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2. Meteorological data, specifically, wind speeds and wind directions shall be documented before, <br />during, and after blasting activities. <br />a. Documentation of meteorological data shall include readings at 15, 10, and 5 minutes <br />before the blast, a reading during the blast, and readings at 5, L0, 15, and 20 minutes after <br />the blast to accurately represent wind conditions. <br />b. Blasting activities shall be prohibited when the wind direction is blowing from any region <br />in the south. Specifically, wind from the region between >90° to <270° magnetic north <br />compass readings. <br />3. Activities related to the loading of the shuttle-train coal cars shall be prohibited when wind speeds <br />exceed thirty (30) miles per hour. <br />In addition to the dust control measures addressed, a revised Air Pollution Emission Notice <br />(ADEN) shall be submitted to the Air Pollution Control Division (Division) within thirty (30) days of <br />receipt of this letter addressing the emissions of air pollutants related to the detonation of explosives <br />during blasting activities. Based on the Division's calculations using blast logs, documented by Buckley <br />Powder Co., and provided by Lorencito for the period from October 19, 2001 until December 31, 2001 the <br />Division believes Lorencito may have underestimated air pollution emissions. The Division calculated air <br />pollution emissions using EPA's emission factors listed in AP-42, Fifth Edition, Volume 1, Chapter 13.3, <br />Explosives Detonation (copy enclosed). Detonation of ammonium nitrate and fuel oil produces 17 pounds <br />of NOx and 67 pounds of CO emissions per ton of explosives, respectively. According to blast logs <br />provided, Lorencito has detonated over 300 tons of explosives producing 2.6 tons of NOx and 10.3 tons of <br />CO emissions from 44 blasts. <br />Enclosed are the instructions and documents required to be completed by Lorencito to self certify <br />compliance with the terms and conditions of permit O1 LA0642, these documents must be signed and <br />submitted to the Division by March 19, 2002. <br />If you have any questions please contact me. <br />Paul Carr <br />Environmental Protection Specialist <br />Colorado DeparL~rent ojPublic Health a~:d Environment <br />Air Pollution Control Division, Stationary Source Division <br />Office (303J 692-3250 <br />Fax (303) 782-0278 <br />Mail APCD-SS-BI <br />4300 Cherry Creek Drive Soutlt <br />Denver, CO 80246-1530 <br />Cc. Robert Jorgenson, APCD Supervisor <br />Chip Hancock, APCD Permit Engineer <br />