APPENDIX A CALCULATION OF NET PRESENT VALUE OF WATER SUPPLY PACKAGES. Total Capital Total Annual O&M Net Present Value ($) ($ per year) ($ Millions)

Transcription

1 APPENDIX A CALCULATION OF NET PRESENT VALUE OF WATER SUPPLY PACKAGES Package Package 1 - Recycled Water + Emergency Supply + WTP Expansion Total Capital Total Annual O&M Net Present Value ($) ($ per year) ($ Millions) Low estimate $ 22,970,000 $ 85,000 $ 20.2 Recycled Water $ 10,810,000 $ 85,000 $ 10.3 Emergency Supply $ 5,300,000 $ 4.3 WTP Expansion $ 6,860,000 $ 5.6 High estimate $ 32,900,000 $ 122,000 $ 29.0 Recycled Water $ 20,740,000 $ 122,000 $ 19.1 Emergency Supply $ 5,300,000 $ $ 4.3 WTP Expansion $ 6,860,000 $ $ 5.6 Package 2 - TAP Pipeline + WTP Expansion $ 19,100,000 $ 337,000 $ 21.6 TAP Pipeline $ 12,240,000 $ 337,000 $ 16.0 WTP Expansion $ 6,860,000 $ $ 5.6 Package 3 - Expanded TID Supply + Emergency Supply + WTP Expansion $ 18,310,000 $ 50,000 $ 15.8 Ashland Canal Piping $ 2,690,000 $ $ 2.2 Recycled Water to Imperatrice Property $ 3,460,000 $ 50,000 $ 3.7 Emergency Supply $ 5,300,000 $ $ 4.3 WTP Expansion $ 6,860,000 $ $ 5.6 Package 4 - Additional Ashland Creek Storage + Emergency Supply + WTP Expansion $ 91,860,000 $ 100,000 $ 76.5 Additional Ashland Creek Storage $ 79,700,000 $ 100,000 $ 66.6 Emergency Supply $ 5,300,000 $ $ 4.3 WTP Expansion $ 6,860,000 $ $ 5.6 Package 5 - Potable Groundwater + WTP Expansion Low estimate $ 10,390,000 $ 82,000 $ 9.9 Groundwater $ 3,530,000 $ 82,000 $ 4.3 WTP Expansion $ 6,860,000 $ $ 5.6 High estimate $ 27,180,000 $ 164,000 $ 25.1 Groundwater $ 20,320,000 $ 164,000 $ 19.5 WTP Expansion $ 6,860,000 $ $ 5.6 Package 6 - Aquifer Storage and Recovery + Emergency Supply + WTP Expansion N/A N/A N/A Aquifer Storage and Recovery System N/A N/A N/A WTP Expansion $ 6,860,000 $ $ 5.6 Emergency Supply $ 5,300,000 $ $ 4.3

2 Water Conservation & Reuse Study (WCRS) & Comprehensive Water Master Plan (CWMP) Project Open House January 19, 2011

3 Our goal today is to receive community input regarding our future water supply 1. Water Supply Overview: a. Ashland s water supply system, its challenges, and identified options 2. Water Supply Challenges: a. Future limitations and shortages 3. Supply Options: a. The shortlist of AWAC accepted packages 4. Project Schedule: a. From this meeting to Council action 5. Community Input a. We need your concerns and questions voiced today.

