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JonesEdmundsl Integrity • Knowledge * Service February 14, 2023 Laura Yonkers, PE, CFM IvonkersCabircoov.com Indian River County Engineering - Stormwater Division 1801 27th Street, Building A Vero Beach, FL 32960 RE: Exhibit A - Scope of Work Work Order No. 3 for Egret Marsh Headworks Professional Services Continuing Engineering Services Agreement (Amendment No. 1) Jones Edmunds Opportunity No. 95479-013-23 Dear Ms. Yonkers: Thank you for this opportunity to work with you and your colleagues on the Egret Marsh Headworks project. This Work Order will be completed in accordance with the Agreement for Continuing Engineering Services between Jones Edmunds & Associates, Inc. (CONSULTANT) and Indian River County (COUNTY) dated April 17, 2018, as renewed by Amendment No. 1 expiring April 16, 2023 (Agreement). BACKGROUND The COUNTY has two stormwater treatment systems that use an Algal Turf Scrubber (ATS) to remove nutrients: Egret Marsh Stormwater Park and Osprey Marsh Wetlands. This project is proposed to replace the distribution header pipe on the ATS for the Egret Marsh Stormwater Park. The current Egret Marsh ATS system allows water to flow from the headworks by gravity to a tee and then split the flow to two buried distribution manifolds. Each distribution manifold is approximately 168 linear feet and is shown on the plans to reduce in size from 36 -inch high-density polyethylene (HDPE) to 18 -inch HDPE, to 12 -inch HDPE, to 10 -inch HDPE, and ultimately to 8 -inch HDPE. Each manifold connects to 57 laterals that increase in size from 4 -inch HDPE to 6 -inch HDPE, to 8 -inch HDPE (see attached design drawings C -5A and C -5B). The lateral transitions from HDPE to PVC piping. Each lateral terminates with a Valterra PVC knife gate. The COUNTY noted that the current distribution manifold is leaking water. The ATS concrete slab may also be leaking, and the concrete joints may need to be resealed. The operation and maintenance of the current manifold system can be laborious given the number of valved laterals and their locations underground. The COUNTY would like to replace the distribution manifold system with an improved aboveground system that 800.237.1053 1 JONESEDMUNDS.COM