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HomeMy WebLinkAboutNC0000353_Meeting Notes 1999_19990319 Unimin/K-T Feldspar/Felspar Corporation Meeting March 19, 1999 Opening comments from Charlie Stover,Unimin-NPDES permit renewal in Dec. 2001. Wanted to meet to get DWQ ideas on Dept.'s renewal. Fluoride limits allocated#'s waited to approach and find out any changes in the permits. He also talked about data submitted to DWQ. Did some toxicity testing, fluoride toxicity testing is imprecise. Concerns: 1)knowledge of acute toxicity. Use studies on ceriodaphnia. Did acute and chronic study in past two months and sent conclusions. Existing standard is protective of the environment-overly so, standard could be increased. Acute and chronic toxicity—duplicated by two separate labs, ETT and Burlington. Chronic shows 8— 16 ppm failure of fluoride toxicity. Reports include lab sheets from labs, show acute and chronic toxicity info to address the area of acute to chronic results. Chronic to acute results 8ppm lowest failed in chronic,40 ppm lowest failed in acute. 7 ppm is protected, 1.8 ppm standard for NC. 2)Are any changes in fluoride calculations to be made in the permit? Feel that 1.8 ppm for fluoride is too restrictive for North Toe River. Want to know if fluoride would be ratcheted down Are we looking at the fluoride standard being reduced? What are DWQ intentions with the limits? Higher correction or lower correction? Unimin,Feldspar, and KT Feldspar can live with what they have right now. Not looking for higher poundage,don't want any reduction in existing poundage. Unimin have developed two new plants in the last couple of years,Asian market took some business. Any reduction,were there any discrepancies in calculations? DWQ will give written response to the companies and a copy of the Alcoa report by the end of April. Companies will correct typos and submit updated report to DWQ.