R 336.1114 Definitions; N.

Rule 114. As used in these rules: (a) "Natural finish hardwood plywood panel" means a panel that has its original grain pattern enhanced by essentially transparent finishes frequently supplemented by fillers and toners. (b) "Natural gas processing plant" means a stationary source where the extraction of natural gas liquids from field gas or the fractionation of the liquids into natural gas products, such as ethane, propane, butane, and natural gasoline, takes place. (c) "Natural gas process unit" means process equipment assembled for the extraction of natural gas liquids from field gas, the fractionation of the liquids into natural gas products, or other operations associated with the processing of natural gas products. A natural gas process unit may operate independently if supplied with sufficient feed or raw materials and sufficient storage facilities for the products. (d) "Nearby" means, with respect to good engineering practice design stack heights, a distance of up to 5 times the lesser of the height or the width dimension of a structure, but not more than 0.8 kilometers (0.5 miles). The height of the structure is measured from the ground level elevation at the base of the stack. (e) "Nonattainment area" means an area designated as not having attained full compliance with any national ambient air quality standard pursuant to section 107(d) of the clean air act. Such designation shall be air contaminant specific and shall not mean that an area is a nonattainment area for any other air contaminant unless so specified. The department shall maintain a list of designated nonattainment areas and shall update the list when air quality monitoring or modeling data warrant. For certain air contaminants, nonattainment areas are classified for the purposes of applying an attainment date, or for other purposes, in accordance with procedures established pursuant to the clean air act. For ozone nonattainment areas, classifications are established as follows: (i) Nonclassifiable. (ii) Marginal. (iii) Moderate. (iv) Serious. (v) Severe. (vi) Extreme.