Municipal Keyhole Standards & Approvals

City of Lincoln, Nebraska. Keyhole Excavation and Core Reinstatement Specifcations

March 2016: City of Lincoln, Nebraska. Keyhole Excavation and Core Reinstatement Specifcations

January 2016: City of Lancaster, Ohio. Keyhole Excavation and Core Reinstatement Specifcations

January 2015: City of Springville, Utah. Keyhole Excavation and Core Reinstatement Specifcations

January 2014: City of Chicago approve Keyhole Coring Reinstatement. (reference page 4-8)

July 2012: City of Windsor, Ontario. Keyhole Excavation and Core Reinstatement Specifcations

October 2011: City of London, United Kingdom. Keyhole Coring & Reinstatement Process Update

January 2011: Clarke County,Las Vegas, Nevada. Keyhole Excavation and Core Reinstatement Specifcations

January 2011: Maricopa Association of Governments, Arizona. Keyhole Standards

August 2009:  Montgomery County, Maryland. Keyhole Excavation and Core Reinstatement Specifcations

November 2007: City of Toronto, Ontario. Keyhole Standards - T.S. 4.70 Technical Document

May 2006: New York City, D.O.T. National Grid and Con Edison win approval for Keyhole Coring and Reinstatement from New York City

February 2005: Washington Gas ,Maryland, District of Columbia & Virgina. Jurisdictional Approval of Keyhole Restoration Technology

June 2004: Dallas,Texas. Keyhole Approval

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