In Canada, we used the Canadian Runway Friction Index (CFRI) to help us determine if we can land on contaminated runways.
By assuming there was loose snow on packed snow of 3mm or less, considering that the runway length (from previous posters) is 6255 feet or 5880 feet with the displaced threshold and, assuming a landing distance (not factored) for a 737 of 3000 feet on a dry surface (I do not fly the 737, therefore this distance is an assumption), reading the CFRI chart we find that for these conditions, the CFRI would be between 0.1 and 0.4.
For a 3000 feet unfactored landing distance, we find that we need the following distances to stop the aircraft:
0.18 = 7920ft
0.20 = 7640ft
0.25 = 7060ft
0.30 = 6950ft
0.35 = 6220ft
0.40 = 5910ft
