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Welborn Sullivan Meck&Tooley&Leadville Sanitation 3 <br /> June 9,2023 <br /> strontium, thorium, BTEX and benzene. The permit requires only reporting for the <br /> previously listed metals so that the Division can review the data and develop potential <br /> discharge limits on future discharge permit renewals. <br /> Response: <br /> 1. UMC is responsible for surface as well as groundwater contamination. The Leadville Mill <br /> is also regulated by CDPHE and will be operating under a CDPS permit. The Mill must <br /> also comply with CDRMS water regulations. As such it is subject to the same <br /> regulations — as they apply to a process facility — as the WWTF. Required sampling by <br /> CDRMS (underground) and CDPHE (surface) are provided in Table 1 and Table 2. <br /> Note sampling is also performed for mercury (Hg). <br /> Table 1: CDRMS Sampling Requirements/Protocols <br /> Protocol Method&Description Anal tes Sampled <br /> EPA 200.7, Rev 4.4, Metals ICP Aluminum, Boron, Calcium Iron, Sodium <br /> EPA 200.8, Metals(ICP/MS) Antimony, Arsenic, Barium, Beryllium, Cadmium, <br /> Chromium, Cobalt, Lead, Manganese, <br /> Molybdenum, Nickel, Selenium, Silver, Thallium, <br /> Uranium,Vanadium,Zinc <br /> EPA 245.1, Mercury CVAA) Mercury <br /> MCAWW 300.0,Anions, Ion Chromatography Chloride, Nitrate as N, Fluoride, Sulfate <br /> MCAWW 351.2, Nitrogen,Total Kjeldahl Nitrogen <br /> MCAWW 353.2, Nitrogen, Nitrate-Nitrite Nitrate Nitrite as N <br /> SW846 9012A,Cyanide,Total and/or Amenable Cyanide <br /> SM SM2320B,Alkalinity Alkalinity, Bicarbonate Alkalinity as CaCO3, <br /> Carbonate Alkalinity as CaCO3, Hydroxide <br /> Alkalinity <br /> SM SM2540C, Solids,TDS Total Dissolved Solids <br /> EPA Nitrogen,Total Total Nitrogen <br />