The Larke Reservoir is a very beautiful water reservoir area that is off limits to the general public. The project consisted of engineering, drilling, and grouting an earth dam which was leaking at a rate of 8.7 gallons per minute. The grouting portion of the project took six weeks and 1600 gallons of chemical grout to complete, while the planning-engineering phase took much longer. 

The Procedure:

After the grout holes were drilled to a predetemrined depth and casings installed, expandable packers were lowered into the casings and inflated to seal the hole.  Water and then finally hydroactive chemical grout was injected.  The grout was allowed to begin curing after which the pressure was released on the packer and it was removed from the hole.  The grout then activates tightly filling fissures and other voids underground.  This process is repeated at specified spacing to form an underground barrier or grout curtain if you will.

This photo was taken from atop the dam.	This photo shows the view from the entry side of the dam and across the top of the earth dam.
Drilling the grout holes to their predetermined depths in preparation for grouting.	Chemical Hydroactive Grout used to seal the leaks in the dam.
Chemical go into this machine's vat and are mixed before dropping into a pneumatic pump for injection.	Inserting a packer into a grout hole.  A packer is a device attached to the end of the grout hose which is used to seal the grouthole in order to keep the expanding grout from exiting up through the top of the grout hole.
A technician extracting a packer assmbly from a grout hole after pumping and a short time to allow the grout to begin activating so the grout won't come back out the hole when the packer is removed.	These bubbles were spotted several yards from the bank just after grouting, they are caused by underground void displacement by the grout.