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ORIGINAL. I PAGE NO <br />SUPPLEMENTAL AGREEMENT NUMBER 3 to <br />CONSULTANT AGREEMENT NUMBER 16-054(c) <br />PAGES <br />THIS SUPPLEMENTAL AGREEMENT is entered into between the City of Tukwila, <br />Washington, herein -after referred to as "the City", and RH2 Engineering, Inc. hereinafter <br />referred to as "the Consultant", in consideration of the mutual benefits, terms, and conditions <br />hereinafter specified. <br />The City desires to supplement the agreement entered into with the Consultant and executed <br />on, May 2, 2016 and identified as Agreement No. 16-054. All provisions in the basic agreement <br />remain in effect except as expressly modified by this supplement. <br />The changes to the agreement are described as follows: <br />Background <br />The purpose of this supplement is to add specifications to the bid package to allow for ultraviolet <br />(UV) cured -in-place pipe (CIPP) to be installed. In the past seven (7) months, contractors with <br />experience in the installation of UV CIPP have begun pursuing sewer pipeline restoration <br />projects in Washington and Oregon. This is advantageous for the City because contractors that <br />install the traditional felt CIPP have had an abundance of work in 2017. This has reduced <br />competition recently, which increases costs and has delayed completion of work for some <br />northwest agencies. Competition will be increased and more bids will be received if the City <br />allows UV CIPP in addition to traditional felt CIPP methods to be bid. <br />Below are the tasks necessary to modify the existing bid package to allow UV CIPP on this <br />project. <br />Task 1 — Technical Specifications for UV CIPP <br />Objective: Modify existing bidding documents and technical specifications to allow contractors <br />using UV CIPP to bid the project. <br />Approach: <br />1.1. Perform structural calculations to size UV -cured liner thickness for soil and traffic <br />loadings. UV CIPP has greater strength than felt CIPP and can be installed in thinner <br />layers to accomplish the same level of structural integrity. <br />1.2. Add text to the Technical Specifications describing the required physical characteristics, <br />codes, special installation methods, and other applicable items for the UV CIPP. <br />1.3. Edit bid schedule and pay descriptions to accommodate for traditional felt and UV CIPP. <br />RH2 Deliverables: <br />• Modifications to the Technical Specifications, bid schedule, and pay descriptions. <br />Time for Performance, the completion date of the work shall be January 31, 2018. <br />(W:Projects/04sw08/Supplmental Agreement 9 <br />APS) <br />af (6// <br />3 <br />