12/08/2021 P&Z Packet - Laserfiche WebLink

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with the recorded water table of 881.90 (the infiltration area), an infiltration basin with a bottom of 888.50 was designed. The bottom of the basin is chosen so it can achieve the sufficient 3-foot separation from the water table. The proposed stormwater management facility has been reviewed by the City Engineer and RCWD for compliance for water quality treatment and runoff control. These requirements are met with only a few minor revisions required to the civil plans. Public Utilities The new commercial office building will be municipally served by a 10" PVC sanitary sewer and a 16" DIP watermain located along Blue Heron Drive. Tree Preservation and Mitigation Standards Per the November 30, 2021 Environmental Staff Report: The purpose of these standards is to protect valuable trees and stands of vegetation while not interfering with landowners' reasonable use and development of property. The goal is to minimize unnecessary loss of habitat, biodiversity, and forest resources and to replace removed trees in areas where tree cover is most critical. The plan calls for removals of 59 trees, 58 of which will not require mitigation because they are in the Basic Use Area and not in an Environmentally Sensitive Area. One tree is in a Natural Resource Conservation Area and will require 2 mitigation trees to be planted. Preservation and mitigation standards have not been met. Open Areas Landscape Standards The purpose of these standards is to provide general site beautification and high aesthetic quality with a mix of plant materials in open areas. Open area landscape standards call for 1 large tree and 3 large shrubs per 2000 sq. ft. The following substitutions are allowable: 1 large tree = 1.5 medium or 2 small trees 1 large shrub = 1.5 medium or 3 small shrubs 27,250 sq.ft. of open space calls for: 14 large trees and 42 large shrubs Provided: 14 large tree equivalents and 0 large shrubs There are 5 existing trees (cottonwoods) that will be credited as 11 large trees. Existing trees are credited at the following rates: 7