HomeMy WebLinkAbout20130849.tiffENERGY COMPANY
n.. . J 6ol0EN CoinRADO
March 27, 2013
City Clerk's Office
Keenesburg Town Hall
140 South Main
Keenesburg, Colorado 80643
Weld County Clerk & Recorder
P.O. Box 459
Greeley, Colorado 80632
RECEIVED
MAR 292913
WELD COUNTY
COMMISSIONERS
Re: Technical Revision No. 44
Revision for Subsurface Water Monitoring Analysis schedule from quarterly to
Semi-annually revised page 56
Keenesburg Mine
Keenesburg, Colorado
Ladies and Gentlemen:
In accordance with the rules and regulations governing coal mining and reclamation operations in the
State of Colorado, public notice and a public review period is to be provided when a Technical Revision
to an existing Permit is proposed. Coors Energy Company has submitted its Technical Revision No. 44,
requesting approval for a change to the Subsurface Water Monitoring Analysis schedule from
quarterly to semi-annually at the Keenesburg Mine near Keenesburg, Colorado.
Please place this revised page 56 with the Technical Revision No. 44 materials previously submitted.
Thank you for your assistance.
Sincerely,
Danny Kipp
Chief Reclamation Specialist
Enclosures: Page 56
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2013-0849
Subsurface Water Monitoring and Analysis
Since the initiation of a formal ground -water sampling program in January, 1982,
subsurface water quality information has been collected from monitor wells at the
Keenesburg Mine. The present ground -water monitoring program provides
information which can be compared to the earlier baseline conditions relative to
groundwater movement and quality in the formerly active operations areas (now
used for ash disposal as part of the reclamation effort).
The results obtained from data collected in the field and from comprehensive water
quality analysis indicate that surface and ground -water quality has not been
significantly impacted by the mining operation, nor altered from the natural pre -
mining condition. In addition, regional ground -water movement patterns have not
been significantly influenced, altered or interrupted by the mining or reclamation
activities.
The subsurface water wells are monitored semi-annually April and September.
Quarterly sampling will resume at least one year prior to final bond release. The six (6)
wells presently monitored are:
1) FPW
2) DH -122
3) DH -96
4) AMW-1
5) SMW-2
6) AMW-2
Note: This is also the order in which the wells are sampled, based on
historic and present salinity levels. "Analysis" includes both field and laboratory
work performed on samples taken from all wells.
The sampling procedure to be used is described herein:
The order of sampling of the wells is determined based on the historical
salinity level of each of the wells relative to the others. The well with the
lowest salinity level is sampled first, followed by the others, in increasing
value. This order will protect each well against possible data
contamination from a higher salinity well. Following a visual examination
of the physical condition of the surface area around the well casing, and the
casing itself for damage or unusual conditions, the cap is removed and the
static water level is measured, from the top of the well casing, and
recorded. A one (1) liter sample bailer is used to remove five (5) bailer
volumes of water. The fifth bailer volume is used to rinse the field sample
containers. A sixth bailer volume is used to fill the field sample container.
The field sample is then analyzed and values are recorded for temperature,
pH, and electrical conductivity.
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