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

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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR CITY OF SANTA ANA 5. Environmental Analysis HYDROLOGY AND WATER QUALITY cumulative projects in conjunction with individual development projects that would be accommodated by the Harbor Corridor Plan are not expected to cause substantial cumulative impacts to storm drainage capacity in the region. Flood Hazard Impacts Cumulative projects would increase the numbers of people and buildings in 100 -year flood zones and in dam inundation zones within the Santa Ana. River Watershed. Flood control improvements along the Santa Ana River would reduce hazards from 100 year floods and from potential dam inundation throughout 100 year flood zones in the Santa Ana River Watershed in Orange County, and throughout the dam inundation zone for Prado Dam. Therefore, the proposed projects flood hazard impacts would not be cumulatively considerable. 5.7.5 Existing Regulations State • General Construction Activity Permit, Order No. 2009- 0009 -DWQ; NPDES No. CAS000002 City of Santa Ana • MS4 NPDES permit • Drainage Area Master Plan Fees 5.7.6 Level of Significance Before Mitigation Upon implementation of regulatory requirements and standard conditions of approval, the following impacts would be less than significant: 5.7 -1, 5.7 -2, and 5.7 -7. Without mitigation, the following impacts would be potentially significant: ■ Impact 5.7 -3 Significant impacts to the storm drain system in the project area could occur as a result of project implementation. ■ Impact 5.7 -4 Construction could result in a short -term increase in pollutant concentrations in runoff. ■ Impact 5.7 -5 Project implementation could result in a change to the quality of stormwater runoff ■ Impact 5.7 -6 Individual projects within the Harbor Corridor Plan may be located within a 100 year flood zone. Page 5.7 -2% PlaceWorkr