Outline Septic Systems: A brief overview Collection systems Countywide S2S Ranking • Methodology • Results • Examples • Nitrogen Loading • Current Projects Moving forward/next steps • County Goals • Next Steps Other programs in the Treasure Coast
~ groundwater Dry deposit Ton Figure 7. Nitrogen sources and p athways to streams , including direct discharges, runoff, leaching to ~ subsurface t il e dra inage to ditches, and precipi tat i on dire ct ly into waters . Nit rogen in M inneso ta Surface Waters • J un e 20 13 M innesota Pollution Con tro l Agency
Septic System Fact: There were four (4) major changes to the criteria for septic system placement, requirements and size of systems: Four significant periods of septic regulations* o Rules Prior to ‘72 o Change: ’72 to ‘82 o Change: ’83 to ’97 o Change: ’98 to present *(Chapter 64E ‐ Florida Administrative Code, Standards for On ‐ site Sewage Treatment and Disposal Systems, 3/98)
~ - ~ ~-~ -~ -~=- . ~ n:; ~ Locations of Septic Tanks in Indian River County 30,369 septic systems in Indian River County Lxations of Septic Tanks in Indian River Cow1ty F1 orida ' ' . . ' ' \ I '· I 1 "= - ---'- ·- I Q - - ..... \ / . -- - --- -- - \ -=-- - '· . - ' r - -.r- ' - .l L . • \
Jurisdiction Parcel with No Sewer Service Parcel Count % City of Fellsmere No Sewer Service, Built 1983 or After 648 No Sewer Service, Built Before 1983 464 4% City of Sebastian No Sewer Service, Built 1983 or After 6,807 No Sewer Service, Built Before 1983 1,577 28% City of Vero Beach No Sewer Service, Built 1983 or After 486 No Sewer Service, Built Before 1983 1,000 5% County No Sewer Service, Built 1983 or After 11,419 No Sewer Service, Built Before 1983 7,814 63% Town of Indian River Shores No Sewer Service, Built 1983 or After 93 No Sewer Service, Built Before 1983 60 <1% Town of Orchid No Sewer Service, Built 1983 or After 1 <1% Total 30,369 Data Sources Indian River County Utility Dept, 2013 City of Vero Beach Utility Dept, 2013 Indian River County Property Appraiser, 2013
Indian River County Utility Department Service Area • Excluding COVB, Fellsmere, Town of IRS 325 Subdivisions/ Communities Initial Ranking…”Importance Factor” Weighting Final Ranking
Initial Ranking Seven (7) Factors and associated Index Numbers Index Number Factor Min. Max. Population Density 4(x1*)= 4 12(x2*)= 24 Proximity to Surface Waters 0.1(x1*)= 0.1 12(x2*)= 24 FEMA Flood Plain 0 12 Depth to Ground Water Table 4 12 Soil Condition 4 12 Age Surface Water Mgmt System 4 12 Age of Existing OSTDS 4 12 20.1 to 108 * 1 is minimum importance factor, and 2 is maximum importance factor
Importance Factor Weighting Description (Distance to Nearest surface water) Factor • Adjacent to Indian River Lagoon (IRL) 2.0 Adjacent to Sebastian River (SR) 1.85 • Adjacent to and downstream of spillways for IRFWCD Main, North or South • relief canals or other streams/channels within 1 mile of IRL 1.85 • Adjacent to and downstream of spillways for IRFWCD Main, North or South relief canals or other streams/channels within 1 mile of SR 1.7 Adjacent to and within 1 mile upstream of spillways for IRFWCD Main, North • or South relief canals or other streams from 1-2 miles of the IRL 1.4 Adjacent to and within 1 mile upstream of spillways for SRID laterals Ca and • L, and City of Sebastian waterways; or other Laterals (“C”), sub-laterals, 1.3 streams / channels from 1-2 miles of the SR Adjacent to all other upstream surface waters 1.0 • “Adjacent to” a surface water shall include any community within 100 ft . of a surface water
