2021-09-07_REVISION - M1973021 ‎(4)‎

• Permit No: M1973021
• IBM Index Class Name: Revision
• Doc Date: 9/7/2021
• Doc Name Note: Permit Entire Document
• Doc Name: Adequacy Review Response
• From: Aggregate Industries-WCR, Inc.
• To: DRMS
• Type & Sequence: AM7
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Aggregate Industries, Morrison Quarry
Amendment No.7 to Permit M-1973-021 FYZ
Morrison,CO
Exhibit G - Water Information
Project Water Requirements
The mine obtains water for its operations directly from Reservoir Site II using onsite pumps. The
Town of Morrison owns Reservoir Site II, and monitors and accounts for consumption daily.
Table G-1 summarizes water usage during the 2019 calendar year. Estimates from operators
are that 80% of the water is used for dust control, and the remaining 20% is mostly used for
aggregate washing and wheel washing.
Table G-1. Summary of 2019 Water Use at Morrison Quarry
Month Amount diverted from
Reservoir Site II (acre-feet)
January 1.62
February 1.79
March 2.59
April 3.98
May 3.32
June 5.05
July 6.67
August 7.14
September 7.40
October 6.20
November 2.76
December 1.48
Total Diverted 50.00
Although not currently used, Aggregate Industries, Inc. has water rights from two wells that are
permitted from the State Engineers Office. The wells, identified as Morrison Municipal Intake
and Morrison Municipal Intake No. 2, provide Aggregate Industries, Inc. with maximum
respective volumes of 2.5 and 5.0 cubic feet per second (cfs), for a total of 7.5 cfs. Aggregate
Industries, Inc. is currently investigating the need for and future use of these wells.
Exhibit CA and Exhibit C.2 show water courses, wells, reservoirs, ditches, and other water
sources within the permit boundary and on adjacent lands near the mine site that are or maybe
effected by the mining operations.
Site Hydrology Overview
Mining operations have already affected surface water and stormwater drainage areas at the
site. The section titled Surface Water, below, discusses existing and planned structures used to
divert most upgradient surface water and stormwater away from the site. The section titled
Stormwater, below, discusses stormwater management within the affected area.
To date, groundwater has been minimally impacted by mining activities. Groundwater was
minimally encountered during North Quarry and Central Quarry mining activities. These
activities have been completed, and groundwater is no longer impacted in this area. Planned
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