4027 4TH ST SE 2018-01-01 MF Import

ATTACHMHNT "A" _ p, 2 The sludge has been analyzed according to Snohomish County Shoreline Management Program requirements. (Attachment No. 5) An operational plan will be included in the applications for sludge utili.zation, in accordance with the Snohomish liealt_i District's requirements. (3) Scum Collection and Disposel.-- The City also pro- poses to erect a scum-containment barrier in the aerated lagoon, as part of its Stage I improvements. The Uarrier will be loc�ted at the northwest corner of Aeratioti Cell No. 1, in order to screen the in£luent from the headc:.rks. The barrier, designed as a sort of floating curtain, 'ill guide scum (fats, oils, and grease) and floating debri. to the edge of the lagoon. 1'he scum and debris will then be removed by one of the City's "Yactor" vehicles and disposed of at the Snohomish Cuunty Landfill. (4) Administration Building.--Also as part o° the Sta�*e I improvements, the City plans to erect a new 9500 square £oot building to house the treatment plant's laboratory, administratinn, and maintenance activities. The building will be located just west of the e�isting headworks facilit`� (Attachment Yo. 4, Sheets No. 2 and 4). The new building will be 100 feet in length, lOJ fe�t in width; the building's highest p�int will be 25 feet above the new grade, or 37 feet above�the e�cisting grade at an elevation of 44.1 feet (YOS datum). To bettei a:commodate the location of this facility, as well as that of certain others planned in Stage II, 4th Street SE wi'_: be relocated appro-cimately 100 feet to the north (Attachtaent No. 4, Sheet No. Z). The relocated road will not cross any designated wetlands. (5) Effluent Tide Gate Repair.--To improve the effi- ciency of the treatment plant's effluent-disinfection pro- cess, the City will repair the effluent tide gate located or. the shore of the Snohomish River, directly Nest of the chlorine contact channel. The repair involves the installa- tion of an additional part to assure the plumbness of the tide gate. At present, the tide gate does not properly close; consequently, some backflow from the river erters the treatment system during hish tide events. When repairing the tide gate, thc City will also in- stall a uew effluent flowmeter at the southern end of the existing chlorine contact channel. (6) Additionul Aerators. — To enhunce aeration in the aerated lagoon, !he City will install six (6) additional surface aerators.