Annapolis Water Treatment Plant Facility Plan Study

1
Annapolis Water Treatment Plant Facility Plan
Study

• Hazen and Sawyer

Presentation
April 29, 2009
City of Annapolis, Maryland
2
Presentation Agenda

• Purpose of the Project
• Initial Study
• Findings
• New Plant Analysis
• Recommendations

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Purpose of the Project

• Evaluate the Existing Annapolis WTP and Identify
  Items to be Changed to
• Improve Operator Safety
• Improve Ease of Operation
• Provide Redundancy to Ensure Continuous Supply of
  Water to Citys Residents.

4
Initial Study

• Visit the Plant
• Interview Operations Staff
• Review Data, Reports, Drawings, etc.
• Identify What Works and What Does Not

5
Existing Plant Site Plan
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Findings

• Finished Water Quality is Currently Meeting State
  and Federal Regulations
• Capacity of the Plant is Able to Meet Current
  Demand (but lack of redundancy poses risks to
  meeting this demand)
• Even Though An Older Facility with Difficult to
  Operate / Maintain Equipment, Operations Staff
  Doing an Excellent Job

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Findings (cont.)

• Present Condition of Facilities Inhibits Design
  Capacity of 10 mgd
• Lack of Redundancy / Reliability
• ADA Compliance Issues
• Chemical Handling Safety Issues

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Findings (cont.)

• Many Structures Date to the 1930s and 1950s and
  Are Showing their Age
• Much of the Piping and Mechanical
• Equipment is Difficult to
• Operate and Maintain
• Lack of Spare Parts Requires
• Custom Machining
• Difficult to Access / Maintain Equipment in Gate
  Valve Rooms And Filter Gallery
• Non ideal treatment and control
• Leaded joint pipe

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What are The Citys Options to Address These
Challenges?

• Phased (Piecemeal) Upgrade Program
• Comprehensive Upgrade
• New Water Treatment Plant

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New Annapolis Water Treatment Plant(Conceptual
Site Plan)

• PUT CONCEPTUAL SITE PLAN HERE

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Piecemeal Approach

• Advantages
• Keeps CIP costs to a minimum from year to year.
• Disadvantages
• Will not provide necessary redundancy.
• Aforementioned problems still plague the plant.
• Some equipment / structures will still be
  vulnerable to imminent failure.
• No long-term cost savings facilities will be
  renovated or constructed every few years until
  plant is eventually replaced.

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Comprehensive Upgrade

• Advantages
• Modernizes many plant processes, improves
  efficiency.
• Rehabilitates existing structures.
• Better prepares plant for medium term challenges
  of the 21st century.
• No more expensive than piecemeal approach in the
  long run.
• Disadvantages
• Still provides only partial redundancy.
• More expensive upfront.
• Many facilities, piping and equipment will need
  replacement
• within 20 years.
• Operator friendliness (e.g. filter gallery) and
  functionality disadvantages since some current
  facilities remain.

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New Plant (Recommended)

• Advantages
• Long-term solution that meets Citys needs for
  next 50-80 years.
• Provides 100 redundancy (meets design capacity
  of 10 mgd, even during repairs)
• Improved energy efficiency.
• Ideal operator work environment.
• Best positions City to satisfy future demand and
  regulations.
• Long term capital costs are no more expensive
  than other two options.
• Current market conditions very favorable to a
  project this size.
• Improved public perception.
• Disadvantages
• Most expensive upfront costs.

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Recommendation

• Construct New 10 mgd WTP
• Continue to Use Existing Finished Water Pump
  Station But Ultimately Replace It in 2024

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Funding Schedule