4 ASHLAND WATER SUPPLY OVERVIEW

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6 Raw water from both sources is treated at the Ashland WTP

7 ASHLAND WATER SUPPLY CHALLENGES

8 The Ashland Creek/Reeder Reservoir supply is vulnerable 1. Reeder Reservoir is vulnerable to drought a. Led to voluntary and mandatory curtailments in 2009 b. May be vulnerable to climate change

9 TID supply adds reliability but is still dependent on the same WTP 1. When the WTP is not in service, there is no potable supply to the City 2. WTP is vulnerable to landslides, floods, forest fires 3. In 1997, mudslide led to a water shortage for ~2 weeks 4. In 1974, it was out for around a month

10 In the future, these challenges may become worse 1. Climate change

11 In the future, these challenges may become worse 1. Climate change 2. Future demands

12 In the future, these challenges may become worse 1. Climate change 2. Future demands 3. Aging infrastructure

13 In the future, these challenges may become worse 1. Climate change 2. Future demands 3. Aging infrastructure 4. More stringent environmental standards

14 Climate change analysis predicts increased Ashland Creek flows in spring but decreased flows in summer Streamflo ow, cfs Climate Change Range Historic Climate Change Average The average of the climate change scenarios was used for our analysis

15 LOS goals were selected in four categories to address the challenges Have sufficient supply to meet projected demands that have been reduced based on additional 5% conservation (with a goal of achieving 15%) Community will accept curtailments of 45% during severe drought Implement redundant supply project to restore fire protection and supply for indoor water use shortly after a treatment plant outage Meet or exceed all current and anticipated regulatory requirements

16 After extensive analysis, the additional needed water supply capacity was identified Conservation Goal Additional Needed Supply Capacity 1924 Scenario with Climate Change (AF) 5% % % 210 The 1924 climate change scenario was selected as the basis for the supply packages

17 WATER SUPPLY OPTIONS

18 Six main supply alternatives are being evaluated 1. Recycled water 2. TAP Pipeline 3. Expansion of TID supply 4. Additional Ashland Creek impoundment 5. Groundwater/ASR 6. Expanded or redundant WTP

19 Overall, there is a potential range of capacities and costs for a recycled water system Option Capital Cost Capacity Potable Demand Offset Option 1 $10.5 million Option 2 $20.3 million Option 3 $14.5 million 930 AF 0.1 mgd 1,620 AF 0.6 mgd 813 AF 0.6 mgd

20 The TAP pipeline would provide a supply from Medford Capacity: 1.5 mgd 688 AF Cost: $12.7 million

21 Of the TID options, piping the City s portion of the canal would increase supply Capacity: 698 AF Cost: $6.15 million Assumes that WWTP Effluent is used on Imperatrice property and the TID Water Rights are then transferred to Potable Water Use

22 Potential GW option to meet goals at reduced costs: existing wells 1. May be less expensive than new wells 2. Numerous hurdles : a. Ability to sustain capacity is unknown b. Water quality suitable for drinking? c. Access agreement or purchase from owners d. Water rights required from OWRD 3. Cost estimates range from $2M - $15M+ for 1.5 mgd capacity (688 AF)

23 Two alternatives to the standby water treatment plant: 1. Temporary/mobile water treatment plant: a. Prepare a site with utilities and connections to the raw water and potable water systems b. During a plant outage, a supplier would deliver, connect and operate a temporary plant 2. Potential Talent intertie a. Construct 2/3 of the TAP pipeline, starting from Ashland and extending to Talent b. Temporary pumps deliver the water A separate analysis can determine which is the preferred solution

24 Options exist to protect the plant from floods to improve reliability Cost: $1 million

25 Four water supply packages meet the LOS Goals 1. TAP Pipeline a. Assuming 600 AF TID supply is indeed available as a water supply 2. Groundwater a. Assuming reliable groundwater supply proves feasible 3. Recycled water + the protected water treatment plant 4. TID expansion + the protected water treatment plant It s assumed that all packages will include expansion of the existing water treatment plant

26 AWAC scored each package relative to agreed criteria 1. Insert the final table here after adding the public acceptability scores

27 PROJECT SCHEDULE

28 Remaining Project Schedule 1. Public Open House (this meeting) January 19, AWAC to meet and select a final water supply package for recommendation to City Council January XX, AWAC presentation to City Council for action February XX, Updated CIP and Rate Study May Project Completed June 2011

29 COMMUNITY INPUT

30 Discussion Questions 1. Question 1 2. Question 2