Ordinance 1838-91 - Laserfiche WebLink

4 . Category IV Wetlands (Ordinary Resource Value) . "Category IV Wetlands" means wetlands that are hydrologically isolated; have an area less than or equal to one acre; contain one vegetation class, 80 percent of which is dominated by one or more of the species listed below: Common Name Scientific Name Small-fruited bulrush Scirpus microcarpus Hard hack spirea Spirea douglasii Purple loosestrife Lythrum salicaria Townsend's cordgrass Spartina townsendii Canada thistle Cirsium arvense Himalayan blackberry Rubus discolor Reed canary grass Phalaris arundinacea Velvet grass Holcus lanatus Foxtail Alopecurus pratensis Soft rush Juncus effusus Reed Phragmites communis Orchard grass Dactylis glomerata Buttercup Ranunculus repens Colonial Bent Grass Agrostis tenuis Redtop Agrostis alba Section 10: Standard Wetland Buffer Width Requirements. A. Standard Buffer Width. The following minimum buffers of native vegetation shall apply to wetlands based upon the wetland category. Buffers shall be measured from the wetland boundary delineated as required by Paragraph A of Section 9 of this Ordinance. If the designated buffer contains significant vegetation with driplines extending beyond the edge of the buffer, the buffer shall be extended to five (5) feet beyond the outside edge of the dripline. For purposes of this Section, "significant vegetation" means a healthy evergreen tree, 10 inches in diameter or greater, measured 4 .5 feet above existing grade. 1 . Category I 100 feet 2. Category II 75 feet 3 . Category III 50 feet 4. Category IV 25 feet B. Required Fencing, Signs. 1 . A temporary construction fence shall be placed along the construction setback line to prevent encroachment during construction. The City may require any development proposed on a lot which contains or adjoins a wetland to provide a fence or other structural protection at the edge of the wetland buffer to minimize encroachment into and disturbance of the wetland and buffer area after construction. 13