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Another interesting model artifact is the high 03 predicted along the 1-70 corridor north of the proposed <br /> Project Area.This region has always been a"hot spot"for the CAMx and Community Multiscale Air Quality <br /> Modeling System photo-chemical models (even in the updated Intermountain West Data Warehouse <br /> 2011b platform), for reasons which are currently unknown. Although we suspect the area's topography, <br /> especially the rapid elevation gains along the Roan cliffs, along with the limits of the CAMx and WRF <br /> meteorological model resolutions may have something to do with it. Ultimately, it has been shown that <br /> the model tends to over predict 03 in western Colorado. Thus, the 03 results on face value should be <br /> considered conservative. <br /> 2nd highest daily average PM,o concentration 8th highest daily average PM2.5 concentration <br /> 2025 High Oil and Gas Scenario 2025 High Oil and Gas Scenario <br /> Total Total <br /> - F' <br /> 900 - 7-9 <br /> 00 <br /> i 600 <br /> 500 � 55 <br /> 300 35 <br /> 150 ». 25 <br /> 125 <br /> 100 15 <br /> 75 10 <br /> 50 <br /> 5 <br /> 25 <br /> 10 1 <br /> µfilm' µfilm' <br /> median= 20.1 µg/m' O max(105,75)=1045.2 µglm' median a 4.8 µglm' O max(31,25)=420.9 µglm' <br /> 0 min(115,160)= 4.1 pg.m O mir(120,178)= 2.2 pj.glm' <br /> 8th highest 1 hour daily max NO,concentration 4th High 8 Hour Avg Daily Max Ozone <br /> 2025 High Oil and Gas Scenario 2025 High Oil and Gas Scenario <br /> Tote I Total <br /> 400 120 <br /> 350 <br /> _� 300 110 <br /> i <br /> 250 100 <br /> 200 <br /> 90 <br /> 150 <br /> � 1 <br /> 100 '�i + _ 80 <br /> z� <br /> 71 <br /> — 40 - Ir <br /> rk <br /> 10 60 <br /> 30 <br /> t 50 <br /> — — <br /> ppb ppl� <br /> O max(31,25)( =437.4 ppb median 69 <br /> i O max(108.76)=119.7 ppb <br /> median= 3.2 ppb O min 1143 = 07) ppb, . = .fi ppb <br /> Q min(55,229)= 60 4 ppb <br /> Figure 2.2-7 Total Cumulative Impacts to the 2025 High Oil and Gas Scenario(Environ 2017) <br /> Dunn Ranch Area LBA and Mining Plan Modification 36 <br /> Technical Resources Report <br />