In regards to the dirty dirt cars at Beacon Park in Allston,ma(BOSTON).Back in Conrail days, in about 1980,there was a large diesel fuel leak at the engine fueling racks.The oil seeped all the way to the Charles River for days or months before anyone knew there was a leak.It The river was about 150 to 200 yards from the fuel rack.The fuel rack to fuel engines had a 5 or 6 inch line which was fine,A small 2 inch line came off of these 6" lines and went underground to heat the engine house which was right beside the fuel rack.This 2 inch line could have been leaking for over a year before anyone knew about it.A new line was run overhead, but it was too late, the ground in that whole area was saturated with diesel fuel.Over time vertical corrugated steel pipes were put in,like a well,to monitor the ground water at multiple locations.A private contractor built a building with a large oil separator under the mass pike ramps.Home heating oil is the same as diesel fuel ,there was a large 50,000+- gallon oil tank that fed the fuel racks and heated engine house.I am sure Harvard university knew about this when they got involved with this property.Harvard endowment is up in the BILLIONS,so they can afford it.When this happened it was a good day, not to be the supervisor.Ido not know the soil conditions there ,but hopefully there is a layer of clay so the oil could only seep down so much.This was probably 4 or 5 times worse than the contamination in OHIO at the derailment money wise to clean up.