…er liter Water None None None > 11 microns None None USGS use and no use by EPA 32281 Chlorophyll a >11u, calcd ug/l BIO Chlorophyll a greater than 11 microns, calculated as chlorophyll a (P32209) less chlorophyll a <11 um (P32275), micrograms per liter Water None None None > 11 …