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.~ Plan of Study for City of North Olmsted Phase I by Floyd Browne Group January 4, 2006 RESIDENTIAL HOME INSPECTIONS AND SANITARY SEWER EVALUATION LeBern Pump Station Service Area Overview The LeBern Pump Station Service Area is located north of Lorain Road and bounded on the east by Fairview Park, on the north by Westlake, and on the west by Columbia Road (see Exhibit 1). Within this service area, there are approximately 2,150 homes, 5-6 businesses, and two schools. Based on the Ohio EPA Flow Guide, the estimated residential equivalent units (REUs) are 2,200. An REU can be defined as the normal amount of wastewater flow expected to be discharged from a single family home on an average day. The Ohio EPA Flow Guide states that this amount is 400 gallons per day. Businesses, schools, and other institutions are rated on this same system as equivalent units. Two (2) trunk sewers with one on Clague Road and one (1) on Walter Road serve this area. The ground generally slopes north from Lorain Road at elevation 750 to the LeBern Pump Station at elevation 730; however, there are many flat areas that are poorly drained such as Deerfield Estates and Maple Ridge. The soils in the area are classified as poorly drained as detailed in the section on the storm sewer system. The sanitary sewer records indicate that a layer of shale exists approximately 5-10 feet deep and a layer of rock at 15-20 feet deep throughout the area. The local sanitary sewers have been installed above the rock in most areas, but the collector lines and the trunks have been laid in or just above the rock layer. Larger diameter pipes at minimum grades have been constructed to provide the necessary design capacity for the system. On many streets, stacks have been installed to permit the homeowners to tie into the system above the shale layer. The homes in the LeBern Service Area were generally built in the 1950's and `60's when connecting foundation drains to the sanitary sewer was widespread and common practice. There are a variety of home styles such as ones built on slabs or crawl spaces, split levels, and full basements. The reason for these different designs may be due to the level of the rock or sanitary sewer on each particular street. These differences required the study team to investigate different types of homes in the area asking the question: "Why did this one experience flooding and this one did not?" The residential home surveys were obtained over the phone, by going house to house, and by mail. The study team attempted to contact a random group of residents throughout the area with a special focus on those who had experienced some sort of flooding during the August 20, 2005 storm event. However, the team wanted to have some idea of why certain homes in a particular area did not flood. A letter from the Mayor (see Exhibit 2) was distributed explaining the study, and a questionnaire (see Exhibit 3) was filled out on each property including observations around the home and in the basements. Exhibit 4 shows a typical house schematic that visually displays the down spout drains, foundation drains, sanitary sewer lateral, and sump pump discharge in relationship to the house and the main line sewers in the street. Copies of the surveys are included in Appendix A and a summary of the results is shown in 9