This is a letterbox hybrid because it contains a stamp, a pad, and a log. Please leave these items in the cache; they are not trade items. You will find the remnants of an old house at the posted coordinates. This gem was hidden among the underbrush until the Thomas Fire exposed it. You'll need to count bricks on various parts of the chimney to get the coordinates for the final.
Facing the front of the chimney:
A = the number of bricks used for the top row
B = the number of bricks used for the second row
Look into the top of the chimney
C = the number of bricks on the leading edge of the smoke shelf
The checksum for the items you counted is 19
The final is a gelato container, under a SPOR next to a pipe and a wooden block, at:
N 34 28.5B(C-4)
W 119 10.0(C-1)(A-B)