2019-08-29_PERMIT FILE - M2019028 (3)

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RE: J-2 Contracting Company-DPG Pit-Permit No. M-2019-028 I I2(c)Permit Application Adequacy Review No. 1 Response 8126119 -6- site entrance roadway, haul roads, stockpiles, processing areas, settling ponds, a recharge pond, and an overflow pipe from the recharge pond that are outside of Phase 1. Prior to or during the initial mining of Phase 1 a slurry wall will be installed around the perimeter of Phase 1 and extend to Phase 2. The estimated time for mining Phase 1 is approximately 4 years. The operator is proposing to mine Phase 2 second that is 24.08 acres and during this mining there will be the same 65.4 acres disturbed that were in addition to Phase 1's 27.15 acres for a total of 104.61 acres that will be the maximum disturbed area and a Technical Revision will be requested prior to mining into Phase 2. The estimated time for mining Phase 2 is approximately 3 years and 6 months. The operator plans to mine Phase 3 next and prior to mining Phase 3 a slurry wall will be installed around the perimeter. Phase 3 is 48.69 acres and there will be 102.07 acres disturbed as the areas for Phase 1 and 2 will be part of a reclaimed reservoir and likely released when Phase 3 mining starts. The stockpile areas will move to the bottom of Phase 3 after the southern portion of Phase 3 is mined. The estimated time for mining Phase 3 is approximately 10 years. The operator plans to mine Phase 4 next and prior to mining Phase 4 a slurry wall will be installed around the perimeter. Phase 4 is 40.43 acres and there will be 70.16 acres disturbed as the area for Phase 3 will be part of a reclaimed reservoir and likely released when Phase 4 mining starts. The stockpile areas will be in Phase 4 and move to the bottom of Phase 4 after the southern portion of Phase 4 is mined. The estimated time for mining Phase 4 is approximately 8 years and 5 months. The operator plans to mine Phase 5 next and prior to mining Phase 5 a slurry wall will be installed around the perimeter. Phase 5 is 33.76 acres and there will be 53.64 acres disturbed as the area for Phase 4 will be part of a reclaimed reservoir and likely released when Phase 5 mining starts. The stockpile areas will be in.Phase 5 and move to the bottom of Phase 5 after the southern portion of Phase 5 is mined. The estimated time for mining Phase 5 is approximately 7 years and 4 months. Exhibit E- Reclamation Plan (Rule 6.4.5): 24) The operator provided a table showing the estimated reclamation acreages per final land use, including for reservoir water surface, access roads, and reclaimed vegetated land and undisturbed land. Please revise this table to differentiate the acreages for reclaimed vegetated land from undisturbed land. Response: The areas of land will all be disturbed so the areas that were shown or described as undisturbed have been removed from the text. The table will remain the same as all areas that are disturbed that are not reservoir water surface or access roads will be reclaimed vegetated land. 25) Please provide the design specifications and quality assurance and control plan for the slurry wall enclosure to be installed under the proposed maximum disturbance and bond scenario. If this information is not available at this time, please commit to submitting a Technical Revision with this information prior to construction of the slurry wall. Additionally, please commit to submitting a final construction report for the installed slurry wall enclosure, including the results of any post-construction testing and as-built drawings. Response: The slurry wall liner for Phase 1 has not been designed yet; however J-2 Contracting Company commits to submitting a Technical Revision with the design information prior to construction of the slurry wall liner. J-2 Contracting Company commits to submitting a final construction report, results of the post construction leak testing, and as-constructed drawings for the slurry wall liner. V, 305 Denver Avenue-Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax:303-857-6224