Sandra Holoman, PA DEP, “Subsidence Remediation Using Structural Support Methods on BAMR Emergency Projects” Wheatley

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The Bureau of Abandoned Mine Reclamation (BAMR) Wilkes-Barre District Office recently completed an emergency project to remediate a non-coal mine shaft subsidence beneath the attached garage of a private residence in Chester County. In Schuylkill County, BAMR is nearing completion on another emergency project to remediate a coal mine subsidence directly behind a private residence. On both projects, BAMR collaborated with Maurice Gardner, a Mine Subsidence Insurance Investigator for the DEP’s Mine Subsidence Insurance Program to assist with designing, specifying, and overseeing the installation of the structural foundation support system for the garage at the Chester County residence and for the steel beam support for the house superstructure at the Schuylkill County residence. Maurice has experience with structural foundation support systems as well as other repair work performed under Mine Subsidence Insurance claims.

Government & Nonprofit

Subsidence Remediation
Utilizing Structural Support Methods
On DEP/BAMR Emergency Projects
Tom Wolf, Governor Patrick McDonnell, Secretary
2017 PA Abandoned Mine
Reclamation Conference
June 22, 2017

Wheatley Engine Shaft Subsidence
Schuylkill Township, Chester County

Void Approx. 17’x19’x85’ Directly Beneath Garage

Garage Apron Removed for 5th
and 6th
Piers

Surface Opened to Access Void for Backfill

R-3 Backfill Level Above Water Table Achieved

Flowable Fill Level Approaching Footer Height

Footer Height Reached with Flowable Fill

Drilling Core Holes in Garage Floor Slab

Using Vibratory Equipment to Level Flowable Fill
Beneath Garage Floor Slab

Placing Flowable Fill Through Core Holes in Garage

Leveling Flowable Fill Beneath Garage Floor

Monitoring Flowable Fill Levels Beneath Floor

Concrete Forms for Replacing of Garage Apron

Questions?
Contact Information:
maugardner@pa.gov
www.pamsi.org
sholoman@pa.gov
www.dep.pa.gov/Business/La

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Sandra Holoman, PA DEP, “Subsidence Remediation Using Structural Support Methods on BAMR Emergency Projects” Wheatley

1. Subsidence Remediation Utilizing Structural Support Methods On DEP/BAMR Emergency Projects Tom Wolf, Governor Patrick McDonnell, Secretary 2017 PA Abandoned Mine Reclamation Conference June 22, 2017

2. Wheatley Engine Shaft Subsidence Schuylkill Township, Chester County

3. Void Measured 2’ x 1’ at Surface

4. Void Approx. 17’x19’x85’ Directly Beneath Garage

5. Underside of Garage Floor

6. Wheatley Engine Shaft Subsidence

7. Wheatley Engine Shaft Subsidence

8. Structural Piering Diagram Example

9. Piering Brackets and Components

10. Excavating For Pier Installation

11. Sawcutting Footer for 1st Pier

12. Sawcut in Footer For Pier Installation

13. Preparing to Install 1st Pier