On August 10, 2015, the mismanagement of Arbor Hills Landfill led to the contamination of Johnson Creek with “tens of thousands” of gallons of leachate spewing into the water. This information was obtained by a Freedom of Information Act request sent to Washtenaw County that produced the email pictured above and attached.
The email states, in part: “The force main for the leachate collection/treatment system failed. The leachate was discharged to a 2m gallon onsite stormwater retention pond that discharges to the Johnson Creek via a ditch.
“They are trying to determine the volume of leachate released, probably in the neighborhood of tens of thousands. Potentially, the leachate may cause a BOD problem in the Creek.”
We don’t have more details at this time.
Leachate is a landfill waste product created when rainwater flows through decomposing waste and picks up toxic contaminants. The creation of leachate, sometimes called “garbage soup,” presents a major threat to the current and future quality of ground water. A release of leachate to the ground water may present several risks to human health and the environment.
The release of hazardous and nonhazardous components of leachate may render an aquifer unusable for drinking-water purposes and other uses, which is what happened to the aquifer on the corner of 6 Mile and Napier across from the historic school house in Northville Twp.
Leachate impacts to groundwater may also present a danger to the environment and to aquatic species if the leachate-contaminated groundwater plume discharges to wetlands or streams.
The Arbor Hills East (AHE) Landfill does not have a base liner in place but it has a slurry wall.
AHE entered into a consent order in the late 1980s which required remedial activities that included the slurry wall, gradient control, a pump-and-treat groundwater control system, an active gas collection system and final closure. AHE has dual gas and leachate extraction wells in place. Republic Services (BFI) is responsible for all long-term care, environmental compliance and any remedial activities associated with the AHE portion of the landfill.
Advanced Disposal is responsible for Arbor Hills West (AHW) environmental compliance. AHW has a double composite liner system and an active gas extraction system.
The active gas extraction system for both the east and west portions of the landfill are owned, installed and operated by Republic Services.
There are 3 groundwater zones monitored around the landfill – the upper, intermediate and lower zones. The only continuous aquifer beneath the site is the lower zone.