Every residential development shall protect all unmitigated critical areas and associated buffers as permanent open space in the form of separate tracts or Native Growth Protection Areas (NGPAs). (Ord. 1164 § 4, 2004; Ord. 1098 § 2, 2001; Ord. 948, 1996; Ord. 929 Ch. 10(M)(6), 1995. Formerly 17.147.060).