expansion project requiring environmental offset.
Key data point: Expansion area mitigation totals 64.49 acres across 11 tiers; Tier 9 is the largest at 16.93 acres with base elevation 949 ft and top-of-berm elevation 950.9 ft.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
Environmental Consulting & Technology, Inc. (ECT) conducted a wetland and waterbody delineation study on approximately 242.5 acres at the Arbor Hills Landfill in Salem Township, Washtenaw County, Michigan in May 2024. The study identified and characterized wetlands, waterbodies, and their regulatory status across the property, which includes old field habitat, bare/excavated ground, compost piles, stormwater ponds, and forested/shrub land. The report documents the methodology used, including desktop review of USGS maps, wetland inventories, soil surveys, and flood maps, followed by field investigation.
Key data point: No specific factual measurements or violations reported; this is a delineation methodology and site-characterization document without quantitative environmental readings.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
This is an engineering site plan for a proposed expansion at Arbor Hills Landfill showing cell layouts, wetland delineations, stormwater infrastructure, and perimeter screening. The document includes surveyed property boundaries, permitted solid waste boundaries, proposed gas transmission line relocation, and wetland mitigation measures including tree plantings and berms along Six Mile Road and Napier Road.
Key data point: No specific factual measurements or regulatory violations stated; this is a technical drawing showing proposed expansion infrastructure and wetland impact areas.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
Arbor Hills Landfill proposes to expand northward across Six Mile Road in Salem Township, Washtenaw County, onto approximately 250 acres owned by the applicant, to provide an additional ~20.6 million cubic yards of disposal capacity after the existing facility exhausts its remaining ~3-year permitted airspace. The expansion will impact 33.29 acres of regulated wetland and 3.90 acres of non-regulated waterbodies, with compensatory mitigation proposed at a project-specific site one mile west in the Rouge River Watershed.
Key data point: Approximately 33.29 acres of regulated wetland impact (26.61 acres of forested wetland, 6.68 acres of emergent wetland) and 3.90 acres of non-regulated ponds/waterbodies; proposed mitigation at 1:1.5 to 2:1 ratios totaling 64.49 acres off-site within the same watershed.
2026-08-20 · Arbor Hills Landfill (Land & Water Interface) · procedural · routine
Arbor Hills Landfill, Inc. filed a pre-application meeting request with EGLE under Part 301 (Inland Lakes and Streams) and Part 303 (Wetlands Protection) for a proposed northward expansion of approximately 250 acres onto property north of the existing facility, with a 92-acre project footprint. The expansion would impact approximately 33.29 acres of regulated wetland, 0.18 acre of non-regulated wetland, 3.90 acres of non-regulated ponds/waterbodies, and one minor stream area. The applicant states the facility receives approximately 2 million cubic yards of waste annually and has only about three years of remaining permitted airspace, making expansion necessary to avoid redirecting waste to more distant facilities.
Key data point: Arbor Hills Landfill expansion project will impact approximately 33.29 acres of regulated wetland; facility receives 2 million cubic yards waste annually and has approximately 3 years of remaining permitted airspace.
2026-08-20 · Emerald RNG · procedural · routine
EGLE Air Quality Division notifies Opal Fuels that its Renewable Operating Permit (ROP) renewal application has completed the 30-day public comment period with no changes made to the draft permit or staff report. The mandatory 45-day USEPA review period began August 24, 2026 and will conclude October 8, 2026.
Key data point: No substantive factual readings or violations stated; procedural milestone only—USEPA review period runs August 24 to October 8, 2026.
2026-08-19 · Arbor Hills Landfill (Land & Water Interface) · procedural · notable
Arbor Hills Landfill (AHLF) submits a Joint Permit Application to excavate and fill approximately 3.78 acres of contaminated wetland (Wetland 1) to resolve Violation Notice VN-011821, which documented elevated PFAS levels resulting from AFFF used to extinguish a 2016 fire at an adjacent recycling facility. The project proposes to permanently remove the PFAS source and eliminate a documented groundwater migration pathway to downstream Outfall 001, with off-site compensatory mitigation of 6.49 acres of wetland creation on an adjacent agricultural property in the same watershed.
