PROJ00487

• Contract/PO #: FS0007X
• Contractor Name: Kennesburg, Town of
• County: Weld
• Loan Projects - Doc Type: Feasibility Study

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INTRODUCTION
The ever increasing need for additional
water in the Denver basin area to supply con-
tinuing growth of sub urban communities,
emphasizes the need for better definition of
available water resources. The accompany-
ing maps showing the configuration and alti-
tude, and the depth to the top of one of the
most widespread and widely used aquifers in
the Denver basin - the Laramie.Fox Hills
aquifer - are a step in providmg better difini-
tion. The maps were prepared by the Colo-
rado Division of Water Resources in coopera-
tion with the U.S. Geological Survey.
THE LARAMIE.FOX HILLS AQUIFER

One of the principal aquifers in the Denver
basin area - here designated the Laramie-Fox
Hills aquifer - includes the thick-bedded sand-
stones of the lower part of the Laramie Forma-
tion and the underlying Fox. Hills Sandstone -
both of Cretaceous age. Electric logs of about
275 water and oil-test wells were examined to
determine the top of the aquifer. The location
ofthese wells are shown on the map showing
the approximate altitude and configuration
of the top of the Laramie-Fox Hills aquifer..
The Laramie-Fox Hills aquifer consists of a
medium-grained sandstone, 20 to 50 feet
thick, overlying and grading downward into
finer-grained thin-bedded sandstone inter-
bedded with siltstone and shale, 20 to SO feet
thick. This sequence overlies fine-grained
quartzose sandstone, siltstone, and shale, 60
to 120 feet thick. Younger rocks including
thin bedded sandstone, shale, and coal of the
Laramie, and sandstone and shale of the Daw-
son Formation overlie the Laramie-Fox Hills
aquifer in the mapped area and are as thick as
2,800 feet southeast of Castle Rock as indi-
cated by the map showing depth to the top
of the Laramie-Fox Hills aquifer.
Wells that fully penetrate the Laramie-Fox
Hills aquifer generally yield about 100 gallons
per minute, and a few yield as much as 900
gallons per minute. Water in the aquifer, at
places, contains objectionable amounts of
methane, hydrogen sulfide, iron, and fluoride.
In most places the aquifer contains water of
suitable quality for domestic use.

SELECTED REFERENCES

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