2023-01-10_PERMIT FILE - M2023001 ‎(12)‎

• Permit No: M2023001
• IBM Index Class Name: Permit File
• Doc Date: 1/10/2023
• Doc Name Note: Exhibit G - Water Information
• Doc Name: Application
• From: J-2 Contracting Company
• To: DRMS
• Email Name: PSH
• Email Name: JLE
• Media Type: D
• Archive: No

Fair Meadows Pit Groundwater Evaluation
November 19, 2022 Page 4 of 28
APPENDIX A— GROUNDWATER EVALATION AND MODELING
The proposed Fair Meadows gravel pit mine is located approximately 3 miles east of Greeley,
Colorado in Sections 3, Township 5 North, Range 65 West (6th PM). The site is located
approximately 1000 feet north of the South Platte River (SPR). Figure Al is a Google Earth
image that shows: the pit property, permitted wells color coded by use, pit monitoring wells MW-
1 through MW-5 and the model/study area boundary.
Available Data
We compiled hydrogeologic data from:
• Existing reports from the US Geological Survey and Colorado Division of Water
Resources (see Sources below);
• Well completion reports from the State's Well database(SEO wells) within approximately
1.5 miles of the proposed pit;
• This includes 15 registered wells that are currently being monitored by J&T to evaluate
water level changes in response to other recently constructed Loloff and Derr pits located
west of the Fair Meadows pit; and
• 5 Fair Meadows Monitoring wells provided by J&T.
Table Al includes well data from 122 registered wells extracted from the State's well database
(CDWR, 2022). Most of the existing wells are used for domestic water supply and irrigation.
Data includes: the well owner, permit number, well type, Colorado State Plane coordinates,
registered"use"type,well depth,well yield in gallons per minute(gpm), water level when drilled
and depth to bedrock. The reported well depth and depth to bedrock are slightly different but the
depth to bedrock is a more accurate indicator of the bottom of the alluvial aquifer. Well statics for
all the wells is shown at the bottom of the table. The depth to bedrock ranges from 15 to 134 ft
and averages 65 feet. Well yields range from 7 gpm for domestic wells to 1200 gpm for irrigation
wells. The depth to water when drilled ranges from 2 to 50 feet and averages 24 feet.
Table A2 shows monitoring well data for the five Fair Meadows borehole monitoring wells.
The wells were drilled by Cesare, Inc./CMT Technical Services to characterize the site. Details
on drilling, materials encountered, well construction and water level information can be found in
the report included in Appendix B. The average site depth to bedrock is 85 ft and depth to
water is 29 ft which are greater than the model area average.
Monitoring Registered Wells Up-Gradient
There are two other gravel pits that have been developed in the past 5 years located upgradient
from the site. The Loloff Pit was lined in 2017 and the Derr Pit was lined in 2020. Broken
Arrow Investments (BAI) is responsible for monitoring 15 neighborhood wells for these projects,
and J&T provided us the data to help characterize the aquifer. Monthly water level depth
measurements since September, 2019 are shown in Table A3. In summary,the data shows that
water levels fluctuate 2-4 feet due to a combination of. i) general recovery from Loloff and Derr
dewatering prior after installing their slurry walls; ii) water level changes caused by the slurry
McGrane Water Engineering,LLC
1669 Apple Valley Rd. •Lyons,CO 80540 •Phone:[phone]
E-Mail:[e-mail] Web:ttp://www.mcgranewaterengineering.com