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2018-04-17_REPORT - C1994082
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2018-04-17_REPORT - C1994082
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Entry Properties
Last modified
6/7/2018 6:36:30 AM
Creation date
4/18/2018 7:47:26 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Report
Doc Date
4/17/2018
Doc Name Note
2017
Doc Name
Annual Reclamation Report
From
Twentymile Coal, LLC
To
DRMS
Annual Report Year
2017
Permit Index Doc Type
Annual Reclamation Report
Email Name
RAR
Media Type
D
Archive
No
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SEDIMENTATION POND SURVEYS <br />SP is required to monitor sedimentation ponds for sediment storage capacities. Up through 2015, this <br />monitoring was conducted by physically surveying each pond each year. This schedule provided a <br />sediment yield history and gave advanced warning to operations personnel when sediment clean-out work <br />was needed. Also, SP visually inspects each pond, at a minimum, quarterly each year. During these <br />inspections, any significant observed change in sediment storage, or noticeable expansion of the sediment <br />delta at the inlet to the pond, are noted as conditions requiring pond maintenance. <br />Yearly sediment delivery to the ponds is considerably less than originally calculated, since significant <br />portions of these watersheds have now been revegetated. Given this consideration, a request was <br />submitted and approved to monitor sediment accumulations on a five-year schedule for ponds that flow <br />year-round and to visually inspect any other ponds. The results of the 2015 survey indicate that all ponds <br />have sufficient sediment storage as shown by Table 3, Sediment Pond Capacities. Additionally, all ponds <br />have been discharging in compliance with the approved NPDES/CPDS permit effluent limitations. It <br />should be noted that the measuring flume for NPDES 010 was replaced in August 2015 and the flume for <br />NPDES-012 was leveled and reset. <br />TABLE 13.3 SENEGA SEDIMENT PONDS - WATER CAPACITY TRENDS <br />I <br />Pond ID 9W <br />Required <br />Capacity' <br />Current Remaining <br />Water <br />Capacity'� <br />(ac <br />-.ft) <br />FF_ <br />Deci"i('714 <br />YEAR <br />2008 <br />2009 <br />2010 <br />2011 <br />2012 <br />20]3 <br />2014 <br />2015 <br />Y - 010 <br />3.08 <br />7.6 <br />7.6 <br />7.8 <br />8 <br />8 <br />7.7 <br />9.2 <br />9.2 <br />TR -37 <br />Y - 011? <br />0.99 <br />3.6 <br />3.6 <br />3.6 <br />3.6 <br />3.6 <br />3.7 <br />3.6 <br />3.6 <br />TR -37 <br />Y - 011A <br />0.633 <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />TR -37 <br />Y - 012 <br />0.767 <br />0.7 <br />0.7 <br />1.1 <br />0.83 <br />1.2 <br />1.3 <br />1.3 <br />1.3 <br />TR -37 <br />Y -012A <br />6.3 <br />6.3 <br />6.1 <br />5.6 <br />5 <br />4.6 <br />4.4 <br />4.4 <br />Y - 013 <br />1.325 <br />1 4.5 <br />1 4.4 1 <br />4.5 <br />4.4 <br />1 4.3 <br />1 4.5 <br />1 4.5 <br />4.5 <br />1 TR -37 <br />Y-014 <br />1.6 <br />10.5 <br />1 7.5 1 <br />7.6 <br />1 7.5 <br />1 7.5 <br />1 7.5 <br />1 7 <br />1 7 <br />1 TR -37 <br />(*) Required eveg 2yrs - next survy 2016 <br />(1) Based on SEDCAD rrsults for a 10y,/246rstomi event. <br />(2) Ruvaining capacity Gelory principal spilhvay or orifice. <br />(3) TR 37, page 134A.1 A.9 (stock pond) <br />STOCK TANKS & SURGE CONTROL STRUCTURES <br />There is currently one stock tank in the Yoast area, which is a permanent feature. No new stock tanks or <br />surge control structures were constructed in 2017. <br />WILDLIFE MONITORING <br />Wildlife monitoring was conducted in cooperation with Colorado Parks and Wildlife (CPW) during 2017. <br />The work included: <br />
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