At WP1 you will find a large sign.
C = # letters of first word
A = last digit of station #
L = # times the letter B occurs on sign
F = station # minus 77
I = first digit of year established (Cal Fire)
R = # letters in 4th word
E = first digit of station #
Final at
N CC LL.(A-I)LL
W IIA (A-I)E.IRR