Water and Wastewater Facilities Master Plan
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Water and Wastewater Facilities Master Plan Prepared for: Funded by the Border Environmental Cooperation Commission under Contract # CONTA00-010 El Paso County Water Authority M.U.D
description
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 - PowerPoint PPT Presentation
Transcript of Water and Wastewater Facilities Master Plan
Water and Wastewater Facilities Master Plan
Prepared for:
Funded by theBorder Environmental Cooperation Commission
under Contract # CONTA00-010
El Paso County Water Authority M.U.D
Project Purpose
Provide EPCWA with definition of facilities needed toexpand their existing wastewater system to serve the StudyArea and improve deficiencies in the water system.
Provide EPCWA with a document that may be usedas supporting documentation in the preparation ofa BECC Step II Form in the BECC Project Certificationprocess for NAD Bank Funding.
EPCWA Study Area Boundaries
Study Area Population Data
EPCWA connection commitments, 1990 censusand actual 2000 connections.
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Existing Water System Information
Existing Groundwater Resources are available in theWheeler Well Field (>1000 TDS) and theDesert Well Field (750 - 1250 TDS)
Maps of the existing system were collected and usedto develop a hydraulic model of the existing system.
Demands from the past 2 years were tabulated to determineaverage, peak day and peak hour flow rates for futurepopulation projections
Reverse Osmosis Plant currently treats Wheeler WellField Water.
Groundwater Resources Required
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Volume (acre-feet) Quality (mg/L TDS)
20 year System Demand 115,305 <1000
Wheeler Well Field 15,400* Approx. 1500
32 and 36 Well Fields 84533 (1) 750 to 1250
* an additional 19,200 acre-feet may recharge the Wheeler Well Field
Deficiencies of the Existing System
Running the model with the elevated tanks below themid-level showed the pressures in the Horizon ViewEstates area dropping to between 30 and 35 psi.
Low pressures have been documented with chartrecorders placed in the Horizon View Estates byGray-Jansing & Associates, Inc. and EPCWA.
The cause of this pressure drop is the lack of water linelooping 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 futuredemands including areas of new development.
Pipe sizes were optimized to meet minimum pressurerequirements 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 $/Unit Qty. Cost of InstallationImmediate Improvements12” Agua Dulce and Horizon View Estates $28.50 10,000’ $285,000Prior to 200512” Desert Breeze Subdivision $28.50 4,250’ $121,12512” Horizon Mesa Subdivision $28.50 3,100’ $88,35012” B&G (Paseo del Este) Subdivision $28.50 1,800’ $51,3002,500 gpm Pump Station Expansion EA. $850,0002 MGD R.O. Expansion EA. $2,000,0001.5 MG Elevated Storage Tank EA. $3,800,000
Total $6,910,7752005 Improvements12” Desert Breeze Subdivision $28.50 2,300’ $65,55012” Horizon Mesa Subdivision $28.50 4,100’ $116,85012” B&G (Paseo del Este) Subdivision $28.50 1,700’ $48,4502,000 gpm Pump Station Expansion EA. $690,0002 MGD R.O. Expansion (New Bldg Req) EA $3,500,0001 MG Elevated Storage Tank EA $2,600,000
Total $6,520,850
Phasing of Projects and Cost Opinion
2010 Improvements12” Desert Breeze Subdivision $28.50 2,000’ $57,00012” Horizon Mesa Subdivision $28.50 2,200’ $62,70012” B&G (Paseo del Este) Subdivision $28.50 3,400’ $96,9001,500 gpm Pump Station Expansion EA. $550,0001 MGD R.O. Expansion EA. $1,000,0001 MG Elevated Storage Tank EA. $2,600,000
Total $3,066,6002015 Improvements12” Desert Breeze Subdivision $28.50 3,450’ $98,32512” Horizon Mesa Subdivision $28.50 3,600’ $102,60012” B&G (Paseo del Este) Subdivision $28.50 4,100’ $116,8502,000 gpm Pump Station Expansion EA $690,0001 MGD R.O. Expansion EA $1,000,0001 MG Elevated Storage Tank EA $2,600,000
Total $4,607,775
Subtotal for all projects $21,391,000Contingency (20%) $4,278,200
Total $25,669,200Engineering & Administration (14%) $3,593,688
Project Total $29,262,888
Existing Wastewater System Information
Current WW treatment capacity is 1.0 MGD. 0.5 MGDLagoons and 0.5 MGD activated sludge plant.
Maps of the existing system were collected and usedto 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
A large portion of the collection system is Vitrified ClayPipe.
Projected Wastewater Flows
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2000 8,174 0.621 MGD 3.349 2.08 MGD2002 18,768 1.33 MGD 2.867 3.80 MGD2005 34,096 2.41 MGD 2.564 6.17 MGD2010 45,000 3.18 MGD 2.434 7.74 MGD2015 53,500 3.78 MGD 2.357 8.90 MGD2020 63,965 4.52 MGD 2.279 10.30 MGD
Wastewater Flow Analysis
Lift station and gravity piping was added to model toserve existing un-sewered areas. (Agua Dulce, Lakeway,Burnette Ranchettes, Horizon View Estates and El Paso Hills)
Population and flow projections were added to thewastewater hydraulic model for current day conditions,2005, 2010, 2015 and 2020.
Pipe sizes to handle the projected flows were determinedand checked with velocity and slope criteria.
Deficiencies of the Existing System
Sections of piping along Alderwood Manor near theAshford intersection are at capacity.
Existing piping along Horizon Blvd between the WWTP and Darrington is already at or nearing full capacity.
Improvements to Serve Un-sewered Areas
Regional Lift station near New R.O. Plant.
Lift stations to pump wastewater from Lakeway, BurnetteRanchettes towards the proposed regional lift station.
Wastewater collection piping within the subdivisions.
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 ProjectsTotal Opinion of Cost: $11,435,500
Treatment Capacity and Disposal Area Required
Year Land Area(sq. ft)
WastewaterFlow
App. Rate(gal/sf/day)
Land Area(acres)
Land Area(Sq. Miles)
2005 33,472,222 2,410,000 0.072 768 1.202010 44,166,667 3,180,000 0.072 1,014 1.582015 52,500,000 3,780,000 0.072 1,205 1.882020 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 another0.25 sq. mi. of GLO land already committed and permitted for disposal.
Land Disposal of Effluent
Irrigation of Turf Areas
Commercial and Industrial Reuse
Disposal Alternatives
Wastewater Treatment Plant Phasing
Description 2002 2005 2010 2015
Construct new 2MGD extend aerationtreatment plant
$5,500,000
Pumping to DisposalArea 2.2 MGDCapacity
$520,000
Construct new 2MGD extend aerationtreatment plant
$5,500,000
Pumping to DisposalArea 0.7 MGDCapacity
$190,000
Pumping to DisposalArea 0.7 MGDCapacity
$190,000
Totals $5,500,000 $520,000 $5,690,000 $190,000
