Start at 32.54.380, 117.03.740 and go between the houses to the open space behind the houses. Head up the hill from there.
At the posted coordinates, you will find the coordinates for the final cache location. One set is in the cammoed M&M tube, and another set is stuck on the sign post. Same coords in both sets.
If you see those contractors goofing off, playing loud music, swearing or otherwise breaking the rules, you let me know, now, y'hear!