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s 40 r W. Christopher J. Kafer, P.E. Addendum #4 08/23/00 Page 2 into the new 30 acre stormwater basin. We will prepare a model which will incorporate the runoff from an expanded drainage area as described above, the resultant effect on the proposed 30 acre stormwater basin. the design considerations with respect to the discharge structure and the impact with respect to the downstream stormwater system which has been designed for CR 512 Improvement project will be evaluated. The Feasibility Report will be prepared and include an exhibit at 2,000 scale showing the shape and size of the contributing drainage area with respect to the proposed 30 acre stormwater basin. Other sketches, exhibits and stormwater modeling information will be included to supplement written material. The Feasibility Study will also include a brief narrative describing and discussing our findings as well as recommendations and conclusions. Services for design and permitting are not included. We anticipate the specific Scope of Services to be as follows: Scone ofSerpices 1. Consult with County Staff to clarify and define requirements for the project. 2. Coordination with County Staff to acquire and review all previous studies, plans, and permits pertaining to the project. This would include all past stormwater design data for original industrial park and three (3) industry sites located in the park. It is assumed that County Staff can produce the data. 3. Investigate to obtain additional information recommended to identify existing conditions (using soil survey maps to determine soil characteristics and depth to water table). 4. Field survey and obtain three (3) cross sections at 200' intervals of two (2) existing canals east of 102 Terrace. These are the canals to be filled in by FDEP. Also, field survey to determine size and location of pipes crossing under 102nd Terrace. 5. Conduct field investigation if necessary to supplement available data. 6. Identify and analyze existing conditions of upstream contributing drainage area of approximately 2,160 acres based on available data; and develop hydrologic and hydraulic model to estimate existing conditions. 7. Develop hydrologic and hydraulic model of the proposed stormwater basin expansion (to 30 acres) with approximately 2,160 acres upstream contributing drainage area in order to identify potential upstream and downstream impacts. 8. Review findings with County Staff. 9. Prepare a report containing findings and recommendations, including appropriate exhibits to supplement written material. 10. Coordination with County Staff to finalize report incorporating client's comments. 1W