Problems in Geology of Eldorado Springs

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Table of Contents

Problem definition
Review of the existing literature
Methodology
Collection/ Analysis of data
Conclusion
Recommendations
References

This report discusses and interprets mountain front, foothills and the plains geology of Eldorado springs (Gerdner, 9). It gives a description of the soil formation in the area. The map and tables give detailed data of the area.

Problem definition

What is the guide to engineering soil in a site?

Review of the existing literature

The Eldorado springs mapping of landslide deposit, and specific surficial deposits, field evaluation of engineering characteristics of each unit of map, auger drilling, sampling and laboratory testing were done in connection to the present study to give the technical information (Scott 1965).

Methodology

Relative strength and soil constituency were measured by the resistance to soil penetration. Data on soil resistance and penetration were then compiled in terms of standard penetration resistance (Lambe 1960).

A hollow cylindrical tool, 2 inches in outside diameter, was driven into the subsoil by 140-pound hammer. The fall of the hammer is 30 inches. The standard penetration resistance was measured by the number of blows of the hammer required to drive the sampling tool 1 foot into the subsoil.

Collection/ Analysis of data

Table showing the relation of bearing strength to standard penetration resistance together with relative density and constituency;

Standard Penetration resistance of sand and gravel	Less than 4	4-10	10-30	30-50	Over 50
Relative density of sand and gravel	Very loose	Loose	Medium	Dense	Very Dense
Standard Penetration resistance of clay and silt	Less than 2	2-4	4-8	8-15	15-30	30-100	Over 100
Relative density of clay and silt	Very soft	Soft	Medium	Stiff	Very Stiff	Hard	Very hard

The results of PVC test of geology of engineering map units

PVC Rating	Category	Swell Index(Pounds per square foot)
Less than 2	Non-critical	Less than 1700
2-4	Marginal	1700-3200
4-6	Critical	3200-4700
Greater than 6	Very Critical	Over 4700

The above table shows the PVC rating category and the swell index as established by Lambe (Lambe 1960)

The dominantly clay shale formation ( Greenhorn limestone, Carlike shale, smoky Hill member of the Niobrara formation, and Pierre shale excluding the Hygiene Sandstone are Member are subdivided and regrouped into 4 engineering and map units (Scott 1965). The four rocks are classified according to litho logy and potential of the rocks to swell when wetted.

Conclusion

The report is detailed as it gives the complete information regarding soil constituency and its relative mass. This is a good guide to engineering soil in this area of Eldorado springs (Lahee 1961).

Recommendations

The condition are unsatisfactory where the impervious rock and the water table is within 7 feet of the surface where the conditions of the rock structure are, such that affluent may emerge as seeps on the surface (Watts 1967).

References

Brodie, K 2007, Structural terms including fault rock terms: Recommendations by the IUGS Sub commission on the Systematic of Metamorphic Rocks. Web.

Compton, RR 1985, Geology in the Field. Web.

Lahee, FH 1961, Field Geology, 6th ed. Web.

Lambe, TW 1960, The characteristics and identification of expansive soils, Federal Housing Technical Studies Department, New York.

Scott, CR1965, Geological and Biostratigraphic map of the Pierre, U.S Geology Survey, NewYork.

Watts, JD 1967, Geology of the Eldorado Springs quadrangle, Colorado, U. S Geology Survey, New York.

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