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Table GB-1 Reach Identification

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2010 (GB Technical Report). Maps, tables and photographs included in the GB Technical Report are reproduced here directly or adapted and referenced appropriately. Additional observations and photographs made by Regional Board staff are also included in the analysis. 5.6.4.1 Watershed Description/Location The Greenville-Banning Channel watershed (approximately 9 mi 2) is located in Orange County and includes portions of the Cities of Costa Mesa and Santa Ana. See Figure GB-1. The channel length addressed in this UAA analysis extends approximately 3.35 miles from the confluence of the channel with the Santa Ana River upstream to the California Street crossing in the City of Costa Mesa. The UAA does not address tributaries to the channel, which include the Fairview Channel. 5.6.4.2 Reach Identification The GB Technical Report identifies and analyzes one reach of the Greenville-Banning Channel, which extends from the confluence of the channel with the Santa Ana River upstream to 1125 ft. upstream of Gisler Avenue in the City of Costa Mesa. Regional Board staff proposes a revised approach to reach identification, as described below. However, the data and analyses provided in the GB Technical Report with respect to channel morphology, surrounding land use, evidence of recreational activity, etc. in the channel are not substantively affected by this revised approach. For the purpose of designating water quality standards, staff proposes that the channel be divided into a tidal prism segment and one upstream reach (Reach 1). (Table GB-1: see als

Year: 2012
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