Transcript No Slide Title

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
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.
EPCWA Study Area Boundaries
Study Area Population Data
70000
60000
Population
50000
40000
30000
20000
10000
0
1985
1990
1995
2000
2005
2010
2015
2020
Year
EPCWA connection commitments, 1990 census
and actual 2000 connections.
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.
Groundwater Resources Required
140000
Volume (acre-feet)
120000
Quality (mg/L TDS)
20 year System Demand
115,305
<1000
Wheeler Well Field
15,400*
Approx. 1500
84533 (1)
750 to 1250
32 and 36 Well Fields
* an additional 19,200 acre-feet may recharge the Wheeler Well Field
Acre-ft of water
100000
80000
60000
40000
20000
0
1995
2000
2005
2010
2015
Year
Cumulative Acre-ft
Acre-ft per year
2020
2025
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.
Immediate Improvements Needed
Approximately 10,000 feet of 12 inch pipe
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.
Water System Improvements by Year
Phasing of Projects and Cost Opinion
Location
Immediate Improvements
12” Agua Dulce and Horizon View Estates
Prior to 2005
12” Desert Breeze Subdivision
12” Horizon Mesa Subdivision
12” B&G (Paseo del Este) Subdivision
2,500 gpm Pump Station Expansion
2 MGD R.O. Expansion
1.5 MG Elevated Storage Tank
Total
2005 Improvements
12” Desert Breeze Subdivision
12” Horizon Mesa Subdivision
12” B&G (Paseo del Este) Subdivision
2,000 gpm Pump Station Expansion
2 MGD R.O. Expansion (New Bldg Req)
1 MG Elevated Storage Tank
Total
$/Unit
Qty.
Cost of Installation
$28.50
10,000’
$285,000
$28.50
$28.50
$28.50
4,250’
3,100’
1,800’
EA.
EA.
EA.
$121,125
$88,350
$51,300
$850,000
$2,000,000
$3,800,000
$6,910,775
$28.50
$28.50
$28.50
2,300’
4,100’
1,700’
EA.
EA
EA
$65,550
$116,850
$48,450
$690,000
$3,500,000
$2,600,000
$6,520,850
Phasing of Projects and Cost Opinion
2010 Improvements
12” Desert Breeze Subdivision
12” Horizon Mesa Subdivision
12” B&G (Paseo del Este) Subdivision
1,500 gpm Pump Station Expansion
1 MGD R.O. Expansion
1 MG Elevated Storage Tank
Total
2015 Improvements
12” Desert Breeze Subdivision
12” Horizon Mesa Subdivision
12” B&G (Paseo del Este) Subdivision
2,000 gpm Pump Station Expansion
1 MGD R.O. Expansion
1 MG Elevated Storage Tank
Total
$28.50
$28.50
$28.50
2,000’
2,200’
3,400’
EA.
EA.
EA.
$57,000
$62,700
$96,900
$550,000
$1,000,000
$2,600,000
$3,066,600
$28.50
$28.50
$28.50
3,450’
3,600’
4,100’
EA
EA
EA
$98,325
$102,600
$116,850
$690,000
$1,000,000
$2,600,000
$4,607,775
Subtotal for all projects
Contingency (20%)
Total
Engineering & Administration (14%)
Project Total
$21,391,000
$4,278,200
$25,669,200
$3,593,688
$29,262,888
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.
Projected Wastewater Flows
12
10
Year
Population
Served
Average Flow
Peaking Factor
Peak 2-Hour
Flow
2000
2002
2005
2010
2015
2020
8,174
18,768
34,096
45,000
53,500
63,965
0.621 MGD
1.33 MGD
2.41 MGD
3.18 MGD
3.78 MGD
4.52 MGD
3.349
2.867
2.564
2.434
2.357
2.279
2.08 MGD
3.80 MGD
6.17 MGD
7.74 MGD
8.90 MGD
10.30 MGD
Daily Flow (MGD)
8
6
4
2
0
1995
2000
2005
2010
2015
Year
Average
2-Hour Peak
2020
2025
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.
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.
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.
Location of Improvements for Un-sewered Areas
Phasing of Projects and Cost Opinion
Phasing of Projects and Cost Opinion
Phasing of Projects and Cost Opinion
Phasing of Projects and Cost Opinion
Wastewater Collection Projects
Total Opinion of Cost: $11,435,500
Treatment Capacity and Disposal Area Required
Year
Land Area
Wastewater
App. Rate
Land Area
Land Area
(sq. ft)
Flow
(gal/sf/day)
(acres)
(Sq. Miles)
2005
33,472,222
2,410,000
0.072
768
1.20
2010
44,166,667
3,180,000
0.072
1,014
1.58
2015
52,500,000
3,780,000
0.072
1,205
1.88
2020
62,777,778
4,520,000
0.072
1,441
2.25
*0.23 square miles is current golf course area and 0.25 sq. mi. is current GLO Land with another
0.25 sq. mi. of GLO land already committed and permitted for disposal.
Disposal Alternatives
Land Disposal of Effluent
Irrigation of Turf Areas
Commercial and Industrial Reuse
Wastewater Treatment Plant Phasing
Description
2002
Construct new 2
MGD extend aeration
treatment plant
$5,500,000
Pumping to Disposal
Area 2.2 MGD
Capacity
2005
2010
$520,000
Construct new 2
MGD extend aeration
treatment plant
$5,500,000
Pumping to Disposal
Area 0.7 MGD
Capacity
$190,000
Pumping to Disposal
Area 0.7 MGD
Capacity
Totals
2015
$190,000
$5,500,000
$520,000
$5,690,000
$190,000