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 Existing Conditions Regional Drainage The project area is in the Santa Ana River Watershed (see Figure 5.7 -1, Santa Ana River Watershen). The Santa Ana River Watershed includes much of Orange County, much of western Riverside County, part of southwestern San Bernardino County, and a small portion of Los Angeles County. The watershed is bounded by the Santa Margarita watershed to the south, on the east by the Salton Sea and Southern Mojave watersheds, and on the north /west by the Mojave and San Gabriel watersheds, respectively. The watershed covers approximately 2,800 square miles in area with about 700 miles of rivers and major. The Santa Ana River extends 96 miles from the San Bernardino Mountains in San Bernardino County to the Pacific Ocean at the boundary between the cities of Huntington Beach and Newport Beach. The part of the Santa Ana River Watershed in Orange County is apportioned into several smaller watersheds by OCWatersheds, an agency of the County of Orange Department of Public Works. The project area is in two of the watersheds designated within Orange County: the Anaheim Bay — Huntington Harbor Watershed and the Orange County portion of the Santa Ana River Watershed.' Anaheim Bag — Huntington Ha Lb or Watershed The Anaheim Bay — Huntington Harbor Sub watershed spans much of central and western Orange County. Drainage in the Anaheim Bay — Huntington Harbor Sub watershed is via the East Garden Grove - Wintersburg Channel, Westminster Channel, Anaheim Barber City Cbannel, and Bolsa Chica Channel, southwest to Bolsa Bay /Huntington Harbor, which is contiguous with the Pacific Ocean (see Figure 5.7 -2, Regional Drainage. Bolsa Bay, Huntington Harbor, and Anaheim Bay (in order from southeast to northwest) are all contiguous. The main outlet to the Pacific Ocean is at the west end of Anaheim Bay on the Seal Beach Naval Weapons Station in the City of Seal Beach. An inlet channel connects the southeast end of Bolsa Bay to the ocean. Bolsa Bay is in the Bolsa Chica Ecological Reserve managed by the California Department of Fish and Wildlife (CDF)V. Most of Anaheim Bay is in the Seal Beach National Wildlife Refuge administered by the US Fish and Wildlife Service. Huntington Harbor is a developed, small craft marina with mostly residential and some commercial land uses alongside channels. The outermost part of Anaheim Bay (nearest the ocean is an engineered port used by the Seal Beach Naval Weapons Station. Santa Ana Raver Watershed, Orange Count? Portion The Santa Ana River Watershed spans most of northeastern Orange County and part of central Orange County (see Figure 5.7 -2, Regional Drainage. Drainage in the Santa Ana River Watershed is southwest via the Santa Ana River to the Pacific Ocean. I The Santa Ana River Watershed designated by OCWatersheds is only pact of the section of the Santa Ana River Watershed in Orange County (see Figure 2, Regional Drainage). Page 5.74 PlaceWorkr