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r <br /> CITY OF EVERETT EXHIBIT A-2 ADDENDUM TO SCOPE OF WORK J <br /> Exhibit A-2 <br /> Addendum to Scope of Work <br /> Final Design Modifications <br /> South Effluent Pump Station & Crosstown Pipeline <br /> Everett, Washington <br /> Introduction <br /> Modifications to the Final Design scope and budget are necessary due to a variety of <br /> reasons: <br /> 1. City staff has requested an evaluation of alternatives for the electrical equipment <br /> enclosure at the pump station. Three alternatives will be considered: installing the <br /> electrical equipment in a separate building,installing the equipment in a building as <br /> part of the pump station,and installing the equipment in appropriate NEMA rated <br /> enclosures for outdoor service. <br /> 2. Design of the pump station progressed to the 30 percent stage assuming that the pump <br /> station will be a separate,stand-alone, structure. Due to the higher than anticipated <br /> costs for the separate structure, the City has requested re-evaluation of the Alternative <br /> #4 layout as presented in the Alternatives Evaluation Report dated October 2001. The <br /> Alternative#4 layout shows pumps installed within the existing Chlorine Contact <br /> Channel (CCC). This alternative avoids the need to drive piles,excavate a wet well, and <br /> construct a separate concrete structure. The City Building Department has stated that <br /> they will not require the existing CCC to be revised to meet the requirements of the 1997 <br /> Uniform Building Code. A letter from the City Building Department dated August 15, <br /> 2002 is included as Attachment 1. <br /> 3. City staff has requested that an alternative pipeline alignment be evaluated on the west <br /> side of Everett. The alternative alignment would follow Grand Ave and 26th Street <br /> rather than West Marine View Drive. Although the alternative route is longer than the <br /> route along West Marine View Drive, the alternative route would have less impact on <br /> traffic. <br /> 4. City staff has requested evaluation of the existing river diffuser capacity. <br /> 5. During inspection of the existing river crossing,damage to a CSO manhole adjacent to <br /> the river was noted. Repairs to the riprap adjacent to the river are also required. The <br /> design effort will include preparation of drawings showing how the manhole and riprap <br /> will be repaired. The specifications and cost estimate will include these additional work <br /> items. <br /> J r' <br /> EXHIBIT A-2 REVISED SEPT 20.DOC 1 OF 5 <br />