Edwardsport IGCC Mine Stabilization Project Construction Constructionat atthe

Edwardsport IGCC Mine Stabilization Project Construction Constructionat atthe

Edwardsport IGCC Mine Stabilization Project Construction Constructionat atthe theLargest Largest Remediation RemediationMine

MineGrouting GroutingProject Project ininNorth NorthAmerica America Presented by: Howard Concrete Pumping Co., Inc. Lynn Crayne Frank Howard III

Acknowledgments Jeff Fields, Senior Engineer Jim Sublett, Senior Sourcing Specialist GAI Consultants, Project Designer Bob Turka, Senior Project Manager Mining History at the White River Mine

Mined in the 1920s and 1930s using the room and pillar method No evidence of retreat or split pillar mining Mine was flooded To this day The pillars are mostly in place Sinkholes onsite indicate shallow cover and mine subsidence The Existing Edwardsport Plant

A 160-megawatt coal combustion plant The original unit was built in 1918 but is no longer operational Three other operating units were built between 1944 and 1951 It currently operates at a fraction of its capacity Jack Stultz, General Manager of Duke Energy Indiana, will be able to update you to the benefits of the new proposed facility. Construction Overview

Construction includes grouting beneath nearly 30 acres of the proposed IGCC facility Drilling into the abandoned deep mine using both track-mounted and tire-mounted drill rigs Grout is to be manufactured onsite by two volumetric mixing plant From the point of manufacture, grout is pumped by a Schwing BPL 4000 pump via 4-inch steel slick line to second pump at the point of placement The second pump has a 39-meter placing boom with an

attached tremie pipe for ease of placement Construction Overview (Continued) All materials for the grout are delivered and stored onsite, including cement, sand, and fly ash Fly ash to be mined from the existing fly ash pond onsite Cement from local plant Water for the grout manufacture is obtained from the mine pool An observation well is used to monitor the mine pool

height and water pH If the mine pool rises one foot, a pump installed into the mine is used to remove mine water to retention pond Estimated completion date is February 2008 Drilling Specifics The construction includes nearly 2,500 boreholes Holes are approximately 6-inch in diameter On average, they are 45 to 50-feet deep Thats over 115,000 linear feet of drilling

Holes are cased to the top of rock using plastic (PVC SDR 35) casing Casing is 6 inches in diameter and is manufactured in 10 feet sections Casing is installed to an average depth of 20 feet Drilling Specifics (Continued) Holes are plotted on a grid with 25-feet spacing Approximately 220 holes are drilled on angle

Angles of inclination vary from 22 to 45 Angles are necessary because of site access issues due to existing 345 kV power lines Angle Drilling Beneath Power Lines Leave a blank slide for the insertion of a typical boring log to be inserted by us Grouting Specifics

There are two types of grout to be used: Barrier Grout to be used on the perimeter of the mine limits Consists of Type I cement, sand, Type F fly ash, and water Has an 8-inch slump Production Grout to be used on the interior Consists of Type I cement, Type F fly ash, and water Has a 60-second flow

Grouting Specifics (Continued) All grout has a design strength of 200 psi at 28 days Actual design strengths are averaging 450 psi at 28 days using cubes for compressive testing with an onsite lab Total grout quantity estimated for the projects completion is 180,000 cubic yards Average production is 2,000 cubic yards per day Fly ash for the grout manufacture is mined and dried

from the existing fly ash pond Increased pond storage is a secondary benefit for Duke Energy Volumetric Batch Plant Key Points The existence of abandoned deep mines creates surface subsidence problems which complicate development in many regions of the country

As development locations become limited, mine stabilization construction is becoming more common Mine stabilization construction can effectively allow development on abandoned mine land Even for very high-value structures Thanks to The Indiana Society of Mining and Reclamation Special Thanks to:

Colleen Baughman Ron McAhron Questions?

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