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into the buffer. Averaging shall not adversely impact the functions and values of the <br /> stream system. In either case, the adjusted minimum buffer width shall not be less than <br /> fifty percent of the standard buffer width or ten feet, whichever is greater. (Ord. 1838- <br /> 91 § 14, 1991.) <br /> be and the same is hereby amended to read as follows: <br /> Section 14: Standard Stream Buffer Requirements: <br /> A. Standard Buffer Width: It is the goal of this chapter to preserve streams and their <br /> buffers in a natural condition to the maximum extent possible. Buffers shall be <br /> measured from the top of the upper bank or, if that cannot be determined, from the <br /> ordinary high-water mark as surveyed in the field. In braided channels and alluvial <br /> fans, the top of the bank or ordinary high-water mark shall be determined so as to <br /> include the entire stream feature. Except for category IV streams, if the designated <br /> buffer contains significant vegetation with drip lines extending beyond the edge of the <br /> buffer, the buffer shall be extended to five feet beyond the outside edge of the drip <br /> line. For purposes of this section, significant vegetation means a healthy evergreen <br /> tree, ten inches in diameter or greater, measured 4.5 feet above existing grade. Except <br /> as otherwise provided by Section 37.050 of this chapter, the following minimum <br /> buffers of native vegetation shall apply to streams based upon category: <br /> 1. Category I Streams. Category I streams shall have a minimum buffer of one <br /> hundred feet on each side of the stream, except that properties under the <br /> jurisdiction of the shoreline master program which abut category I streams may <br /> have a minimum buffer of less than one hundred feet when shoreline public <br /> access improvements may otherwise be permitted or required during the <br /> shoreline permit review process; or when a water-dependent or water-related <br /> use which requires a lesser buffer standard is approved during the shoreline <br /> permit review process. <br /> 2. Category II Steams. Category II streams shall have a minimum buffer of fifty <br /> feet on each side of the stream. <br /> 3. Category III Streams. Category III streams shall have a minimum buffer of <br /> twenty-five feet. <br /> 4. Category IV Streams. Category-IV streams shall have a minimum buffer of ten <br /> feet. <br /> 9 <br />