Dec 16th PSP Results from QTT: 30.9 micrograms and is BELOW the FDA limit Posted on: January 2nd, 2014 | Author: Virgil | Filed under: Community Window The results from the latest PSP tests done on butter clams from the Sand Point airport beach on December 16, 2013 had an reduced PSP toxin level of 30.9 micrograms and is BELOW the FDA limit of 80 micrograms. Courtesy of the Qagan Tayagungin Tribe