Public Comment (8) - Laserfiche WebLink

northwest portion of the site, corresponding to gravity drainage and site topography, and involving a piped crossing of the westerly waterway. The proposed stormwater pipes located outside the streets are proposed within public utility easements (PUE). The discussion and condition of approval necessary to comply with EC 9.6500 relating to the need for Standards Review in advance of the PEPI permit and subdivision process acceptance of the final PUE locations is applicable here for the proposed waterway crossings. The available information indicates that the receiving system has the capacity to accommodate addition runoff from the proposed development. The proposed development complies with the stormwater destination standards of EC 9.6791. As noted in the Hydrology Report, a downstream deficiency for the future 10-year storm previously existed at segment 65344 - 66656 in Martin Street. The completion of Capital Projects AM06A and AM06B under City Project Number 3951 (City Contract No. 2007-09) has corrected these deficiencies. No other downstream deficiencies in the Amazon Channel, which is the receiving system for the proposed development, have been identified for the 10-year design storm, per modeling in the 2002 City of Eugene Stormwater Basin Master Plan, Volume II of VI for the Amazon Basin. The applicant responded to testimony about stormwater drainage in its August 22, 2012 post- hearing testimony. Specifically, the applicant noted the EC 9.6790(2) requires that post- development flows will not exceed existing pre-development flows and that the 2007 study explains how this will be accomplished. The applicant has not proposed any pre-treatment or detention for this portion of the development site, as required by current stormwater development standards. However, given the available data regarding the downstream system, and given the clear and objective nature of the balance of the stormwater development standards, the western portion of the development site can meet these requirements with the following conditions of approval: The final PUD plans and final subdivision plat shall note the following requirement: "At the time of development, each lot shall have its own filtration stormwater management system (e.g. flow-through planter) that is sized to meet the requirements of EC 9.6792 Stormwater Pollution Reduction and EC 9.6793 Stormwater Flow Control (Headwaters). Each lot owner will be responsible for maintaining its stormwater management system consistent with EC 9.6797 Stormwater Operation and Maintenance." During the PEPI permit process, the public stormwater system shall include City- approved proprietary stormwater treatment technology that meets the requirements of EC 9.6792 Stormwater Pollution Reduction and EC 9.6793 Stormwater Flow Control (Headwaters). The applicant's August 22, 2012 testimony accepts these conditions of approval and states that the applicant will comply with them. The applicant also responded to testimony about additional downstream flooding. Hearing Official Decision (PDT 10-2, CU 11-1) 30