The Challenges of Developing a New Drinking Water Source New Drinking Water Treatment Building
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1 The Challenges of Developing a New Drinking Water Source New Drinking Water Treatment Building
2 Outline Our Facilities GAUD s Water Supply History Back to Wells 2003 Study Surface Water Treatment Facility (Backup) I-95 Vulnerability New Riverside Well Development Successes and Challenges
3 Drinking Water Statistics Serves 13,000 Customers in Greater Augusta Manchester, Chelsea Vassalboro, East Winthrop & Hallowell 130 Miles of Water Piping 6,000 Connections 8 Storage Tanks (12 Previously) 4 Booster Pumping Stations 5 Wells 8 Pressure Zones As of February, Slightly Used Surface Water Treatment Plant
4 Drinking Water Supply History Augusta Water Co. Kennedy Brook Augusta Water District Typohoid Epidemic Bond Brook-Triangle Wells 2.5 Million Gallons per Day (MGD) Third Well Brookside 1.4 MGD Metering Begins Kennebec River Mechanical Filters District Office Expanded Operations Carleton Pond & Cobbosseecontee Exceptional Growth Average Daily Usage: 4.0 MGD G.F. Laurin Water Treatment Facility (Carleton Pond) 5.0 MGD
5 Drinking Water Supply History Supply, Feasibility & Planning Study Ground Water Exploration Chelsea RFP for Ground Water Explorations Ground Water Exploration Continued Mutual Aid/ Regional Efforts Triangle Treatment Building & Reactivation of Bond Brook Wells Augusta Water District + Augusta Sanitary District = Greater Augusta Utility District Redundant Supply Discussions Begin Water Supply Plan Malta Tanks & Riverside Wells
6 Project Timeline October 7, 2011 July 2015 New Supply Online RFP for Ground Water Explorations March 30, 2011 June December 2012 Option Agreements Riverside Drive WM 7,000 ft of Initial Work Plan New Source City Politics Strategic Water Supply Plan Completed April 2012 Hydrogeological Investigations March 2013 Production Wells Gravel Pit Reclaimation Malta Tank
7
8 Political Barriers Why Riverside Drive? CSO Phase 3 Rates G.F. Laurin Surface Water Plant is Still on the table Unanswered Questions We need a plan
9 Action Plan for Additional Drinking Water Resources (2012) Goal: Reduce vulnerability of Bond Brook well supply District commissions desktop study Alternative supply options identified
10 Why Develop Additional Water Sources? Several large accidents (2011, 2013 & 2015) on I-95 caused concern about possible contamination
11 G.F. Laurin Water Treatment Facility Supply Challenges ( ) Declining Industrial Demand for Water Water Conservation Very High Operating Costs In 2004, GAUD reactivated Bond Brook Wells and put Water Treatment Facility in Standby Mode
12 Bond Brook Wells Overview (2004) Three Gravel-Packed Wells with Total Capacity of 2.8 MGD: - Triangle Well (1.0 MGD) - South Well (0.8 MGD) - Brookside Well (1.0 MGD) Treatment Chlorination, Phosphate, Fluoridation Water Quality Good, High Hardness (<100 mg/l) Location Near Downtown Augusta/I-95
13 Well Locations
14 Options Considered Reactivate the Water Treatment Facility Interconnection with Neighboring Systems - Winthrop Utilities District - Hallowell Water District - Gardiner Water District - Kennebec Water District Create New Groundwater Supplies within District
15 Locations of Various Options Considered
16 Options for New Groundwater Supply Development within District Objectives - Reduce vulnerability of Bond Brook - Supply on East Side of Kennebec MGD Capacity Possibilities: - Mount Vernon Road Area - Leighton Road Area - Kennebec Esker - Riverbank Filtration at Carleton Pond
17 Locations of Wells & Tanks in Augusta North Augusta Aquifer (Mt. Vernon Road Area) Kennebec River Esker
18 Option 1 Expand Development in Mount Vernon Road Area Mt. Vernon Road Area Projected Costs: - Capital Cost: $4.3 Million - Operating Costs: $432/Million Gallons Disadvantages: - West Side of River - Rural Area - Limited Opportunity for New Customers - Vulnerability to I-95 Remains - Large Water Main Extension
19 Option 2 Expand Development in Leighton Road Area Projected Cost: - $226/Million Gallons Disadvantages: - West Side of River - Rural Area - Limited Opportunity for New Customers - Vulnerability to I-95 Remains - Large Water Main Extension Leighton Road Area
