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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr/ for the latest information on EPA's New Source Review program.

February 13, 1978 PSD Applicability Determination 1.5

"Commence" construction has been interpreted to refer only to continuous on-site construction (i.e., significant and continuous site preparation work such as major clearing or excavation or placement, assembly, or installation of unique facilities or equipment at the site). A contractual obligation will be considered commencement of construction only if its cancellation would result in a significant loss and if it provides for a continuous program of construction.

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