Municipal Class Environmental Assessment

1. Municipal Class Environmental Assessment Expansion of Omemee Wastewater Capacity Presented to City of Kawartha Lakes Kevin Warner, P.Geo and John Desbiens, P.Eng

2. Existing Omemee WPCP • 2 sewage lagoons with spray irrigation disposal, rated capacity of 608 m3/day • Average sewage flow in 2009: 828 m3/day • Spray irrigation only permitted April to December • Winter storage capacity of sewage lagoons is inadequate for current flows, required emergency discharges to Pigeon River. Class EA Addendum for Omemee Wastewater Capacity Expansion

3. Class Environmental Assessment Process Class EA Addendum for Omemee Wastewater Capacity Expansion

4. The EA Process - Simplified • Identify and document needs • Present alternatives • Assess the technical and financial merit of each alternative • Select the preferred alternative • Submit application and supporting technical documents for review and approval • Include local stakeholders through the entire process Class EA Addendum for Omemee Wastewater Capacity Expansion

5. Class EA Addendum • The purpose of the addendum study was to assess alternative solutions that were noted to have been neglected in the previous Class EA. • Additional alternative solutions included five on-site treatment and disposal options. • Still considered the 2007 recommended pipeline connections to the Lindsay WPCP and WTP. • The Provincial Policy Statement notes that it prefers all future growth should be serviced by municipal water and wastewater systems. Class EA Addendum for Omemee Wastewater Capacity Expansion

6. Calculation of Wastewater Flows Class EA Addendum for Omemee Wastewater Capacity Expansion

7. Alternative Solutions • Wastewater Pipeline to Lindsay WPCP • Additional Sewage Lagoon • Increased Spray Irrigation Disposal • Subsurface Disposal • Engineered Wetlands w/ Subsurface Disposal • Combined On-Site Disposal Class EA Addendum for Omemee Wastewater Capacity Expansion

8. Assessment Matrix Class EA Addendum for Omemee Wastewater Capacity Expansion

9. Financial Costs Class EA Addendum for Omemee Wastewater Capacity Expansion

10. Preferred Solution • Large subsurface disposal system (LSSDS) • similar to current spray irrigation, with infiltration of effluent into soil • Modular growth (add capacity as required) • Most economically effective solution • Minimal to low impact to all environments Class EA Addendum for Omemee Wastewater Capacity Expansion

11. Alternative Design Concepts Class EA Addendum for Omemee Wastewater Capacity Expansion

12. Impact Assessment • No change in land-use with on-site disposal • Subsurface system would be designed for BOD and TSS (30 mg/L each) • Current effluent quality from sewage lagoons is generally below 15 mg/L for BOD and 10 mg/L for TSS. • Nitrate concentration in GW predicted to be 0.74 mg/L at property boundary. • No residential wells downgradient of disposal field. Class EA Addendum for Omemee Wastewater Capacity Expansion

13. Water Supply • Residents use private wells (80%) + 2 municipal wells (20%) • All wells are sourced from one of two aquifers: • Sand /gravel aquifer and bedrock contact aquifer Class EA Addendum for Omemee Wastewater Capacity Expansion

14. Potential Water Demands Class EA Addendum for Omemee Wastewater Capacity Expansion

15. Class EA Conclusions • Large subsurface disposal system found to have low impact to surrounding environment. • Economical solution, modular growth. • LSSDS location has sandy soils and deep water table. • Current lagoon effluent quality is below tertiary concentrations; not anticipated to strengthen • Nitrate concentrations calculated well below MOE Reasonable Use Criteria limit of 2.5 mg/L. • Water supply – projected growth could be serviced by existing municipal supply wells or additional municipal supply wells. Expansion of the municipal water supply should be assessed in future study. Class EA Addendum for Omemee Wastewater Capacity Expansion

16. Class EA Next Steps • City to review ESR Addendum • Submit draft ESR to MOE for review and approval • Issue Notice of Completion • 30 day comment period • Submit detailed design to MOE for approval • Implementation of approved system Class EA Addendum for Omemee Wastewater Capacity Expansion