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9.0 EIR Subject Areas Requiring No Change in Analysis <br />Avion Project SEIR <br />Page 9-2 <br />consistency could not be analyzed in detail for the perimeter properties, and impacts were assumed <br />to be potentially significant. An analysis of the project’s impacts relative to these land use issues is <br />presented in Sections 5.1.3, and 5.1.4 of this SEIR. <br />9.2 Traffic/Circulation <br />The 1998 EIR included a traffic and circulation analysis for buildout of the entire Subarea Plan. The <br />1998 EIR identified numerous significant direct and cumulative impacts to the surrounding roadway <br />network in conjunction with buildout of the Subarea Plan. Mitigation for buildout of the Subarea <br />Plan resulted in the development of a Transportation Phasing Plan, which requires facilities be in <br />place based on the total number of Equivalent Dwelling Units (1 Equivalent Dwelling Unit = 1 single- <br />family dwelling or 10 Average Daily Traffic) constructed within the Subarea. The Transportation <br />Phasing Plan is funded through payment of Public Facilities Financing Plan (PFFP) fees at the time of <br />building permit issuance, with facilities constructed per the requirements of the Transportation <br />Phasing Plan. <br />The project is consistent with the designated land use and density assumptions for Southeast <br />Perimeter Parcel C. Additionally, a traffic impact memorandum prepared for the project <br />demonstrated how the proposed 84 detached multi-family units would be consistent with the <br />Subarea Plan and the traffic analysis presented in the 1998 EIR (KOA 2019; Appendix F). Therefore, <br />the project would be subject to conditions of approval consistent with the Mitigation Monitoring and <br />Report Program (MMRP) for the 1998 EIR. Specifically, prior to the issuance of any building permit, <br />the project would be required to be in conformance with the Black Mountain Ranch Transportation <br />Phasing Plan. The project would not result in any new significant or substantially increased adverse <br />impacts beyond those previously identified in the EIR. <br />9.3 Hydrology and Water Quality <br />9.3.1 Hydrology/Drainage <br />The 1998 EIR did not identify any significant impacts to natural drainage patterns; however, the EIR <br />concluded that buildout of the Subarea would result in an increase in runoff due to the creation of <br />new impervious surfaces. Runoff could result in adverse impacts to the drainage to the west, but <br />impacts could be mitigated through proper design of future development. The MMRP for the <br />1998 EIR specified that detailed drainage design and best management practices (BMPs) would be <br />conditions for any subsequent tentative maps for development within the Southeast Perimeter <br />properties. Consistent with the MMRP, the project prepared a site-specific Preliminary Drainage <br />Report (PDC 2019b) and Storm Water Quality Management Plan (SWQMP) (PDC 2019c). There are <br />minimal drainage facilities on the project site in the existing condition, and stormwater on-site <br />currently sheet flows into natural channels. Additionally, approximately two acres off-site to the east <br />drains northwest through the project site towards the natural channel located on the east side of <br />the project. <br />The post-project drainage pattern has been designed to be generally consistent with the existing <br />drainage pattern on-site and would not alter the destination of downstream flows. The project