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City of Everett 01 12 16 - 6 <br />Port Gardner Storage Facility - Facility Construction Package WO# UP-3525 <br /> <br /> <br />01 12 16 - 6 WORK SEQUENCE <br />8. Existing Swale Pump Station <br />a. The Contractor is advised that there is a functioning pump station on site just <br />south of Area 35 (the former clarifier). This is called the “Swale Pump Station”. <br />The Contractor is advised that this pump station is in service to handle <br />stormwater flows from the existing storm drainage from the PGSF site and <br />must stay in operation until site storm drainage is managed by the proposed <br />facilities or the contractor substitutes this system with an alternative system <br />provided by the Contractor at no additional cost to the City. The system pumps <br />stormwater east through an existing conveyance pipe atop an ecology block <br />wall along the south property line. This pipe discharges into a sanitary sewer <br />manhole near the southeast property corner and thence flows north through <br />existing sanitary mains to Lift Station 6. The stormwater effluent is then <br />conveyed north by Lift Station 6 to Lift Station 7 as combined sewage. The <br />Contractor shall be prepared to re-arrange discharge piping to other existing <br />sewer manholes as necessary to permit construction and installation as <br />required by the contract documents. This sanitary sewer east of the PGSF <br />property will be demolished as part of the WMVD project in the Summer of <br />2026. Alternative means of discharge piping shall be submitted to the City for <br />approval during construction when the piping must change as construction <br />progresses. <br />b. Power for the Swale Pump Station is currently fed from a power pole located <br />in the southeast corner of the site. This power supply is to be replaced and <br />rerouted to the Swale Pump Station from a temporary panel at the northwest <br />corner of Area 30. When transition of the source of power is necessary, power <br />to the Swale Pump Station must not be interrupted. Contractor shall be <br />responsible for the operation of the Swale Pump Station during construction. <br />See Temporary Construction Power Site Plans in Volume 7 Attachment I for <br />more detail of current temporary power arrangement. <br />c. Once the on-site storm sewer construction activities are complete, site paving <br />is complete, Lift Station 46 is complete and commissioned, and all other <br />construction dewatering activities have been completed, the Swale Pump <br />Station can be demolished. Swale pump station pumps and controls shall be <br />salvaged to the Owner. <br />9. Stormwater Conveyance During Construction <br />a. Existing stormwater is conveyed by the Swale Pump Station to Lift Station 6 to <br />be treated as combined sewage. Conveyance of stormwater to Lift Station 6 <br />and/or Lift Station 7 is to remain during construction until Lift Station 46 is <br />commissioned and able to fully replace Lift Station 6. Stormwater runoff must <br />not leave the site other than by conveyance to existing or proposed sanitary <br />sewer systems and per any limitations and requirement of the Stormwater <br />NPDES General Permit for the project.