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r~. ._ _._.. _._,...~.~., ---.~11,q,,,,, ram„. w. Plan of Study for City of North Olmsted Phase I by Floyd Browne Group January 4, 2006 inflow through FDR drains on a daily basis. The two (2) trunk sewers have the capacity to deliver approximately 5 MGD to the pump station. Some by-pass pumping has occurred at the Dover Pump Station and on Blossom Blvd. during high intensity storms, but the pumps keep up with the ordinary wet weather flows if the pump station is operating properly. The pump station is being evaluated in a separate section within this report. Over the past twenty (20) years, the City of North Olmsted has made many improvements to its sanitary sewer system that is within the public right of way such as joint sealing, pipe replacement, and manhole rehabilitation. Manholes in low-lying areas that may be subject to flooding have been protected from inflow using a plastic manhole insert. In addition, many sanitary laterals have been inspected, grouted to repair leaks, or replaced. The mainline sanitary sewer system appears to be in good condition. In analyzing the capacity of this system, it is important to note that most of the pipe is laid at minimum grades with a few exceptions. The sanitary sewer system is adequate for normal flows, but the localized areas of basement flooding need to be investigated further to determine whether wastewater is backing up into the basements or if the storm water is overwhelming the foundation drains. Recommendations Some of the solutions and alternatives that should be studied further for feasibility and cost effectiveness are as follows: 1. Determine if the Dover Pump Station is operating properly and at maximum capacity. Some increase in pumping capacity should solve the problems on Blossom and Edgepark Blvd. 2. Go to the source of the inflow and eliminate foundation drains tied into the sanitary sewer system, repair the downspout drains, and 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. Investigate individual isolated cases to determine what can be done to alleviate the flooding. Conclusions The problems in the Dover Pump Station Service Area are not as severe as those in the LeBern area. Since localized storm water flooding is the major problem, some effort should be made to evaluate the areas of concern to determine cost effective solutions. After evaluating the pump station, increasing pumping capacity should resolve the main area of sanitary sewer surcharging. An evaluation of the downstream system needs to be done to determine how much capacity is available for the extra flow. 16