(b) Development shall be setback at least 300 feet from the ridgeline unless there is a <br />determination by the city manager that the area is not needed as a connection to the city's <br />ridgeline trail system. For purposes of this section, the ridgeline trail shall be considered as <br />the line indicated as being the urban growth boundary within the South Hills Study plan area. <br />The subject property is located more than 300 feet from the south hills ridgeline. <br />(c) Development shall cluster buildings in an arrangement that results in at least 40% of <br />the development site being retained in 3 or fewer contiguous common open space areas. For <br />purposes of this section, the term contiguous open space means open space that is <br />uninterrupted by buildings, structures, streets, or other improvements. <br />The development provides contiguous common open space, identified as Tract A on the <br />applicant's plans, which is configured consistent with the above approval criterion. The <br />applicant notes that the common open space constitutes 12.51 acres, which is about 47 percent <br />of subject property. The applicant's written statement provides definitions of "buildings and <br />structures" to demonstrate compliance with the above approval criterion as well. <br />(d) Residential density is limited as follows: <br />1. In the area west of Friendly Street, the maximum level of new development per gross <br />acre shall be 8 units per acre. <br />2. In the area east of Friendly Street, the maximum level of new development per gross <br />acre shall be limited to 5 units per acre. <br />3. Housing developed as Controlled Income and Rent Housing shall be exempt from the <br />density limitations in subsections 1 and 2 above, but are subject to the other applicable <br />development standards and review procedures. <br />The PUD complies with the density limitations above. The development proposed by the <br />applicant (75 lots on 26 acres) would result in a residential density of about 3 units per acre, <br />which is below the limitation of five units per acre required by the property's location being <br />east of Friendly Street. <br />EC 9.8325(131: Stormwater runoff from the PUD will not damage natural drainage courses <br />either on-site or downstream by eroding or scouring the natural drainage courses or by <br />causing turbidity, or the transport of sediment due to increased peak flows or velocity. <br />The applicant responds to this approval criterion as follows: "Stormwater is not being added to <br />any natural drainage course onsite. The plans show that Stormwater from this site, after <br />treatment in onsite facilities, will enter the city's piped system at the north end of the site. <br />These facilities eventually discharge to the Amazon Canal, an engineered drainageway and part <br />of the city's stormwater system. In terms of impacts on the waterway offsite, the owners <br />understand this standard to mean that no damage will result if onsite stormwater detention <br />facilities are constructed to city standards to accommodate the 10-year design storm. The <br />Hearing Official Decision (PDT 10-2, CU 11-1) 33 <br />