Sullivan's Meander Multi-cache
tiddalik: orphaned and unmaintained
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Difficulty:
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Terrain:
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Size: 
(regular)
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This cache is a great chance to stroll along Sullivan's Creek at the Australian National University.
1. At the first location, you’ll need to find out how long Sullivans Creek is.
Multiply the (two digit) length by 4 and then subtract it from the last three digits of the initial South coordinate. Use this new South coordinate and the initial East coordinate for the location of stop number 2.
2. At this stop, you’ll be able to find out what year William Sullivan purchased Springbank (we’ll refer to its digits as: ABCD). Now multiply AC by 385 to get EFGH.
Stop number 3 is at:
S35 16.DAB
E149 0E.FGH
3. Stretch and chill out here while you contemplate your attack on the final location; but beware of ducks!
PO Box = ABC
PostCode = DEFG
Phone = HIJKLMNOPQ
GZ = S35 (A)(Q).(A-B)(P)(D+A) E149 0(E).(E)(I+J)(D+K)
4. The cache is a 1.2l Sistema container. Please be careful to return the cache to the hiding place and not to damage the area. Oh, and try not to be _too_ obvious 
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(Many thanks to Mr. Darcy for the new container and replacement clue for waypoint 3!)
Additional Hints
(Decrypt)
Gur pnpur vf whfg haqre gur onex ng gur onpx bs gur xvaqn qebbcl gerr.