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<br />:1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />II <br />I <br />I I <br />I <br /> <br />· Land development in the Tri- Town Basin will be required to limit the stormwater <br />runoff for the area located north of WCR 18 to the magnitude of the existing <br />condition, lO-year and 100-year flood event. For that portion of the Tri- Town <br />Basin located south of WCR 18, stormwater runoff should be limited to the <br />magnitude of the existing condition, 2-year flood event. <br /> <br />· . Releases from land development in each subbasin will be conveyed in a safe and <br />stable manner to the major drainageway. This statement implies that stormwater <br />runoff will be conveyed in an appropriate outfall facility such as a channel, storm <br />sewer, etc. <br /> <br />· All existing railroadfroadway detention ponds previously discussed must remain <br />intact or be replaced. <br /> <br />5.4 Cost Estimates <br /> <br />Estimates of the costs were developed for the proposed improvements and provided the <br />basis for the opinion of costs generated for the comprehensive plans for each basin. Data used to <br />develop unit costs were obtained from bid tabulations, quotations from various suppliers and <br />manufacturers, and information supplied by local contractors and city utility departments. The <br />unit pricing data compiled and used to generate the cost estimates is provided in Appendix C. The <br />cost estimates for the comprehensive plans included the following categories: (a) general drainage <br />infrastructure; and (b) engineering, permitting, legal, fiscal and administrative costs. <br />General drainage infrastructure costs are defined as the costs associated with the labor and <br />materials for the drainage improvements as well as the drainage ROWieasements or land <br />acquisition for the construction and maintenance of the drainage improvements. A contingency, <br />of 35 % was included in the estimate of construction costs to include those real and intangible items <br />not directly accounted for in the unit pricing data and the costs associated with mobilization, utility <br />relocation, bonds, and insurance for the contractor. <br />The flIlal cost category was estimated to be approximately 20 % of total construction costs. <br />This category is intended to include professional engineering and construction services, labor <br />required to obtain the necessary permits, and legal requirements. Administrative costs relate to <br />the implementation of the construction plan by the various governmental agencies. <br />The cost estimates for the comprehensive plans are presented in Tables 5.1 and 5.2. <br /> <br />T:\OPEMCoweldOllcoweldOI fill rpt.wpd <br /> <br />5.30 <br /> <br />September 8, /999 <br />