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J-2 Contracting Co.—DPG Pit— Technical Revision No. 1 Adequacy Review Response <br /> File No. M-2019-028 <br /> -8- <br /> dated August 26, 2019. The Division has not received the technical revision for the slurry wall <br /> design. Please submit the technical revision for the slurry wall design for the proposed Phase 2, <br /> 4 and 5 slurry walls. <br /> Response: The slurry wall design is included in the attachments. <br /> 16. During the original permit application review the Operator committed to submitting stormwater <br /> management plan (SWMP) from CDPHE. See Item #35 in the adequacy review response letter <br /> for the original application dated August 26, 2019. The Division has not received a copy of the <br /> approved SWMP issues by CDPHE from the Operator. Please provide a copy of the approved <br /> SWMP from CDPHE for the Division's file. <br /> Response: The approved permit from CDPHE is included in the attachments. <br /> 17. During the original permit application review the Operator committed to providing data from the <br /> groundwater monitoring wells for one year prior to the slurry wall construction. See Item #41 in <br /> the adequacy response letter for the original application dated August 26, 2019. The Division <br /> has not received the groundwater monitoring data. Please submit a copy of the first year of <br /> monthly groundwater monitoring data for the site at a minimum. <br /> Response: The monthly groundwater monitoring data for the DPG pit is included in the <br /> attachments and includes the first measurements through the last reading in August <br /> 2021. <br /> 18. During the original permit application review the Operator committed to incorporating the <br /> recommendation from ERC's Screening Report for Federal and State Listed Threatened and <br /> Endangered Species into the mining plan and committed to performing the recommended <br /> surveys within the specified timeframes, maintaining the recommended buffer zones during the <br /> specified timeframes and coordinating with CPW and USPWS as necessary. See Item #43 in <br /> the adequacy response letter for the original application dated August 26, 2019. Please confirm <br /> the Operator is following ERC's recommendations and state if the proposed revised Mining and <br /> Reclamation Plans alter the previous recommendations from ERC. <br /> Response: The Operator has been in contact with ERC regarding the recommendations <br /> prior to starting mining and during the current operations. ERC provided the attached <br /> response regarding the revised Mining and Reclamation Plans stating that there are no <br /> alterations to the previous recommendations. <br /> 19. During the original permit application review the Operator committed to not commencing with <br /> dewatering activities until ERC's report has been accepted, a determination has been <br /> completed by the Army Corps of Engineers and a copy has been provided to the DRMS. See <br /> Item #44 in the adequacy response letter for the original application dated August 26, 2019. The <br /> Operator submitted a copy of the USACE Wetland Determination letter to the Division on <br /> December 19, 2019. No additional response is required from the Operator. <br /> Response: Acknowledged. <br /> 20. During the original permit application review the Operator committed to not mining within 200 <br /> feet of the structures not owned by DPG Farms, LLC that are in the mining phases until the <br /> structure owner abandons and removes them from the mining phases. See Item #54a in the <br /> adequacy response letter for the original application dated August 26, 2019. Please provide and <br /> V 305 Denver Avenue—Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: 303-857-6224 <br />