texas natural resource conservation commission page 1 chapter 106 exemptions from permitting rule log number 1999 029b 116 ai the proposes amendments to subchapter a 2 4 6 and 13 general requirements c 101 103 domestic comfort heating cooling d 121 124 analysis testing e 141 150 aggregate pavement f 161 163 animal confinement g 181 183 combustion h 201 203 concrete batch plants i 221 223 229 231 manufacturing j 241 245 food preparation processing k 261 266 l 281 283 291 301 302 feed fiber fertilizer m 311 322 metallurgy n 331 333 mixers blenders packaging o 351 355 oil gas p 371 376 plant operations q 391 396 plastics rubber r 411 419 service industries s 431