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

ATTACHMENT A TO SECTION 01900 REVISIONS TQ THE STANDARD PLANS AND SPECIFICATIONS Trenches shall be conslructed to the depths, widths, and grades shown in the Plans and in the Cily ot Everefl Standard Drawings. Backfilling Section 7-08.3(3) is supplemented with ihe following: Meet the requiremenis of City oi Evereit Standard Drawings 316 and 610, 611, 615 and Section 3-95 of the City of Everett Desiyn and Construction Standards and Specifications. Backfilling shall be performed only after inspection and approval oi the installed pipe. Excavated uncontaminated material free irom mud, clay, muck, organic matter, and broken pavement shall be used for back(ill, except where otherwise required by the Resident Engineer. Backfill shall be excavated material placed in the remainder of the trench above the bedding and Aine zona material, except where otherwise required by Standard Drawing 610, or by the Residsnt Engineer. Backtill shalt be placed in horizontal liits and each litt mechanically compacted by a power-operated mechanical tamper(s) as specified in Section 2-03.3(14jC or other mechanical compaction device approved by the Resident Engineer. The Cor.tractor shall take any necessar� steps to protect ihe excavated material irom beco.ming comaminated with moisture. If there is an excess oi backfill material obtained from trench excavation at one location on lhe project, it shall be used at other locations on ihe project or disposed ot at an approved disposal site. If native material is not suitable tor use as backfill, gravel borrow coniorming to Section 9- 03.14(1) of the Standard Specifications shall be used, as required by the Resident Engineer, for trench backfill. Controlled Density Fill Conirolled density fill shall be used in lieu of s;lect irench backtill tor fill above pipe zone at all street crossings and other areas, as directed by the Resident Engineer, v�here high density backfill is required to prevent settlement of roadway pavement patches. Controlled density till shall be a mixture o( cement, fIy ash, fine aggregate and water which has been batchedin accordance with Section 2•09.3(1)E. Abandoned/Removed Pipe Where shown in the Plans, existing sanitary sewer and storm drainage pipe shall be removed, or plugged and sealed with controlled density fill and abandoned in place. WATER MAINS Construction Requirements Trench Excavation Section 7-09.3(7) is supplemented witli the iollowing: Recent work in the project area indicates significant amounts oi perched water may be encountered, depending on the lype ot soil in the localized work area. Where water is encountered in the trench, it shall be removed during pipe-laying operations and ihe trench so maintained until ihe ends ot ihe pipe are sealed and provisions are made to Capital Projects Commuter Rail Attachment A to Section 01900 - 19 IFB No. RTA/CP 21-06 � Everett Station Phase 2REVISIONS TO THE STANDARD PLANS AND SPECIFICATIONSAddendum No.4