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Admin Order 58-14-06
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Admin Order 58-14-06
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Last modified
10/14/2014 11:24:27 AM
Creation date
10/14/2014 11:04:31 AM
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City Recorder
CMO_Document_Type
Admin Orders
Document_Date
10/13/2014
Document_Number
58-14-06
CMO_Effective_Date
10/13/2014
Author
CRO
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1.14 EQUIVALENT ON -SITE AREA GUIDELINES <br />Equivalent on -site areas are existing impervious surface areas that would otherwise not <br />require stormwater quality treatment, being an equal or greater surface area of the new or <br />replaced impervious surface area that requires stormwater quality treatment of its . <br />stormwater runoff. <br />When designing a stormwater quality system using equivalent on -site areas, plans shall <br />show and identify the follawing information: <br />• The new or replaced impervious surface areas_ which, by code, require stormwater <br />quality treatment of its stornrwater runoff. - <br />• The new or replaced impervious surface areas which, by code, require stormwater <br />quality treatment of its stormwater runoff, but will not receive stormwater quality <br />treatment. <br />The equivalent on -site (Le. existing) impervious surface areas which will receive <br />stormwater quality treatment of its stormwater runoff. <br />Using the square footages from the bulleted items above, the stormwater quality treatment <br />facilities shall be sired using either the Simplified or Presumptive Approach. <br />The use of equivalent on -site areas to meet stormwater quality standards does not exempt <br />new or replaced impervious surfaces from having to meet flood control, flow control, on <br />control, or source control standards. The redesign of existing surfaces must meet current <br />codes, including stormwater management <br />5tormwater Management Manual 1 -26 <br />Eugene 2014 <br />
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