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SECTION 4 water Quality Eualuatiou <br />Figure 4 -4 <br />Comparison of Pre and Post - Development Hydrographs <br />While some of the waterways in River Road Santa Clara remain relatively undisturbed, many of <br />these conditions have been observed in the basin. Many of the open channel systems in this <br />basin are also lacking vegetated buffers, which is likely impacting stream temperatures. Section <br />4.3 provides a description of the water quality strategy developed to address both the potential <br />increases in pollutant loads and stream stability issues. <br />4.3 Development of the Water Quality Strategy <br />As shown in the stormwater basin master planning process flow chart (Figure 1 -1), Step 1 <br />included a compilation of basin characteristics. These basin characteristics are summarized in <br />Section 2.0 of this document. Step 2 in the process included problem identification under both <br />existing and future land use conditions. The results of this step for water quality are provided in <br />Sections 4.1 and 4.2 above. The next steps included the development of potential stormwater <br />management tools (i.e., capital projects or development standards) to address the identified <br />problems. This section describes the capital projects (CPs) and development standards that were <br />considered to address the identified water quality problems. <br />4.3.1 Capital Project Alternatives <br />Identifying potential CPs to address water quality concerns is very different from identifying CPs <br />to address flooding issues. With respect to flooding, specific capacity deficiencies are identified <br />through modeling and CPs are proposed to address those deficiencies. With respect to water <br />quality, pollutant discharges associated with urban runoff are ubiquitous. When the city -wide <br />basin planning project was initiated, the focus of developing CP alternatives for water quality <br />was on identifying the best opportunity areas for the siting of water quality CPs in developed <br />areas that would not be affected by stormwater development standards except over the very long <br />0: 25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 4 -7 <br />