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COLORADO LEGACY LAND <br /> 10 totes=2,475 gallons <br /> Total primary chemical storage= 6,650 gallons <br /> Total secondary containment= 10,000 gallons <br /> 10,000/6,650 x 100%= 150.378% <br /> Exhibit U-Designated Mining Operation Environmental Protection Plan(Rule 6.4.21): <br /> Under Section 7.1,the operator states"the tanks are located within a lined,bermed excavation that serves Revised as requested. The text has been updated to state that lined bermed area under the tanks can contain up to 110%of the <br /> as secondary containment".Please provide additional details on the secondary containment located maximum storage capacity of the tanks with additional freeboard for precipitation. <br /> outside of the water treatment plant in which the backfill slurry tanks are stored,including whether it was <br /> 26 designed to contain at least 110 percent of the maximum storage capacity of the tanks with sufficient The secondary containment outside the water treatment plant is capable of storing approximately 22,000 gallons.The primary <br /> freeboard for precipitation. storage units that are housed inside the containment are 2 tanks capable of holding 20,000 gallons each.Standard operation of <br /> the water treatment equipment requires only one tank be in service at a time.The second tank does not hold water and is a <br /> redundant piece of equipment that is isolated from the system. <br /> 25,000/20,000 x 100%= 125% <br /> Emergency Response Plan (Rule 8.3): <br /> Rule 8.1 requires an operator to notify the Division,as soon as reasonably practicable,but no later than 24 Revised as requested. The text in Rule 8 has been revised to include this notification procedure. <br /> hours,after the operator has knowledge of a failure or imminent failure of any impoundment, <br /> embankment,stockpile or slope that poses a reasonable potential for danger to human health,property,or <br /> the environment,or in the case of a designated mining operation,any EPF designed to contain or control <br /> 27 designated chemicals or process solutions as identified in the permit.For the Schwartzwalder Mine,the <br /> Division would consider a failure or imminent failure of the waste rock piles,the water treatment plant <br /> (including the pump/treat regime that keeps the mine pool level below the regulatory limit or a loss of <br /> containment situation),or the bulkheads installed inside the Steve and Pierce adits a situation in which the <br /> operator would need to notify the Division in accordance with Rule 8.2.Please commit to providing the <br /> required emergency notification to the Division in accordance with Rule 8.2 in the event of a failure or <br /> imminent failure of the facilities listed above. <br /> Additional Item(s): <br /> 28 Please remember that,pursuant to Rule 1.6.2(1)(c),any changes or additions to the application on file in Thank you,comment noted. <br /> our office must also be reflected in the public review copy which was placed with the County Clerk and <br /> Recorder.Pursuant to Rule 6.4.18,you must provide our office with an affidavit or receipt indicating the <br /> date this was done.This" roof'should be submitted with your adequacy response. <br /> Conclusions regarding the hydraulic gradient are based on few data points;there are only three wells CLL responded to this comment within the last RTC submitted,e.g.,response to Denver Water#12. <br /> 1 across the entire site that are being used to monitor bedrock groundwater including one background well <br /> and two cross-gradient wells;we continue to recommend installation of an additional monitoring well. <br /> CLL did not update climate data for the region or provide analyses on potential impacts from increased CLL responded to this comment within the last RTC submitted,e.g.,response to Denver Water#4. AM-06 includes an updated <br /> flooding or other climate changes such as wildfires;the CSM should account for the full range of potential Emergency Response Plan(Rule 8)which discusses response to fires. As previously discussed in response to DRMS's comments <br /> natural conditions. the plant can be monitored remotely and in the event that Glencoe Valley Road is not accessible(e.g.due to flooding or wildfires), <br /> there is another access point through White Ranch Open space. This access point was previously used in 2013 when the site <br /> experienced heavy rains and flooding. <br /> 2 <br /> CLL believes the climate data provide in the CSM is appropriate for the site and consistent with current the National Oceanic and <br /> Atmospheric Administration's(NOAA) most recent data for Colorado. The following information from NOAA has been added to <br /> the CSM to discuss potential climate change impacts: <br /> "There is less agreement among the models about future precipitation change for Colorado, which is shown in the <br /> second row of images.The models are split on whether the future will bring increasing,decreasing,or similar-to-current <br /> PAGE 10 OF 12 <br />