PR> LK> rainwater                              6.2
PR> LK> pure water                             7.0
PR>Rain water on Maui may be 6.2, but in New England try down in the 5's.
   ^^^^^^^^^^^^^^^^^^
Depends on Pele's mood 8-) (volcanos can cause 'acid rain' too - just
ask the eastern Wa. wheat farmers who were ashed in after Mt. St. Helens
blew his top on the 18th of may 1980) Besides, shouldn't you be
complaining to the authors of the textbook I quoted from who should have
known that some of their approximations wouldn't be valid FOURTY YEARS
later 
Laird, in Washington (the STATE, not the political cesspool *g*)
 * SLMR 2.1a * State Tree of California, Oregon and Washington: Stump.
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