2022-11-22_REVISION - M2015030 ‎(2)‎

• Permit No: M2015030
• IBM Index Class Name: Revision
• Doc Date: 11/22/2022
• Doc Name: Request For Amendment To Permit
• From: Asphalt Specialties CO
• To: DRMS
• Type & Sequence: AM2
• Email Name: ECS
• Email Name: MAC
• Email Name: AWA
• Media Type: D
• Archive: No

4
Chavers Mining Resource
DRMS Permit No.M-2015-030
Amendment No.2(AM-02)
November 2022
Page 9
(d) Backfill of material generated off-site will commence in 2022 and end at the
completion of Reclamation Phase 1 (estimated 2035 - see Section 6.4.5(2)(e)).
(e) The backfilled Site will result in a post-mining configuration that is
compatible with the post-mining land use(i.e., general agricultural)being
requested for approval by this Amendment No. 2 (AM-02).
(0 The material will be placed and spread in 1-to-2-foot lifts using haul trucks,
bulldozers, excavators, and/or loaders. Compaction will take place during the
filling process, as haul trucks and heavy equipment traverse over the fill.
(10)All mined material not compatible for off-site use(e.g., fines)will be backfilled to
prevent any release of unauthorized fine material to the surface drainage system.
(11) No unauthorized release of pollutants to groundwater will occur from materials
mined, handled, or used as backfill within the permit area. No toxic or acid producing
materials are used in the mining process.
3.1.6 Water — General Requirements: ASCI will minimize disturbances to the prevailing
hydrologic balance and water quality of systems (surface and groundwater)both during
and after mining and reclamation phases.
(1) Hydrology and Water Quality: ASCI will continue to comply with applicable
Colorado water laws and regulations to ensure no injury occurs to existing water rights
and maintain water quality standards of the Water Quality Control Commission
(WQCC).ASCI will continue to maintain the appropriate permits and plans(e.g.,CDPS
Discharge Permit, approved Substitute Water Supply Plans [SWSPs]) along with
replacement water lease(s) sufficient to cover out-of-priority depletions throughout the
mining and reclamation process.
(2)No earthen dams will need to be constructed.
(3) All surface areas, including spoil piles, will be stabilized to effectively control
erosion using appropriate erosion control measures.
3.1.7 Groundwater—Specific Requirements:
(1) The Site is located within Classified Area: City of Fort Lupton Wellfield, Weld
County (WQCC Regulation No. 42). However, due to only clean materials used as
backfill,no adverse impacts to groundwater quality will occur.
(2)Not Applicable- The Site is located within a classified area.
(3)Not Applicable- The Site is located within classified area.
(4) Due to only clean materials used as backfill, no adverse impacts to groundwater
quality will occur.
(5) Due to only clean materials used as backfill, no adverse impacts to groundwater
quality will occur.