Key data point: Wetland 1 contains elevated PFAS (confirmed May 2026 sampling); surface water elevation ~6 feet higher than Pond 3, creating groundwater flow pathway beneath railroad tracks into Outfall 001 discharge; 3.78 acres of PEM and PFO wetland proposed for permanent excavation and fill.
2026-08-12 · Arbor Hills Remediation Area · procedural · notable
GFL responded to EGLE's inquiry about potential leachate breakouts observed during a June 2026 air-quality inspection near the north perimeter stormwater ditch. GFL characterized the four observed dark-colored puddles as stormwater discolored by finished compost used for slope seeding, not leachate, and stated it had regraded and added soil to the affected areas.
Key data point: Four dark puddles observed in/near north perimeter stormwater ditch during June 16, 2026 air-quality inspection; GFL attributed them to compost-laden stormwater runoff rather than leachate breakout.
2026-08-11 · Arbor Hills Energy · procedural · routine
Arbor Hills Energy, LLC submitted an Air Quality Test Plan on 2026-08-11 for a stack emission test scheduled to begin 2026-09-09 at the Northville facility (10611 5 Mile Rd). The submission includes inlet fuel sampling and references a prior performance test from August 2025, with a correction notice flagging that emissions reporting during inlet sampling requires a formal stack test form.
Key data point: No specific quantitative air-quality readings are stated in this document; it is a procedural test-plan submittal with a scheduled test start date of 2026-09-09.
2026-08-11 · Arbor Hills Energy · procedural · routine
Arbor Hills Energy, LLC submitted an Air Quality Test Plan to the State of Michigan on August 11, 2026, scheduling a stack test for September 9, 2026. The submission includes facility contact details, test company information (Impact Compliance and Testing), and references an attached Stack Test Protocol dated August 7, 2026, as a corrected submission following a prior version.
Key data point: Stack test scheduled for 09/09/2026 at 10611 5 Mile Rd, Northville, MI; this is a repeat performance test (last test 08/2025).
2026-08-11 · Arbor Hills Energy · procedural · routine
This is a regulatory form documenting air emission monitoring for turbines at a facility. It specifies sulfur dioxide (SO2) measurement methods (ASTM D5504 and D3588) and a permitted limit of 0.5 lb/hr under Michigan Air Pollution Control Rule.
Key data point: No specific measured reading present; document is a regulatory form template/filing showing permitted SO2 limit of 0.5 lb/hr for turbines.
2026-08-11 · Arbor Hills Energy · procedural · routine
This is a regulatory form documenting emission limits for a Solar Turbine (GT4) combustion unit, specifying sulfur dioxide (SO₂) limits under Michigan air pollution control rules and federal regulations. The document records two SO₂ limits: 0.41 lb/hr under Michigan rules and 0.15 lb/mmbtu under 40 CFR Part 60, Subpart KKKK.
Key data point: Solar Turbine (GT4): SO₂ limit 0.41 lb/hr (Michigan APCR); 0.15 lb/mmbtu (40 CFR Part 60, Subpart KKKK).
2026-08-10 · Arbor Hills Energy · procedural · routine
This is a draft Renewable Operating Permit (ROP0000656 v3.0) issued by Michigan EGLE to Arbor Hills Energy, LLC for the Arbor Hills Landfill and associated stationary sources (SRN N1504). The permit governs air emissions from landfill-gas-fired turbines and requires monitoring of hydrogen sulfide, NOx, CO, SO2, and VOC emissions, along with fuel usage tracking and sulfur treatment system maintenance.
Key data point: No specific measured readings stated. Document specifies permitted limits: H2S/TRS concentration not to exceed 20 ppmv (measured as H2S), with initial weekly sampling required for 4 weeks then monthly ongoing.
