When you pull up to the first location, look up and you will see two, three digit numbers on a small sign.
Using the first number on the sign, add 54, then subtract that number from the last three digits of the north coordinates.
Using the second number on the sign, add it to the last three digits of the west coordinates. Then subtract 298.
Final coordinates will read:
N 34 14.xxx
W 118 35.xxx