Saint Louis Water Supply Replacement Gratiot Area Water Authority

Transcription

1 Saint Louis Water Supply Replacement Gratiot Area Water Authority Public Forum October 23, 2013

2 Introduction Welcome and Introductions Format of Meeting Slide Show Presentation Question and Answer Period Please hold questions until after the presentation portion

3 Background 2005 EPA reports to Saint Louis discovery of para-chlorobenzene sulfonic acid (p-cbsa) in City wells Saint Louis files suit against Veliscol and Fruit of the Loom Successor Trusts Saint Louis installs test replacement well near Begole Road - Never Used as Production Well Defendants (not St. Louis or Alma) drill test wells in and conduct aquifer testing Saint Louis reaches $26.5 million settlement Includes Velsicol, Trusts and commitment from EPA 2012 EPA issues Record of Decision for Saint Louis Water Supply Replacement

4 Background (Continued) EPA Record of Decision (June 2012) Included a Public Comment Process Set into Motion the Remedy to Velsicol Problem, Including Saint Louis Water Supply Replacement Calls for Replacement of up to 3.5 Million Gallons Well Capacity for Saint Louis by GAWA Saint Louis Wells Have to Be Abandoned When New Supply is Available

5 Gratiot Area Water Authority January 2012 Alma and Saint Louis create Gratiot Area Water Authority (GAWA) September GAWA accepts competitive proposals for engineering services October GAWA hires Fishbeck, Thompson, Carr, and Huber and OHM to design the water supply replacement project September 2013 Construction begins North Transmission Main Phase 1A

6 St. Louis Water Supply Replacement Supply Wells Raw Water Transmission Mains Water Plant Expansion Finished Water Transmission Mains Booster Pump Stations Saint Louis Elevated Tank

7 Supply Wells

8 Well Supply Objectives Sustainable Groundwater Withdrawal With Well Field Network Long Term Supply Without Mining Aquifer Decentralized Well Field Network Minimizes Drawdown at Any Location Offers Protection from Contamination Increases Operational Reliability

9 Well Field Investigation Desktop Analysis Install Test Borings to Characterize Aquifer and Verify Water Quality Long Term Aquifer Test of Newly Acquired Wells Install Additional Production Wells and Monitoring Wells, Water Quality Analyses, and Test Pump New Production Wells Finalize Well Field Design and Pumps Permitting for Approval to Use

10 Well Log Locations Hydrogeological Model Developed Using: 1) Wells on Record with DEQ Well, Typical 2) Test Wells Installed as Part of Study

11 3-D Borehole Model of Glacial Deposits Overlying Bedrock

12 Fence Diagram of Glacial Deposits Overlying Bedrock

13 Fence Diagram of Glacial Deposits Overlying Bedrock Thick sequences of outwash sands and gravel noted

14 Well Site Study Area Test Boring TW-4 Test Boring TW-1 Test Boring TW-3 Well FN Well PN Well PS Well FS Test Boring TW-2

15 New Well Sites Well FN Alma Well 8 Well FS GAWA Property Limit GAWA Property Limit Well PN Well PS Monitoring Well, Typical

16 Aquifer Performance Testing Each Production Well Has to be Pump Tested As Part of Permitting Process First Test: Long Term Aquifer Performance Comprehensive Aquifer Monitoring During the Test Determine Hydraulic Connection Between Upper and Lower Aquifer Units Information Will be Used to Calibrate a 3D Model Monitoring Wells Used to Field Verify Impact of Pumping (Drawdown)

17 Groundwater Modeling Field Testing Used to Calibrate Model Used to Predict Impacts on Nearby Wells Used to Predict Drawdown at Any Point in Aquifer System Used to Evaluate Sustainability and Adverse Resource Impact (ARI) Used to Optimize Production and Minimize Drawdown for Well Field Design Used to Select Final Locations for Production Wells

18 Next Steps for Well Field Development Two Additional Test Boring Monitoring Wells Long Term Aquifer Performance Test Pumping One of the Newly Acquired Wells Develop Model to Predict Drawdown and Impacts Preliminary Design and Installation of New Production Wells Complete Pumping Test on Each Production Well in Accordance with Permit Requirements Complete Permitting Process

19 Well Permitting State Permit Process Water System Supply Permit Michigan Safe Drinking Water Act, 1976 PA 399 Includes Site Visits by MDEQ Staff Large Quantity Water Withdrawal Permit Part 327, Natural Resources and Environmental Protection Act, 1994 PA 451

