A left shift is a phrase used to note that there are a high number of young, immature white blood cells present. Most commonly, this means that there is an infection or inflammation present and the bone marrow is producing more WBCs and releasing them into the blood before they are fully mature.
the gas line should be at least 30 inches deep. But may vary according to how strict your local safety codes are for preventing homeowners from hitting the line while digging in a tree or fence post. Call a heating/plumbing contractor.
In modern times, the first well drilled intentionally to obtain natural gas was drilled in 1821 in Fredonia, N.Y. It was 27 feet deep, and was drilled by William A. Hart to get a larger flow of gas than was currently seeping out of the ground. For more history, see http://www.naturalgas.org/overview/history.asp.