The tender concerns the basement inspection, cleaning and repair and the technical cleaning.

The contract is divided into two lots

Lot 1: Basement inspection, cleaning and repair

Lot 2: technical cleaning

The architectural and mechanical inspection of concrete (drinking) water reservoirs and cellars, including the hygienic cleaning of the inside of the structure. Including carrying out concrete inspections according to the CUR72 in the drinking water cellars and reservoirs at Andijk PSA, Andijk WPJ, Bergen, Laren, Hoofddorp, Heemskerk, Hoorn, De Cocksdorp and Den Burg, Huisduinen and Wijk aan Zee. This includes carrying out small concrete repairs.

Hygienic cleaning of aquifer installations (at Andijk PSA, Andijk WPJ, Bergen and Wijk aan Zee). Aquifers are: raw water microsieves, PE installations, wispro installations, coagulation lanes, inlet collection tank, rinsing water treatment lines, rinsing water treatment cellars, flocculators, carbon filters, sand filters, supply and discharge channels and cascades.