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Maintenance activities on refuse stockpiles — The source uses a Division -approved <br />method of calculating dozer hours of operation, based on historical hours per coal <br />production (see August 2011 O&M Plan — Version 02). The highest daily `hours of <br />operation' for the refuse stockpiles was 21 hours, occurring on 12/2/2011. This <br />value is below the 75 hours/day limit. <br />It was verified for all 'dozer hour limits' that the source is utilizing the calculation <br />methodology outlined in the approved O&M Plan. At the time of the inspection, the <br />source stated that this approved methodology provides a conservative estimate of <br />actual dozer hours of operation. <br />Attachment A Limits: <br />-Point 014 and Point 016: There is a 'truck hauling of coal' limit of <br />1,000,000 tpy (Point 014) from the storage stockpile and emergency stockpile. <br />There is also a truck haulage limit of coal from the ROM stockpile of 500,000 tpy <br />(Point 016). The source has not trucked any coal from the facility since September, <br />2010. Prior to ceasing that activity, the source's largest trucking of coal from ROM <br />stockpile was 85,629 tpy. The source also trucked material from silos (maximum <br />rolling 12 -month total of 423,728 tpy on Jan 2010), but it is unclear if this silo <br />material trucking is for Point 014, or whether this activity is limited in the permit. In <br />any case, it appears that both values are below the limits associated with truck <br />haulage as listed in Attachment A. <br />-Point 019: Throughput of ventilation air shall not exceed 3,000,000 cubic <br />feet per minute. Shaft #2 fans shall be restricted to one (1) fan operating at any <br />time. The source confirmed during the inspection that only one (1) Shaft #2 fan is <br />operated at a time. Provided records also verified that the source calculates <br />throughput of ventilation air on a rolling 12 -month average, with the highest <br />average of 1,899,163 cubic feet per minute occurring during the period of Feb 2009 - <br />Jan 2010. Since that time period, the source appears to operate with a rolling 12 - <br />month average ventilation air throughput around 1,350,000 actual cubic feet per <br />minute. These values are below the permitted limits for this Point. <br />Source is in compliance with all throughput and production limits listed in this <br />Condition. <br />7. Emissions of air pollutants shall not exceed the following limitations, and the specific <br />limits in Attachment A (as calculated in the Division's preliminary analysis): (Reference: <br />Regulation 3, Part B, III. A. 4) <br />Particulate Matter: 68.8 tons per year. <br />PM10 (Particulate Matter<10 µm): 60.3 ton per year. <br />Particulate Matter - Fugitive: 85.4 tons per year. <br />PM10 (Particulate Matter<10 jm) - Fugitive: 27.9 tons per year. <br />Compliance with the yearly emission limits shall be determined on a rolling <br />twelve (12) month total. <br />Notes: For AIRS IDs 051/0015/011, 012, 013, 019 & 020, Coal Processing <br />System: The permit holder shall calculate emissions as defined in <br />Attachment A, based on daily production and keep a compliance record <br />on site in order to demonstrate compliance with the above emission <br />limitations. Annual emissions shall be calculated based on the previous <br />twelve (12) months' emission data. These calculated annual emissions <br />2012 Air Pollution Inspection <br />0510015-INSP-2012.docx Page 15 of 30 <br />