When we talk about a frac-out, it’s easy to think of it as a one-time event. The spill happens and (hopefully) gets cleaned up.
But on Sept. 17, Ron Turney of the Indigenous Environmental Network captured footage that shows much more going on beneath the surface. Near Camp Firelight seven miles from the Mississippi Headwaters, there is evidence of frac-out damage not previously seen, now that Enbridge has removed it temporary plank road.
A Watch the Line volunteer put together a map showing all the places that Enbridge Line 3 has had frac-outs. Enbridge is drilling under 21 waters and wetlands using a technique called horizontal directional drilling. The process requires drilling mud to lubricate and cool the drill. The process happens under pressure and the drilling mud can get forced into cracks in the subsurface soils and get pushed to the surface, showing up in on land or in waterways.
Enbridge’s controversial plans to increase dewatering during Line 3 construction got an added complication: Workers need to dewater in areas where the company had past crude oil spills, leaving 8,400 gallons in ground for decades.
That means Enbridge has to treat the dewatered polluted water before returning it to the environment.
In a pair of Aug. 9 tweets, the Minnesota Pollution Control Agency (MPCA) shared its summary of the harm caused (so far) by Enbridge as crews drilled beneath our waterways to construct the Line 3 tar sands oil pipeline. Below, we offer some context for these numbers, and why Minnesotans should be alarmed.
As we’ve previously written, of the more than 200 waterways that Line 3 will have to cross through northern Minnesota, Enbridge will be tunneling underneath 21 of them using a process called Horizontal Directional Drilling (HDD).
As there has already been one documented frac-out at the Willow River HDD crossing (July 6), it is critical that we keep our eyes on these locations. Below, we have compiled some resources–including a new training video–to prepare volunteers for monitoring HDD locations.
Enbridge Line 3 construction is damaging wetlands. The proposed route is crossing 78 miles of wetlands, or one fifth of its entire route. Workers often install temporary plank roads in and around wetlands to support heavy equipment.
Line 3 is crossing different types of wetlands: emergent, unconsolidated bottom, scrub-shrub, and forested wetland, Enbridge says. One challenge in trenching a pipeline through a wetland is that pipelines can float. Workers have to put weights on them to get them to sink and stay down.
When you are monitoring Line 3 construction, you might see some large black bags near construction sites. These are bags filled with local aggregate to sink the pipeline in place. The industry term is “buoyancy control.”
In water saturated wetlands, one crossing method is called the “push-pull.” Workers excavate a trench working from the plank road, float the assembled pipeline, put weights on it, then push and pull it to get it to sink.
Horizontal Directional Drilling also is used to cross wetlands. Click here for Enbridge’s summary of wetland crossing methods.
Line 3’s approved routecrosses approximately 41 miles of public/municipal land in Cass, Crow Wing, and Aitkin counties, according to the state’s Environmental Impact Statement (EIS). Most of this land is state forest land administered by Minnesota Department of Natural Resources (DNR). More than 10 percent of Line 3’s route crosses public lands.
In January, Enbridge realized that it had vastly underestimated the amount of water needed for temporary trench dewatering during construction.
Dewatering is necessary when constructing a pipeline through wet areas. Excess water must be drawn out from the trench to protect workers and stabilize the soil. The water is later discharged back into the ecosystem. The appropriation of groundwater for dewatering requires a DNR (Minnesota Department of Natural Resources) permit.