1215 80TH ST SW 2026-01-12 - Laserfiche WebLink

7. City streets are to be kept clear of dirt and debris at all times during construction. Dust suppression and street cleaning must occur as directed by the Public Works Inspector. S. Any grading/fill on this site shall be done so as to not impact the surrounding properties. 9. Stormwater shall be managed in accordance with City of Everett Stormwater Management Standards current at the time the public works/building permit application package is submitted to the City for review. • If this project will disturb an acre or more of land,the applicant will be required to obtain coverage under the Department of Ecology's Construction Stormwater General Permit. Information regarding this permit can be found at the following link: https://ecoIogy.wa.govfRegulations-Perm its/Permits - certifications Stormwater- eneral- ermits Construction-stormwater- ermit_ • Pretreatment in accordance with Ecology standards shall be provided upstream of underground detention systems with limited maintenance access for sediment removal. • Stormwater shall be managed in accordance with the City of Everett stormwater management standards current at the time the public works/building permit application package is submitted to the City of Everett. • The City's current stormwater management requirements for this project are given in the Department of Ecology's 2014 edition of the Stormwater Management Manual for Western Washington (2014 SWMMWW) and Section 4 of the City's current Design and Construction Standards and Specifications for Development manual (DOSS). • The Stormwater Site Plan for the project must clearly identify why each listed on-site stormwater management BMP(MR#5) is infeasible using the infeasibility criteria contained in the 2014 SWMMWW for each individual BMP. The presence of Alderwood Till soils(or other low permeability soils) is not,of itself,an infeasibility criteria because an infiltration rate of more than 0.3 inches per hour is considered a feasible infiltration rate for on-site stormwater management BMPs. The presence of perched groundwater may preclude the use of any of the infiltrating-type on-site stormwater management BMPs, but must be specifically checked and identified for each BMP against the specific BMP's infeasibility criteria. O The City requires a GULD rating from Ecology for the level of stormwater treatment proposed with any proprietary device. Additional information can be found on Ecology's website at the following web address: htt s: ecolo ,wa. ov Re ulations-Permits Guidance-technical-assistance Stormwater- ermittee- guidance-resources Emer in -stormwater-treatment-technolo ies • The most current GOLD approval from Ecology must be included in the Stormwater Site Plan if a proprietary device is used.This inclusion allows the City to go back and find out what Ecology's requirements were at the time of design if issues come up in the future. If the GULD requires the manufacturer to approve each device design or the project's site plan,the City will require a project- specific letter from the manufacturer which acknowledges their review and approval. • The placement of runoff treatment BMPs relative to the location of detention systems can cause interference between the flow control and runoff treatment functions of these types of BMPs. The effects of placement must be adequately accounted for in the design of the stormwater management facilities. For example, if a runoff treatment BMP is located downstream of a flow restrictor,the effect of any fluctuating water levels in the runoff treatment BMP will alter the stage-discharge relationship of the flow restrictor and the flow control standard may not be met. Similarly,the Page 7 of 13 Project No.SEPAIS-021 EVERETT