Id . at 190, 245 S.E.2d at 538.In arguing that the application of estoppel in the present case would not impair the exercise of DEQ's governmental powers, TRK attempts to rely upon County of Wake v. North Carolina Department of Environment & Natural Resources , 155 N.C. App. 225, 573 S.E.2d 572 (2002), disc. review denied , 357 N.C. 62, 579 S.E.2d 387 (2003), and Fike v. Board of Trustees , 53 N.C. App. 78, 279 S.E.2d 910, disc. review denied , 304 N.C. 194, 285 S.E.2d 98 (1981). Both cases, however, are inapposite.