Suburban Sprawl Mystery Cache

Perth is growing at an amazing rate, with new suburbs popping up all the time. Can you identify the suburbs below in quiz night format?
You will need to convert each suburb into a number using A=1  Z=26 and then reduce it to a single number.
(There is an app for the iPhone that does it for you or you can try this web page  http://www.balmoralsoftware.com/dollar.htm  (although with this you will have to reduce the numbers yourself).

A  =  More than a boulder
B  =  Sir Edmund may make it his
C  =  A place of worship with property
D  =  A tall entrance
E  =  This high place sounds nice (5,8)
F  =  Sounds like the baby's bed is not too high
G  =  An achievement
H  =  Where Liz might leave her car
I  =  A shepherd
J  =  A twisting turning snake
K  =  A mountaineer
L  =  Near water
M  =  Bleached glue in a river basin
N  =  Don’t tell anyone about this haven
O  =  Black birds in a place of many trees
P  =  A very nice car to drive (7)
Q  =  This man did it!
R  =  Dress up ladies and join royalty here
S  =  Simon sang of this fair
T  =  An angry fruit
U  =  Liberated and in a warm place
V  =  Immature timber
W  =  A child of Superman
X  =  Where you might inter your house
Y  =  Hound of the……
Z  =  Pin and a hound's call

The cache can be found at

S31º4(C+M).(A+D-E)(B+G+H-N)(F+G+I+J-K-L-M)

E116º 0(B-O-H).(N-Z)(P+Q+R-S-T-U)(V+W+U-X-Y)

The box you are looking for is a large sistema container. There are certificates for the first 2 finders and a prize for the FTF of an unactivated Aussie Flag GC. There are finders’ cards for anyone who wishes to take one.