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12. The Contractor shall provide proving rings to check the mandrel. Drawings of mandrels <br /> with complete dimensions shall be furnished by the Contractor to the City upon request <br /> for each diameter and specification of pipe. <br /> 13. Bypass pumping required to complete the work shall be discharged to the nearest existing <br /> sanitary sewer or as directed by the Owner. The sanitary sewer bypass pumping work <br /> item shall include all labor, equipment and materials as required to maintain continuous <br /> service of the existing sanitary sewer system. The bypass pumping system shall operate <br /> such that surcharging and backups of the existing system does not occur. <br /> 20 <br />