2018-08-08_HYDROLOGY - M1986015

• Permit No: M1986015
• IBM Index Class Name: Hydrology
• Doc Date: 8/8/2018
• From: DWR
• To: DRMS
• Email Name: ERR
• Media Type: D
• Archive: No

Mr. Paul Bruss, P.E.
August 8, 2018
Page 2 of 7
Phase 2, and 5.0 acres in Phase 7), dust control, water removed with the mining product, and
filling of the Phase 1 pit resulting from the planned cessation of dewatering to begin on
August 1, 2018.
Well permit no. 80662-F corresponds to Phases 1 and 2 and limits that portion of the
operation to evaporation from 31.0 acres of exposed water and 150.7 acre-feet annually (21.4
acre-feet annually corresponds to dust control). Well permit application receipt no. 3687189
was received by this office on July 5, 2018, and will be evaluated subsequent to approval of
this SWSP. Well Permit No. 75997-F corresponds to Phase 7 and limits that portion of the
operation to evaporation from 5.0 acres of exposed water and 29.4 acre-feet annually (4%
water content by weight of 1,000,000 tons) of water removed from mined material (or the
amounts covered under a Water Court approved plan for augmentation or SWSP approved by
the State Engineer, whichever is more restrictive).
In accordance with the letter dated April 30, 2010 from the Colorado Division of Reclamation,
Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the
requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the
protection of water resources. The April 30, 2010 letter from DRMS requires that you provide
information to DRMS to demonstrate you can replace long term injurious stream depletions
that result from mining related exposure of ground water. According to the renewal request,
the long term plan for the site is for a storage reservoir in Phase 2, which already has an
approved slurry wall, and to backfill Phases 1 and 7 to a ground surface elevation at least two
feet higher than the ground water table. Accordingly, a bond has been obtained for
$2,288,004 through DRMS, an amount sufficient to backfill Phases 1 and 7.
DEPLETIONS
Annual site depletions during the first plan year (August 1, 2018 through July 31, 2019) consist
of 296.07 acre-feet of gross evaporative losses, 11.0 acre-feet of pumping for dust control,
7.38 acre-feet of water removed in the mining product, and 675 acre-feet of water filling the
Phase 1 pit resulting from the planned cessation of dewatering, for a total depletion of 989.45
acre-feet. For the purpose of this SWSP, the 675 acre-feet of water filling the Phase 1 pit was
projected to occur over 3 months as shown in the table, below.
Month
Fill Percent
Fill Amount (a f)
(Unlagged Depletion)
1
8o%
540
2
15%
101.25
3
5%
33.75
Total
100%
675.0