20 Option 3 New Supply in Riverside Area of Augusta Sand and Gravel Deposits Projected Costs: - Capital Cost: $2.6M - Operating Costs: $191/Million Gallons Advantages: - Supply on East Side of Kennebec River - Extension of system towards Kennebec Water District - Distribution System Simplification - Elimination of Riverside Zone - Elimination of 2 Riverside Tanks - Consolidation of Malta and Riverside Zones - Consolidated Zone 4 Tanks to 1 Tank Priority Sites in Riverside Area of Augusta
21 NEW
22 Riverside Well (Kennebec Esker)
23 Supply Alternatives Cost Comparison Riverside Well Sites Best Value
24 Riverside Groundwater Exploration Process Desktop Mapping of Threats Geophysical Surveys Test Well Exploration Initial Site Approval from DWP Prolonged Pumping Test Final Source Approval Well Construction Commissioning
25 New Riverside Wells Statistics Two Wells - Mainex Well: 1.0 MGD - Bonenfant Well: 1.0 MGD Gravel-Packed Wells - 18 x 24 Wells - Hardness > 150 mg/l foot setback from river - Low Metals (Iron, Manganese, Arsenic) Well Head
26 Riverside Wells Construction Pitless Adapters Local Power Disconnects Accessible for Pump Removal and Service Bonenfant Well Bonenfant Well Head MaineEx Well
27 Well Core Composition
28 Riverside Site Challenges Gravel Pit Reclamation Vernal Pool Steep Topography/ Slope Stability Access Security
29 Riverside Site Aerial image before reclamation activities
30 NEW
31 Gravel Pit to Wellhead Protection
32 NEW Maine DEP Wright-Pierce Brian Tarbuck, P.E. General Manager, GAUD Andy Begin, P.E. Assistant General Manager/Chief Engineer, GAUD GAUD Board of Trustees Layne Construction CH Stevenson Construction Maine Drinking Water Program
33 NEW Maine DEP Wright-Pierce Brian Tarbuck, P.E. General Manager, GAUD Andy Begin, P.E. Assistant General Manager/Chief Engineer, GAUD GAUD Board of Trustees Layne Construction CH Stevenson Construction Maine Drinking Water Program
34 Gravel Pit Reclamation MaineEx Well Location
35 Stakeholders Maine DEP (Vernal Pool) Maine Drinking Water Program Augusta Planning Board Guilford Transportation (Railroad) Landowners GAUD City of Augusta
36 Gravel Pit Reclamation
37 Reclamation Photos
38 Gravel Pit Looking South after Reclamation Kennebec River MaineEx Well
39 Gravel Pit Looking North after Reclamation Treatment Building Mainex Well Bonenfant Well
40 Bonenfant Well
41 Vernal Pool Restoration Plan Required Relocation of Access Road Requires Annual April Assessment Salamander Egg Masses Woodland Vernal Pool
42 Riverside Wells Treatment Building Construction Chemical Treatment - Disinfection with sodium hypochlorite - Sequestering agent (hardness control) - Fluoridation - Propane generator relocated from G.F. Laurin Water Treatment Facility - Brick masonry - Radiant floor heat - No windows and floors drains - Power isolation at wells (supplied underground) Groundwater rule-ready
43 Relocation of Propane Generator Radiant Floor Heat Fluoride Feed System Sodium Hypochlorite Feed System
44 New Treatment Building
45 New Drinking Water Supply Project Partnership GAUD - Construction Administration - Resident Observation - Gravel Pit Restoration - Land Acquisition - Public Engagement Woodard and Curran SCADA/Integration Wright-Pierce - Permitting, design and bidding - Support during construction
46 Stakeholders Maine DEP (Vernal Pool) Maine Drinking Water Program Augusta Planning Board PanAm Transportation (Railroad) Landowners GAUD City of Augusta
47 Land Acquisition Property Cost Bonenfant $36,000 Stevenson $12,250 Foss $23,000 MainEx $326,000 MainEx (Pit Reclaim) $382,000 Total $779,450
48 Project Costs Description Cost Water Supply Plan $60,000 Hydrogeological Study $116,500 Well Construction & Design $194,000 Land & Negotiations $1,000,000 Transmission Main/Treatment Bldg $1,700,000 Emergency Generator $115,600 Riverside Drive WM Replacement $1,300,000 Total $4,485,600
49 Acknowledgements Maine DEP Wright-Pierce Brian Tarbuck, P.E. General Manager, GAUD GAUD Board of Trustees Layne Construction CH Stevenson Construction Maine Drinking Water Program
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