Case Studies: Manhole Inspection and Rehabilitation

PROBLEM / Recently, Washington’s Lakehaven Utility District restored 70 precast concrete manholes (860 vertical feet) that were exhibiting medium to heavy deterioration with exposed aggregate. Having completed various projects throughout the past three years for the Lakehaven Utility District, including 102 manhole rehabilitations, applicator Pro-Vac had the extensive experience necessary for a successful manhole rehabilitation.

SOLUTION / Prior to surface preparation, Pro-Vac took measures to protect the flow lines, then removed all material from the inside of the structures and pressure washed the interior. On the heavily deteriorated structures, Epoxytec’s Silicate, a cementitious base coat, was applied to create a smooth finish. Once cured, the structure was pressure washed again, and CPP Sprayliner was applied at 120 mils.