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City of Everett 01 11 00 - 9 <br />Port Gardner Storage Facility – Facility Construction Package WO# UP-3525 <br /> <br />01 11 00 - 9 SUMMARY OF WORK <br />Category 2: Sensitive information <br />Category 2: For official use only / disclosure permissible by law. <br />4. Construction of supporting infrastructure needed to install <br />temporary slide gates for stormwater treatment channel <br />isolation. <br />5. Installation a permanently affixed vactor tube systems atop <br />two of the interior walls that may be used for stormwater <br />treatment system maintenance. <br />c) Civil <br />1. Regrading and paving around the stormwater treatment <br />system. <br />9. Lift Station 46 <br />a. Work within Area 46 involves construction of a greenfield pump station, <br />Lift Station 46 (LS46), located in the southeast corner of the site’s <br />northern parking lot. LS46 will be an approximately 950 square foot <br />pile supported structure housing two separate sets of submersible <br />wastewater pumps installed in a common wet well. This pump station <br />will convey site stormwater, sewer water stored within PGSF, and local <br />sewer flows from CO 28 offsite to adjacent wastewater conveyance <br />infrastructure. Area 46 construction activities include structural, <br />architectural, process mechanical, electrical, instrumentation and <br />controls, and site civil work. <br />1) Structural <br />a) Area 46 structural work encompasses all elements of work <br />associated with construction of an approximately 28-foot deep, <br />530 square foot, pile supported wet well. The wet well design <br />includes an ogee ramp, center channel, and pump mounting <br />bases integrated into the channel fillets. The southern wall of <br />the wet well includes a penetration for a 24-inch diameter <br />pipeline that will convey flows into the lift station. <br />b) In addition to the wet well, LS46 includes a pile supported valve <br />vault adjacent to the wet well. This valve vault is designed to be <br />approximately 10-feet deep and cover a 400 square foot area. <br />The vault will share its western wall with the wet well and house <br />various process mechanical equipment including piping and <br />valves. <br />c) The pump station wet well and valve vault are to be constructed <br />with a topping slab that will sit approximately 1.2-feet above <br />grade. This slab will be constructed with penetrations for access <br />hatches. <br />d) The LS46 wet well and valve vault will be covered by an open <br />air building constructed of tubular steel material. This structure <br />will support an electrically powered bridge crane for removal <br />and installation of pumps within the wet well. The crane system <br />will extend beyond the immediate envelope of the building for <br />loading/unloading of service vehicles.