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1. Mark out the site and set out levels, lay a centre drain which will connect into soakaways a minimum of one every 100metres (this varies from site to site).
2. All drainage will be 160mm diameter perforated pipe and will be laid within trenches measuring 300mm x 300mm.
3. Trenches will be backfilled with 20mm clean stone.
4. The box of the gallop is excavated and sub-soil cut and filled to provide a level formation across the width of the gallop.
5. On sites with a clay soil type (or similar) a base membrane is installed to minimise the risk of contamination, or heaving, into the stone drainage layer.
6. A 150mm compacted thickness of 40mm clean carboniferous limestone is laid over the gallops area. We do not use a soft or oolitic limestone as this does not have the resistance to frost penetration and is susceptible to breaking down.
7. A 50mm thick 20mm open graded base course Macadam is then laid as a separation layer (or for a more cost effective alternative we can use 650gsm Membrane) between the drainage stone and the riding surface. This material is not a British Standard mix but one that has been developed by Martin Collins and the tarmac manufacturer, to allow surface water to penetrate quicker through this separation layer into the land drains below.
The picture above demonstrates how the porous macadam works…. This is a flooded field, which was draining via a cut gallop during construction.
8. The Martin Collins gallop surface, Activ-track, Ecotrack, Geltrack or Polytrack is laid to a minimum average compacted depth of 5” (125mm) on tarmac (or up to 7” on a membrane separation layer).
9. Finally the surface is finished with a Gallop Master.
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