PROJ00166

• Contract/PO #: C153311
• Contractor Name: Nunn, Town of
• Contract Type: Loan
• Water District: 0
• County: Weld
• Bill Number: SB 78-69
• Loan Projects - Doc Type: Feasibility Study

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of test holes and recorded the logs. The locations of the test holes
are shown on Figure IV-2, Copies of the logs for the three lines of test
holes shown on Figure IV-2 are included in the Appendix to this report.
In order to check the hypothesis on the existence of two separate shallow
aquifers, a plot (Figure IV-I) of the test hole data for each line of test
holes was made and overlaid on the U.S.G.S. topographic map of the area,
The plots SlOW the surface profile and the bedrock profile, and the area
between the profile represents the residual and alluvial deposits containing
the surface shallow alluvial groundwater. From these plots, two shallow
aquifers are evident with a bedrock barrier separating the two aquifers.
The location of the bedrock barrier (the bedrock elevation is at or near
the ground surface elevation) corresponds to the existing ridge which separates
the Spring Creek and Lone Tree Creek drainage (refer to Figule IV-l which
illustrates the approximate location of the barrier separating the two
aquifers). This conclusion on the existence of two shallow aquifers is
supported by Figure 5 in a report by the U.S.G.S. on the groundwater
investigations conducted by the U.S.G.S. in the early 1960's (Reference 8).
The conclusion that follows is based on the above described data and
analysis, The first alternative (namely, a separate low nitrate water sourcE')
de~;cribed previously for improving the nitrate problem is feasible. It
appears that by constructing one or more shallow wells and tapping the
aquifer in the Lone Tree Creek drainage, a good quality water low in nitrate;
can be obtained. This solution to the problem would involve new wells and
a new raw water supply pipeline from the wells to the Town's distribution
system.

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