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Stormwater runoff would be collected and conveyed through bio- retention basins <br />located on the north side of the extended Lynn Drive, and on the south side of Rose <br />Avenue. Stormwater would be conveyed through underground piping to a proposed <br />energy dissipater outfall into the arroyo. Staff finds the proposal is acceptable. <br />Sewer Infrastructure <br />Wastewater from existing development in the area flows east towards a sanitary sewer <br />main near Fair Street. To avoid the need for a pump station to move wastewater from <br />the project site to the existing Fair Street main, the applicant would install a new <br />sanitary sewer line from the project site through the Fairgrounds, to existing lines on <br />Valley Avenue. Because this new line would also carry wastewater from other <br />residential areas in the vicinity of the project site, pro -rata contributions for the <br />infrastructure have already been collected and would be used for construction of the <br />new infrastructure. <br />Geotechnical and Creek Bank Stability Analysis <br />The northerly portion of property lies within the Arroyo Del Valle channel bottom and <br />embankment. A geotechnical engineering consulting group analyzed the slope stability <br />of the creek bank and geotechnical hazards of the project site. The consultant <br />concluded that the project site is suitable for the proposed development and provided <br />recommendations and guidelines for the foundation and retaining wall designs. <br />Staff has reviewed the report and found it is acceptable; however, staff requests that <br />additional testing to be performed in the proposed bio- retention area located between <br />the arroyo and the proposed Lynn Drive to determine the existence of any soil that <br />could compromise the integrity of the bio- retention area and the slope bank. Staff has <br />included a condtiion of approval to address this item. <br />Arborist Report and the Proposed Landscape Plan <br />An arborist report was prepared by HortScience. It surveyed a total of 239 trees, <br />representing 13 species within the development area. The report stated that 13 trees <br />are dead; 182 trees are in poor condition; 39 trees are in fair condition; and five are in <br />good condition. Of the 239 surveyed trees, 138 trees are heritage -sized trees. The <br />report recommends preservation of 16 trees (12 of which are heritage -sized trees) and <br />removal of 223 trees (126 of which are heritage -sized trees). <br />The 2005 -2025 General Plan states the following regarding tree removal: <br />Policy 2: Preserve heritage trees throughout the Planning Area. <br />Program 2.1: Strongly encourage preservation of heritage trees; where <br />preservation is not feasible, the City will require tree replacement <br />or a contribution to the Urban Forestry Fund. Allow no net loss of <br />trees. <br />PUD -99 Planning Commission <br />9 <br />