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. , i <br /> , <br /> other information on file with ihe City. The listed requirements are placed in response to our j <br /> revicw ofthis information: i <br /> � <br /> AGENCIES WITH 1URISDICTION: None I <br /> I <br /> MITIGATION OF ADVERSE IMPACTS BY SEPA: Same as previously stated. <br /> MITIGATION REQUIRED BY EXISTING CODES AND ORDINANCES <br /> Under mitigation required by the existing codes end ordinences in the previous DNS, items 5 and <br /> 6 arc deleted and the following are additional conditions for this proposal: <br /> I. Water quality enhancement of stormwater ruuoff from the paved ereas must occur, per City <br /> standards, prior to discharge of the stortnwater from the site or to a stream or wetland. <br /> 2. Stortnwater detention/retention, quality protection, and enhancement requirements for this <br /> project shall be those requirements in effect at the time of application for Public Works <br /> permits. Currently, three options for stortnwater quality enhancement are presented in the <br /> current Ciry standards. The least preferred option is allowed only if the 6rst two options are <br /> infeasible in the opir,ion of the Public Works Depertment. The options for stortnwater quality <br /> enhencement are, in order of preterence: <br /> (a) an infiltration basin designed and constructed according to City standards, if suitable <br /> soils cxist on the sitc; <br /> (b) a wetpond designed and constructed ro City stenderds; and � <br /> (c) a baHle-type oil/water separator followed by a vegetated swale, both designed and <br /> constructed according ro Ciry standards. � <br /> 1 <br /> 3. The presence of wetlands on the site indicates that the soils are probably not suitable for � <br /> infiltration. Howevcr, it does appear that a wetpond is feasible, particularly if the City's � <br /> wetvault/wetlend treatment cell option is utilized. Therefore, a wetpond will be required �' <br /> instcad of a baHle-type oiVw•ater separator in series with a vegetated swale. � <br /> 4. No stormwater facilities, with the exception of neccssary discharge systems, may be located r <br /> inside wetland or stream buffer areas. Natural wetlands may not be used for detcntion of <br /> stormwater. <br /> 5. Devclopment of thc site must not adversely affect the hydrology of the adjacent site's <br /> wetlands. The quantity and rate of water entering the wetlands must be detertnined for <br /> current conditions. Under developed conditions a similar rate �vid quantity of roof dreinage or <br /> treated runotT must continue to be discharged to the wetland(s). Prior to aPplication for <br /> building pertnits and plan review by the Public Works Department, a charactenzation of the <br /> hydrology of thc wetland(s) on or adjacent to this pro'ect that may be affected by the <br /> dcvelopment of this site must be submitted to and approve�by the Planning Department. <br /> 6. On-site detention is rcquired per City standards, OR, in lieu of providing on-site detcntion, if <br /> thc downstream stortnwater systems have the capacity to handle the additional runoff, <br /> payment to Citv Drainage Fund k340 is allowed by the City. M easement from the <br /> Department of Transportntion will probably be required for stortnwater discharge north to <br /> their systcm. Detention of stortnwater before discharge may be a requirement of the <br /> Department ofTransportation. <br /> i <br /> z � <br /> � <br />