1914 HOLLOW DALE PL 2016-01-01 MF Import

( 14. Temporary erosion control measures for construction activity must be operational prior to commencement of any clearing or earthwork. 15. Storm water treatment is reyuired when 5,000 square feet or more of hydraulically-connected pavement is created arrd/or redeveloped by a project. Treatment of sronn water runoff from hydraulically-connected pavement must occur, per Ciry standards, prior to discharge of the srorm water from the site, or to a stream, weQand, or underground infiltration system. If suitable soils exis[ on the site, surface stormwater infiltration systems (e.g., pervious pavers or surface ponding areas and/or swales) may be used to hydraulic :Ily disconnect pavement. Prom a stormwarer treatment standpoint, fbr a pavement area to be considered hydraulically-disconnected, stonnwater runoff from at Icast the 6-munth, 24-hour stnrm must be fully retaincd and/or infiltrated. Stormwater detention is required when 5,000 square feet or more of h��draulically-connected impervious area is created by a project. If suitable soils exist on the site, underground infiltration systems (e.g., infiltration trenches) or surface stormwater infiltration systems (e.g., splash blocks, pervious pavers, or surface ponding areas and/or swales) may be used to avoid creating hyJraulically-connected impervious .irea from a storm��ater detention standpoint. Section 3-2.2 of the Ciry's Stormwater Management Manual lists site and design criteria that must be met. From a stormwater deteution standpomt, for an impervious area to be considered hydraulically-disconnected, srormwater runoff from the 100-year, 24-hour srorm nwst be fully retained und/or intiltrared - �+�ithout resulting in significant potential for adverse ef(ects from Q�e mtiltrated water (such as slope saturation or migration to cra��lspaces :md/or hasements). However, if thc on-site soils cannot support full intiltration of the 100-year, 24-l�our storm, par�ial infiltration may still be f'easible to mcet allowable srormwater release reyuirements. Short plats creating bet��een 5,000 and 10,000 syuare feet of hydraulically-connected pavement must treat storm�vater runoff in a�vetvault designed in accordance �vith City standards. The dead storage volume of the vaulUtank shall be equal to the developed runoff from the G month, 24-hour storm. If this project will create more than 10,000 square feet of hydraulically-connccted pavemene, a wetpond shall be reyuired to provide runoff treatment. The wetponJ shall be designed to me�t the cnteria found in Section 3-1.9 f the Ciry's Stormwater Management ManuaL All stormwater facilities shall be designed in accordance with Ciry standards. 16. Tablc I-�.7 of the City's Storm��arer Manaeement Manual Qast re��ised in April of 2000) contains an error in the "n" values fbr sheet tloo�. The colunm of values should read "0.011, 0.05, U.15, 0.24, 0.41, 0.13, 0.40, O.SO). 17. Requircnrent for �4aintenancc �Varranty I3ond - atier satisfactoq� completion of the detention/rctention or oiher drainage treaunent/abatcment facilities and relcase of anv pertbrmance hond by thc city, dic developer constructing the drainage facilities must satisfacrorily maintain the facilities for a two-year period. A 11181(1LCI71IlCC ��'arranty bond in an amount eyual to l0 r�, of the cost of construction of the drainage 1'acilities musi be posted and maintained throughout the t�a�ryear drainaee facility maintcnance period. This bond may he used by the city to correct deficiencies in maintenance of the drainage t'acilities. In addition, the ��arranty bond shall cover the cost of design defects and/or lailures in workmanship of the facilities throughou[ Ihe two-ycar maintenance period. Altcrnatively, an cyuivalent cash deposit to an escro�v account administered bJ� a local bank designatcd by the city may be acccptable. I�IRG DLP:\RTAIEN'1' C0�1�1CN'PS - Rick Rohinson (�25) 2i7-R123 18. A firc hvdrant is rruuired ��ithin 350 dri��ine fcet of c�•erV one- or ta�o-familv dwellinc strucwrc. This hvdrant must also be. on a water main caaable of arovidine 1.000 c�m. If this is ncc the case, immediately contact Assistant Fire Marshal Rick Robinson at 425/257-8123. 19. Pire Plo�� - 1�7inimum tire flo��• reyuirements for single and two-famil�� residences under 3600 squarc fect is 1000 �pm; o��cr 3G00 syuarc feet, fire tlow is according to 2003 Intcrnational Fire Code. Appendix E3. 3