c Ot REIGtl <br />M E 'A DOW <br />upon in a subsequent meeting on January 30th, 2013, by Neil Bjorklund with <br />the city's Public Works department. If deemed necessary, as a supplement, <br />the PUD shall comply with the City's Level Spreader Design requirements, <br />including complying with proper installation guidelines. <br />EC 9.6792 - Stormwater Pollution Reduction <br />Findings: Treatment of stormwater from the site conforms to the treatment <br />options listed in the Eugene Stormwater Manual and consists of pervious <br />pavements, 15 rain gardens, and a vegetated swale. Pervious pavement will <br />be located in the parking stalls, the entry, and the fire turnaround. <br />Site walking surfaces and the roof tops of the homes will utilize the 15 rain <br />gardens around the site. Each rain garden is sized to treat and reduce flows <br />to pre-development rates. Sizing of the rain garden was performed by using <br />the City of Eugene Stormwater Surface Filtration/Infiltration Facility Sizing <br />Spreadsheet. <br />Stormwater run-off from the automobile garage, drive strip, and Common <br />House buildings will be piped to and treated by the proposed 10-foot wide by <br />58-foot long vegetated swale located adjacent to the Common House to the <br />East. A berm at the end of the swale will act as a weir to reduce flows to pre- <br />development rates. The swale was sized using the presumptive method. <br />EC 9.6793 - Stormwater Flow Control <br />Findings: The development site is not located in the headwaters area and is <br />therefore exempt. However, to protect the adjacent down-hill property, <br />flows will be reduced to pre-development rates as stated above. <br />EC 9.6794 - Stormwater Oil Control <br />Findings: The development site is a residential lot and is not expected to <br />have a daily traffic count greater than 100 vehicles per 1,000 square feet of <br />gross building area, which will not result in 100 or more off-street parking <br />spaces. As such, this PUD is exempt from this criterion. <br />EC 9.6795 - Stormwater Source Controls <br />Findings: The PUD triggers one source control measure. The trash enclosure <br />will comply with the source control requirements of the Eugene Stormwater <br />Manual by providing a hydraulically isolated, covered, and well-drained <br />facility. The stormwater thence will flow to the sanitary sewer system. <br />1394 PUD Tentative -June 14, 2013 Page 35 of 46 Oakleigh Cohousing PDT 13-0001 <br />