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3 <br /> Project: <br /> Change Order: 8 <br /> Change Order Effective Date: July 5,2006 <br /> Exhibit A—Description of Changed Work <br /> In 2002,the City and Synagro entered into a multi year, Biosolids and Backwash Solids <br /> Removal Project. Phase 1 and Phase 2 have been completed and this year's Biosolids <br /> and Backwash Solids removals are the final Phase (Phase 3)of operations in this <br /> Contract. <br /> A. The City has recently created a new biosolids handling pad in the oxidation pond at <br /> the WPCF. This biosolids handling pad is approximately 900 feet from the biosolids <br /> handling pad previously used for Phase 1 and 2 of this Contract. This change in pad <br /> location has created a significant change in operating conditions for the biosolids removal <br /> portion of Phase 3 of the Contract. <br /> Due to these changes in operating conditions the parties agree that the additional items, <br /> detailed below, will be needed to complete the Biosolids Removal portion of this <br /> Contract. <br /> 1. Steel trench plates are needed to assure vibration from biosolids dewatering <br /> equipment,i.e. centrifuges,does not adversely impact the gravel surface of the <br /> biosolids handling pad. In Phases 1 and 2 of this Contract,dewatering operations <br /> were performed on an asphalt pad. <br /> The cost associated with this item is $7,014.60 and includes all costs associated <br /> with rental, delivery, installation and removal of 16 plates. <br /> 2. Centrate from dewatering equipment must be returned to Aeration Cell 1 through <br /> a return sewer line installed as an appurtenance to the biosolids handling pad. In <br /> Phases 1 and 2 of this Contract,dewatering operations occurred immediately <br /> adjacent to Aeration Cell 1 and pumping of centrate was not required. <br /> The cost associated with this item is $13,688.71 and provides for the rental, <br /> delivery, installation, and removal of a 9000 gallon baker tank(centrate storage), <br /> submersible pump and associated wiring. <br /> 3. A waste sludge line.was recently removed from Aeration Cell 2 and biosolids in <br /> this area can now be removed. <br /> A grinder pump is necessary to protect dewatering equipment and assure <br /> incidental material,such as wood or plastics that accumulated behind the waste <br /> sludge line,does not plug the primary sewer line that transfers biosolids to the <br /> new pad for dewatering. <br /> The cost associated with this item is$12,275.55 and includes delivery, <br /> installation, and removal of the grinder pump. <br /> 18 <br /> Exhibit A <br /> Page 3 of 4 <br />