Mayo-Annapolis Force Main

Mayo Water Reclamation Facility
Expansion Capital Project Overview
Blue Heron Center
Quiet Waters Park
June 18, 2014
(courtesy of Google Maps)
Agenda
1) Introductions
2) Background
3) Project Description
4) Schedule
Mayo WRF: Expansion Capital Project Overview
Anne Arundel County Sewer Service Areas
Annapolis
Service Area
Mayo-Glebe Heights
Service Area
Mayo WRF: Expansion Capital Project Overview
Background
• The Mayo Water Reclamation Facility (WRF) receives
septic tank effluent from Mayo peninsula residents.
• Service area has reached capacity and the County has
imposed a moratorium on future development.
• Discharges to the Rhode River adjacent to shellfish
harvesting areas.
• Uses “natural” treatment processes.
• The Annapolis WRF provides treatment for the Annapolis
service area.
• Has the availability for additional capacity.
• Discharges at the mouth of the Severn River away from
shellfish harvesting areas.
• Provides Enhanced Nutrient Removal (ENR) treatment.
Mayo WRF: Expansion Capital Project Overview
Project Drivers
1. Increase capacity for the Mayo-Glebe Heights service area.
2. Comply with the Maryland Department of the Environment
(MDE) new ENR standards for all major wastewater
treatment plants state-wide.
• The existing Mayo treatment process cannot be modified
to comply with MDE regulations. Replacement of the
existing process with ENR technology would be required.
• The Mayo-Glebe Heights service area is required to
achieve ENR standards by January 2017.
3. Relocate the Mayo WRF Outfall and provide at least a
one-half mile radius beyond the nearest known oyster bed.
• MDE is requiring relocation of the existing outfall as a
condition of expanding plant capacity or implementing
ENR technology.
Mayo WRF: Expansion Capital Project Overview
Project Drivers - Continued
• Expand Capacity – Lift Development Moratorium
o Current Permitted Capacity – 0.615 mgd
o Ultimate Projected Flow – 1.14 mgd
• Upgrade Treatment – ENR Standards
o Current Total Nitrogen – 18.6 mg/L
o ENR - Total Nitrogen < 3 mg/L
o Current Total Phosphorous - 0.76 mg/L
o ENR – Total Phosphorous < 0.3 mg/L
Mayo WRF: Expansion Capital Project Overview
Mayo WRF ENR Alternative Analysis PER
Overview
• Seven Preliminary Expansion Alternatives were
developed by the County for discussions with MDE.
• With MDE’s approval, three alternatives were examined
in GHD’s Preliminary Engineering Report (Nov. 2012):
• Alternative 2 - Implement ENR Upgrade at Mayo WRF
and Discharge Treated Effluent to New Outfall
• Alternative 3 - Pump Septic Tank Effluent from the
Mayo Service Area to the Annapolis WRF for
Treatment and Discharge
• Alternative 4 - Implement ENR Upgrade at Mayo WRF
and Pump Treated Effluent to Annapolis WRF Outfall
for Discharge
Mayo WRF: Expansion Capital Project Overview
Alternatives Analysis
Required MDE Construction Completion Date – January 2017
Parameter
Alternative 2
Alternative 3
Alternative 4
Schedule Length
45 Months
36 Months
42 Months
Design/Permitting Start Date
June 2013
June 2013
June 2013
Construction Start Date
June 2016
Dec. 2014
Dec. 2014
Estimated Completion Date
March 2017
June 2016
Dec. 2016
Notes: 1. Assumed three separate projects, Mayo WRF modifications, forcemain installation, and outfall installation.
2. Due to Annapolis WRF design capacity, plant expansion will not be implemented initially.
Initial Implementation Cost for Alternative 3 is $19.7 Million
Parameter
20-Year Capital Cost
Alternative 2
$40,400,000
Alternative 3
$33,500,000
Alternative 4
$43,400,000
20-Year O&M Cost
$23,400,000
$21,300,000
$23,700,000
Present Worth Cost
$63,800,000
$54,800,000
$67,100,000
Notes: 1. All costs in 2012 Dollars
2. The Capital Cost for Alt. 3 above includes an $13.8 Million allowance for future expansion of the Annapolis
WRF for the 1.14 mgd capacity used for treatment of flows from Mayo.
3. Expansion at the Annapolis WRF is not required until current plant capacity is reached.
Mayo WRF: Expansion Capital Project Overview
Non-Cost Criteria
Site Requirements: Amount of site area required for treatment processes and pumping.
Schedule: Length of schedule required to implement alternative.
Shellfish Impacts: Impacts of the system on shellfish populations and harvesting.
Construction Impacts on Process: Potential degree of impact on process operations during
construction.
Construction Impacts on Public: Potential degree of impact on public as a result of
construction.
Permitting Requirements: Complexity of permits required to implement alternative.
Compliance Monitoring: Simplicity of compliance monitoring.
Operations Effort: Amount of operations staff required to run facilities.
Solids Handling: Simplicity of solids handling operations.
Compatibility with ENR Grant Funding: Estimated eligibility of the alternative for identified
grant funding opportunities.
Environmental Risk: Perceived risk of the alternative to the environment.
