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2019-09-10_REVISION - C1994082
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2019-09-10_REVISION - C1994082
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Last modified
1/19/2021 3:57:43 PM
Creation date
9/10/2019 10:43:06 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1994082
IBM Index Class Name
Revision
Doc Date
9/10/2019
Doc Name
Application
From
Seneca Property, LLC
To
DRMS
Type & Sequence
SL7
Email Name
RAR
JDM
Media Type
D
Archive
No
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Spoil Springs <br /> Four spoil springs are actively monitored at the Yoast Mine. Spoil Spring 1 (YSSPGI), located <br /> above the old haul road culvert crossing Annand Draw, and Spoil Springs 3 (YSSPG3) and Spoil <br /> Spring 4, located above NPDES Outfall 012, are within the Sage Creek Watershed(see Map I <br /> and IB). The post-mine land use of the reclaimed parcels in this Phase III bond release <br /> application are designated as livestock grazing and wildlife habitat. Therefore,the water quality <br /> data collected from these springs are compared to the Agricultural Use surface water standards as <br /> established in CWQCC Regulation 31. A single exceedance of the agricultural use selenium <br /> standard occurred at Spoil Spring 3 (YSSPG3)in 2015 (Table 16). This spring has been <br /> monitored annually since 2005 (n: 14) and no other sample has exceeded the Agricultural Use <br /> Standard. The dissolved selenium in the three samples collected since (2016—2018)has not <br /> exceed 2 µg/L. <br /> No other agricultural use surface water quality standard was exceeded at Spoil Spring 3 in 2014 <br /> —2018. There were no exceedances of any of the agricultural use standards at Spoil Spring 1 or <br /> Spoil Spring 4. <br /> C.J Permit Requirements of the Colorado Department of Public Health& Environment(CDPHE) <br /> The five outfalls at Yoast Mine are permitted under CDPHE Permit No. CO-0000221. Four of <br /> the five outfalls receive drainage from the Phase-III request area. Outfalls 010 discharges to <br /> Armand Draw which is a tributary to Grassy Creek and Outfalls 012, 013, and 014 discharge to <br /> unnamed tributaries to Sage Creek. Outfall 011, located on the southeast end of the permit, <br /> discharges to Grassy Creek. Although it does not receive drainage from any of the Phase-III <br /> request areas a description of its water quality is included in this submittal. Tables 6— 10 include <br /> analytical results for samples collected from the five outfalls between 2014 —2018 and a <br /> comparison against the NPDES limits and CWQCC surface water quality standards. <br /> Between January 1, 2014 and December 31, 2018 there were no exceedances of the NPDES <br /> limits at the five outfalls. Two of the samples from Outfall 012 indicated an exceedance of the <br /> daily max dissolved selenium NPDES limit(18.4 µg/L/L),however in both instances the total <br /> SL-7 - 42 <br />
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