15 SW EVERETT MALL WAY COLPITTS 2016-01-01 MF Import

Mar 29 2007 3:34PM H�RttDesign�Group 4252522826 p.6 i5. A separate, (IQSIy1191@d d�a111 Ilne for each s',rip mall space that would serve the tenants' fats, oils and grease bearing kitchen dreins. The separate lines would be plumhed to a common 6rease interceptor aliead of the side sewer connection to city lateral. 16. Slorm�tiater ireatment is required when 5,000 square feet or more of hydr2ulicallyconne�ted pavement in•. created andlar redevetoped 6y a project. Treatment ot stormwater runofi from hydraulically- cainected pavement must occur, per City slandards, prior to discharge to Ihe storm water from the site, or to a stream, wetland cr underground infiHratian system. 17. If suRable soils exfsl on the site, surtace storm water infiltratian systems (e.g., pervious pavers or surface pondirg areas and/or swales) may be used to hydrautically disconnect pavemenl From a stormwater treatment siandpoint, for a pavement area to be considered hydrau;icaily disconnected, stormwaler runoff (rom at least the &month, 24-hour starm must t» fully retained and/or inflitrated 18. The options ior treatment of n�nolifrom hydraulically-conneded pavement are: a. Infiltration pond. b. Welpond. a Constructed Wetland. d. Stormwater 360 Storm Fllter, with pretreatmeni. e. Altemative treatment lechnology deemed, by ihe Ciry of Everett, to be technfcally equfvalerrt to the above optlons. 19. The reQuired stormwater treatment volume for watponds is the volume of developed runoBfrom the fi- month, 24hour storm. City standards far wetponds allow a maximum of B5% of this volume to be provided as underground dead storage in a wetvauk or tardc. A minimum of 159'0 oF the storm water treatment volume, however, must be provided in an open-to-the air vegebted treatment cell, Please see the City'� Slorrnwater Management Manual, Chapter 3-3 for more information. 20. Stormwater detention is required when 5,000 square feet or more of hydraullcaily connected impervious area is created by a projecl. 21. If suitable soils exist on Ihe sfte, underground infiltralion systems (e.g., infittretion trenches) or surtace slorm water infiltralion syslems (e.g., splash blocks, pervious pavers, cr surface ponding areas andlor swales) may be used to avoid creating hydraulically-connected impervious area from a slormwater detention standpoint. Seciion 3-2.2 oi the City's Stormwater Managemertt Manual lists sile and design c�ileria ihat must �e met. 22. From a slwmwater detention standpoint, tor an impervfous area to he considered hydraulically disconnected, slormwater runoH From the 100-year, 24-hour storm must be tully retained and !or (nflltrated without resulting in significant potential for edversa effects from the infiitrated water (such as slope saturation or migration to crawlspaces andlor basements), However, If the on-site soils cannot support fWl InfiRration of the 10Q-year, 24-hour storm parlial infiltretion may still be feasible to meet allowabie stormH�ater release requirements. 23. An NPDES (National Pollutant �ischarge Eliminalion System) permit, administered by Washington State's Department of Ecology, will be required for clearing and grad�g act(vides on this site'rf the site area disturbed by land alteralion activites is grater than or equai to one aae. 24. Per City policies, due to the proximity of the site io enviranmentally sensiGve areas, seasonal Iimltations may be placed on la�d alleration aclivities. l.and alteration adivities are detlned in the City's Desigri and Conslruction Standards and Speaficalions as cfearing, grubbing, excavation, filling, grading andd ad �S