2014-069 - Final Environmental Impact Report No. 2014-01

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Harbor Boulevard Mixed Use Transit Corridor Plan Findings and Facts in Support of Findings and Statement of Overriding Considerations project applicants to minimize impervious areas, aiding infiltration of stormwater. Upon compliance with these measures and the applicable provisions of the Santa Ana Municipal Code, impacts would be less than significant. Mitigation Measures MM 7 -1 Prior to issuance of grading permits for future development projects in the Harbor Corridor Plan, applicants shall submit site - specific hydrology and hydraulic Studies to the Public Works Agency for review and approval. If existing facilities are not adequate to handle runoff generated by the proposed development, then the applicant shall construct storm drain improvements. If necessary storm drain upgrades cannot be implemented prior to issuance of occupancy permits, the applicant shall provide onsite detention facilities, or other methods to ensure that post- construction runoff does not exceed pre - development quantities. MM 7 -2 During the design of individual projects, applicants shall minimize impervious area by incorporating landscaped areas over substantial portions of a proposed project area. Furthermore, impervious areas shall be directly connected to landscaped areas or bioretention facilities to promote filtration and infiltration of stormwater. (2) Potential Impact: During the construction phase of the individual development projects that would be accommodated by the Harbor Corridor Plan, adherence to the General Construction Activity Permit would reduce short -term pollutant concentrations from individual development sites. Finding: 1. The City hereby makes Finding 1 and determines that this impact is less than significant with the incorporation of the proposed mitigation measures. Facts in Support of Finding Grading and construction activities of individual development projects that would be accommodated by the Harbor Corridor Plan could generate oil and grease, trash and debris, pesticides, other organic compounds such as solvents, degreasers, and compounds in coatings. This would result in short -term impacts on stormwater quality. However, project applicants for individual development projects would be required to comply with existing water quality standards and waste discharge requirements during all grading and construction activities. Implementation of Mitigation Measures 7 -3 and 7 -4 require compliance with such requirements, including those of the State Regional Water Quality Control Board and those requiring project applicants to prepare a Storm Water Pollution Prevention Plan ( SWPPP). The SWPPP would specify BMPs that would protect water quality by eliminating and /or minimizing stormwater pollution prior to and during grading and construction. 30 July 2014