Item 2D: Resolution Concerning Modifciation of Stormwater SDC

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the stormwater SDC related to the 2,000 square feet of added impervious area. Using current SDC rates of $0.165 per square foot, this development would normally be charged $330.00 stormwater SDC but would qualify for a 10% or $33.00 reduction, resulting in a net SDC of $297.00. 2) Those sites where a portion of the site impervious area is subject to the standards for stormwater pollution reduction but treat runoff from 20% or more impervious area than the minimum required may also qualify. An example of this qualifying development type is a commercial development constructing a building addition. The example development is adding more impervious area than the minimum threshold which triggers stormwater quality development standards, e.g. 10,000 square feet, but chooses to construct an approved water qualify feature which treats runoff from more impervious area than the minimum required. In this case, the development standards would require that runoff from a minimum of 10,000 square feet at the site be treated through a facility or methods specified in the stormwater design manual. Assuming construction of an approved facility which treats runoff from at least 12,000 square feet of the site’s impervious area (meeting the credit criteria of 20% additional area over the minimum required), the development would qualify for a 10% reduction of the stormwater SDC related to the 10,000 square feet of added impervious area. Using current SDC rates of $0.165 per square foot, this development would normally be charged $1,650.00 stormwater SDC but would qualify for a 10% or $165.00 reduction, resulting in a net SDC of $1,485.00. 3) Sites where all of the site impervious area is subject to the standards for stormwater pollution reduction which use impervious area treatment reduction techniques to manage runoff from a minimum of 20% of the total impervious area of the development site may qualify. An example of this type of development is a medium-sized single family residence being constructed on a site subject to the standards and which implements an approved impervious area runoff reduction facility, such as an eco roof & roof garden. Assuming the area treated by the eco roof & roof garden is at least 20% of the gross impervious area at the site, this residence would qualify for a 10% reduction if the normal stormwater SDC for a typical residence. Using current SDC rates of $478.50 per medium sized single family residence this development would qualify for a 10% or $47.85 reduction, resulting in a net SDC of $430.65. Development meeting minimum requirements and qualifying for a credit. As illustrated in the examples above, most development types must exceed minimum requirements of stormwater development standards to qualify for an SDC credit. In addition, development subject to stormwater development standards which uses treatment impervious area reduction techniques in order to meet minimum requirements may also qualify for a reduction. Numerous options are available for development to meet minimum requirements of the stormwater development standards; a credit is proposed only for those using impervious treatment area reduction methods to meet or exceed minimum requirements. This is intended to encourage impervious area reduction methods which provide effective methods of pollution reduction by directly reducing the amount of gross impervious area from which runoff must be separately or additionally treated. Monitoring and enforcement program related to on-going requirements for private facility maintenance. An element of the implementation of stormwater development standards for pollution reduction facilities is implementation of a private facility maintenance monitoring and enforcement program. This program is necessary to ensure that the pollution reduction achievements related to construction April 4, 2006 Memo page 2