The coordinates given are not the coordinates of the cache. They are the coordinates of the San Diego Public Library, a good place to ponder the following:
34 31 18 5 34 53 40 26 34 34 22 65 12 16 45 28 1 57 10 11 1 17 19 34 29 3 26 5 63 52 22 17
22 9 41 40 17 44 23 57 38 52 32 1 25 5 40 29 34 12 9 45 11 22 64 18 23 32 5 4 26 55 63 22
17 54 32 1 20 28 32 1 1 10 44 23 6 19 30 22 22 40 34 43 35 38 51 31 42 43 57 22 1 6 65 36
57 65 33 1 58 29 22 17 1 30 1 29 53 28 17 1 30 22 26 42 60 50 10 44 23 14 28 32 22 22 45
58 29 34 57 16 42 13 66 24 35 40 50 29 17
916.3047/HANCOCK
The cache itself is a 4 x 4 x 2 tupperware container.
Good luck! Enjoy the puzzle and the hunt!