5901 23RD DR W BASE FILE 2016-01-01 MF Import

17. A traffic mitiga[ion fee of 574,�00.00 is required prior to issuance of any permits. 18. Eity standards require treatment of storm water runoff from hydraulically-connected pavement prior to discharge of the swrm water from the site, or to a stream, �vetland, or underground infi.ltration system. 19. Storni water treatment is required when S,J00 square feet or more ot"hydraulically- connecred pavement is created and/or redevelored by a project. Treatment of storm water runoff Prom hydraulically-connected pavement must occur, per City standards, prior to discharge of the storm ��ater from the site, or to a stream, wetland, or underground infiltrntion system. • if�uitable soi'.s esis[ on the site, surface stormwater infiltration systems (e.p., pen�ious pavers ur surface ponding azeas and/or swales) may be used to a�•oid creatine hydraulical]y-connccted pavement from a storm�i�ater treatment standsrd. • From a stormwa[er treatment standpoint, for a paved area to be considered hydrauli:ally- disconnected, stormH�ater runoff from at leas[ the 5-month, 24-hour storm must be fuily retained and/or infiltrated. The options for treatment of runoff from hydraulically-connected pavement are: • an infiltration basin widi pmtreaunent*, if suitable soils exist on [he site • a �.vetpond • a constructed wetland • a storm��:ater technology that has received a GULD (General Use Level Designa[ion) from d'�e Washington Stnte E`::parm�ent of Ccology for either basic or enhanced treatment, with pmtreatment* ?0. *acceptable pretreatment systems are either a wetvault or tanl: designed in acr,ordance wiUi City standards 1nd containing 30%of the 6-month. 24-hour storm as dead storaee, or a pretreatment system that has obtained a GULD for pretreatment from the \�'ashington Stnte Department of Gcologv Z 1. Stormwater detention is required ��hen �,000 square feet or more of hydraulicall��- connected impervious arca is created by a project. • If suitable soils exist on the site, widereround infiltration systems (e.g., infiltration - trenches) or surface storm��ater infiltration systems (e.g., splash blocks, pervious pavers, or surface ponding areas and/or swales) ma�� be used to avoid creating hydraulically- connected impervious area from a stormwater detention standpoint. Section 3-?.2 of the City's Srormn�ater Management Manual lists si[e and desien criteria that must be met. • From a storm��ater detention s[andpoint, for an impervious area to be considered hydraulicalh�-disconnected, stormwater runoff from the 100-year, ?4-hour storm must be ��