2026-08-10 · Arbor Hills Energy · procedural · notable
This is a Draft Staff Report for the renewal of Arbor Hills Energy LLC's Renewable Operating Permit (ROP0000656 v3.0), a landfill gas-to-energy facility at the Arbor Hills Landfill. The report documents the technical details, applicable air quality rules, compliance status, and regulatory requirements for the facility, which includes four turbines that generate electricity from landfill gas. The facility has a documented history of violations dating back to 2014, with enforcement actions including a 2021 Consent Decree and a 2022 Consent Judgment requiring compliance improvements, including operation of an adjacent Renewable Natural Gas (RNG) plant by October 2023 to reduce SO2 emissions.
Key data point: Site has received 16 violation notices from December 2014 through April 2025; December 2021 Consent Decree (Civil No. 5:21-cv-12098-SDD-EAS) and March 2022 Consent Judgment (CJ No. 2020-0593-CE) required RNG facility operational by October 31, 2023 to reduce SO2 emissions.
2026-08-10 · Arbor Hills Energy · procedural · routine
Arbor Hills Energy submitted a stack test protocol for September 9, 2026, to verify SO2 emissions from landfill-gas-fired turbines (three EGT-Typhoon units and one Solar Taurus unit) operating under Permit to Install 68-23A V2.0. The test will measure total sulfur content in the treated landfill gas using ASTM methods to demonstrate compliance with SO2 permit limits (0.5 lb/hr for FGTURBINES; 0.41 lb/hr and 0.15 lb/MMBtu for EUTURBINE4).
Key data point: No measured emissions data provided; this is a prospective protocol document. Permit limits: FGTURBINES 0.5 lb/hr SO2; EUTURBINE4 0.41 lb/hr and 0.15 lb/MMBtu SO2.
2026-08-10 · Arbor Hills Energy · procedural · routine
Arbor Hills Energy submitted an updated Landfill Gas Treatment System Malfunction Abatement Plan to Michigan EGLE in June 2025, outlining equipment functions, monitoring protocols, and maintenance procedures for the landfill-gas-to-energy facility. The plan describes compression, heat exchange, and filtration systems designed to process up to 8,848 scfm of landfill gas for combustion turbines, with specific trigger thresholds for equipment maintenance (e.g., heat exchanger differential temperature <100°F, coalescing filter pressure >30 psig).
Key data point: No specific measured readings or violations reported. Document is a procedural/operational plan update with equipment-design parameters (8,848 scfm capacity, 260 psi compression target, 20°F above dew point reheating) and maintenance thresholds only.
2026-08-10 · Arbor Hills Energy · procedural · routine
Arbor Hills Energy, LLC submitted an Air Quality Test Plan on 8/10/2026 for a performance test scheduled to begin 9/9/2026 at their Northville facility (SRN N1504). The test is a repeat performance following a previous test in August 2025 and includes stack testing under permits ROP0000656 and 68-23A v2.0.
Key data point: Performance test scheduled 9/9/2026; prior test 8/2025; facility SRN N1504, 10611 5 Mile Rd, Northville, MI.
2026-08-07 · Arbor Hills Remediation Area · procedural · routine
Arbor Hills Landfill submitted its July 2026 Discharge Monitoring Report (DMR) for permit MI0045713 v6.0, covering the treatment pond discharge (001A) for the period 7/1/2026–7/31/2026. The report shows "No Discharge: Y" for all monitoring sets, indicating no measurable effluent during the month. The report was certified by Addam Claes on August 7, 2026, and includes permit limits for suspended solids, CBOD5, ammonia nitrogen, phosphorus, cyanide, mercury, PFOS/PFBS/PFOA, temperature, pH, and dissolved oxygen.
Key data point: No discharge reported for July 2026; all daily and weekly monitoring data fields are blank ("No Discharge: Y" marked for all four monitoring sets).
2026-08-07 · Arbor Hills Remediation Area · evidence · notable
This is a NPDES quarterly laboratory analytical report from Trace Analytical Laboratories documenting PFAS analysis of wastewater samples collected from Outfall 001A at Arbor Hills Landfill on April 10, 2026. The samples included a grab sample, field duplicate, field blank, and trip blank, all analyzed via EPA Method 537M for per- and polyfluoroalkyl substances. Multiple PFAS compounds were detected in the grab and duplicate samples at low nanogram-per-liter concentrations.
