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 The Drainage Engineering Report prepared in 1993 by Boyle Engineering has shown that the existing drainage system is deficient and unable to convey the current runoffs. Table 5.7 -4 reveals the pipe capacities and deficiencies if the recommendations of the Drainage Engineering Report were implemented and the existing flows were increased by 15 percent to account for the implementation of the proposed project. As shown in the table, after completion of specified drainage improvements, no drainage deficiencies would remain, with the exception of the pipe segment from 0702 to 0703, which would be deficient by 0.5 cfs. All other capacities would be sufficient to handle the project development flows. The recommendations made in the Drainage Engineering Report prepared by Boyle Engineering would need to be implemented in order to convey existing runoff as well as future Harbor Boulevard corridor flows from implementation of the Harbor Corridor Plan. Mitigation has been provided at the end of this section requiring that improvements outlined in the Drainage Engineering Report, which are summarized in the drainage study prepared by IBI and highlighted in the detailed storm drain maps provided in the study (see Appendix F), be implemented by the City of Santa Ana. Additionally, during the City's development review process, individual development projects that would be accommodated by the Harbor Corridor Plan would be required to comply with the requirements in effect at the time building permits are issued, including payment of the required Drainage Area Master Plan Fees, as outlined in Santa Ana Municipal Code Section 34193. The Drainage Area Master Plan Fees are necessary in order to fund needed improvements to the City's drainage system to reduce the cumulative impacts caused by new development, and are apportioned to new development based on new development's fair share of the estimated costs of the improvements. These fees are payable at the rates in place at the time of building permit issuance. October 2014 Page 5.7 -21