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City of Everett 01 11 00 - 8 <br />Port Gardner Storage Facility – Facility Construction Package WO# UP-3525 <br /> <br />01 11 00 - 8 SUMMARY OF WORK <br />Category 2: Sensitive information <br />Category 2: For official use only / disclosure permissible by law. <br />b) Process Mechanical <br />1. Routing of the 48-inch and 18-inch diameter stormwater <br />pipelines within the diversion structure vault. The 48-inch <br />diameter line includes two gate valves and a take down <br />coupling. The 18-inch diameter line includes installation of a <br />magnetic flow meter, knife gate valve, and modulating plug <br />valve. <br />c) Instrumentation and Controls <br />1. Installation and integration of the following Area 40 <br />instruments/equipment into the site control system. <br />i. Magnetic flow meter <br />ii. Valve actuators <br />d) Site Civil <br />1. Regrading and paving around the stormwater diversion <br />structure. <br />2) Construction of the stormwater treatment system includes <br />establishing an approximately 11,000 square foot basin for housing <br />a manufacturer supplied stormwater treatment system consisting of <br />media as specified in Section 33 46 59. This work requires building <br />a new pile supported structure around residual structural elements <br />from the selectively demolished pump station building. The <br />stormwater treatment system includes structural, process <br />mechanical, and civil elements: <br />a) Structural <br />1. Construction of a concrete subgrade basin. This structure <br />will include approximately 4,500 square feet of an existing <br />foundation and 6,500 square feet of a new pile supported <br />structure. The invert of this basin will sit approximately 7-feet <br />below grade. The top of wall will sit approximately 1.5-feet <br />above grade. <br />2. Installation of channeling within the basin structure for <br />routing flows and housing treatment media. <br />b) Process Mechanical <br />1. Connection of an 18-inch diameter stormwater pipe from the <br />Area 40 Diversion Structure to the stormwater treatment <br />system influent channel. <br />2. Installation of perforated collection piping within each of the <br />basin channels that will contain treatment media. These <br />pipelines will collect treated stormwater and convey the flow <br />to the downstream collection header. <br />3. Installation of a collection header on the western facing <br />exterior wall of the treatment system. Flow from each <br />individual treatment channel will be routed to this collection <br />header which will convey flow to the CSMH-60-01, upstream <br />of the Area 60 Effluent Pump Station.