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Mike Boulay -9- April 11, 2011 <br />low-level groundwater contamination (hydrocarbons) detected in samples from <br />two of the four monitoring wells proposed for the site, but there is no mention of <br />the source of the contamination. Although coal operations do not typically <br />produce these types of contaminants clearly documented baseline conditions <br />and future monitoring for any increases in groundwater contaminants will be <br />important. This section should be revised to include background <br />information regarding the likely source for the contamination, describe how <br />baseline conditions have been established, and how future monitoring will <br />be utilized to detect any future increases in groundwater contamination <br />either on-site or migrating on-site. <br />CAM: Text has been added to pages 2.04-16 in order to address the possible <br />source of groundwater contamination. <br />13. Rule 2.04.7(2)(a) requires that the baseline surface water data show seasonal <br />variations in the quantity and quality of the surface water. However, only two <br />quarters of the baseline surface water data are presented in Exhibit 3 of Volume <br />II. Please submit additional baseline surface water data in compliance with <br />Rule 2.04.7(2)(a). <br />CAM: Please see revised Exhibit 3 providing third and fourth quarter monitoring <br />data. <br />14. Under Rule 2.04.7(2)(a) on permit text page 2.04-18, please expand on the <br />discussion of the Colorado River, including how the river might affect or be <br />affected by the loadout disturbances. <br />CAM: Please see revised pages 2.04-18,19 and 20. <br />15. Under Rule 2.04.7(2)(b), please add the flow data to surface water <br />monitoring station DS-CR in Exhibit 3 of Volume I. <br />CAM: Flow data has been added to DS-CR in Exhibit 3 for all four quarters. <br />16. Due to its proximity to the Colorado River, please describe in Section 2.04.7 <br />what the historical record is for flooding or having an elevated ground <br />water table in the permit area. <br />CAM: As stated in section 2.04.7, "it is unlikely that the ground water beneath <br />the proposed loadout facility is directly related to the Colorado River"; it is not <br />likely that flooding of the River will substantially raise the level of the <br />groundwater. The groundwater elevation is more likely to be affected by upland <br />irrigation users, or a large precipitation event. In addition, the mapped FEMA <br />floodplain elevation is over 800 feet south of the permit boundary as discussed