Specifications include, but are not limited to: Cleaning/vactoring of (1) the filter vault, (2) the influent manhole, (3) the recirculation tank, (4) the dosing pump vault, (5) the flow splitter manhole, and (6) the effluent manhole. The cleaning operation is to include the physical removal of all floating material, bottom sediment, grit, sludge and materials that have collected on the bottom of said structures. The numbers in this description correspond to red numbers on the attached plans. Sludge depths were measured and are as follows: 1. The sludge depth at the Influent Manhole on the west side of the influent tank was 3.5 feet and was very dense. 2. The sludge depth on the East side of the recirculation tank was 3.5 feet and was also dense. 3. The sludge depth in the flow splitter manhole depth was 2 feet and the bottom foot seemed to be lime. Lime that was put into the system at this location appeared to have thickened the sludge and make it hard to penetrate with the sludge sampler. Remove debris in sewer lines by means of hydro jetting and vactoring. Jetting shall include the 24” concrete line (A) from the flow splitter manhole to the effluent manhole, the 15” pvc line (B) from the flow splitter manhole to the influent manhole and the 18” line (C) from the dosing pump vault to the recirculation tank. Please see the attached plans for plan and cross section pages of the system. The letters in this description correspond to red letters on the attached plans.
