…er liter Water None None None > 35 microns None None USGS use and no use by EPA 32278 Chlorophyll a >35u, calcd ug/l BIO Chlorophyll a greater than 35 microns, calculated as chlorophyll a (P32209) less chlorophyll a <35 um (P32272), micrograms per liter Water None None None > 35 …