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 Pollutants listed as impairing receiving water bodies are in Table 5.7 -3, Abater Quality lVedrments. Of those pollutants, dieldrin and chlordane are not anticipated or potential pollutants from the proposed project because they are mainly used as agricultural insecticides and because nearly all uses of these two pesticides have been halted in the United States. Most uses of dieldrin were banned in the United States in 1987 (USEPA 2011b), and most uses of chlordane were voluntarily halted in the United States in 1988 (NPIC 2001). Therefore, pollutants of concern for the proposed project include: pathogens, heavy metals (copper, lead, and nickel), nutrients (un- ionized ammonia), organic compounds (PCBs), and sediment toxicity. Operation of projects within the Harbor Corridor Plan could result in a significant impact on stormwater quality, because of the potential pollutants that may be generated from the proposed land uses. Water Quality Management Plans Priority development projects within the Harbor Corridor Plan would be required to prepare and implement water quality management plans (WQMPs) specifying BMPs to minimize water pollution by the project. Categories of BMPs included in WQMPs are described in Table 5.7 -7. Table 5.7 -7 Cateqories of BMPs in WQMPs Category I Purpose Examples BMPs Used in Project Design • Minimizing impervious areas and directly connected Site Design BMPs Reduce or eliminate postproject runoff impervious areas. • Inclusion of infiltration basins and detention or retention basins in project designs. October 2014 Page 5.7 25 • Roof runoff controls Structural Source Control BMPs Reduce the potential for pollutants to Protection of slopes and channels enter runoff Efficient irrigation • Storm drain system signage • Biofiltration through constructed project landscape Treatment Control BMPs Treat contaminated stoonwater before the elements such as bioswales, infiltration trenches, water is discharged offsite and /or infiltration basins. • Filters BMPs Used in Project Operation • Education of owners and employees Reduce the potental for pollutants Activity restrictons, such as requiring that trash can Nonstructural Source Control resulting from activites onsite to enter lids be closed at all times and prohibiting outdoor BMPs runoff. cooking. • Periodic inspections of water quality features such as catch basins and filters. October 2014 Page 5.7 25