how do i make trapezoid contour from raw data of three sets?

I have 4 points of a trapizoid and dZ for my third axes. the data is in three set

i would like to make a contour map of this from the minimum dz point and do it in levels of .1. i would also like to make a smooth surface from my three lines. please any suggestions as to a methof of doing this would be very helpful.

thank you