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Plan of Study for City of North Olmsted Phase I by Floyd Browne Group January 4, 2006 2. Part of this program should include going to the source of the inflow and eliminate foundation drains tied into the sanitary sewer system, repair the downspout drains, and redirect the yard drains by transporting this clean water to the storm sewer system. Improve the local drainage swale systems to eliminate water entering around the foundations and to prevent yard flooding. 3. The study should be initiated by assessing the older portions of the City where it is known that a high percentage of homes have foundation drains tied into the sanitary sewers and initiating a program of sump pump installation to rid the sanitary of storm influence through foundation drains. A cost analysis should be preformed to determine if this is the best option. Storm System: Model the main drainage artery in the LeBern area to find what result should be in a 100+-year storm and compare the result to the observations during the August 20, 2005 storm. The questions to be answered from this exercise are: a. Is the flow getting away to the storm collection system? b. Is the storm water showing a temporary high water table on top of the rock base and getting into the residential basements to be carried away by the foundation drains, yard drains, and sump pumps, which may be connected to the sanitary system. c. If the flow is not getting away and the water is gaining entrance to the sanitar~r system through foundation drains and sump pumps, this may be a major component to the sanitary sewer overflow situation in North Olmsted. It may also be an answer to some of the observations of high flows in the sanitary sewer with medium to low flows being observed in the storm sewers. 2. An evaluation of the local storm sewer collection and transport infrastructure should be performed. a. From the residential home inspection study, it appears that storm water collects around the home foundation and cannot find its way to the storm collection system. This water eventually finds its way into the sanitary sewers. b. There is evidence from interviews with the residents that the local storm drainage infrastructure has been damaged or removed by neighboring property owner's improvements. This makes local drainage difficult or impossible. 3. Any storm water study should also address public storm sewer improvements that will be required to keep pace with the new storm water flows from the residential areas if foundation drains and sump pump water is redirected to the storm sewers from the sanitary sewers. Sanitary: Evaluate and replace portions of the trunk sewer on Walter Road. This alternative will require the removal of clean water connections or additional storage.