Milestone Reservoir & Pump Station

Drill Tech is contracted to perform the excavation and support for shaft and tunnel construction as part of Loudon Water’s project to fully develop an abandoned quarry into a raw water storage and pumping facility for water sourced directly from the Potomac River. The new reservoir will store over 1 billion gallons of water for its 5 million patrons. The new shaft and tunnels are constructed near and underneath multiple waterways and adjacent to historic construction, which requires careful coordination and a small job-site footprint.

The 2,400 LF of tunneling is split between three horseshoe tunnels that intersect the shaft at different elevations. Additional Drill Tech scopes on this project include the excavation of a new 6ft diameter vertical shaft utilizing raise bore methods, a new 36in and 42in diameter steel water pipe in the shaft and tunnels (installation, welding, and annular backfill), installation and contact grouting of a new 20ft thick concrete tunnel plug, and draining approximately 250M gallons of water from the existing abandoned quarry.

Leesburg, VA

Contract Value:

$42M

Delivery Method:

CMAR

Property Owner:

Loudoun Water

General Contractor:

Clark Construction Group, LLC

Project Overview

  • Drill/blast Excavation
    • 2,400 LF of 11′ x 11′ Tunneling
    • 30′ dia. 275′ Shaft
  • Various Support Systems for Shaft and Tunnel
    • Lattice Girders
    • Reinforced Shotcrete
    • Concrete Invert Slab
    • Reinforced Concrete
    • Custom Steel Formwork
    • Structural Concrete
    • Resin Rock Bolts
  • 250M Gallons Dewatering
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