Resolution 4600 - Laserfiche WebLink

5. A wetpond is required to treat stormwater runoff from this project, in accordance with the standards which were in place at the time SEPA application was made. Due to the location and topography of the site,the wetpond must be designed to minimize the future chance of failure of the pond and/or adjacent slopes. The final design must be approved by a geotechnical engineer. At a minimum, the surface portion of the wetpond must be designed and constructed to prevent seepage of water from the pond into the ground. The wetpond should also be designed fully utilizing a wetvault or wet-tank to minimize the volume and depth of water in the surface portion or the pond. A concrete wetvault is the preferred option for the provision of the required wetpond deep storage. The wet-tank option may only be utilized if the system can be sealed to prevent leakage and the type of pipe chosen will not be subject to corrosion in the future. To further minimize the volume and depth of water present in the surface portion of the wetpond, all live storage required to meet City stormwater detention or wetpond standards should be provided in the underground system located under the street. (SEPA Water Policy) 6. Roof-top runoff should be discharged to roof downspout infiltration systems designed and constructed in accordance with City standards, if suitable soil conditions exist on the site and if slope stability will not be adversely affected. (SEPA Water Policy) 7. All collected surface water exiting the subject property must be conveyed to the nearest established, stable drainage course within the naturally occurring drainage basin,by pipe or by an approved swale, in a manner that will not result in erosion or flooding. Sufficient downstream information and analysis must be provided to enable the City to determine that this requirement is being met. Appropriate easements will be required if conveyance must occur across private property. (SEPA Water Policy) 8. The "Geotechnical Engineering Report"of July 1997 must be adhered to throughout construction of the plat. The soils expert must submit a report to the City Engineer after the completion of earthwork that he monitored construction and all earthwork followed his recommendations. (SEPA Earth Policy) 9. Prior to final approval, the owner(s)of the property must provide the City with a covenant running with the land in a form suitable for recording approved by the City Attorney's Office. The covenant must require that the owner, his/her successors or assigns indemnify, defend and hold harmless the City of Everett, its officers, employees and agents and waive any claim against the City for damage or injury including death which arises from earth movement(including ground/surface water conditions, slope failure, geologic hazards, incisions, block failures, etc.)whether manmade or natural either on or off the site arising out of the issuance of any permit(s) authorizing development on the site and from the design and construction of the vault on Tract 998, including the maintenance and use of its cover for recreational purposes. Further, the covenant must provide that in the event the recreational facility is in any way damaged as a result of the maintenance or use of the underlying vault, its repair shall be the sole obligation and expense of the property owner(s),his/her successors or assigns. (SEPA Earth Policies, SEPA Land and Shoreline Use Policies) 8