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. ? . , <br />1.4 Analyze existing environmental conditions, utilizing <br />to the maximum extent data developed in other studies. <br />1.5 Perform infiltration/inflow (I/I) analysis to <br />demonstrate the non-existence or possible existence of <br />excessive I/I within the collection system. The I/I analysis <br />shall consist of the following tasks performed for the North <br />Olmsted and Olmsted Township portion of the study area. It <br />is understood that a segmental I/I analysis will be performed <br />for the Fairview Park portion by the City Engineer for <br />Fairview Park. 1.5.1 Obtain existing sewer maps and combine into a <br />single system map. <br />1.5.2 Conduct interviews with persons knowledgeable with <br />the sewer system to verify the condition of the sewers and <br />the completeness of the sewer maps. <br />1.5.3 Obtain and tabulate existing data on lengths, <br />materials of construction, age and condition of the sewers. <br />1.5.4 Make a <br />service area and <br />be compared with <br />1.5.5 Locate <br />sewer system and <br />overf low. <br />study of water consumption in the sewer <br />develop water use patterns. This data will <br />flow gauging data. <br />from available information overflows in the <br />estimate the frequency and volume of each <br />1.5.6 Divide the sewer system area into a maximum of <br />twenty (20) mini-systems and install flow gauges in the key <br />manhole for each system. The gauges will be installed for a <br />period of time to gather reliable data and will include a <br />rainfall event sufficient to determine I/I. <br />1.5.7 Using the information developed above, prepare <br />estimates of the following: <br />.1 Average Annual Infiltration (million gallons). <br />.2 Average Annual Inflow (million_gallons). <br />,3 Peak Infiltration Rate (mgd). <br />. 4 Peak Inf low Rate (mgd). <br />,5 Peak Infiltration Rate (gpd/in. dia.-mi.). <br />,6 Peak Inflow Rate (gpd/in. dia.-mi.). <br />-2-