GENERAL52064 - Laserfiche WebLink

Home Browse Search

CHAPTERFOUR Responses to Public and Al~ency Commems Letter and Comment No. Response impact screening analysis). P-3.107 Background levels of hazardous air pollutants (HAPs) arcs likely to be negligible in the rural Project Area. However, potential FIAPs concentrations in the vicinity of the Pazachute Site would be evaluated before obtaining the required air pollutant emissions pernuts from the CDPHE-Air Pollution Control Division. Although minimal, background concentrations of HAPs in the general Project Area would be much less than concentrations in the vicinity of the processing plants and the potential for HAPs emissions from mining operations have been identified. Analytical results from the test operations have estimated the maximum emissions of BTEX compounds (HAP emissions) would be approximately 4 tons per yeaz at the maximum production rate of 1.4 million tpy. Most of these HAPs emissions are likely to be emitted during the cazbon dioxide stripping process at the Piceance Site. P-3.108 Noise generated when the Parachute Site was formerly in operation as an industrial site is expected to have approached 75 dB, which is normal for industrial operations. Currently the azea is surrounded b~~ agricultwal and light industrial operations. The I-70 corridor and the existing railyard are approximately 3 miles away, and the nearest residence is over one mile. No recent noise measurements have been made; however, the current noise levels aze expected to be consistent with the background for rural undeveloped/partially developed settings, i.e., approachuig 45 dB(A). However, the exact level of background noise at this site is not critical. Even if the background level was double the assumed 45 dB(A), because of the log scale for measuring noise, this "worst case" assurnption for background noise would be 48 dB(A). Based on this estimation, the calculated baseline noise level for the Pazachute Site is below the permissible Colorado noise standards for Residential zones [55 dB(A) daytime and 50 dB(A) nighttime]. P-3.109 The concern expressed in this comment is noted. The B1.M is awaze that additional cultural resources clearance surveys will need to be conducted. We do not concur with the assessment that the Draft EIS is inadequate because of this. It is not at all unprecedented for project. to move forwazd without all the cultural resources data having been collected. The project proponent, the BLM, and the State Historic Preservation Officer are currently working on a Programmatic Agreement that will stipulate requirements for additional surveys and treatment of known cultural resources, as well as a discovery plan for dealing with azry inadvertent discoveries during construction. 4-52