2012-08-28_PWETC_AgendaPacket - Laserfiche WebLink

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on � 0o. 3 A s o m m 3 < N. m m U) N M v m v v m 3 m v r U U MM � N � O � N � N N N Table 6 Watershed District Standards Summary Project size Development or redevelopment 1 -acre or Projects disturbing greater than one acre of Projects disturbing greater than one acre of applicability greater, single family residential development land, or 10,000 square feet of land adjacent land. 5 -acres or greater; size thresholds do not to a waterbody and repairs, replaces, or apply if the site is within the 100 -yr creates impervious surface. floodplain, within 1000' of a public water or wetland, or within 300' or Rice Creek, Clearwater Creek, or a public ditch. (See additional applicability for ESC). Water Stormwater BMPs shall remove 90% of total Developments shall incorporate effective Quality BMPs sized to treat runoff from a two -year suspended solids from the runoff generated non -point source pollution reduction BMPs to (2.8 ") storm under the developed condition. by a 2.5 -inch rainfall event (NURP water achieve 90% total suspended solids removal For redevelopment disturbing less than 50% quality storm). from the runoff generated by a NURP water of the existing impervious surface and quality storm (2.5" rainfall). Volume increasing the impervious surface by less than Stormwater runoff volume reduction shall be Stormwater runoff volume retention shall be Control 50% the standard is the 0.8" event rather achieved onsite in the amount of one inch of achieved onsite in the amount equivalent to than the 2.8" event. runoff from impervious surfaces. the runoff generated from a one inch rainfall over the impervious surfaces of the development. Rate Control Proposed runoff rates at the site boundary, in Runoff rates shall not exceed existing runoff Runoff rates for the proposed activity shall aggregate, must not exceed existing rates for rates for the 2 -year, 10 -year, and 100 -year not exceed existing runoff rates for the 2- the critical two -year and 100 -year frequency critical storm events. year, 10 -year, and 100 -year critical storm events. events. Wetland Permitted bounce and inundation period Wetlands shall not be drained, filled wholly or All Stormwater must be treated to the water bounce/ based on susceptibility classification of in part, excavated, or have sustaining quality standard outlined in Rule C.d.3 before inundation wetland (see Rule C paragraph 7). hydrology impacted such that there will be a discharge to a wetland. decrease in the inherent (existing) functions and values of the wetland. Wetland NA A minimum buffer of 25 feet of permanent Wetland buffers shall be required for all buffer District approved non - impacted vegetative developments adjacent to a wetland whether ground cover abutting and surrounding a or not the wetland is located on the same wetland is required. parcel as the proposed development. See Rule E, Table 4 for average and minimum wetland buffer widths.