2024-08-02_REVISION - M1992051

• Permit No: M1992051
• IBM Index Class Name: Revision
• Doc Date: 8/2/2024
• Doc Name: Request for Technical Revision
• From: Langston Concrete Inc
• To: DRMS
• Type & Sequence: TR3
• Email Name: JLC
• Email Name: AME
• Email Name: EL1
• Media Type: D
• Archive: No

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LANGsTgN
CONCRETE INC.
impoundments will exist on site." We are going to need to change this narrative to include the
impoundment as a settling pond. As well as add the portable wash plant facility.
Water for washing procedures will be purchased from Evraz and come from the Minnequa Canal
on the North East side of the permitted boundary. (Please see the attached water lease agreement
from Evraz Inc.) We plan on adding a pump at the canal location capable of pulling water from
the canal and also pushing it to the wash plant location. The water line will run into the permitted
property on the North East corner and across the pit floor in a South West direction. We plan on
installing everything we can underground to assist in vandalism/theft prevention as well as
freezing problems. The pump will be an all-inclusive set up and be mounted on a skid. The
suction line will plumb into it on the canal side and the push line will hook up and run
underground to the South from there.
Please refer to the attached, exhibit D- Mining Plan Map, for the proposed location of the
process-water ponds. As well as the location of the water line entry into the permitted property.
In addition to the impoundment, we have added three concrete structures for the wash plant. One
is a set of walls to be used as a loading ramp to load the surge bin that will feed the wash plant.
(This wall set is very similar to the set of walls we added for our screening plant a few years
ago.) One is a concrete slab the wash plant will sit on to cut down on mud & excessive settling of
the wash plant structure. We want to be able to keep the plant clean and tidy on a daily basis, so
having a concrete slab underneath the chassis of the portable wash plant was the best solution we
could come up with to allow personnel to access the area on foot and with a skid loader to clean
the area around the facility. We feel this will also cut down on safety related issues that may
arise from the facility being under constant water intrusion. This area is also conveniently
located just to the South West of the settling pond. We have graded the area to drain all water to
the North East for capture of excess water coming off the plant and into the pond to be
recirculated through the wash facility. This will cut down waste and the potential for run-off.
And the last structure is a concrete slab for the wash plant control house to sit on. This was done
for ease of leveling the control house since it is a van trailer and overall cleanliness of the plant.
We plan on leaving these structures in place once the mine is reclaimed in full. Please refer to the
attached Exhibit D Industrial Site Master Plan to reference the lay-out of the proposed post
mining land use. The location of the new wash facility is precariously located somewhere right
on the line between area A and area C. Area A is meant to be a retail yard. And area C set up to
be an"industrial area." We feel that once the process of extracting the C33 sand has subsided,
the concrete structures we built for the wash plant can be purposeful for either storing rock on,
possibly setting some kind of sales store front on, a customer load out station, or something of
the nature. There is some future value in leaving them there.
CoIVcsl rf INC.
902 South Union Street Florence, Co. 81226 [phone] Office [phone] Fax