Unlike the statutory exemptions (¢ 2/080, subd. (b)), which reflect policy decisions of the Legisla- ture, the categorical exemptions identified in the Guidelines represent a determination by the Secre- tary for Resources that particular classes of projects generally do not havea significant effect on the en- vironment. (Guidelines, § 15300; Sunset Sky Ranch Pilots Assn. v. County of Sacramento (2009) 47 Cal. 4th 902, 907 [102 Cal. Rptr. 3d 894, 220 P.3d 905].) Thus, contrary to the County's assertion, a policy of encouraging urban in-fill does not over- comethe requirements of CEQA and does not ex- pand the exemption to projects that clearly lie out- side the legal criteria.