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328 (1) Primary conservation areas; <br />329 (2) Public river corridor views; <br />330 (3) Buildable area; <br />331 (4) Existing and proposed topography and drainage patterns; <br />332 (5) Proposed storm water and erosion and sediment control practices; <br />333 (6) Existing and proposed vegetation to be removed and established; <br />334 (7) Ordinary high water level, blufflines, and all required setbacks; <br />335 (8) Existing and proposed structures; <br />336 (9) Existing and proposed impervious surfaces; and <br />337 (10) Existing and proposed subsurface sewage treatment systems. <br />338 7. Nonconformities. <br />339 a. All legally established nonconformities as of the date of this ordinance may continue consistent <br />340 with 462.357 Subd. le . <br />341 b. New structures erected in conformance with the setback averaging provisions of Section 117- <br />342 148(f)3d (Structure and impervious surface placement) are conforming structures. <br />343 c. Site alterations and expansion of site alterations that were legally made prior to the effective <br />344 date of this ordinance are conforming. Site alterations include vegetation, erosion control, storm <br />345 water control measures, and other nonstructural site improvements. <br />346 d. Legally nonconforming principal structures that do not meet the setback requirements of Section <br />347 117-148(f)3 (Structure and impervious surface placement) may be expanded laterally provided <br />348 that: <br />349 (1) The expansion does not extend into the shore or bluff impact zone or further into the <br />350 required setback than the building line of the existing principal structure (See Figure 5); and <br />351 <br />352 <br />353 <br />(2) The expanded structure's scale and bulk is consistent with that of the original structure and <br />existing surrounding development. <br />10 <br />