Capital Drive <br />The applicant has stated that the additional road widening of Capital Drive is too small to justify <br />the cost of water quality treatment, and therefore has proposed no treatment facilities for this <br />portion of the project. This is inconsistent with Eugene Code, as stated in EC 9.6792(3)(b), which <br />requires infiltration, filtration, or mechanical facilities to treat the runoff of a proposed public <br />street. For compliance with this standard, the following condition is warranted: <br />• The final plans shall be modified so that the stormwater runoff on the north and south <br />ends of the additional Capital Drive road width will be treated through either filtration or <br />mechanical treatment methods in compliance with the Public Improvement Design <br />Standards manual. <br />Private Roadway <br />The applicant has proposed to provide a filtration facility for the runoff of the east side of the <br />private street through the use of a filter strip and level spreaders. The applicant has stated that <br />the runoff on the north and south ends of the proposed private street will be too small to <br />justify installing on-site treatment methods and proposes to pay a higher rate of system <br />development charges (SDC) for the impervious area created. This proposal is inconsistent with <br />the requirements of EC 9.6792(3)(c), which requires either infiltration or filtration facilities to <br />treat the runoff of a proposed private street. For compliance with this standard, the following <br />condition is warranted: <br />• The final plans shall be modified so that the stormwater runoff on the north and south <br />ends of the proposed private street will be treated through a filtration facility in <br />compliance with the Stormwater Management Manual. <br />Individual Lots <br />The applicant has stated that individual lots will address flow control and water quality <br />standards when applying for building permits on a case by case basis. The applicant also <br />suggests that possible water quality mechanisms for the lots include: mechanical treatment, <br />lined planters, rain gardens, sand filters, or swales. Staff concurs that the water quality <br />standards for the individual lots will be addressed on a case by case basis at the time that each <br />lot applies for a building permit. <br />Based on these findings, and with the recommended conditions of approval, this standard is <br />met. <br />EC 9.6793 Stormwater Flow Control (Headwaters <br />The site is located above elevation 500, triggering the need to meet flow control requirements. <br />Tables 1 and 2 of the applicant's Stormwater Management Plan and Drainage Study outline the <br />discharge locations and flow rates under existing conditions and proposed conditions, <br />respectively. <br />Capital Hill PUD (PDT 17-1) February 2018 50 <br />Page 50 <br />