Section 60.670 - Applicability and designation of affected facility(a)(1) Except as provided in paragraphs (a)(2), (b), (c), and (d) of this section, the provisions of this subpart are applicable to the following affected facilities in fixed or portable nonmetallic mineral processing plants: each crusher, grinding mill, screening operation, bucket elevator, belt conveyor, bagging operation, storage bin, enclosed truck or railcar loading station. Also, crushers and grinding mills at hot mix asphalt facilities that reduce the size of nonmetallic minerals embedded in recycled asphalt pavement and subsequent affected facilities up to, but not including, the first storage silo or bin are subject to the provisions of this subpart.(2) The provisions of this subpart do not apply to the following operations: All facilities located in underground mines; plants without crushers or grinding mills above ground; and wet material processing operations (as defined in § 60.671 ).(b) An affected facility that is subject to the provisions of subparts F or I of this part or that follows in the plant process any facility subject to the provisions of subparts F or I of this part is not subject to the provisions of this subpart.(c) Facilities at the following plants are not subject to the provisions of this subpart: (1) Fixed sand and gravel plants and crushed stone plants with capacities, as defined in § 60.671 , of 23 megagrams per hour (25 tons per hour) or less;(2) Portable sand and gravel plants and crushed stone plants with capacities, as defined in § 60.671 , of 136 megagrams per hour (150 tons per hour) or less; and(3) Common clay plants and pumice plants with capacities, as defined in § 60.671 , of 9 megagrams per hour (10 tons per hour) or less.(d)(1) When an existing facility is replaced by a piece of equipment of equal or smaller size, as defined in § 60.671 , having the same function as the existing facility, and there is no increase in the amount of emissions, the new facility is exempt from the provisions of §§ 60.672 , 60.674 , and 60.675 except as provided for in paragraph (d)(3) of this section.(2) An owner or operator complying with paragraph (d)(1) of this section shall submit the information required in § 60.676(a) .(3) An owner or operator replacing all existing facilities in a production line with new facilities does not qualify for the exemption described in paragraph (d)(1) of this section and must comply with the provisions of §§ 60.672 , 60.674 and 60.675 .(e) An affected facility under paragraph (a) of this section that commences construction, modification, or reconstruction after August 31, 1983, is subject to the requirements of this part.(f) Table 1 of this subpart specifies the provisions of subpart A of this part 60 that do not apply to owners and operators of affected facilities subject to this subpart or that apply with certain exceptions.