(2) Access from a public street to a development site shall be located in accordance with EC 7.420 Access Connections — <br />Location. If a development will increase the development site's peak hour trip generation by less than 50% and will generate <br />less than 20 additional peak hour trips, the development site's existing access connections are exempt from this standard. <br />Response: The proposed subdivision of the subject property will create five (5) new Low -Density single -unit residential lots. No <br />housing is proposed at this time. Per Institute of Transportation Engineers (ITE) Manual 11th Edition, one single -unit lot creates about <br />one (1) peak trip hour of traffic. Therefore, the proposal can be expected to add five (5) additional peak hour trips. The Riverstone <br />Park Subdivision proposal is exempt from the access connection standards in EC 7.420 in compliance with EC 9.6735(2). <br />(e) EC 9.6750 Special Setback Standards. <br />Response: No special setback standards are requested or required with this proposed tentative subdivision plan. <br />(0 EC 9.6775 Underground Utilities. <br />Response: All new utilities within the proposed subdivision will be located underground. The existing overhead lines in the Bushnell <br />Ln ROW will remain. Natural gas, communications, and power are proposed to be joint trenched within the Proposed 25' Access <br />and Utility Easement. Final utility design will be completed during the building permit process by franchise utility providers. Existing <br />overhead utility lines to be relocated to not encumber the buildable area of the proposed lots. Details for relocating these lines will <br />be completed during the building permit process in consultation with the appropriate franchise utility providers. Current utility <br />routings shown are preliminary. See A & 0 Engineering Wastewater and Utilities Sheet C — 2.0. <br />(g) EC 9.6780 Vision Clearance Area. <br />Response: The proposed Riverstone Subdivision contains no corner lots; the criteria related to vision clearance is not applicable to <br />this proposal. <br />(h) EC 9.6791 through 9.6797 regarding stormwater flood control, quality, flow control for headwaters area, oil <br />control, source control, easements, and operation and maintenance. <br />9.6791 Stormwater— Flood Control. <br />(3) Standards. <br />(a) Stormwater flood control facilities shall be designed and constructed according to adopted plans and <br />policies, and in accordance with standards in EC Chapters 6 and 7, and the stormwater flood control provisions <br />and the facility design requirements set forth in the Stormwater Management Manual. <br />Response: The following addresses specific stormwater flood control provisions and facility design as required by the City of <br />Eugene Stormwater Management Manual. <br />Existing Conditions <br />Infiltration testing was done by A&O Engineering on April 18th, 2023. Multiple trials were performed at two different locations <br />located in the north half and south half of the site. Malabon silty clay loam, Malabon-Urban land complex, and Salem -Urban land <br />complex are the on -site soils per USDA Web Soil Survey. <br />Infiltration testing was performed using the encased falling head test method from the City of Eugene Stormwater Management <br />Manual (2014) and is summarized on page 1 of the attached A & 0 Engineering Stormwater Memorandum, Table 1— Infiltration <br />Testing Results. <br />Although 5.33 in/ hour was the lowest measured infiltration rate found through testing, the design infiltration rate will be 2.67 in/hour <br />with a factor of safety of 2 applied. Groundwater was encountered at a depth of 5-6 ft below grade. The existing conditions were not <br />modeled for this project because the storm system is not proposed to discharge into the public system. Infiltration storm planters <br />are modeled to treat and infiltrate all stormwater runoff from impervious surfaces on -site through a 10-year storm event. <br />14 <br />