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I <br /> valves. The segment numbers refer to the project number during installation and <br /> have no operational value. <br /> Q2 - In Segment 4 it appears that there are valves between Segment 3 &4 (at STA <br /> 157+04.00) and Segment 4 & 5 (at STA 203+15.00). Are we to assume that the City <br /> will close these prior to Segment 4 pipeline repairs? Is the integrity of these valves <br /> sufficient to isolate Segment 4 during the repair period? <br /> For this project, the City will isolate the entirety of the pipeline from Segment 1S to <br /> 4 by turning two valves on each side of the project area. The pipeline section <br /> between these two valves will be de-headed. <br /> Q3 - What safety measures will the City implement to protect our workers against the <br /> introduction of water into the pipeline during the repair work? <br /> City staff will provide double block and pleed energy isolation techniques for <br /> sections of pipe in which workers must enter. When or if this method is not <br /> feasible, a single block method in combination with an early warning system <br /> comprising of City staff monitoring effectively researched locations to ensure entry <br /> team is afforded timely evacuation should engulfment potential present. City staff <br /> ' will perform group lockout tagout activities through valving operations and the <br /> application of safety locks and tags to identified components. The City will provide <br /> direct contact communications to persons in charge of the aforementioned. These <br /> methodologies require extensive conversation with competent persons from <br /> interested parties to ensure clarity and should be considered as a support <br /> mechanism of the contractor's requirement to protect their own employees. <br /> Q4- It is customary for the pipeline operator to be responsible for the safe disposal of <br /> any pipeline contents. Will the City be draining the contents of the pipeline <br /> segments 1N &4 prior to granting the Contractor clearance to begin work? <br /> The City's typical practice is to de-head the pipeline and then the contract can <br /> dewater further so that they can accomplish their work. City staff will be available <br /> to oversee the Contractor's dichlorination and dewatering activities before the <br /> work begins, as well as the Contractor's flushing and disinfecting after work is <br /> completed. <br /> r <br /> Q5- Specification 036000 2.2 specifies the Mortar Binding Agent to be Dayton Superior <br /> ProAnchor Elite. Upon review of the vendor literature, we believe that this is the <br /> wrong product as it is a cartridge-based system for the anchorage of dowels, bolts, <br /> reinforcing steel and threaded rods. Please provide a product that is suitable for <br /> bonding grout to steel pipe wall and existing concrete. <br /> Addendum 1 Page 3 <br /> CITY OF EVERETT• 3200 Cedar Street• Everett, WA 98201 • (425) 257-8800• Fax (425) 257-8882 <br />