2020-06-08_PERMIT FILE - C1994082 ‎(2)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 6/8/2020
• Doc Name Note: Tab G - Attachment G Sediment and Hydrology Supporting Data
• Doc Name: Initial Application Materials
• From: Seneca Property, LLC
• To: DRMS
• Section_Exhibit Name: Tab G Attachment G
• Email Name: RAR
• Media Type: D
• Archive: No

Table 8.Water quality data at NPDES Outfall 012 for the period of January 1, 2014- December 31, 2018
Flow pH,Field Oil&Grease Iron TDS,Lab Manganese Selenium Selenium*
Location Date N N TR N PD PD TR
GPM S.U. Y/N MG/L MG/L MG/L UG/L UG/L
NPDES12 1/9/2014 19.86 7.51 N 0.14 3350 0.42 1.1 1
NPDES12 2 13 2014 18.43 7.39 N 0.13 2930 0.8 0.8
NPDES12 3/21/2014 32.52 8.02 N 0.31 2520 0.6 0.6
NPDES12 4 8 2014 1 67.85 7.96 N 0.35 2150 0.13 0.8 0.9
NPDES12 5/19/2014 91.31 8.1 N 0.06 2660 2.2 2
NPDES12 6 182014 142.49 7.72 N 0.05 2750 1.8 1.7
NPDES12 7/17/2014 73.3 7.6 N 0.12 3020 0.21 0.3 0.7
NPDES12 842014 49.09 7.9 N 0.1 3000 0.8 0.8
NPDES12 9/12/2014 39.8 7.76 N 0.6 3190 0.9 1
NPDES12 10 14 2014 33.39 7.87 N 0.19 3210 0.1 0.8 1.2
NPDES12 11/1/2014 29.42 7.84 N 0.29 3430 1 1
NPDES12 1212014 21.03 7.99 N 0.13 3000 0.4 0.4
NPDES12 1/15/2015 33.46 8 N 0.27 3240 0.66 0.9 0.7
NPDES12 2 10 2015 137.2 7.93 N 0.37 2680 0.7 0.8
NPDES12 3/10/2015 18.9 8.46 N 0.2 2510 0.5 6.5
NPDES12 4 27 2015 59.29 8.11 N 0.14 2880 0.11 1.2 1.3
NPDES12 5/21/2015 90.05 7.5 N 0.06 2620 2 1.9
NPDES12 6 4 2015 98.49 7.64 N 0.13 3210 2.8 2.9
NPDES12 7/6/2015 70.1 7.6 N 0.25 3230 0.28 0.6 0.7
NPDES12 8 4 2015 54.5 7.87 N 0.27 3250 1.4 1.2
NPDES12 9/14/2015 32.8 7.85 N 0.5 3620 1 1.1
NPDES12 10 13 2015 30 7.75 N 0.24 3650 0.11 1.2 1.3
NPDES12 11/3/2015 27 7.79 N 0.29 3340 0.8 0.9
NPDES12 12 9 2015 24 7.74 N 0.21 3330 0.9 0.6
NPDES12 1/13/2016 23.61 7.46 N 0.17 3190 0.44 0.4 0.3
NPDES12 2 3 2016 23.56 7.59 N 0.12 3350 1.1 1.1
NPDES12 3/3/2016 24.97 7.53 N 0.1 3230 1.9 1.7
NPDES12 4 21 2016 180.4 7.45 N 0.26 1350 0.07 1.9 1.9
NPDES12 5/3/2016 98.74 7.68 N <0.04 2670 3.9 3.5
NPDES12 6 21 2016 55.2 7.7 N 0.06 3230 1.9 2.3
NPDES12 7/5/2016 109.2 7.48 N 0.06 3120 0.08 3.6 1.4
NPDES12 812016 83.3 7.94 N 0.11 3110 1 1.1
NPDES12 9/6/2016 77.85 7.76 N 0.22 3340 0.8 0.8
NPDES12 10 3 2016 66.52 8.01 N 0.13 3030 0.17 0.9 0.9
NPDES12 11/1/2016 45.39 7.87 N 0.48 3560 0.8 1
NPDES12 12 6 2016 45.02 7.88 N 0.21 3450 1.2 1.2
NPDES12 1/17/2017 44.87 7.81 N 0.38 3460 0.5 0.3 1
NPDES12 212017 44.59 7.86 N 0.12 3290 1.1 1
NPDES12 3/14/2017 44.96 7.98 N 0.24 2270 1.3 1.6
NPDES12 4 4 2017 77.86 8.13 N 0.22 2960 0.11 1.7 1.6
NPDES12 5/1/2017 77.73 8.08 N 0.14 3010 1.9 2.1
NPDES12 6 12 2017 73.2 7.92 N 0.14 3050 1.1 0.7
NPDES12 7/26/2017 58.4 7.99 N 0.12 3130 0.13 0.7 0.5
NPDES12 8 9 2017 52.4 7.98 N 0.18 3230 0.8 0.7
NPDES12 9/3/2017 32.7 7.89 N 0.2 3360 0.8 0.4
NPDES12 10 17 2017 25.8 8.06 N 0.18 3440 0.12 0.5 0.5
NPDES12 11/27/2017 29.3 7.84 N 0.28 3330 0.6 0.6
NPDES12 12112017 20.8 7.77 N 0.2 3570 0.3 0.3
NPDES12 1/2/2018 20.7 7.73 N 0.12 3600 0.81 0.4 0.6
NPDES12 2/13/20181 21.2 7.72 N 0.1 3150 3 0.5
NPDES12 3/1/2018 20 8.33 N 0.1 3320 3.6 0.6
NPDES12 4 23 2018 174.8 8.27 N 1.14 2820 0.08 7.5 2
NPDES12 5/21/2018 139.4 7.9 N 0.29 2970 1.5 1
NPDES12 6 4 2018 124.6 7.9 N 0.08 2930 0.9 0.7
NPDES12 7/3/2018 111.6 7.96 N 0.13 3190 0.08 0.6 0.9
NPDES12 8 8 2018 90.5 8.03 N 0.06 3190 18.9 0.4
NPDES12 9/4/2018 82.9 8.09 N 0.06 3260 3.6 0.3
NPDES12 10 16 2018 23.8 8.15 N 0.14 3230 0.2 6.1 0.3
NPDES12 11/19/2018 24.1 8.15 N 0.08 3430 0.7 <0.2
NPDES12 12/3/2018 24 7.76 N 0.09 3290 35.2 <0.2
NPDES Daily Max 1 6.5-9.0 10 Report Report Report 18 -
Monthly Avg. NA NA 1 Report Report 4.6
Yampa Segment 13e Standards-Acute 6.5-9.0 1 4.738 18.4
Yampa Segment 13e Standards-Chronic - 2.618 TM**
Agricultural Use Standards 0.2*** 20
Note
*Total Recoverable Selenium do not have NPDES monitoring requirements.
**A current condtions temporary modification is in place for the Segment 13e chronic selenium standard.
***The manganese agricultural use standard is only applicable to areas with acidic soils.These are not present at Yoast Mine.
Bold Analyte exceeds the NPDES limit or Agricultural Use standard