The soil is worked to a depth of two spades, rather than one, and it’s essential to keep the two layers of soil (subsoil and topsoil) separate. In order to do this, the lower half of the trench ...

The process is expected to take several weeks and will require 6,000 cubic yards of soil, enough to cover three-quarters of an American football field in about 2.5 feet of soil. Then, coastal sage ...