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Contract #99H235 Amendment #3 EXHIBIT ` 11 4" — REVISED STATEMENT OF WORK INDIAN RIVER COUNTY EAST ROSELAND AREA STORMWATER IMPROVEMENT PROJECT I. Introduction The project will construct a stormwater detention pond (control water surface area = 1 . 51 acres , more or less ) , install enlarged culverts , and construct stormwater conveyance swales to relieve flooding and reduce pollutant loading to the St . Sebastian River and the Indian River Lagoon (IRL) . The drainage improvements will also enhance the existing natural drainage system , which includes approximately 9 . 7 acres of wetlands . II. Objectives The East Roseland Area Stormwater Improvement Project will provide flood control and stormwater quality treatment for an 80 . 3 - acre watershed of Roseland lying east of the Florida East Coast Railroad , west of commercial development abutting the west right- of-way of U . S . Highway 1 , and between 81st Avenue and 79th Avenue , in Section 21 of the Fleming Grant in Indian River County . The project lies within the South Central IRL Drainage Basin , St . Johns River Water Management District Planning Unit 10E ( 16 & 17) . (Reference : SJRWMD Technical Publication SJ97 - 1 . ) This basin experiences frequent flooding due to filling of low areas and inadequate culvert capacity as a result of development over the past several years . When a large rain event occurs , a natural drainage slough fills with stormwater runoff, impeding upstream drainage and causing streets to flood . Nuisance flooding and road access problems due to flooding are common . The project includes the construction of a stormwater detention pond (control water surface area = 65 ,760 sf = 1 . 51 acres , more or less ) , installation of enlarged culverts , and construction of stormwater conveyance swales . III . Scope The project ' s goal is to relieve flooding and reduce pollutant loadings to the St . Sebastian River and the IRL . The IRL downstream of this project is exhibiting signs that water quality problems are developing . These signs include reductions in seagrass density and coverage , and increasing closures of shellfish harvesting areas or reclassification of shellfish . The creation of additional flood storage in the wet detention pond will improve the quality of discharge water into the St . Sebastian River via the approximately 1 , 100 foot long natural slough . This will result in improved water quality through reduced loadings of solids , sediments , organic matter, and nutrients into the St . Sebastian River and the IRL . Page 3 of 5