Scope of work Removal of asbestos sprayed coating to a car park ceiling slab and removal of windows containing asbestos cement board panels, asbestos containing mastic and floor tiles.
Methods Employed MAN Environmental Services Ltd were employed to carry out an asbestos removal project to Hereward Tower a tower block in the heart of Peterborough town centre, during a very cold and windy January of 2015.
The work required the full removal of licenced asbestos sprayed coating from the ceiling slab of an external carpark situated below Hereward Tower, the removal of non-licenced asbestos materials such as floor tiles and the removal of 166 window frames and associated asbestos cement panels and mastic sealant.
Sprayed Coating: Car Park Area The area involved was only partially protected by two walls on either side, the front and back elevations were open to the elements.
MAN installed timber frame work to those elevation, a doubler skin of polythene was attached and sealed using class 0 foil tape to either side of the framework and then marine plywood was attached to the external side and again sealed with expanding foam and foil tape. A water resistant bund was formed using absorbent spillage kits to stop egress of water from the uncovered parts of the car park when raining.
Generators were provided for all power requirements and were set up undercover on spillage trays and within a protective bund area for water ingress.
The NPU,s were sited at the end adjacent to the generators and within the same protective area.
The Hygiene unit was attached directly to the enclosure by use of a tunnel also incorporating a separate bag lock system.
The floor of the enclosure was two layers of polythene over a layer of correx over a layer of hardboard, all sealed with class 0 tape and expanding foam as required.
Work within the enclosure was carried out from small towers giving a suitable platform for the subsequent injection using a low pressure injection machine and multi needles, the injection was carried out at night and the area injected, checked and removed during the day.
When all of the sprayed coating had been removed it was obvious that the bitumen below would require removal by blasting to achieve the clients required standard.
The blast machine was set up outside and the blast hoses run into the enclosure through the bag lock. Trained operatives carried out the work again from the towers in specifically restricted areas, cordoned off from the remaining areas of the enclosure and a watchman was posted for each operative working to ensure their and others safety during the work.
The operatives had suitable blast protective leather gauntlet gloves and aprons and had removable visor protection, they worked in 15 minute shifts with a 15 minute break where the watchman swapped places. Hearing protection was worn at all times in the enclosure and negative pressure was fitted with additional pre filters both directly to the machines and on Roving head attachments. Personal air monitoring was carried out during the work and the average level of 0.54f/cmc was achieved.
The work was visited by the HSE during the blasting phase and no adverse comments were received. The client was more than happy with the end results and the area was handed back after independent inspections.
Window panels The window panels were removed using scissor lifts fixed cradles as the ground floor level around the tower block was a different levels and required different types off access on each elevation.
The glass was removed from the window panels and they were cut using reciprocating saws across the middle of the frame to reduce the windows to half size. Each half section was removed from the recess by two operatives one in the scissor lift or cradle by a trained access platform/cradle driver and one operative on the floor where the window is to be removed.
The cement window panels were removed on the respective floor in a respirator zone and all mastic cleaned off of the window and concrete recess.
The window frames were removed as scrap and the asbestos disposed of at a licenced disposal site.
Again the HSE were happy with our method and the work being carried out when they visited and the client gave us some fantastic feedback on our performance.