Exclusion(s): Establishments primarily engaged in:

*producing crude oil from surface shales or tar sands or from reservoirs in which the hydrocarbons are semisolids and conventional production methods are not possible (211114, Non-Conventional Oil Extraction); *performing oil field services for operators, on a contract or fee basis (213118, Services to Oil and Gas Extraction); and *recovering liquefied petroleum gases incidental to petroleum refining (324110, Petroleum Refineries).

Exclusion(s): Establishments primarily engaged in:

*the exploration for, and/or production of, petroleum or natural gas from wells in which the hydrocarbons will initially flow or can be produced using normal pumping techniques (211113, Conventional Oil and Gas Extraction); *performing oil field services for operators, on a contract or fee basis (213118, Services to Oil and Gas Extraction); and *recovering liquefied petroleum gases incidental to petroleum refining (324110, Petroleum Refineries).