2012-02-03_HYDROLOGY - M1996052

• Permit No: M1996052
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/3/2012
• Doc Name: SWSP
• From: OSE
• To: Parsons Water Consulting, LLC
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Site Name
DRMS #
Bond Amount
Notes
Lohmann Pit
M- 2001 -017
$665,800
Rinn Valley Pit
M-1997-093
$114,700
Bond to be reassessed with forthcoming
amendment.
Firestone Pit
M- 1996 -052
$509,900
Fort Lupton Pit
M- 1999 -120
$997,872
Lupton Meadows Pit
M- 2002 -104
$289,000
Bond to be reassessed with forthcoming
amendment to M- 1999 -120
Mr. Rick Parsons, P.E.
L.G. Everist Combined SWSP
Page 2 of 9
During the past SWSP approval period (2010 — 2011) the liner for the Rinn Valley Phase 3 Reservoir
(WDID 0504005) was approved by the State Engineer's Office in December 2010. Additionally, the
Firestone Pit changed its status with DRMS from "Temporary Cessation" to "Active." Despite the change in
status, the Firestone pit will not be mined during this SWSP approval period.
L. G. Everist anticipates to actively mine three sites in 2012 and 2013: Lohmann Pit, Rinn Valley Pit,
and Lupton Meadows Pit. Depletions resulting from evaporation and mining operations at these sites are
replaced under this plan. Water use at these sites during the period of this plan will include dewatering,
evaporation from exposed groundwater, aggregate production, dust control and concrete batching.
L. G. Everist does not anticipate actively mining the Firestone or Ft. Lupton Pit during the period of
the SWSP. Both of these sites expose groundwater and only depletions resulting from evaporation will be
replaced under this SWSP.
Mining depletions from Lohmann Pit, Rinn Valley Pit and Firestone Pit are estimated to affect the
Saint Vrain Creek below the Last Chance Ditch headgate. Mining depletions from the Fort Lupton Pit and
the Lupton Meadows Pit are estimated to affect the South Platte River above the Meadow Island Ditch No. 1
headgate. The proposed replacement sources for these pits are Rural Ditch Company shares and Lupton
Bottom Ditch shares during the summer months. During the winter months and for portions of the summer
months the depletions will be replaced by releases from stored water in the Rinn Valley Phase 3 Reservoir
(WDID 0504005) and, if needed, nontributary Laramie -Fox Hills water withdrawn from well nos. 66271 -F,
66273 -F and 66274 -F.
In accordance with the letter dated April 30, 2010 (copy attached) 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. The operator intends to comply with this requirement by providing bonds sufficient to line
or backfill the pits in accordance with approaches nos. 1 and 3. One share each of the Rural and Lupton
Bottom Ditch has been dedicated to this plan as sufficient bonding is not yet in place. Future SWSPs for this
site will not authorize any additional use of ground water until the Applicant provides documentation that a
bond sufficient to cover lining or backfilling of each pit has been obtained. The current bond amount for
each pit is shown in Table C below.
TABLE C — DRMS Bonding
February 3, 2012