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r .. ~..... ,.. Plan of Study for City of North Olmsted Phase I by Floyd Browne Group January 4, 2006 Table 1. The residents of North Olmsted were very helpful and cooperative in obtaining this information. They are very interested in getting the problems identified and repaired. Residential Inspections The residential inspections were very helpful and revealing. Some homes were originally on a septic system that was later abandoned into the sanitary sewer in the late 1960s. Many of the residents do not know where their foundation drains connect. During the August 20`h storm (see Appendix D), flooding occurred in many areas, but in this report, we have tried to focus on the areas where a large number of people were flooded. There are some isolated cases that should be investigated on an individual basis to determine the specific problem such as a clogged lateral, lowest house in the area, etc. Each home should have both a storm lateral and a sanitary lateral with cleanout tees near the street so that dye testing or internal televising of the lateral could easily be performed. In this study, we have tried to give an overview and summarize some of the major issues affecting the proper operation of the sanitary sewer system. Observations revealed that many foundation drains connect into the floor drains. The lowest floor elevations in most houses were below the level of the storm sewer system. On November 15, 2005 during a light rain (see Appendix D), sewer maintenance crews internally videotaped the sewer line on Doe Drive in Deerfield Estates showing that over 75% of the sanitary laterals were discharging a steady flow of relatively clean water. This is a good confirmation that many homes have foundation drains connected to the sanitary sewer. Some residents have water proofed the basements, replaced their foundation drains, and installed sump pumps to divert the ground water to the storm sewer system. However, since the sump pump discharge connections were made below ground, it could not be confirmed that the clean water was going to the storm sewer. Some dye testing should take place in the future to determine if these existing systems are properly connected. Some residents have installed battery backup systems on their sump pump in case of power outages. During the August 20`h storm, some sump pumps could not keep up with the flow entering the system. In this case, either the foundation drains are cross-connected with the sanitary sewer lateral or the sump pump is not large enough to handle the flow. The storm sewer system in the area is very shallow and cannot service the basement foundation drains without a sump pump. Many of the downspouts have been disconnected from below grade and use splash pads around the house foundation. Some sinkholes in the yards and around the foundations were observed and would indicate that storm water is getting into the foundation drains and then into the sanitary sewer. The downspouts for all of the homes in the area should be dye tested and repaired in order to convey the roof water to the storm water system. In discussions with the residents, there appears to be a recirculation of storm water when a sump pump is being utilized. There are numerous driveway drains, yard drains, and outside stairwell drains that were observed. The yard drains may connect to a shallow storm water system at the rear of some properties, but these should be dye tested to confirm the discharge location. Many of the drainage swales and shallow storm water pipes are not functioning properly due to landscaping, filling of low areas, and other obstructions thus causing flooding in some backyards. Due to the shallow rock layer this could be contributing to the footer drain flow especially during severe storm events and saturated soil conditions. The driveway and stairwell drains are below the 10