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INDIAN RIVER COUNTY, FLORIDA DEPARTMENT OF UTILITY SERVICES Date: July 5, 2017 To: Jason E. Brown, County Administrator From: Vincent Burke, P.E., Director of Utility Services Prepared By: Arjuna Weragoda, P.E., Capital Projects Manager Subject: Countywide Septic to Sewer Conversion Evaluation/Ranking Report — Results DESCRIPTIONS AND CONDITIONS: On October 18, 2016, under Consent Agenda Item 8-G, the Indian River County Board of County Commissioners (BCC) authorized staff to proceed in the development of a more comprehensive septic to sewer (S2S) priority ranking plan along with cost estimates for platted subdivisions currently on septic. As part of that approval, the BCC approved Work Order No. 2 for Schulke, Bittle & Stoddard, LLC, (SBS) to provide professional engineering services for a comprehensive countywide S2S priority ranking study based upon various physical and environmental factors as well as construction cost estimates. The study focused on platted subdivisions within the unincorporated Indian River County and City of Sebastian. ANALYSIS: SBS has completed the evaluation, and the entire report is attached as part of the subject staff report. The goal of the evaluation is to prioritize the areas based upon various physical and environmental factors, and determine the feasibility of incorporating the proposed systems into the 10 -year Capital Improvements Plan. An IRC -specific formula was developed and modeled after similar studies for Martin County (Martin County Septic System Evaluation Final Report; CapTec Engineering, Inc.; February 13, 2015) and Brevard County (Save Our Lagoon Project Plan for Brevard County, Florida; TetraTech, Inc and Close Waters LLC; July 28, 2016). The IRC formula was modified from the Martin and Brevard studies to consider and weigh physical and environmental factors that SBS and IRCDUS staff determined to be best representation of Indian River County conditions. The following factors were utilized in the initial ranking of the three hundred and twenty-five (325) platted subdivisions currently on septic: • Population Density for Loading Concentrations • Proximity to Surface Waters • Location of the Community in Relation to the 100 -year Flood Plain — FEMA Flood Plain • Depth of the Ground Water Table • Soil Conditions of the Drain Field — Soil Type • Age of the Surface Water Management System • Age of the Existing Onsite Sewage Treatment and Disposal Systems (OSTDS) Each factor was evaluated and assigned an index number that generally ranged from 0 to 12, with 0 being the minimum and 12 being the maximum impact. The formula used to determine the ranking is simply the sum of all the factors. The higher the resulting sum (the "score"), the higher the estimated impact to the Indian River Lagoon (IRL). This formula, initially developed for the Martin and Brevard Attachmenit 2