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Page 2 <br />City of North Olmsted <br />Attn: Mr. Ralph Bohlmann, <br />Service Director <br />I. SCOPE OF SERVICES <br />January 19, 1996 <br />The W.R.E.S. Corporation (AKA The Western Reserve Engineering & Surveying <br />Company) will perform a comprehensive drainage study of the drainage system which affects <br />the West Park/Forest Ridge Subdivision. <br />The analysis will be performed using the Stormwater Management Model (SWMM), <br />which is a computer model developed by the EPA to analyze closed conduit systems. <br />The existing system will be input into the model using existing plans of the area. Site <br />inspections will be made as necessary to verify the components of the system. A 50 year rainfall <br />frequency will be used to generate the runoff into the system. The volume runoff is dependent <br />on land use and drainage paths. All tributary areas to the system will be included in the analysis <br />of the runoff. <br />Based on the modeling of the storm sewer system, recommendation will be made on how <br />to improve the system to the point where the system does not surcharge back into the residential <br />structures from flows from the design storm. <br />The alternatives which will be evaluated will be: <br />a) Larger storm sewers to convey the flow <br />b) Surface detention <br />c) Underground detention <br />d) Combination of the above <br />The DeGroot report will be used as a basis for the study. The recommendations of the <br />DeGroot report will be used as a starting point only and will be expounded upon. <br />Construction cost estimates will be developed for the various alternatives so the City of <br />North Olmsted can evaluate the systems on cost - benefit terms. <br />The report will include hydraulic grade line profile drawings of the existing and proposed <br />system. Ten copies of the report will be supplied to the City.