2013-01-25_REPORT - M1992069 - Laserfiche WebLink

Home Browse Search

1.8 Achievement of Performance Standards A discussion of mitigation performance is contained in Appendix 1. 1.9 Dates of Recent Corrective or Maintenance Activities since Previous Report An ongoing weed management program is being maintained for all areas throughout the site to control invasion into wetland development areas and promote greater success of wetland vegetation. Weed species targeted in 2011 included kochia, bindweed, tamarisk and Russian olive. As noted in the 2010 report and re- iterated in Appendix 1 of this report, much of the F Street site was inundated with water from the Poudre River flood event on June 15, 2010. Impacts from the flood event to specific areas within the F Street Mine property are described in those reports. Although flood waters receded throughout the course of 2010 and early 2011, significant run -off coupled with heavy rain events in early June, 2011 resulted in flooding along the Poudre River again. In order to prevent further damage from the 2010 flood event, both to the F Street site as well as surrounding and downstream properties, the City of Greeley and Boyd Freeman Ditch Co. diverted flood water from the river into the site. This was a controlled diversion that filled the ponds and again inundated wetland Area A. In early August, 2011, Boyd Freeman Ditch Co. began pumping down the water level at the site in order to allow repair of the ditch and slope damage that had occurred in 2010. This work was completed early in 2012. Site conditions as a result of the flood conditions from both the 2010 and 2011 events again prevented progressing of any other corrective or maintenance activities beyond the weed management efforts noted above during 2011. 1.10 Recommendations for Corrective or Remedial Action The Appendix 1 Walsh report discusses the continuing impacts of the June 15, 2010 flood event and indicates that it is still not clear how those impacts will affect long -term development at the site. As noted in the Walsh summary, it is also difficult to predict where water levels will eventually stabilize, particularly as on -going de- watering activities on properties immediately adjacent to the north continue to lower water levels at the F Street site. Ongoing weed management throughout the site is ecologically beneficial. However, specific identification of and recommendations for additional remedial actions to designed mitigation areas is still uncertain and will be difficult to ascertain until the site and surrounding land uses stabilize. Aggregate Industries -WCR 3 F Street Mine Site - 2011 Annual Report (File # 199280589)