2400 33RD ST CONTRACT AGREEMENT 2016-01-01 MF Import

A7TACHMENT A TO SECTION'01900 REVISIONS TO THE STANDARD PLANS AND SPECIFICATIONS Rooi drain, tloor drain, and underdrain cleanouts shail be in accordance with City of Everett Standard Drawing No. 604. PRECAST CONCRETE STORM FILTER VAULT Description This work shall consisi oi designing, installing, completing, and grouting (watertight) of pre-cast reiniorced concrete storm water filter vault. Also included, but not limited to, is the furnishing and installation of all tilters and the hardware, pipe, tittings, and appurtenances to install the filters, installing the inlet ard outlef accesses, and furnishing and placing sub-base and gravel backfill material, as shown in the Plans and Details. The tacility shali be constructed in accordance with the approved shop drawings. The minimum design loads shall be in accordance with ASTM C 890 and AASHTO "Standard Specifications for Highway Bridges", HS-20. Submittals 1. Stormwater Manac�ement shall submit shop drawings sealed by a�iructural engineer licensed in the State o( Washinc�ton for approval by Resident Engineer. ?_. Stormwater Management shall submit an Operation and Maintenance Manual for use by the Owner in accordance with Section 01785. Materials 1. Internal Componenis Ail internal components including PVC manifold piping, iilter cartridge(s), filter media, flow spreader(s), and energy dissipator(s) shall be provided by Stormwater Management Inc., 12021-B NE Airport tNay, Portland, OR 97220 (B00/548-4667). 2. Filter Media: Filter media shall consist ot the (ollowing: CSF Leaf Media: CSF leaf inedia shall be made exclusively oi fallen deciduous leaves with less than 5% by dry weight of woody or green yard debris materials. Filter media shall be granular and shall contain less than 0.5% foreign material such as glass or plastic contaminanls. Media shall be dry at the time o( installation. The CSF leaf inedia shall have a bulk density ranging from 40 to 50 Ib/ft3 and particle sizes ranging from 0.05 to 0.50 inches. Maximum level of dust for tilter media shali be defined as: media passing through a US Standard Sieve t�4 shall have no more ihan 1 G% (by mass oi dry media) passing a US Standard Sieve #45. 3. Filter Cartridc�e Filter cartridge bottom pan, inner ring, and hood shali be constructed irom linear low-density polyethylene. Filter cariridge screen shall c��sist of galvanized 1" x Yz" welded wire fabric (16 gauge minimum) with a bonded Pb'C coa�ing. Internal parts shall consist of PVC or ABS pipe and filtings. Siphorrpriminp float shall b� con;tructed from linear luw-density polyethylene. Outer filter (abric shall be 10 x 8.5 clear (iberglass mesh. Inner (ilter isbric shall be 10 x 8.5 ciear fiberglass mesh over [nkamat 7210 or woven polyethylene with a US Standard Sieve #20 opening size. All miscellaneous nuts, bolts, screws, and other fasleners shall be aluminum or stainless steel. Capital Projects Commuter Rail Attachment A to Sectinn Q1900 - 25 IFB No. RTA/CP 21-06 � Everett Station Phase 2REVISIONS TO THE STANDARD PLANS AND SPECIFICATIONSAddendum No.4