Conco Pumping was called when Vance Corporation’s usual pump supplier declined the project declaring the low slump, low cement, high fly flash 1-1/2” aggregate mix unpumpable.

The foundation for the Crafton Hills Reservoir Enlargement was not suitable and after drilling and grouting Primary, Secondary, Tertiary and in some cases Quaternary pile curtains, it was decided that the top 10’ of the foundation needed some other means of sealing. We used a Vermeer Rock Wheel to cut a 2’ wide x 10’ deep Cut-Off Wall which had to be continuously poured with around 900 yards of the low cement content mix so it would not cure too fast and develop any shrinkage cracks. The Abutments on either end rose up to 90’ on a 1:1 slope.