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I would attain the Water Samples anywhere from 1/2 the depth of the Thermoclyne, and obvious different water masses 6ft to 13ft. over reef eco-systems, where people swim daily.The Shelf, just before the drop-off the deepest spot, during high tide would be 16ft.I would collect the sample at 8ft. and Get Salinity and Temperature immediately, photograph the site, date and time, continue with the sample monitoring its Temperature and keeping it alive with aeration until delivery to labs.I appreciate your concern for this matter, and any suggestions would be welcomed. Positive only please.