Ordinance No. 20521 - Laserfiche WebLink

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9.6792 Stormwater Quality (1) Purpose. The purpose of EC 9.6792 is to reduce runoff pollution and mitigate the volume, duration, time of concentration and rate of stormwater runoff from development by implementing stormwater management techniques that promote the use of natural and built systems for infiltration, evapotranspiration and reuse of rainwater and that use or mimic natural hydrologic processes while capturing and treating approximately 80% of the average annual rainfall. (2) Applicability and Exemptions. (a) The standard in EC 9.6792(3)(a) applies to all land use applications submitted after March 1, 2014, that do not propose construction of a public street, private street or a shared driveway. (b) The standards in EC 9.6792(3)(b), (e) -(g) apply to all land use applications submitted after March 1, 2014, that propose construction of a public street. (c) The standards in EC 9.6792(3)(c), (e) -(g) apply to all land use applications submitted after March 1, 2014, that propose construction of a private street or shared driveway. (d) Except as exempt under EC 9.6792(2)(e), the standards in EC 9.6792(3)(d) -(g) apply to applications for all development permits submitted after March 1, 2014. (e) The standards in EC 9.6792(3)(d) -(g) do not apply to development permit applications: 1. For the construction of less than 1,000 square feet of new or replaced impervious surface within a 12 month period; 2. For interior alterations of an existing structure; 3. For the construction of more than 1,000 square feet of impervious surface that replaces existing impervious surface for purposes of maintenance or repair for the continuance of the current function, providing that as part of such maintenance and repair the applicant is replacing less than 50% of the length of the stormwater drainage system (including pipes, drainageway catch basins and drywells) on the development site; 4. For the construction of new or replaced impervious surface where all of the stormwater runoff from the impervious surface will discharge into an on -site, privately maintained underground injection control system that is registered and approved by the Oregon Department of Environmental Quality; 5. For the construction of a one or two family dwelling on a lot or parcel that was created by a land division application submitted and approved by the City prior to March 1, 2014, that is consistent with the approved land use application and the City's stormwater quality (pollution reduction) standards in place at the time of the land division application; or 6. For the construction of a one or two family dwelling on a lot or parcel that was created by a land division application that included the construction of a public or private street or shared driveway submitted and approved by the City after March 1, 2014, if the lot or parcel adjoins the public or private street or shared driveway and the facility within the public or private street or shared driveway is an infiltration or filtration facility designed and sized to accommodate stormwater runoff from the adjoining lots or parcels Ordinance - Page 3 of 12