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- ~ . c. Historic preservation and archaeological activities, provided that they comply with the following: 1. The land disturbance undergoes an administrative reVIew, pursuant to Section 9.1-1 O( c), prior to approval; and 2. Any land disturbance exceeding an area of 2,500 square feet shall comply with chapter 11 (erosion and sediment control) of this Code. (3) Buffer area requirements. To mIllImIze the adverse effects of human activities on the other components of resource protection areas, state waters, and aquatic life, a 100-foot buffer area of vegetation that is effective in retarding runoff, preventing erosion, and filtering nonpoint source pollution from runoff shall be retained if present and established where it does not exist. The buffer area shall be located adjacent to and landward of other RP A components and along both sides of any water bodies with perennial flow. The full buffer area shall be designated as the landward component of the RP A, in accordance with sections 9.1-4 and 9.1-11. Notwithstanding permitted uses, encroachments, and vegetation clearing as set forth in this section, the 100-foot wide buffer area is not reduced in width. The 100- foot buffer area shall be deemed to achieve a 75 percent reduction of sediments and a 40 percent reduction of nutrients. (4) Permitted encroachments into the buffer area. a. When the application of the buffer area would result in the loss of a buildable area on a lot or parcel recorded prior to October 1, 1989, the director of planning, after consulting with the city engineer, may allow encroachments into the buffer in accordance with the following criteria: 1. Encroachments into the buffer areas shall be the minimum necessary to achieve a reasonable buildable area for a principal structure and necessary utilities; 2. Where practicable, a vegetated area equal to the area of encroachment into the buffer area shall be established elsewhere on the lot or parcel; and 3. The encroachment may not exceed into the seaward 50 feet of the buffer area. b. When the application of the buffer area would result in the loss of a buildable area on a lot or parcel recorded between October 1, 1989, and March 1, 2002, encroachments may be allowed through the exception process described in section 9 .1-12( c) in accordance with the following criteria: