2018-11-1_PR Comm Packet - Laserfiche WebLink

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on the perimeter asphalt and grass surfaces, is feeding an excessive amount of water into the rink subgrade. The warmer winter months of recent years is also resulting in more mid-winter snow melt and even rain, which further contributes to the amount of water feeding into the rink subgrade. We strongly recommend that any future renovation improvements place a high priority on improved perimeter drainage, including an insulated grade beam located around all outside edges of the refrigerated slab and the expansion joint between the grade beam and the rink slab, providing a more sealed edge condition. This type of edge condition has been used successfully in many refrigerated outdoor rink projects (since Guidant John Rose Oval construction) and will minimize water access beneath the refrigerated slab and frost heave adjacent to the slab by vertically insulating and containing refrigeration beneath the slab. Once a more sophisticated edge condition is installed, the perimeter drainage system and pavement can be more effectively reconstructed to keep surface water draining away from the rink and into the perimeter storm sewer. In general, the expansion joints are all in need of some repair. We recommend a minimum improvement to the rink slab include reconstruction of all four expansion joint areas. We feel that this improvement would provide, at minimum, another ten years of service for the ice rink slab. The hairline cracking of the ice slab has become more significant over the years and, as discussed above, will need to be addressed at some point to maintain an acceptable surface for summer inline skating. Total reconstruction of the rink slab seems premature at this time and the recommended improvements outlined in the evaluation would postpone future reconstruction of the ice slab for 10-15 years. Rink Floor Insulation The rink slab was originally constructed with three-inch-thick extruded polystyrene below the refrigerated rink to control frost heave over the approximately four-month long skating season. The insulation has aged, but still appears to be controlling the frost heave under the slab. The areas of slab that currently heave are not due to the underperformance of the subfloor insulation. Rather the excessive water that flows under the slab, overwhelming the capacity of the subsurface drainage system, and backing water levels up until they meet the refrigeration slab and freeze are responsible for heaving. We do not recommend replacement of the insulation at this time, only spot replacement in areas where the expansion joints are reconstructed. Perimeter Paving The condition of the perimeter paving adjacent to the rink is badly degraded. The bituminous surface has significantly heaved and settled and otherwise been disrupted to the point where positive drainage away from the ice refrigeration slab over the paving has been compromised, and simply doesn’t occur adjacent to most areas of the rink. Pavement conditions are poor, particularly adjacent to the rink slab, with much of the surface breaking up. Poor perimeter drainage adjacent to the ice refrigeration slab has caused several failures of the refrigeration slab at the refrigerated expansion joints as described above. 191919