Earthworks Solutions, LLC 5/3/2024

CITY OF EVERETT SPECIAL PROVISIONS Water Main Replacement “Y” – Ph 1 Div 2 – EARTHWORK March 2024 Work Order No. UP 3814 SP-155 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). Supplement 2-09.3 by adding the following: 2-09.3(5) Optical Survey Monitoring Program A detailed survey and monitoring program should be implemented prior to and during construction at Madrona Ave site, location as identified per Plans. This would include: Preconstruction Survey A preconstruction survey of the adjacent curbs, buildings, and utilities should be performed prior to commencing construction. The preconstruction survey should include a video or photographic survey of the condition of existing improvements to establish the preconstruction condition, with special attention to existing cracks and observed settlement in streets or buildings. Optical Survey An optical survey monitoring program should be implemented during construction. The baseline survey should be completed prior to any pavement removal or excavations. The recommended frequency of monitoring should vary as a function of construction activity and monitoring performance. Monitoring frequency is listed below. Construction Stage Monitoring Frequency During pavement removal, excavation and backfill Three times per week Following final paving One final reading Monitoring should include vertical and horizontal survey measurements accurate to at least 0.01 feet. A baseline reading of the monitoring points should be completed prior to beginning excavation and prior to any site demolition. Minimum optical survey points shall be established along Madrona Avenue as follows: • At the curb lines or adjacent sidewalk at roughly 100 ft spacing (between Sta. 23+00 to Sta. 31+00) • Three or four points on the top of the existing concrete retaining wall (location per plan) • On/near adjacent buildings if current settlement/movement is observed, as appropriate. Contractor shall establish baseline readings of the monitoring points and use this to update with additional reading for each survey measurement. The monitoring results should be present in a comparison format to previous readings. The Contractor shall provide the engineer a copy of the survey monitoring results on the same work the survey reading was taken.