Road Construction Northwest Inc 12/31/2019

CITY OF EVERETT SPECIAL PROVISIONS ' 1 2-09.3 Construction Requirements 2-09.3(1) General Requirements 1 2-09.3(1)C Removal of Unstable Base Material Delete all paragraphs in 2-09.3(1)C and substitute the following: When the material at the bottom of an excavation is not stable enough to support the Structure, the Contractor shall excavate below grade to the depth required by the Engineer and replace the unstable material with Foundation Material Class A or B. Place Foundation Material Class A or B in layers not more than six inches thick and compact to minimum of 90-percent maximum density as determined by 2- 03.3(14)D. Dispose of unsuitable material removed to make room for foundation material by hauling to a waste site obtained and provided by the Contractor in accordance with 2-03.3(7)C. 2-09.3(1)D Disposal of Excavated Material Delete the second paragraph in 2-09.3(1)D and substitute the following: All costs for disposing of excavated material, whether within the Project limits or hauled to a disposal site, shall be incidental to the other Bid items in the Proposal. The City will not pay for hauling. Disposal of excavated material shall meet the requirements of 2-03.3(7)C. 2-09.3(1)E Backfilling Delete the fourth paragraph in 2-09.3(1)E and substitute the following: , Provide CDF having minimum 28-day strength of 50 psi and maximum 28-day strength not to exceed 300-psi. Provide wet or flowable CDF with consistency having approximate slump between three to ten inches. I Controlled Density Fill used for excavation backfill may be placed dry or wet. Use wet, or flowable, CDF for filling abandoned pipes in-place. Supplement 2-09.3(1)E by adding the following: Where CDF is used in lieu of other materials such as foundation material, gravel borrow, washed sand or crushed surfacing top course, the respective limits for trench width or backfill dimensions shall be approved by the Inspector. 2-09.3(3)B Excavation Using Open Pits— Extra Excavation Revise the sixth paragraph to read as follows: Submittals and Design Requirements—The Contractor shall submit Type 3E Working Drawings with supporting calculations showing the geometry and construction sequencing of the proposed excavation slopes. 2-09.3(3)D Shoring and Cofferdams Revise the fifth paragraph to read as follows: Submittals and Design Requirements—The Contractor shall submit Type 3E Working Drawings with supporting calculations showing the proposed methods and construction details of structural shoring or cofferdams in accordance with Sections 1-05.3 and 6-02.3(16). ' 2-09.4 Measurement Delete all paragraphs in 2-09.4 and substitute the following: Water Main Improvement"U" Division 2—EARTHWORK October 1, 2019 WO No.—UP3698 SP—138 1