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Exhibit A Indian River County 8t" Street Parcel Scope of Work August 3, 2022 Background ATKIN5 Canals within the region are regulated by the Indian River Farms Water Control District (IRFWCD). The canal system of the IRFWCD was constructed to drain standing water and "reclaim" what was considered wastelands of Florida. The original constructors considered the canal installations a benefit to commerce and the environmental impact was not considered at that time. Impacts to the Indian River Lagoon (IRL) were primarily from agricultural practices until about 1950 when urbanization increased dramatically, as did the impact of urban development on the IRL. In the mid -1990's, it was determined that the IRFWCD canal system receives and transports nutrients, suspended solids, light -attenuating materials, and excessive freshwater flows that have reduced seagrass coverage and impacted the IRL ecosystem. Based on work by SJRWMD, the recent focus of water quality improvement in the IRL has been directed towards the reduction of "optical parameters" that restrict the light into the water column. Optical parameters of importance include suspended solids, turbidity, and color. Nutrients are considered to be secondary optical parameters because high nutrient levels lead to algal production which causes an increase in turbidity. Scope of Services Indian River County (County) is seeking to improve water quality discharges into the IRL by converting a 40 -acre historical agricultural parcel into a stormwater storage facility. The 8th Street Parcel is located at the southeast corner of 8th Street and 74th Avenue, west of the City of Vero Beach approximately 2,000 feet north of the Egret Marsh Stormwater Treatment Facility along the Lateral C Canal. The County maintains a current stormwater management plan and administers a robust water quality monitoring program throughout the County limits. Specific to this project, the County collects water quality samples in the Lateral C Canal adjacent to the 8th Street parcel. Current water quality sampling results show relatively low values of TN and TP in the canal. This may be due to the water quality improvements generated by the upstream Egret Marsh Stormwater Treatment Facility, which treats a portion of the Lateral C canal flows, or from reduced rainfall and runoff during the limited sampling period, or a combination of both. The design approach will be to extract water from the Lateral C Canal for storage in a proposed pond that will reduce nutrients through natural uptake or potentially filter media. The pond may also be used to decrease pulsed discharges of stormwater into the lagoon during periods of heavy rainfall through active management of water levels in the pond. Extraction of water from the Lateral C will be accomplished using a pump station. I RC_8th_StreetParcel_Scope_ATKI NS.docx