Abstract
 Evaluation of Water Quality Objectives for Santa Ana Basin Waterbodies Track: Water Resources Author(s): Stormwater Standards Study Task Force, Steven Wolosoff, Tracy Sigler, Dan Bounds, Don Schroeder Orange, Riverside, and San Bernardino Counties, representing stormwater dischargers throughout the Santa Ana Basin, through a task force managed by the Santa Ana Watershed Project Authority, are assisting the Regional Water Quality Control Board review beneficial uses and water quality objectives for inland surface waterbodies. This study required compilation of 30 years of bacteria data and development of queries to determine the relative frequency of exceedences of REC-1 use objectives. Results were joined to a layer of bacteria stations and multi-attribute symbology was developed. Stratification of the data record at each bacteria station tested several factors hypothesized to be responsible for exceedences, including wet weather and seasonality. The ArcGIS Spatial Analyst extension was used to allocate rainfall stations for each bacteria monitoring station facilitating the stratification. Exceedences of objectives based on bacteria samples collected during dry weather were compared between seasons. In this paper, results of this analysis will be presented and discussed. Stormwater Standards Study Task Force Santa Ana Watershed Project Authority (SAWPA) 11615 Sterling Avenue Riverside , CA 92503 US Phone: (951) 354-4220 E-mail: jbeehler@sawpa.org Steven Wolosoff CDM 2920 Inland Empire Boulevard, Suite 108 Ontario , CA 91764 US Phone: 909-945-3000 E-mail: wolosoffse@cdm.com Tracy Sigler CDM 2920 Inland Empire Boulevard, Suite 108 Ontario , CA 91764 US Phone: 909-945-3000 E-mail: siglertl@cdm.com Dan Bounds CDM 2920 Inland Empire Boulevard, Suite 108 Ontario , CA 91764 US Phone: 909-945-3000 E-mail: boundsdg@cdm.com Don Schroeder CDM 2920 Inland Empire Boulevard, Suite 108 Ontario , CA 91764 US Phone: 909-945-3000 E-mail: schroederdj@cdm.com |
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