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SECTION 2 Study Area Characteristics Figure 2 -6 Extent of Ouen Drainage Svstem in the River Road Santa Clara Basin (UGB) Miles per Square Mile River Road Santa Mara Basin Relative to of Open Drainage System in the the Range in Other Eugene Basins (milesfsq mile) River Road Santa Clara Basin The Range in other Eugene Basins 3.0 T 0 1 2 3 4 5 Figure 2 -7 Extent of Area as a Percentaue of the River Road Santa Clara Basin (UGB) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% Vacant land includes tax- lotted areas currently in vacant, agricultural, and timber uses. Figure 2 -8 Extent of 100 -Year Floodwav Fringe that is Vacant in the River Road Santa Clara Basin 1 44% 1 T 0% 10% 20% 30% 40% 50% 60% 70% Vacant land includes tax- lotted areas currently in vacant, agricultural, and timber uses. 2.6.4 Conclusions A summary of the above findings suggest that degraded water quality conditions exist in the River Road Santa Clara basin as follows: • Based on the analysis of stormwater runoff samples collected from Eugene and other urban areas in Oregon, the pollutants of concern that were identified are as follows: — Total Suspended Solids (TSS) — Nutrients — Heavy Metals — Bacteria — Oil and Grease • Commercial and industrial areas have shown to be the most significant contributors of specific stormwater pollutants. 0:A25695978 Eugene RR-SC Final Basin Plan \Master Plan\FINAL 2- 2010AMaster_ Plan _3 -11 -10 FINAL Word Version AW Sec 2 Corr.doc 2-24 Percent in River Road Santa Clara Basin Relative to Factors River Road The Range in other Eugene Basins Santa Clara Basin Remaining Vacant Lands* 29% T Existing Impervious Surface Area 34% T Projected Impervious Surface 51% Area T Wetlands 3% T 100 -Year Floodplain 12% T 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% Vacant land includes tax- lotted areas currently in vacant, agricultural, and timber uses. Figure 2 -8 Extent of 100 -Year Floodwav Fringe that is Vacant in the River Road Santa Clara Basin 1 44% 1 T 0% 10% 20% 30% 40% 50% 60% 70% Vacant land includes tax- lotted areas currently in vacant, agricultural, and timber uses. 2.6.4 Conclusions A summary of the above findings suggest that degraded water quality conditions exist in the River Road Santa Clara basin as follows: • Based on the analysis of stormwater runoff samples collected from Eugene and other urban areas in Oregon, the pollutants of concern that were identified are as follows: — Total Suspended Solids (TSS) — Nutrients — Heavy Metals — Bacteria — Oil and Grease • Commercial and industrial areas have shown to be the most significant contributors of specific stormwater pollutants. 0:A25695978 Eugene RR-SC Final Basin Plan \Master Plan\FINAL 2- 2010AMaster_ Plan _3 -11 -10 FINAL Word Version AW Sec 2 Corr.doc 2-24