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Chapter 2 CEQA Findings <br />Impact Statement <br />Impact 4.6-4 Future <br />development in the Transit <br />Zoning Code (SD 84) could <br />alter the existing drainage <br />pattern and potentially result <br />in increased downstream <br />flooding through the addition <br />of impervious surfaces, or <br />exceeding the capacity of <br />existing or planned <br />stormwater drainage <br />systems. <br />Level of <br />Significance after <br />Mitigation <br />Less than <br />significant <br />Transit Zoning Code (SD 84) EIR Findings of Fact/Statement of Overriding Considerations 2-33 <br />Evidence/Rationale Supporting Findings <br />not anticipated to substantially alter the <br />drainage patter and future development <br />would adhere to existing requirements <br />which would reduce erosion and siltation <br />during operation, the impact would be <br />reduced to below the level of significance. <br />Future development would consist <br />primarily of infill and redevelopment which <br />would not substantially alter drainage <br />patterns because these areas are already <br />developed with existing uses and <br />impervious surfaces. However, <br />development of land that is currently <br />vacant and covered with permeable <br />surfaces, would increase impervious <br />surfaces and could in turn increase <br />stormwater runoff in the project area. This <br />increase in runoff could exceed capacity <br />of existing and planned infrastructure and <br />cause downstream flooding impacts. <br />However, implementation of MM4.6-1 <br />would reduce the volume of runoff <br />generated and potential for flooding <br />through incorporation of stormwater <br />detention facilities. Mitigation measures <br />MM4.6-2 through MM4.64 would address <br />issues relating to existing storm drain <br />system capacity through project design <br />features, and by providing for project <br />specific requirements. <br />Mitigation Measures <br />MM4.6-2 Prior to issuance of grading permits <br />for future development projects in the Transit <br />Zoning Code (SD 84) area, applicants shall <br />submit site-specific Hydrology and Hydraulic <br />Studies to the Public Works Department for <br />review and approval. If existing facilities are <br />not adequate to handle runoff that may be <br />generated by the proposed development, <br />then the applicant shall propose feasible <br />remedies to assure that adequate drainage <br />facilities will be available prior to issuance of <br />occupancy permits. The applicant may <br />propose storm drain improvements to be <br />constructed in order to meet project needs. If <br />necessary storm drain upgrades cannot be <br />implemented prior to issuance of occupancy <br />permits, on site detention facilities or other <br />methods acceptable to the City shall be <br />included with new development projects to <br />ensure that post-construction runoff does not <br />exceed pre-development quantities. <br />MM4.6-3 During the design of individual <br />projects, applicants shall minimize impervious <br />area by incorporating landscaped areas over <br />substantial portions of a proposed project <br />area. Furthermore, impervious areas shall be <br />directly connected to landscaped areas or <br />bioretention facilities to promote filtration and <br />infiltration of stormwater. <br />Findings <br />Finding 1 <br />The Agency finds that changes or alterations <br />have been required in, or incorporated into, the <br />project which would avoid or substantially <br />lessen the significant environmental effect as <br />identified in the final EIR.