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CNAPTERFIVE Dean EIS Revisions The initial segment of the pipeline corridor from the Piceance Site processing facility to the Greasewood Compressor Station will cross or follow existing drainages including Piceance Creek and Hatch Gulch. Shallow groundwater in alluvial sediments will likely exist along this portion of the pipeline. From the Greasewood Compressor Station, the corridor vends southerly about 7 miles along Collins and Stewart gulches, in which alluvial groundwater conditions may exist. Approximately 7 miles from the Greasewood Compressor Station, the ~~orridor moves from Stewart Gulch to uplands and trends along Barnes Ridge. The upland a~~eas aze underlain by the Upper and Lower Aquifers discussed in Section 3.1.1. At Davis Point, the corridor descends from the uplands into the Pazachute Creek drainage, which it follows to the Parachute Site final processing facilities. A summary of the USGS water quality information available for Lower Aquifer wells along the pipeline route is presented in Table 3.4-5. Ba:>ed on the limited USGS data, the water quality of the alluvium and Upper Aquifer along the pipeline route is similaz to that described for the Piceance Site. Water quality of the Lower Acluifer appeazs to be better along the pipeline route than at the Piceance Site. However, as discussed above for the Lower Aquifer, the depths and units monitored by these wells aze not known. Historic groundwater quality data were collected from wells in the Parachute Creek watershed from the mid-1970s to the eazly 1980s (COE 1985). These data indicate that the alluvial waters aze slightly alkaline, ranging in pH from 7.2 to 8.2. The major anions aze sulfate and bicarbonate. TDS concentrations range from 366 to 7,033 mg/l (COE 1985). The USGS database seazch identified one well along the East Fork of Parachute Creek (~~ppendix K). This well was analyzed for pH (7.3) and hazdness (580 mg/1) only. Page 3-24; Meteorology and Air Quality Visibility is considered an AQRV, and received special consideration in Section 169 of the Clean Air Act. In accordance with the Clean Air Act, the Environmental Protection Agency (EPA) has recently published regional haze re ations, designed to protect the visual resources in the certain National P:~rks and Wilderness areas. The Piceance Creek Basin and Parachute Creek valley are Class II air quality areas, as are most regions of the state. Class II attainment azeas under PSD regulations have specified allowable increases (increments) of pollutants above legally defined baselines (background that may never be exceeded. These areas aze also subject to state and/or national ambient stmdazds. Class II PSD increments and applicable state and/or national ambient air quality standards (NAAQS) aze listed in Table 3.5-2. Class I azeas (Figure 3.5-2), which have ~:~y siaAdafds smaller PSD increments, aze also located in the region. These include the Flat Tops and Mount Zirkel Wilderness Areas, which aze closest at 41 miles (66 km) acid 89 miles (143 km), respectively 4~ess~.ulaclr-aFe • . The Mazoon Bells Wilderness Area is 50 miles (80 5-16