C153379 Feasibility Study

• Contract/PO #: C153379
• Contractor Name: Brook Forest Water District
• Contract Type: Loan
• Water District: 9
• County: Jefferson
• Bill Number: SB 80-67
• Loan Projects - Doc Type: Feasibility Study

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TABLE III-3
SUMMARY OF TEST PIT PROGRAM
Total
Geologic Formation Approximate Ground1 Depth
Test Pit No. Being Explored Elevation (Feet) (Feet)
TP- 1 Hurley Terrace 4477 7
TP- 2 Hurley Terrace 4485 7
TP- 3 Hurley Terrace 4485 6.5
TP- 4 Hurley Terrace 4493 10
TP- 5 Hurley Terrace 4497 6
TP- 6 Hurley Terrace 4495 4
TP- 7 Fox Hills Formation 4555 9
TP- 8 Sand Hills Formation 4555 9
TP- 9 Sand Hills Formation 4563 11.5
TP-I0 Hurley Terrace 4495 5
TP-ll Louviers Alluvium 4503 12
TP-12 Louviers Alluvium 4510 10
TP-13 Hurley Terrace 4503 5
TP-14 Hurley Terrace 4509 7.5

lElevations interpolated from the USGS 7.5 minute, Dearfield,
Colorado, Quadrangle map.

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Permeability tests were performed on relatively undisturbed samples
of the Sand Hills Formation and also on recompacted samples of Hurley Terrace,
Louviers Alluvium, Sand Hills Formation, Fox Hills Formation and Pierre
Shale. Each of these materials was recompacted to two different dry densities
and the permeability tests performed at these two different dry densities.

Pinhole dispersion tests were performed on compacted samples of the

remolded Pierre Shale and Fox Hills Formation. The results of the tests

were used to identify the potential for dispersion of colloidal particles

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