§ 49.152 Definitions.

(a) For sources of regulated NSR pollutants in nonattainment areas, the definitions in § 49.167 apply to the extent that they are used in this program (except for terms defined in paragraph (d) of this section).

(b) For sources of regulated NSR pollutants in attainment or unclassifiable areas, the definitions in § 52.21 of this chapter apply to the extent that they are used in this program (except for terms defined in paragraph (d) of this section).

(c) For sources of HAP, the definitions in § 63.2 of this chapter apply to the extent that they are used in this program (except for terms defined in paragraph (d) of this section).

(d) The following definitions also apply to this program:

Affected emissions units means the following emissions units, as applicable:

(1) For a proposed new minor source, all the emissions units.

(2) For a proposed modification, the new, modified and replacement emissions units involved in the modification.

Allowable emissions means “allowable emissions” as defined in § 52.21(b)(16) of this chapter, except that the allowable emissions for any emissions unit are calculated considering any emission limitations that are enforceable as a practical matter on the emissions unit's potential to emit.

Begin construction means, in general, initiation of physical on-site construction activities on an emissions unit which are of a permanent nature. Such activities include, but are not limited to, installation of building supports and foundations, laying underground pipework and construction of permanent storage structures. With respect to a change in method of operations, this term refers to those on-site activities other than preparatory activities which mark the initiation of the change. The following preparatory activities are excluded: Engineering and design planning, geotechnical investigation (surface and subsurface explorations), clearing, grading, surveying, ordering of equipment and materials, storing of equipment or setting up temporary trailers to house construction management or staff and contractor personnel.

Commence construction means, as applied to a new minor stationary source or minor modification at an existing stationary source subject to this subpart, that the owner or operator has all necessary preconstruction approvals or permits and either has: