Ordinance 3676-19 - Laserfiche WebLink

Al. An applicant must submit a critical area study by a qualified professional that documents that the proposed development design/standards will result in a net improvement of the functions of the critical area over that which would be obtained by applying the standard prescriptive measures contained in this chapter.The study must address best available science as it relates to the critical area functions. B . The study must be circulated to appropriate state and federal resource agencies for review and comment opportunity prior to planning director authorization. C;. The development design/standards may include, but are not necessarily limited to, measures prescribed in an approved watershed conservation plan or other similar conservation plan that addresses critical areas protection consistent with this section. D4. The proposed design/standards must not be materially detrimental to the public welfare or injurious to property or improvements in the vicinity and zone in which the subject property is located. 19.37.080 Geologically hazardous areas. A. Designation. e - - _ - - • --- . . -_ . . . -- _ - -- - - - • ' tThe following geologically hazardous areas shall not be altered except as otherwise provided by this chapter: 1. Landslide hazard areas: a. Those areas defined as high and very high/severe risk of landslide hazard in the Dames and Moore Methodology for the Inventory, Classification and Designation of Geologically Hazardous Areas, City of Everett,Washington:July 1, 1991, or as revised through best available science: i. Very high/severe: slopes greater than fifteen percent in the Qtb, Qw, and Qls geologic units; and slopes greater than fifteen percent with uncontrolled fill. ii. High: slopes greater than forty percent in all other geologic units(not Qtb, Qw, and Qls or uncontrolled fill). b. Those areas defined as medium risk of landslide hazard in the Dames and Moore Methodology for Inventory,Classification and Designation of Geologically Hazardous Areas, City of Everett, Washington:July 1, 1991,or as revised through best available science, when combined with springs or seeps, immature vegetation, and/or no vegetation: i. Slopes less than fifteen percent for Qtb, Qw, and Qls geologic units and uncontrolled fill. ii. Slopes of twenty-five percent to forty percent in all other geologic units. c. Any area with all three of the following characteristics: i. Slopes greater than fifteen percent; and ii. Hillsides intersecting geologic contacts with a relatively permeable sediment overlying a relatively impermeable sediment or bedrock; and iii. Springs, groundwater seepage,or saturated soils. d. Any area which has shown movement during the Holocene epoch (from ten thousand years ago to the present) or which is underlain or covered by mass wastage debris of that epoch. e. Any area potentially unstable as a result of rapid stream incision,stream bank erosion or undercutting by wave action. f. Areas of historic failures, including areas of unstable, old and recent landslides or landslide debris within a head scarp, and areas exhibiting geomorphological features indicative of past slope failure, such as hummocky ground, slumps, earthflows, mudflows, etc. _ .....___..........._...._._.....____------....---._....._... _ --._.. ------....._.__...__.....__...._ ___-- -...._..__._......--- Planning Commission Resolution 19-04 Page 25 Critical Areas March 19, 2019