<br />Ordinance -- Page 5 of 10 <br />selected from the Stormwater Management Manual and shall be based on the following <br />priority order: infiltration, filtration, mechanical treatment. <br /> <br />1. If selecting an infiltration or filtration facility to treat the stormwater runoff from the <br />public street, the facility can be sized to also treat the stormwater runoff from the single- <br />unit dwelling and duplex lots or parcels adjoining the public street based on full buildout <br />of those lots or parcels. <br /> <br />2. If using a mechanical facility to treat the stormwater runoff from the public street or <br />if the infiltration or filtration facility is not sized to also treat the stormwater runoff from <br />the adjoining lots or parcels at full buildout, all lots or parcels created by the land <br />division application shall comply with EC 9.6792(3)(d)-(g) at the time of development <br />permit application. <br /> <br />(c) For land use applications proposing construction of a private street or shared <br />driveway, stormwater quality facilities to treat the runoff from the proposed private street <br />or shared driveway shall be selected from the Stormwater Management Manual and shall <br />be based on the following priority order: infiltration, filtration. <br /> <br />1. An infiltration or filtration treatment facility to treat the stormwater runoff from the <br />shared driveway or private street can be sized to treat the stormwater runoff from the <br />proposed single-unit and duplex dwelling lots or parcels that adjoin the shared <br />driveway or private street based on full buildout of those lots or parcels. <br /> <br />2. If the infiltration or filtration facility is not sized to treat the stormwater runoff from <br />the adjoining lots or parcels at full build out, all lots or parcels created by the land <br />division application must comply with EC 9.6792(3)(d)-(g) at the time of development <br />permit application. <br /> <br />(d) For development permit applications, stormwater quality facilities shall be selected <br />from the Stormwater Management Manual and shall be based on the following priority <br />order: infiltration, filtration, off-site stormwater quality management. <br /> <br />1. If selecting a filtration treatment facility, the applicant shall submit a report that <br />demonstrates at least one of the following development site conditions exist: a. <br />Infiltration rates are less than 2 inches per hour; b. Bedrock is less than 5 feet below <br />the ground surface; c. Groundwater elevations are less than 6 feet; or, d. Ground <br />surface slopes are greater than 10%. <br /> <br />2. If selecting off-site stormwater quality management by contributing to the public off- <br />site stormwater quality facilities, through payment of a higher stormwater system <br />development charge adopted as part of the City’s system development charge <br />methodology, the applicant shall submit a report that demonstrates there is insufficient <br />land area to construct an approved infiltration or filtration facility by setting forth the <br />required size of the smallest infiltration or filtration facility needed for the development’s <br />impervious surface area and a site plan demonstrating that an approved infiltration or <br />filtration facility cannot be located on the development site without reducing the size of <br />Attachment A <br />Dated: November 6, 2024Agenda Page 10 of 27