Didn't see any posts using the older version so here's my first pass at it. It was a little confusing that the stone paved area and it's contours had to remain undisturbed so hoping I understood it correcting.
Thoughts?
A World War II monument was erected on a slope in the city park in the late 1940’s. It consists of a stone paved area with an obelisk at its center. The park is surrounded by private properties.
1. Regrade the site so that water will flow around and away from the stone paved area.
2. The stone paved area and its contours shall remain undisturbed.
3. The existing light stands on either side of the monument and the two groups of existing trees shall not be disturbed.
4. The slope of the regraded portions of the site shall not exceed 20%.