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BUILDING STRONG ® East Branch Dam Safety Modification Project PUBLIC INFORMATION MEETING April 16, 2014 Johnsonburg, Pa 1.

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Presentation on theme: "BUILDING STRONG ® East Branch Dam Safety Modification Project PUBLIC INFORMATION MEETING April 16, 2014 Johnsonburg, Pa 1."— Presentation transcript:

1 BUILDING STRONG ® East Branch Dam Safety Modification Project PUBLIC INFORMATION MEETING April 16, 2014 Johnsonburg, Pa 1

2 BUILDING STRONG ® WHY WE ARE HERE Communicate actions to improve dam safety  What’s The Problem  What’s Done  The Way Ahead  Questions 2

3 BUILDING STRONG ® 3 FLOW Soil Rock Grouted Cavity Muddy Seepage Flowing from Rock Drain During Incident WHAT’S THE PROBLEM Risk of Internal Erosion Dam failure averted in 1957, but risk for re-initiation of internal erosion remains. Untreated, Jointed Bedrock in Cutoff Trench Walls

4 BUILDING STRONG ® 4 WHAT’S DONE 1957 to 2008 – Monitor Dam 2008 to 2014 - Interim Risk Reduction 2008 to 2010 – Dam Safety Study 2010 to 2014 – Preconstruction, Engineering & Design 2011 - Initiate Construction Work Platform Cutoff Wall BEDROCK FOUNDATION SOIL

5 BUILDING STRONG ® 5 WHAT’S DONE Construction Contracts 2011 to 2013 - Site Development Contract 2012 to 2014 - Building Contract 2013 to 2014 - Guiderail & Weir Pond Contract

6 BUILDING STRONG ® 6 WHAT’S DONE Instrumentation 2012 – Nine new Piezometers Installed 2013 – Data Loggers Installation 2013 - 2014 – Instrumentation Automation (Ongoing) Typical Piezometer (PZ) Data Logger

7 BUILDING STRONG ® 7 2011 – 2013  Geotech investigations  Acquisition Plan  Plans & specs  Reviews WHAT’S DONE Cutoff Wall Preconstruction WORK PLATFORM CUTOFF WALL RESERVOIR

8 BUILDING STRONG ® 8 WHAT’S DONE Cutoff Wall Work Platform Design Maximum Geometry  100 ft maximum width  30  maximum slope (Slope Stability) Concrete Work Surface

9 BUILDING STRONG ® 9 WHAT’S DONE Cutoff Wall Design

10 BUILDING STRONG ® 10 THE WAY AHEAD Cutoff Wall Construction May 2013 - Advertise cutoff wall contract Oct 2013 - Contractors Submit Initial Proposals 2014 – Award Cutoff Wall Contract Construct Cutoff Wall  4 years 9 months period of performance  Production work hour limitations Reverse Circulation Drill Hydromill

11 BUILDING STRONG ® 11 THE WAY AHEAD Cutoff Wall Construction Increased Traffic Volume and frequency - is contractor, equipment, and construction activity dependent  Average annual traffic on SR 1001 is 164,500 vehicles  3 to 6% more on SR 1001 during construction on average Traffic Control Plan  Maintain access to Maple Lane Transportation Management Plan  Maintenance Plan, Permits & Bonds

12 BUILDING STRONG ® Borrow Area and Support Area (~1 Acre as created by excavation) and E&S Pond Support Area (~1 Acre) Support Area (~1 Acre) Vehicle Turnaround Work Platform Grouting, Soil Mixing, Cutoff Construction Overlook Parking Support Area (~1.8 Acre) Existing Boat Launch (~0.9 Acre) 16 Sep to 14 Apr Support Area (~.7 Acre) THE WAY AHEAD Cutoff Wall Construction Public Safety RE Office Construction Access Government Road Maple Lane Campground

13 BUILDING STRONG ® Instrumentation  Automated & manual readings Visual Inspection  Continued 24-hour government presence Contractor’s Emergency Plan Government’s Emergency Action Plan  Exercises with contractor & emergency responders THE WAY AHEAD Cutoff Wall Construction Dam Safety

14 BUILDING STRONG ® 14 Grouting in Critical Area Allowed 1 Oct – 1 Mar Grouting in Critical Area Allowed 1 Oct – 1 Mar 14 April 2014

15 BUILDING STRONG ® Comply with Federal, State, and County Environmental Regulations Monitor Lake Water Quality Monitor Outflow Water Quality Outflow THE WAY AHEAD Cutoff Wall Construction Safety During Construction

16 BUILDING STRONG ® Website: www.lrp.usace.army.mil/rec/lakes/eastbran.htm EmailCelrp-pa@usace.army.mil Email: Celrp-pa@usace.army.milCelrp-pa@usace.army.mil NEW – Community Information System CONTACT INFORMATIONResources East Branch Dam Operations Mike Setlock East Branch Park Manager, 814-965-2065 E-mail: Michael.J.Setlock@usace.army.milMichael.J.Setlock@usace.army.mil Media & General Inquiries Dan Jones Public Affairs, 412-395-7500 E-mail: Daniel.W.Jones@usace.army.milDaniel.W.Jones@usace.army.mil


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