Population Density x Importance Population Density Index # Factor Score ≤ 2 units/ac 4 x I 4 to 8 2 to 4.8 units/ac* 4 to 12* x I 4 to24 > 4.8 units/ac 12 x I 12 to 24 *Sliding Scale, Index Number = 2.85d – 1.7 D = Density ( 2-4.8) I = Importance Factor (1.0 to 2.0)
Flood Zone Designation Flood Zone Designation Index # / Score Outside 100 year Flood Hazard Area (FHA) 0 <= 1/3 community in FHA 4 1/3 to 2/3 of community in FHA 8 In Flood Zone 12
Depth to Groundwater Table Depth to Groundwater Table (GWT) Index # / Score > 48 inches 4 36 to 48 inches 5 24 to 36 inches 6 0 to 23 inches 10 above GWT 12
Soil Condition Soil Description Index # / Score* Slight (Slightly limited) 4 Moderate (Moderately limited) 5 Severe (Severely limited) 6 * Actual Score = calculate a weighted average number based on percentage of each soil classification within each community
Age of Surface Water Management System Age of Stormwater Mgmt. System (yr) Index # / Score After 2008 2 1999 to 2008 4 1982 to 1998 6 Before 1982 12
Age of Existing OSTDS (septic system) Age of OSTDS/ Septic system Index # / Score 1998 to present 4 1983 to 1997 6 1972 to 1982 10 Before 1972 12
Example of an Initial Ranking Calculation Subdivisions Picked: Floravon Shores Sebastian Highlands Unit 05 River Shores Estates Units 1-4 Proximity of Age of Surface Population Depth to Soil Map Id. Importance Surface Flood Plain Water Age of Existing Initial Subdivision Name Density Groundwat Condition OSTDS Index # Overall Score No Factor Water Index Index # Management Ranking Index # er Index # Index # # System Index # 48 Floravon Shores Subdivision 2.00 9.33 18.24 8.00 10.00 12.00 12.00 6.00 75.57 7 58 Sebastian Higlands Unit 05 1.70 12.30 16.66 0.00 10.00 12.00 12.00 6.00 68.96 12 River Shores Estates Units 1- 320 2.00 14.36 8.56 4.00 10.00 12.00 12.00 10.00 70.92 10 4
Map Id. Subdivision Name Overall Score Initial Ranking S2S Methodology 138 Hobart Landing Unit 2 1 89.19 17 Orchid Island No. 1 2 85.49 18 Orchid Island No. 2 3 84.65 INITIAL RANKING: 139 Hobart Landing Unit 3 4 82.37 2 Hallmark Ocean Subdivision 5 78.45 Study evaluated 325 platted subdivisions 1 Ambersand Beach Sub No 1 & 2 6 75.73 48 Floravon Shores Subdivision 7 75.57 within unincorporated IRC and City of 131 Naranja TR Shellmound Bch Replat of POR 8 74.05 Sebastian for the initial ranking. 52 Sebastian Highlands Unit 02 Collier 9 73.05 320 River Shores Estates Units 1-4 10 70.92 212 Rain Tree Corner Subdivision 11 69.63 58 Sebastian Highlands Unit 05 12 68.96 137 Hobart Landing Unit 1 13 68.28 19 Orchid Isle Estates Subdivision 14 68.27 Factors used in the Initial 275 Amos (A of E) ** 15 67.51 213 Kanawah Acres 16 67.41 199 Verona Estates Subdivision 17 67.38 291 Indian River Heights Units 1 -9 18 66.96 Ranking 273 Diana Park Subdivision 19 66.85 49 Dales Landing Subdivision 20 66.33 • Population Density - Importance factor assigned 278 Stevens Park Unit 1 & 2 21 66.17 272 Pine Tree Park Units 1-4 22 65.24 Proximity to Surface Waters – Importance factor assigned • 196 Little Portion Subdivision Replat OF 23 64.85 • Flood Plain 50 Sebastian Highlands Unit 01 24 63.99 • Depth to Ground Water Table 57 Sebastian Highlands Unit 04 25 63.78 143 Winter Grove Subdivision 26 • Soil Condition 62.82 207 Tropic Colony Subdivision 27 62.60 • Age of Surface Water Management System 32 Halleluiah Acres 28 62.50 Age of the Existing OSTDS • 68 Sebastian Highlands Unit 13 29 62.30 51 Sebastian Highlands Unit 02 30 62.09
Final Ranking Re-prioritization of Initial Top 30 Sewer Cost per home – ascending order Nitrogen reduction cost – ascending order Presence of potable water
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