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SECTION 4 <br />Water Quality Eualuatiou <br />construction per drywell cluster was estimated. It should be noted that the <br />installation of these neighborhood -scale rain gardens could also require land <br />acquisition. The CP cost estimates for neighborhood -scale rain gardens do not <br />include the piping that could potentially be necessary (in addition to the street <br />gutter system) to route flows to the rain garden. <br />Example: 68, 496ft2 x $8/ft2 $547,968 <br />Note: If the actual ROW in the drainage area represents a higher or lower <br />percentage of the drainage basin, the rain garden sizes would be somewhat higher <br />or lower. In addition, if engineered soils are used, a cost estimate of $29 /square <br />foot should be used (see Appendix D for unit cost tables). These methods for <br />sizing rain gardens that are described above are rough estimates made for <br />conceptual planning purposes. <br />This neighborhood scale surface infiltration facility /rain garden option was selected for the <br />following 22 drywell clusters (the list includes the CP IDs that were assigned): <br />Willamette Overflow Subbasin <br />WO -2 -UIC <br />Corliss/ Carolyn/ Onyx UIC Cluster <br />WO -3 -UIC <br />Autumn, Ross, Moore /Oak UIC Cluster <br />WO -5 -UIC <br />Silver Meadows UIC Cluster <br />WO -9 -UIC <br />Baywood UIC Cluster <br />WO -10 -UIC <br />Greenwood UIC Cluster <br />WO -1I -UIC Warrington UIC Cluster <br />Al- Channel Subbasin <br />Al -2 -UIC <br />Crocker 2 UIC Cluster <br />A14-UIC <br />Shirley 2 UIC Cluster <br />Al -7 -UIC <br />Anderson UIC Cluster <br />Al -8 -UIC <br />Escalante UIC Cluster <br />Al -10 -UIC <br />Grove UIC Cluster <br />Al-11-UIC <br />Exeter UIC Cluster <br />Al -12 -UIC <br />Brentwood UIC Cluster <br />Al-14-UIC <br />Howard UIC Cluster <br />Spring Creek Major Subbasin <br />SC -3 -UIC Zinnia 3 UIC Cluster <br />SC -6 -UIC <br />Byron UIC Cluster <br />SC -7 -UIC <br />Stark UIC Cluster <br />SC -8 -UIC <br />Castrey UIC Cluster <br />SC -9 -UIC <br />Calumet UIC Cluster <br />Flat Creek Major Subbasin <br />FC -I -UIC Willowbrook 1 UIC Cluster <br />FC -3 -UIC Willowbrook 3 UIC Cluster <br />FC -4 -UIC Maesner UIC Cluster <br />0:\25695978 Eugene RR -SC Final Basin P1an\Master P1anTINAL 2- 2010\Master_Plan 3- 11- 10_FINAL_ Word _Version.doc 4-12 <br />