2020-10-27_PERMIT FILE - C1981035 ‎(22)‎

• Permit No: C1981035
• IBM Index Class Name: Permit File
• Doc Date: 10/27/2020
• Section_Exhibit Name: KII Appendix 16 Dunn Ranch LBA Technical Resources Report
• Media Type: D
• Archive: No

8th highest daily average PM,.,concentration
2025 High Oil and Gas Scenario
2nd highest daily average PM10 concentration (A2)New federal O&G+new Mining in CO
2025 High Oil and Gas Scenario
(A2)New federal O&G+new Mining in CO
52
+ 4,8
44 i
44
40
36
T 3.6
32 ' + -. it - —
L_ - &2
28
, •)�.2.8
24 + 2.4
_ - 20 2
I1.6
i
8 II 11 0A
- 04
faglm
median 0.0 µglrna O max(87,19 8) 52.6 µglm' median 0.0 .gmO maxp6.19 1) 6.3 uglm'
�) min(163.1)= 0.0fg1ma O min(184,1)= 0.01cglm'
8th highest 1 hour daily max NO,concentration 4th High 8 Hour Avg Daily Max Ozone
2025 High Oil and Gas Scenario 2025 High Oil and Gas Scenario
(A2)New federal O&G+new Mining in CO (A2)New federal O&G+new Mining in CO
r 60 8
52
48
44
_.40 _
36
32 4
28
24 -
i•
20i -
12 `
- I
ppb _ LIph
median= 0-0 ppb O max(79,183)= 64.2 ppb median= 0-0 ppb O max(78,190)= 8.7 ppb
Q min(214,16)- 0.0 ppb Q mEn(3,160) 0.0 ppb
Figure 2.2-6 Contribution to the 2025 High Oil and Gas Scenario(A2) New Federal O&G and Mining
(Environ 2017)
The plots in Figures 2.2-7 and 2.2-8 show the maximum modeled concentrations and the expected
changes from future emissions relative to the base year. As can be seen, most of the analysis area sees
relatively modest decreases or no changes to 03 formation potential. Particulate matter impacts are
mostly confined to the urban areas in Colorado and can be attributed to the expected population
increases projected to occur (which have occurred steadily since the CARMMS base year). Interestingly
these areas also project some of the largest drops (undoubtable due to tighter mobile source standards).
Dunn Ranch Area LBA and Mining Plan Modification 35
Technical Resources Report