2013-01-29_HYDROLOGY - M2000082

• Permit No: M2000082
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/29/2013
• Doc Name: SWSP
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: PSH
• Media Type: D
• Archive: No

Jared Dains
East 8th SWSP
January 28, 2013
Page 2
the SWSP approval period.
The IDS Alluvial Water Accounting System (AWAS) analytical stream depletion model, which
uses the Glover method was used to calculate the lagged depletions to the Cache la Poudre River.
The following parameters were used in the model: transmissivity (T) = 120,000 gallons per day per
foot, specific yield (SY) = 0.2, the distance from the river to the edge of the alluvium = 11,000 feet,
and the distance from the centroid of the exposed surface water areas to the river = 600 feet. The
lagged depletions from evaporation and operations accruing to the stream system during this plan
period were determined to be 9.76 acre -feet.
See Table 1 for the monthly schedule of evaporative, operational, and lagged depletions.
Replacements
The City of Greeley ( "Greeley ") is the property owner and has agreed to provide the required
augmentation water for Superiors mining operations. Greeley will make available to Superior 12.6
acre -feet of wholly consumable water that has been changed for augmentation use from its
wastewater treatement plant (WDID 0302312) located a 1 /2 mile upstream of East 8 pit. For the lease
schedule a transit loss of 0.25% per mile has been incorporated. Any releases by Greeley at a
location other than its WWTP must be coordinated with the water commissioner to insure the proper
transit losses are applied and that no intervening water rights are injured. A November 6, 2012 letter
from Greeley confirming the monthly replacement schedule was provided to our office and is attached
to this letter.
Long Term Augmentation
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. In accordance with approach number 1, Aggregate
Industries holds a bond amount of $226,000 which Aggregate Industries contends is sufficient
bonding for backfilling the 5.8 acre excavation. As part of the succession of operators DRMS will
review the sufficiency of the bond and require modification as necessary. Should Superior fail to
produce the required bond this SWSP approval will be cancelled. It is noted that per the mining lease
agreement with the City of Greeley (landowner), the City has the long term augmentation
responsibility at this site.
Conditions of Approval
I hereby approve this substitute water supply plan, in accordance with Section 37 -90- 137(11),
C.R.S., subject to the following conditions:
1. This SWSP shall be valid for the period of November 1, 2012 through October 31, 2013,
unless otherwise revoked, modified, or superseded by decree. If this plan will not be made
absolute by a water court action by the plan's expiration date, a renewal request must be
submitted to this office with the statutory fee (currently $257) prior to the expiration date but no
later than August 15, 2013.
2. Well permit no. 63551 -F was obtained for the current use and exposed pond surface area of
the gravel pit in accordance with §37 -90- 137(2) and (11).
3. The consumptive use associated with this mining operation must not exceed a total of 8.86