2023-07-05_REVISION - M2021052 - Laserfiche WebLink

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Plan (SWSP)was filed on June 13, 2022. However, this language is not actually contained within the revised Exhibit G, Section 8.3. Neither is language stating that a Gravel Well Pond Permit has been applied for. Please update the narrative language and include application documentation for both permits until such time the permit is issued. Copies of the Gravel Well Pond Permit application and Substitute Water Supply Plan documentation are included in Attachment G. The narrative in Exhibit G, Section 8.4 has been updated to reflect that the SWSP application and gravel pit well permit application have both been submitted and received, with a reference to Attachment G. 25. Per Rule 6.4.7(5)The Operator/Applicant shall affirmatively state that the Operator/Applicant has acquired (or has applied for) a National Pollutant Discharge Elimination System (NPDES) permit from the Water Quality Control Division at the Colorado Department of Health and Environment, if necessary. Committing to apply for the permit prior to operations does not meet the minimum requirements of the Rules. Scott applied for coverage under the Colorado Department of Public Health and Environment (CDPHE) Water Quality Control Division's(WQCD)COR400000 Construction Stormwater Discharge Permit through their Colorado Environmental Online Services(CEOS)portal. See Attachment G for a proof of the online application. 26. Please state within the narrative section of Exhibit G the source and estimated volume of water to be consumed while washing of material (processing) per Rule 6.4.7(3). During Mining, Section 8.7.1, only addresses loss from evaporation from the pond, material trucked off site (which contains-4%water) and that used for dust suppression. Water consumption will occur while processing/washing of material. Also, amend Exhibit G,Table 3 as necessary. We did not separately account for demands for washing/processing,because those water usage volumes are already included in the estimate of water lost with mined aggregate for aggregate mined below the groundwater table. In determining demands,SGM referenced the guidelines from the State Engineer's Office dated April 1,2011, "General Guidelines for Substitute Water Supply Plans For Sand and Gravel Pits"(SEO Gravel Pit Guidelines). Item#13 of the SEO Gravel Pit Guidelines provides direction for estimating water lost with mined aggregate based on multiple factors(such as washed vs. not washed and mined above the groundwater table vs. mined below the groundwater table). Material that is mined below the groundwater table that has been washed is charged 4%moisture content by weight, because the entire 4%is a groundwater diversion. This is shown in the excerpt from the SEO Gravel Pit Guidelines below(Figure 1 of this document).