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land use application pending before the county proposes to continue this activity means that it <br />proposes to continue exceed established health based norms. <br />This certainly makes compatibility very hard to find, which makes the search for viable <br />alternatives even more critical. <br />PERTINENT FINDINGS <br />The air quality modeling reported was conducted based on several alternative sets of <br />assumptions. A key finding is that the Primary NAAQS for PM1Q are violated in each and all of <br />these scenarios. <br />The limit of the primary standard, the 24-hour PM10 NAAQS is 150 µg/m3. The report finds: <br />"A number of scenarios were analyzed to generate results from different traffic <br />levels,. model options, and dust control factors." Report at 2. <br />"For all modeled scenarios, the H6H concentrations at the five <br />residents/structures located cbsest to the unpaved section of County Road 120 <br />exceed the 24-hour PM 10 NAAQS..... Figures 3 through 7 present H6H 24-hour <br />PM10 concentration contours for Scenarios A through E, respectively. The figures <br />also present the predicted concentrations at the five residents/structures where <br />the impacts exceed the NAAQS. Figure 8 shows detail of the concentration <br />contours n our selected residences for Scenario D. The con centrotior+ ranges for <br />each scenario at the five resident/structure locations are detailed Below: <br />Scenario A (Figure 3) - H6H impacts range from 245 to 469 �tg/m3 <br />Scenario B (Figure 4) - H6H impacts range from 160 to 280 pg/m3 <br />Scenario C (Figure 5) - H6H impacts range from 302 to 571 uglm3 <br />Scenario D (Figure 6) - H6H impacts range from 195 to 340 tCg/m3 <br />Scenario E (Figure 7) - H6H impacts range from 384 to 679 pg/m3" <br />Report at 8. (emphasis supplied). <br />Further, <br />"The results indicate possible adverse health effects to these residents, as EPA's <br />primary PM10 NAAQS is designed to protect public health. An FPA publication <br />exploining the health effects from particulate pollution and an EPA fact sheet <br />containing information an the PM10 NAAQS ore attached to this document." <br />Report at 2. <br />It is worth noting that the range of assumptions in these scenarios was conservative and more <br />likely understates than overstates actual exposures: <br />