Key data point: PFBA 45 ng/L, PFPeA 26 ng/L, PFHxA 23 ng/L detected in Outfall 001A wastewater, April 10, 2026—evidence of PFAS presence in landfill discharge.
2026-08-07 · Arbor Hills Remediation Area · evidence · notable
Arbor Hills Remediation Area submitted a PFAS monitoring report for treated wastewater effluent (Outfall 001A) sampled on April 10, 2026, under NPDES permit MI0045713. The report includes laboratory results for 28 required PFAS analytes and additional compounds, with most results at or below detection limits, but several detected compounds including PFBA (45 ng/L), PFPeA (26 ng/L), PFHxA (23 ng/L), and PFOA (4.7 ng/L).
Key data point: PFBA 45 ng/L, PFPeA 26 ng/L, PFHxA 23 ng/L in treated wastewater effluent Outfall 001A, sampled 2026-04-10
2026-08-07 · Arbor Hills Landfill · evidence · urgent
An email from EGLE documenting a subsurface oxidation (SSO) event detected at Arbor Hills Landfill. The communication addresses the thermal and combustion risks associated with smoldering waste mass conditions. This represents an active environmental concern requiring monitoring and potential corrective response.
Key data point: Subsurface oxidation event documented by EGLE at Arbor Hills Landfill on 2026-08-07; specific temperature or gas readings not provided in the document excerpt.
2026-08-07 · Arbor Hills Landfill · evidence · urgent
EGLE's email to GFL requests detailed investigation results for a 30-well subsurface oxidation (SSO) event detected in late 2024–early 2025, including root cause, physical changes to the landfill, odor and leachate impacts, remedial measures, CO data, and current status. The attached analyses show wellhead gas-extraction data from May 2026 revealing persistent operational problems: well AHWW32 pulling ambient air (O2 16–19%), well AHW263R5 sustained at 142–144°F despite valve adjustments, well AHWW500R experiencing loss of vacuum, and 13 of 30 wells flagged for low applied vacuum or air-intrusion signatures.
Key data point: Well AHW263R5: 142.6–144.2°F across all four May 2026 visits (measured); well AHWW32: O2 16–19% and CH4 3–8% indicating air short-circuit; 30 wells flagged 'SSO' from Oct 2024–Sept 2025; one measured loss-of-vacuum event at AHWW500R on 2026-05-08 (+0.25 in.H2O).
2026-08-07 · Arbor Hills Landfill · evidence · notable
GFL Environmental's response to EGLE regarding a subsurface oxidation (SSO) event at Arbor Hills Landfill in late 2024–2025. The company clarifies that only three primary locations (wells 328R, 294R, 272R) and one historical area (16R6) experienced suspected SSO conditions, not 30 wells; 26 surrounding wells had vacuum reduced as a precautionary measure. All affected wells have returned to baseline operating parameters after isolation of compromised compressed air lines.
Key data point: Well AHW263R5 measured at 143.8°F (June 2026), well AHW260R3 at 125.3°F (July 2026), well AHWW0279 at 150.5°F (July 2026), well AHW272R4 elevated temperatures February 2025 above normal, well AHW328R elevated downhole temperatures and trace oxygen detected at depth, well AHW294R elevated downhole temperatures detected.
2026-08-07 · Arbor Hills Landfill · procedural · routine
EGLE Air Quality Division conducted a records review of Arbor Hills Landfill (N2688) on August 7, 2026, and determined the facility is in compliance. The review documents a recent subsurface oxidation event at the site but identifies no violations.
Key data point: Recent subsurface oxidation event documented; compliance status affirmed with no findings of non-compliance as of August 7, 2026.
2026-08-07 · Arbor Hills Landfill · procedural · routine
EGLE's Air Quality Division approved Arbor Hills Landfill's protocol for emissions testing of enclosed flares, scheduled to begin September 1, 2026. The testing will measure sulfur dioxide and hydrochloric acid under ROP0000224 v2.2 and federal MACT standards, with results to be submitted via MiEnviro.
Key data point: No specific measured readings. Document approves a test protocol with permitted limits: SO2 2.5 lb/hr, HCl 6.0 lb/hr; testing scheduled September 1, 2026.
