REHABILITATION OF LAKE SCRANTON DAM

OWNER:  Pennsylvania American Water

ENGINEER: Gannett Fleming

PROJECT TYPE: Rehabilitation of Existing Dam

LOCATION: Lakawanna County, PA

DESCRIPTION OF PROJECT:

Remove and replace existing primary spillway, repoint and post tension anchor auxiliary spillway. Work activities include:

• Clearing and Grubbing

• Design, installation and operation of a temporary dewatering system

• Design, installation and removal of a temporary bin block cofferdam

• Demolition of the existing concrete spillway

• Installation of a new 1,500 CY cast in place labyrinth spillway including anchor dowels

• Installation of downstream embankment toe filters and foundation drainage system

• Installation of 48” x 42” Slide gate, trash rack and staff gauge associated to new spillway

• Masonry repointing of upstream and downstream face of existing dam (auxiliary spillway) and concrete infill of existing archways

• Drill and install (23) 16-strand post tensioned anchors through existing masonry dam

• Refurbish existing sluice gates and stem guides and install new filter chamber stop logs in underwater conditions (within existing gate house)

• Placement of new rip rap channel lining at outlet channel

• Monitoring Instrumentation modifications

• Restoration of all disturbed areas