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U.S. Office of Surface Mining
Reclamation and Enforcement
 Mid-Continent Region

Hidden Lake
Hidden Lake at 3.4 acres, is the deepest and largest of the three lakes in volume 9,670,599 gallons.  An acid seep passes beneath a county road continually supplying acid to the lake.

(Enlarge plan - Acrobat® Reader format)
Backhoe Digging A tracked backhoe was used to excavate 25 feet to the ground water pathway.  Two trenches were excavated, straddling the road.
Backhoe digs trench Digging trench
Truck

Large rock rip-rap was added to each trench.
Truck dumping rip-rap
Placing Tanker Trench 75 tons of Code H, a commercial alkaline product, was pumped from pneumatic tanker trucks into each trench. 
Placing Code H product

Tanker dumping
alkaline product

Trench holding Code H

  
Backhoe Rip-Rap Each trench was topped off with large rock rip-rap to allow for the addition of acetylene waste slurry from Airgas.
Backhoe filling trench Rip-Rap covering trench

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 Last modified: October 02, 2008