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SECTION 2 <br />Study Area Characteristics <br />quality conditions. It is even more difficult to evaluate the water quality impacts of stormwater <br />runoff on receiving waters. Therefore, a variety of available sources of water quality - related <br />information was reviewed in an attempt to provide a general picture of water quality conditions <br />in the basin. The following sources of information were reviewed and are described below: <br />• Documented water quality problems based on existing chemical data, biological data, and <br />field observations. <br />• Oregon Department of Environmental Quality's (DEQ's) designations of water quality <br />limited water bodies. <br />• Natural and built environmental conditions that influence water quality. <br />2.6.1 Documented Water Quality Problems <br />The following subsections describe the water quality problems that have been documented for <br />the River Road Santa Clara basin in terms of chemical stormwater monitoring data, <br />macroinvertebrate sampling, and field observations. <br />2.6.1.1 Chemical Stormwater Monitoring Data <br />The City collected and analyzed samples of stormwater runoff from 1992 to 1997 at 6 sampling <br />stations in Eugene (see Figure 2 -5). The 6 sampling stations were selected to represent runoff <br />from various land uses. In 1998, the storm event monitoring at the 6 sampling stations was <br />discontinued and a pilot project on the A3 Channel using a basin approach to water quality <br />monitoring was implemented. The revised monitoring plan consisted of collecting monthly <br />composite samples at the original industrial land use station on the A3 Channel (station I1) and <br />collecting samples at selected high source areas in the piped system on the A3 Channel. <br />The following table provides a summary of the results collected during 1992 to 1997 from the 6 <br />sampling stations. Table 2 -5 includes a description of the problem pollutants, typical sources of <br />the pollutants, specific results from Eugene, and potential problems associated with the <br />pollutants. Although none of these data were collected from within the River Road Santa Clara <br />basin, they provide general information regarding stormwater quality in Eugene and were used in <br />this initial study towards the development of a stormwater basin master plan. <br />N:ASTORMWATER \City of EugencARR_SC Stormwater Basin Plan\2012 Document \Master_ Plan _9- 18- 12_DR-AFT Word Version.doc 2 -18 <br />