Item 4: PH - Ordinance on Stormwater Development Standards

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ECC UGENE ITY OUNCIL AIS GENDA TEM UMMARY Public Hearing: An Ordinance Concerning Stormwater Provisions; Amending Sections 9.0500, 9.6420, 9.8030, 9.8055, 9.8090, 9.8100, 9.8215, 9.8220, 9.8320, 9.8325, 9.8440, 9.8445, 9.8515, and 9.8520 of the Eugene Code, 1971; Repealing Section 9.6520 of that Code; Adding Sections 9.6790, 9.6791, 9.6792, 9.6793, 9.6794, 9.6795, 9.6796, and 9.6797 to that Code; and Providing an Effective Date Meeting Date: April 10, 2006 Agenda Item Number: 4 Department: Public Works Engineering Staff Contact: Peggy Keppler www.eugene-or.gov Contact Telephone Number: 682-2869 ISSUE STATEMENT The purpose of this public hearing is to solicit testimony on the proposed code amendments to Chapter 9 (Attachment A: Draft Ordinance) to include post-construction standards for stormwater management. BACKGROUND A City Council work session was held March 13, 2006. The council requested that staff review two areas of interest before the public hearing. First, Councilor Kelly requested that more information regarding the substance of the Stormwater Management Manual be added to the ordinance. Staff has redrafted the ordinance (Attachment A) to include a section that sets forth goals with which the adopted Stormwater Management Manual must be consistent. The second request was to provide the rationale for the exemption of one- and two-family residential development from pollution reduction and flow control standards. Except for one- and two-family residential development on existing lots of record, and new lots created by partitions, the proposed stormwater development standards are applicable to all development surpassing a threshold of 3,000 square feet of impervious area. While all new areas of impervious surface have some impact on stormwater quality and the volume of stormwater runoff, exemptions for single-family and duplex development on existing lots of record and minor partitions are recommended in order to balance water quality with other considerations. The proposed exemptions take into account the following considerations: Equity between various land uses in implementing the new regulations was also a factor. ? Exempting single-family and duplexes on existing lots and minor partitions is comparable to the exemption of 3,000 square feet of impervious surface area for commercial and industrial development. Exempting anything less than four residential lots would equate to a total development size of 18,000 square feet (i.e. 4,500 sq. ft. x 4) or less. Assuming that 15% of the residential site is impervious surface that would equate to 2,700 sq. ft. of impervious surface area. Rounded up, that is roughly equivalent to the 3,000 square foot of impervious surface area threshold for applicability of the stormwater development standards to commercial and industrial land uses. L:\CMO\2006 Council Agendas\M060410\S0604104.doc