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ENFORCE22974
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ENFORCE22974
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Last modified
8/24/2016 7:32:30 PM
Creation date
11/21/2007 10:18:12 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996084
IBM Index Class Name
Enforcement
Doc Date
4/9/2002
Doc Name
(faxed) Response Letter
From
Greystone Environmental Consultants
To
CDOH APCD
Violation No.
CV2002001
Media Type
D
Archive
No
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Aar. 9. 2002 9;41AM . LORENCITO COAL 119 868 2111 No•3181 P• 3/10 <br />On the issue of scheduling blasting to occur 15 minutes before sunset, Lorencito suggests that <br />dusk occurs for an additiona120-30 minutes on average after sunset and that it is possible to <br />observe dust emissions during that period aRer sunset. Referencing the US Naval Observatory <br />sunrise sunset website, latto•//aa usno.naw.miUdata/docsJRS OneDaxhtml "twilight is the time <br />after sunset during which there is natural light provided by,the upper atmosphere, which does <br />receive direct sunlight and reflects part of it toward the Earth's surface". Personnel at Lorencito <br />have been able w observe dust emissions for 20-30 minutes past sunset..As an example, sunset <br />data generated from the above.referenced website for Friday February 22, 2002, puts sunset at <br />18:47 and end of civil twilight at 19:13, for a twilight time period of 26 nunutes.. Given this <br />ability to observe dust emissions for at least 15 minutes after sunset, Lorencito proposes that <br />each blast be scheduled to occur at or before sunset. <br />2. Meteorological data, specifically, wind speeds and wind directidns shall be documented. <br />before, during and after blasting activities. <br />a) Documentation of meteorological data shall include readings ate, 10, and 5 minutes <br />before the blast, a reading during the blast, and readings at 5, 10, 15, ex~29.minutes after <br />She blast to accurately represent wind conditions. <br />b) Blasting activities shalt be prohibited when the wind direction is blowing from aay-a <br />sroecified region in the south. Specifically, for the year 2002. blasting will be prohibited <br />when the wind is blowing from the region between ~'^.-, >140° to <225°. <br />(magneric north compass readings). The wind sector that prohibits b]astine during <br />subsequent years will be re-..evaluated annually. <br />Lorencito proposes that meteorological data be documented 10 and 5 minutes before a blast, <br />once during the blast and 5 and 10 minutes after the blast. <br />Because there Zre residences located to the north of the year-1 mining area and because <br />emissions may blow toward residences, lorencito has not been blasting when the wind is from <br />the south. However, Lorencito believes that it is possible Yo decrease the >90 ° to <270 ° wind <br />sector that would limit blasting and still not impact residences. Therefore, lorencito proposes a <br />>140° to <225° sector.for limiting blasting. This is with the center ofthe compass directions. <br />oriented along the northern boundary of the,year-1 mining area'(worst case)- The closest <br />residence to the northwest appears to be at a distance of approximately0.8 miles at 327°, <br />meaning that wind blowing from the southeast at 1,47° would intersect with the residence. <br />Additionally; wind blowing frdm 90° to 140° will blow toward areas currently being mined <br />and/or beyond onto property owned by Lorencito (approximately 3.2 xtiore Holes to the west}. <br />Therefore; the conservative 140° is proposed as the southeastern region maximum for restricting <br />blasting. <br />Additionally, with the center,of the compass directions ,priented along the northern boundary of <br />the year=l mining area, the school and a majority of residences are located approximately 0:66 <br />miles at 45 °. This means that wind blowing-from the southwest at 225 ° would. intersect with <br />Elie residences. ,Therefore, 225° is proposed as the southwestern region maximum for restricting <br />blasting activities. <br />
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