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O R A N G E C 0 U N T Y <br />BOARD OF COMMISSIONERS <br />ACTION AGENDA ITEM ABSTRACT <br />Meeting Date: August 3, 1992 <br />Action Agend <br />Item # ff--ice <br />SUBJECT: Sewer Easement Agreement <br />�. <br />with Hillsborough <br />DEPARTMENT: County Manager PUBLIC HEARING: Yes X No <br />ATTACHMENT(S): <br />Easement Agreement and Plat <br />INFORMATION CONTACT: County Engineer <br />TELEPHONE NUMBERS: <br />Hillsborough - 732 -8181 <br />Durham - 688 -7331 <br />Mebane - 227 -2031 <br />Chapel Hill - 967 - 9251/968 -4501 <br />PURPOSE: To present a proposed sewer easement agreement to the Board of <br />County Commissioners for its approval and execution <br />BACKGROUND: For some years, the Town of Hillsborough has had problems <br />with sanitary sewer manholes overflowing, during and after <br />heavy rainstorms, in the'.section of its gravity sewer <br />system near the County's Tax and Records Building. The <br />overflows have resulted from two distinct problems with <br />Hillsborough's gravity sewer collection system. One <br />problem is that the advanced age of many portions of the <br />collection system has resulted in large quantities of <br />infiltration and inflow (I & I) of stormwater being taken <br />into the system. During storms. cross - connections between <br />storm sewers, roof drains, etc., and sanitary sewers have <br />allowed a great deal of water to enter the sewer system <br />(inflow). During wet periods, the subsurface water rises <br />and leaks into the sanitary sewers through cracks and loose <br />joints in the pipes and manholes (infiltration). The . <br />second problem is that at least this section of the Town's <br />sewer collection system is currently flowing at full <br />capacity under normal conditions. The extra flow which <br />occurs as a result of I & I overloads the sewer pipes to <br />the extent that much of the excess flow escapes at manholes <br />in the lower elevation portion of the problematic section <br />of the sewer system. Currently after heavy rainfall, a <br />combination of stormwater and sewerage often sprays out of <br />the manhole located on the west side of Stillhouse Creek <br />directly behind the Tax and Records Building. <br />1 <br />