2026-08-05 · Arbor Hills Energy · procedural · routine
Opal Fuels submitted a revised semi-annual compliance report for the Arbor Hills landfill RNG facility (Consent Decree reference), correcting typographical errors in date fields. The revision clarifies that an H₂S sample collected on 6/16/2026 preceded a partial RNG plant shutdown, and notes that a downstream process disturbance did not affect sampling or STS (Sampling and Testing System) operation.
Key data point: No specific quantitative readings or violations reported in the email cover letter. The full 31-page report attachment is not provided in the text.
2026-08-05 · Arbor Hills Energy · procedural · routine
EGLE air-quality inspector Diane Kavanaugh Vetort conducted a Title V compliance inspection on June 16, 2026 of the Arbor Hills stationary source (including N2688 Arbor Hills Landfill, P1488 Emerald RNG, and N1504 Arbor Hills Energy). The inspector requested permit-required records from the AHE plant covering June 2025 through May 2026, including testing, sampling, and monitoring documentation for three permit-defined systems (EUTURBINE4, FGTURBINES, FGPROJECT23).
Key data point: EGLE conducted Title V compliance inspection on June 16, 2026; records due June 26, 2026 for AHE plant covering H2S/TRS sampling, turbine testing, and monitoring for June 2025–May 2026.
2026-08-04 · Arbor Hills Energy · procedural · routine
EGLE Air Quality Division is renewing Arbor Hills Energy's Title V Renewable Operating Permit (ROP0000656 v3.0) for the landfill facility at 10611 5 Mile Road, Northville, Michigan. The renewal proposes no emissions change and is open for public comment until September 9, 2026, with an option to request a public hearing.
Key data point: Public comment deadline September 9, 2026 for Title V ROP renewal (ROP0000656 v3.0); no emissions change proposed.
2026-08-04 · Arbor Hills Energy · procedural · routine
EGLE's Air Quality Division notifies Arbor Hills Energy of a mandatory 30-day public comment period (August 10 – September 9, 2026) for renewal of its Renewable Operating Permit (ROP). A public hearing may be held if sufficient public interest is shown or requested. The ROP will be approved and issued after resolution of comments, any public hearing, and a 45-day EPA review period.
Key data point: 30-day public comment period for ROP renewal: August 10, 2026 to September 9, 2026.
2026-08-04 · Arbor Hills Landfill · procedural · routine
Arbor Hills Landfill submitted an air quality test plan on August 4, 2026, to measure total reduced sulfur (SO2) and hydrogen chloride (HCl) concentrations from enclosed flares per permit requirements. The state regulator (Jeremy Howe, EGLE) issued a correction request on the same day requesting resubmission using the stack test form to properly document pollutants and limits.
Key data point: No specific factual measurements or readings are present in this document; it is a procedural submission requesting air testing to begin 09/01/2026.
2026-08-04 · Arbor Hills Landfill · procedural · routine
This nForm document filed on August 4, 2026, lists permitted emission limits for enclosed flare units at a municipal solid waste landfill under 40 CFR Part 63 Subpart AAAA. The form specifies limits for sulfur dioxide (2.5 lb/hr) and hydrochloric acid (6.0 lb/hr) using methods D5504 and TO-15.
Key data point: Permitted emission limits: sulfur dioxide 2.5 lb/hr and hydrochloric acid 6.0 lb/hr from enclosed flares at MSW landfill.
2026-08-04 · Arbor Hills Landfill · procedural · routine
GFL Environmental submitted an Air Quality Test Plan (version 1.12) for Arbor Hills Landfill on August 4, 2026, proposing stack testing beginning September 1, 2026. The submission was flagged for correction by EGLE, requesting resubmission as a formal stack test form to include pollutants and limits. An attached test plan addresses hydrogen sulfide (H2S) and hydrochloric acid (HCl) sampling.
Key data point: Test plan submitted 8/4/2026 for H2S and HCl stack testing beginning 09/01/2026; EGLE correction notice issued same day requesting proper stack test form and pollutant limit specification.