2019-07-09_REVISION - M2004044 (30)

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i Jared Ebert July 8,2019 Page 8 of 18 Suitable habitat for plains minnow, suckermouth minnow and brassy minnow exists within the Brighton Ditch, Brantner Ditch, and Brighton Return (previously referred to as the "unnamed tributary to the South Platte River"). These ditches are located within the affected area; however, mining will not occur within any of these ditches as the limits of mining excavation is located outside these ditches. Aggregate Industries will obtain a Colorado Discharge Permit System (CDPS) Permit COG500000 and will discharge groundwater into the Brighton Return as part of dewatering operations for the site in accordance with COG500000. Al will comply with any monitoring and mitigation measures required for this permit. Impacts to the Plains Minnow, Suckermouth Minnow and Brassy Minnow are not expected. b. Please update Table 10 to indicate the fish species of concern will be monitored for and/or otherwise protected with the measures to be designed. As the un-named tributary is planned to be mined, this table incorrectly states this area will be avoided. Please see comment 25a. c. Prior to affecting this area, the Operator will need to conduct a survey to ascertain if species of Brassy Minnow, Plains Minnow and/or Suckermouth Minnow exist within the unnamed tributary. Please place a buffer zone around this tributary and commit to conducting a survey of the tributary prior to affecting land within the buffer zone. Please see comment 25a. In accordance with comment 28a, a buffer zone has been placed around all wetlands and other potential WOTUS (delineated features)within the mining excavation limits on Exhibits C2 through C5. Aggregate Industries will receive approval from the USACE prior to impacting area within the buffer zone. Although there is potential for the Brassy Minnow, Plains Minnow and/or Suckermouth Minnow to occur within the Brighton Return, impacts to these species are not expected. As such, Aggregate Industries does not plan to conduct surveys of the Brighton Return. d. Please update the Exhibit C-5 map to depict this buffer zone and add a section to Exhibit H that discusses the monitoring and potential mitigation measures that will be taken should these species be found during the pre-mining survey. The Division strongly encourages the Applicant to contact Colorado Parks and Wildlife when preparing the buffer zone, pre-mine survey and any potential mitigation measures. Please see comment 25a. Although there is potential for the Brassy Minnow, Plains Minnow and/or Suckermouth Minnow to occur within the Brighton Return, impacts to these species are not expected. Aggregate Industries will comply with any monitoring and mitigation measures required for the COG500000 permit for the discharge of groundwater into the Brighton Return. In accordance with comment 28a, a buffer zone has been placed around all wetlands and other potential WOTUS (delineated features)within the mining excavation limits on Exhibits C2 through C5. Aggregate Industries will receive approval from the USACE prior to impacting area within the buffer zone. Aggregate Industries—WCR,Inc 1687 Cole Blvd Suite 300 Golden,CO 80401