Close to the posted coordinates you will find an information kiosk. Use it to get the final.
N 49 06.ABC W 122 54.DEF
A = Briarwood Trail, second number + 1
B = Gravity Bowl - Canyon Trail, first number + second number
C = Pinewood - Canyon Trail, third number
D = Briarwood Trail, second number
E = Upper - Lower Trail, first number
F = Upper - Lower Trail, second number
A + B + C + D + E + F = 35