Auxiliary Dam Construction 2007

At Pail Factory BridgeAt Pail Factory Bridge Concord MA

The earthen Dam after tree removalThe earthen Dam after tree removal View from Higgin’s back yard

Cleared area near old spillway.

Spillway is cleared in preparation ofSpillway is cleared in preparation of installation of the Cofferdam

Installation of cofferdam

Diverting Water Away from Spillway g y p yto Main Stream Using Cofferdam in

Background

Diversion of water to main stream to beginDiversion of water to main stream to begin work on the spillway

Preparation of footings for new spillwayPreparation of footings for new spillway formwork plus installation of rebar

Installation of formwork and rebar forInstallation of formwork and rebar for new spillway dam and wing walls.

Installation of formwork for new spillwayInstallation of formwork for new spillway dam and wing walls

Grading earthworks adjacent to newGrading earthworks adjacent to new spillway

Wing walls of new spillway have beenWing walls of new spillway have been poured in stages

Grading of earthworks adjacent to newGrading of earthworks adjacent to new spillway, preparing for additional backfill

Installing riprap along earthworks and within new spillway

Preparing to remove cofferdam at newPreparing to remove cofferdam at new spillway site

Removing cofferdam and grading new riprapRemoving cofferdam and grading new riprap within spillway and along earthworks

New spillway completed and projectNew spillway completed and project closing for the winter

New spillway wearing a winter coatNew spillway wearing a winter coat waiting for Spring

What FollowsWhat Follows

• Work will commence on the main dam inWork will commence on the main dam in mid-summer of 2008, when water is at its lowest point in the pondlowest point in the pond.

• A pocket park is planned for the area to the left of the auxiliary damthe left of the auxiliary dam.

• Removal of non-native invasive plants will b i ith i t t thbegin with improvements to the area around the pond.