Water and Wastewater Facilities Master Plan

1. Water and Wastewater Facilities Master Plan Prepared for: El Paso County Water Authority M.U.D Funded by the Border Environmental Cooperation Commission under Contract # CONTA00-010

2. Project Purpose Provide EPCWA with definition of facilities needed to expand their existing wastewater system to serve the Study Area and improve deficiencies in the water system. Provide EPCWA with a document that may be used as supporting documentation in the preparation of a BECC Step II Form in the BECC Project Certification process for NAD Bank Funding.

3. EPCWA Study Area Boundaries

4. Study Area Population Data EPCWA connection commitments, 1990 census and actual 2000 connections.

5. Existing Water System Information Maps of the existing system were collected and used to develop a hydraulic model of the existing system. Demands from the past 2 years were tabulated to determine average, peak day and peak hour flow rates for future population projections Existing Groundwater Resources are available in the Wheeler Well Field (>1000 TDS) and the Desert Well Field (750 - 1250 TDS) Reverse Osmosis Plant currently treats Wheeler Well Field Water.

6. Groundwater Resources Required

7. Deficiencies of the Existing System Running the model with the elevated tanks below the mid-level showed the pressures in the Horizon View Estates area dropping to between 30 and 35 psi. Low pressures have been documented with chart recorders placed in the Horizon View Estates by Gray-Jansing & Associates, Inc. and EPCWA. The cause of this pressure drop is the lack of water line looping in the area of Horizon View Estates.

8. Immediate Improvements Needed Approximately 10,000 feet of 12 inch pipe

9. Water System Improvements for Future Hydraulic Model was adjusted for projected future demands including areas of new development. Pipe sizes were optimized to meet minimum pressure requirements under peak flow conditions. Phasing was determined for 2005, 2010, 2015 and 2020 demand conditions.

10. Water System Improvements by Year

11. Phasing of Projects and Cost Opinion

12. Phasing of Projects and Cost Opinion

13. Existing Wastewater System Information Maps of the existing system were collected and used to develop a hydraulic model of the existing system. WW flows from the past 2 years were tabulated to determine per capita contributions. 70.62 gpcd Current WW treatment capacity is 1.0 MGD. 0.5 MGD Lagoons and 0.5 MGD activated sludge plant. A large portion of the collection system is Vitrified Clay Pipe.

14. Projected Wastewater Flows

15. Wastewater Flow Analysis Population and flow projections were added to the wastewater hydraulic model for current day conditions, 2005, 2010, 2015 and 2020. Lift station and gravity piping was added to model to serve existing un-sewered areas. (Agua Dulce, Lakeway, Burnette Ranchettes, Horizon View Estates and El Paso Hills) Pipe sizes to handle the projected flows were determined and checked with velocity and slope criteria.

16. Deficiencies of the Existing System Existing piping along Horizon Blvd between the WWTP and Darrington is already at or nearing full capacity. Sections of piping along Alderwood Manor near the Ashford intersection are at capacity.

17. Improvements to Serve Un-sewered Areas Wastewater collection piping within the subdivisions. Lift stations to pump wastewater from Lakeway, Burnette Ranchettes towards the proposed regional lift station. Regional Lift station near New R.O. Plant.

18. Location of Improvements for Un-sewered Areas

19. Phasing of Projects and Cost Opinion

20. Phasing of Projects and Cost Opinion

21. Phasing of Projects and Cost Opinion

22. Phasing of Projects and Cost Opinion Wastewater Collection Projects Total Opinion of Cost: $11,435,500

23. Treatment Capacity and Disposal Area Required Disposal Alternatives Land Disposal of Effluent Irrigation of Turf Areas Commercial and Industrial Reuse

24. Wastewater Treatment Plant Phasing