20 What if Model Predicts a Problem at Neighboring Well? Design to Avoid Impact Adjustments to Impacted Wells Well Reconditioning/Cleaning Reposition Well Pump Replace Well Problem at Neighboring Well Develops Later? Authority Will Evaluate Problems and Remedy Impacts Caused by System Operation

21 Importance of Wellhead Protection

22 Wellhead Protection Plan (WHPP) MDEQ established guidelines for WHPP WHPA delineation Potential Sources of Groundwater Contamination WHPA Management Contingency Plans New Wells Evaluation Roles and responsibilities Public participation and education

23 Wellhead Protection Delineation Well FN Well-7 Well-1 Well-8 Well PN Well PS Well FS City of Alma Wellhead Protection Delineation

24 Selected Management Strategies 1. Public Education/Awareness 2. Abandoned Well Program 3. Linking the WHPP to Other City Plans 4. County Partnership (MMDHD) 5. City/Township Coordination of Site of Environmental Contamination Cleanups 6. Environmental Permit Checklist 7. Coordination with Other Water Protection Efforts

25 Water Plant Improvements

26 Water Use Alma WTP - Lime Softening Remove Hardness and Iron Filtration and Disinfection Alma Plant is Currently Rated for: 4 million gallons per day (MGD) Capacity When Total Petroleum was Operational: 2 MGD Average Use Currently, Alma averages: 1 MGD Use

27 Planned Capacity Saint Louis Average: 1 MGD Anticipated Combined Average Production: 2 MGD Plant to be Expanded to: 6 MGD Capacity for Current and Future Needs

28 Water Plant Improvements Add 3 rd Filter and Update 2 Existing Filters New Reservoir Valve and Piping Improvements New Pumping Equipment New Chemical Feed Equipment Change from Chlorine Gas to Liquid for Disinfection New Backwash Tank New Electrical and Control System

29 Existing Water Plant Generator Water Plant Existing Backwash Tank 1 MG Reservoir

30 Chemical Feed Area Expanded Water Plant Overflow Tank New Filter New 1 MG Reservoir Backwash Tank

31 Connections to Saint Louis Distribution System Redundant Transmission Mains and Booster Pump Stations 16-inch Diameter Ductile Iron Pipe Pump Stations Controlled by WTP Operators 3 MGD Capacity, Each

32 Transmission Mains Test Boring TW-4 North Transmission Main Phase II Test Boring TW-1 Test Boring TW-3 North Transmission Main Phase IA North Transmission Main Phase IB South Transmission Main Phase II Well FN South Transmission Main Phase I Well PN Well PS Well FS Test Boring TW-2

33 Alma Side of US 127 North Transmission Main Phase IA Cheesman Road Booster Pump Station Michigan Booster Pump Station Alma Water Plant North Transmission Main Phase IB South Transmission Main Phase I Well 7 Well 1 Well FN Well 8 River Pump Station

34 St. Louis Side of US 127 North Transmission Main Phase II 200,000 Gallon Elevated Tank Giddings Street Water Main Cheesman Road Booster Pump Station South Transmission Main Phase II Michigan Street Booster Pump Station

35 Timeline Phase 1A North Transmission Main Complete Fall 2013 Booster Pump Stations Construction Through Spring 2015 Remaining Transmission Mains Construction Through Spring 2015 Water Flow to Saint Louis Begins Summer 2015 Water Treatment Plant Construction Through Fall 2015

36 Timeline (continued) Wells Study Phase In Progress Target Completion - Fall 2014 Well Houses and Raw Water Transmission Main Dependent on Well Schedule Target Completion Summer 2016 Projects Funded Through Superfund Are Subject to Federal Government Allocations

37 Budgeted Costs North Transmission Mains - $7.2 Million South Transmission Mains - $4.2 Million Water Treatment Plant Expansion - $11.9 Million Booster Pump Stations - $2.0 Million Saint Louis Elevated Storage Tank $1.1 Million Wells/Well Houses - $4.6 Million Raw Water Transmission Mains $7.0 Million Existing Well Abandonment $0.5 Million Total: $38.5 Million

38 Customer Rates The Authority Will Sell Water to Both Cities at the Same Wholesale Rate Rate for Each City will Include Cost of Treated Water Plus Costs for System Operation and Maintenance and Capital Replacement User Rate Will Vary for Customers in Each City

39 Questions and Comments City of Alma (989) ftc&h (616) City of Saint Louis (989) Mid-Michigan Health Department (989)