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<br />• Table 7-6 Ambient Air Concentrations of Criteria Pollutants Observed at the Cb <br />Oil Shale Tract Site 023 Monitoring Station. <br /> TSP <br />(µg~m') SO, <br />(PPm) NO, <br />(PPm) O," <br />(PPm) CO <br />(PPm) <br /> <br />Year Annual <br />Geometric <br />Mean 2nd <br />Highest <br />24-hr Annual <br />Arithmetic <br />Mean 2nd <br />Highest <br />3-hr 2nd <br />Highest <br />24-hr Annual <br />Arithmetic <br />Mean 2nd <br />Highest <br />1-hr 2nd <br />Highest <br />1-hr 2nd <br />Highest <br />8-hr <br />1979 13.3 99.8 0.000 0.006 0.003 0.001 0.126 2.5 I.5 <br />1980 8.3 58.4 0.000 0.005 0.005 0.001 0.078 3.3 2.6 <br />] 981 14.3 86.2 0.001 0.006 0.007 0.001 0.079 1.6 1.6 <br />1982 7.6 42.2 0.001 0.008 0.005 0.001 0.073 0.5 0.2 <br />1983 6.0 34.7 0.001 0.005 0.004 0.001 0.062 0.12 0.09 <br />1984 4.6 25.5 0.000 0.005 0.004 0.002 0.069 0.21 0.04 <br />1985 7.4 29.1 0.001 0.007 0.005 0.001 0.226 0.069 0.052 <br />NAAQS 50 150 0.030 0.500 0.140 0.053 0.120 35 9 <br />The O~ NAAQS is not to be exceeded more than an average of once every 3 years. Year 1985 was <br />an unusual event. <br />7.6.1 Piceance Site <br />Plant communities occurring at the Piceance Site include the Sagebrush Association, <br />Grassland Association, Pinyon-Juniper Association, Chained Pinyon-Juniper <br />Association, Barren/Rock Outcrop Association, and Riparian Vegetation, as <br />classified by the BLM (BLM 1994). These vegetation types have been described by the <br />BLM as follows (BLM 1982, BLM 1994); the names of the corresponding vegetation <br />types, as classified by the U.S. Soil Conservation Service and used by the BLM in the <br />BLM Sodium Leases FEA, are shown in parentheses. <br />Pinyon-Juniper Association (Foothills Pinyon-JuniTerl <br />The Pinyon-Juniper Association consists of pinyon pine and Utah juniper <br />woodlands with an understory of Indian ricegrass, bluebunch wheatgrass, galleta, <br />and needlegrass. Shrubs include mountain mahogany, antelope bitterbrush, and <br />Utah serviceberry. Overstory varies from open to closed woodland, and understory <br />shrub and grass-forb productivity generally varies inversely with overstory closure. <br />This vegetation type apparently has a competitive advantage over other vegetation <br />types and is the climax association on xeric ridgetops with shallow soils. <br />• <br />American Soda, L.L.P. 7-31 <br />Commercial Mine Plan <br />August 18, 1998 <br />