2020-06-15_PERMIT FILE - M2020007

• Permit No: M2020007
• IBM Index Class Name: Permit File
• Doc Date: 6/15/2020
• Doc Name: Adequacy Review #3
• From: DRMS
• To: Environment Inc.
• Email Name: ECS
• Media Type: D
• Archive: No

r. O'Brian.................Environment In.c.
May 14, 2020
Page 2 of
riverside pit walls to provide adequate protection for the gas/oil line(s) it contains in the event it is overtopped by
a flood event. Please acknowledge.
As previously stated, DRMS could review sound arguments to modify those requirements on a site-specific basis,
but there will need to be sufficient hydrologic/engineering justification provided to do so.
Please modify the mining and reclamation plans and maps as needed to depict the appropriate berm widths for the
lateral berm, provide the appropriate designs, and show the locations for the necessary armoring on the
Reclamation Plan Map. Costs for all pitside/berm protection will also need to be included in Exhibit L.
EXHIBIT F-Reclamation Plan Map (Rule 6.4.6):
Please show the locations of proposed pit armoring in Phases 1 and 2, as well as the lateral berm between phases,
as described above.
EXHIBIT G-Water Information (Rule 6.4.7):
DRMS acknowledges the permittee's commitment to conducting the required baseline well testing for quality and
yield prior to installing slurry walls, dewatering, or exposing groundwater within 200 feet of the well, if the well
owner allows it. DRMS also accepts the proposed plan provided with the following clarification. If the permittee
wishes to place a limit on the amount of time the well owner is given to respond before considering a lack of
response a denial of access, the minimum time allowed for a response shall be no less than 30 days, and this
limitation shall be clearly stated in the letter sent requesting access to conduct the well testing. The access letters
should also be sent by certified mail or another trackable method so that delivery to the well owner can be
verified. As previously stated, the McPeek well will need to be tested prior to the commencement of mining in
Phase 1 A.
EXHIBIT L -Reclamation Costs (Rule 6.4.12):
All information necessary to calculate the costs of reclamation must be submitted and broken down into the
various major phases of reclamation. You must provide sufficient information to calculate the cost of reclamation
that would be incurred by the state. Based on the information provided for the phased mining DRMS suggests the
following breakdown for calculation of the required bond at this time:
Phases 1 a/2a— Cost to:
■ backfill each phase excavation to original grade after mining at 3:1 slope;
■ replace 10"topsoil;
■ prepare disturbed areas for crop planting the following season or revegetate with
provided seed mix.
Phases 1 and 2—Cost for:
• 100%installation cost for slurry walls if groundwater will be exposed prior to obtaining
provisional approval of slurry wall from SEO - Slurry wall bonding may be reduced to
20% of total cost when provisional approval by SEO is obtained prior to exposing
groundwater;
• final grading for pit slopes which have been mined at a 3:1 slope;