Mayo WRF: Expansion Capital Project Overview
Weighted Score for Non-Cost Categories
Criterion
Site Requirements
Schedule
Shellfish Impacts
Construction Impacts on Process
Construction Impacts on Public
Permitting Requirements
Compliance Monitoring
Operations Effort
Solids Handling
Compatibility with ENR Grant Funding
Environmental Risk
Total Potential Score
Parameter
Total Score
Percentage of Highest Score
A
B
C
Weight
Score
(1 to 3)
(1 to 3)
Weighted
Score (A&B)
1
3
2
1
3
3
1
2
1
3
3
3
3
3
3
3
3
3
3
3
3
3
3
9
6
3
9
9
3
6
3
9
9
69
Alternative 2
Alternative 3 Alternative 4
39
76%
51
100%
43
83%
Mayo WRF: Expansion Capital Project Overview
Mayo WRF Project Overview
• The Mayo WRF will be decommissioned and a portion of
the site will be converted into a regional pumping station.
• A force main will pump all septic tank effluent flow
collected from the Mayo Service Area to the Annapolis
WRF for ENR treatment and disposal.
• The treated effluent would be discharged through the
existing Annapolis WRF outfall into the mouth of the
Severn River.
Mayo WRF: Expansion Capital Project Overview
Glebe Heights Project Overview
• The Glebe Heights flow is
accounted for in the
current flow projections for
the Mayo Service Area.
• The Glebe Heights Pump
Station will pump all septic
tank effluent to the Mayo
regional pumping station
and then on to the
Annapolis WRF for
treatment. After which the
Glebe Heights WWTS will
then be decommissioned.
Glebe
Heights
Mayo WRF: Expansion Capital Project Overview
Current Flow Projections for Annapolis and
Mayo Service Areas
Parameter
Annapolis WRF Flow
(mgd) (1)
Mayo WRF Flow (mgd)
Combined Total Flow
(mgd)
2015
2020
2025
2030
2035
8.78
9.01
9.23
9.40
9.49
0.58
0.64
0.69
0.74
0.79
9.36
9.65
9.92
10.14
10.28
(1)
Note:
1. Flows from the 2013 AACo. Master Plan for Water Supply and Sewage Systems, Table 4-2, currently
being considered for adoption by the County Council as part of Bill No. 11-13.
Rated capacity of the Annapolis WRF is 13.0 mgd
Mayo WRF: Expansion Capital Project Overview
Current Status on Field Work
Along the Alignment
• Surveying, Utility Locating, and Environmental Review
• Compiling of the public records for the rights-of-way and
adjacent owners along the proposed alignment.
• Fly the alignment to develop aerial topography
• Hydrographic soundings in the South River
• locate utilities using geophysical methods (e.g.
pipe/cable locators, metal detectors, etc.) and locate
valve box and manhole covers
• Perform soil borings of a depth of 10 feet – 50 feet
• Property owners may be approached with possible rightof-way needs
Mayo WRF: Expansion Capital Project Overview
Mayo to Annapolis Force Main Overview
Mayo WRF: Expansion Capital Project Overview
Mayo WRF
Mayo WRF: Expansion Capital Project Overview
Mayo Community
Mayo WRF: Expansion Capital Project Overview
South River
Mayo WRF: Expansion Capital Project Overview
Quiet Waters Park
Mayo WRF: Expansion Capital Project Overview
Alternative Alignments – Bay Ridge Road
Mayo WRF: Expansion Capital Project Overview
Edgewood Road
Mayo WRF: Expansion Capital Project Overview
Force Main Construction
• Force Mains will be
installed using horizontal
directional drilling (HDD)
which minimizes surface
disturbance
• Mayo Peninsula
• Under the South River
• Quiet Waters Park
• City of Annapolis
• Force main is seamless
corrosion-resistant, longlasting HDPE pipe.
HDD Pipe Installation Equipment
(photo courtesy of GHD)
Horizontal Directional Drilling
(figure courtesy of www.tibban.com)
Mayo WRF: Expansion Capital Project Overview
Anne Arundel County Experience
Horizontal Directional Drilling Projects
Date Installed
(year)
Pipe Diameter
(inches)
Pipe Length
(feet)
Marley Creek Crossing
1990
24"
1,200
Woodland Beach FM
2005
24"
8,400
Annapolis Junction FM
2004
15" & 16"
13,800
Riva Road FM
2012
14"-18"
6,000
Mayo Influent FM
1998
16"
8,100
ongoing
16"
2004
16"
Pipeline Description
Arundel Gateway FM
Cayuga Farms FM
15,200
Mayo WRF: Expansion Capital Project Overview
Schedule
Task
Notice to Proceed
Duration
-
Start Date
March 14, 2014
Completion Date
-
Schematic Design Phase
125 Days March 14, 2014
September 5, 2014
Design Development Phase
142 Days May 14, 2014
November 27, 2014
Construction Document Phase 154 Days September 12, 2014 April 15, 2015
Bidding Phase
130 Days April 15, 2015
October 14, 2015
Construction
305 Days October 22, 2015
December 21, 2016
• Design and construction schedule for the Mayo and Glebe Heights
decommissioning has yet to be determined.
Mayo WRF: Expansion Capital Project Overview
View a copy of this presentation at:
http://www.aacounty.org/DPW/
Follow-up Comments or Questions?
Contact [email protected]
Mayo WRF: Expansion Capital Project Overview
HDD Installation Method Details
Mayo WRF: (figures
Expansion
Capital
Project Overview
courtesy
of www.dipra.org)
More HDD Installation Photos
24” Pipe HDD Equipment on Benfield
Blvd. in Severna Park, MD (2007)
(photos courtesy of Anne Arundel County)
Mayo WRF: Expansion Capital Project Overview
More HDD Installation Photos
2,000 ft. HDD Pipe Installation under
Novato Creek, CA (2008)
(photos courtesy of GHD)
Mayo WRF: Expansion Capital Project Overview

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