Dear Colleagues:
    I am interested in hearing about other folks' experiences with phosphate
testing.  We have been working at the former location of a general mercantile
for the past three years.  Our results from phosphate testing have varied
rather dramatically within the same Harris strats from year to year (and are
not simply a matter of inter-observer variation).
    Any thoughts?  Advice?  Do others find this testing to be useful?  Or not
so much?  I would be grateful for any insights.
Cheers,
Debbie Rotman