During heavy rain, a section of a mountainside measuring 5.1 km horizontally, 0.78 km up along the slope, and 0.95 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 1.1 km x 1.1 km and that the mass of a cubic meter of mud is 1900 kg. What is the mass of the mud sitting above a 3.6 m2 area of the valley floor?