FLOOD04769

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: Design and Construction of Levees
• Date: 3/31/1978
• Prepared For: Army
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

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EM 1110-2-1913
31 Mar 78

Table 2-3,

Phase I Boring and Sampling Techniques

Techniaue

1, Disturbed sample borings

a.

Split-spoon or standard
penetration test

b, Auger borings

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2. Test pits

3. Trenches

Remarks

l-a, Primarily for soil identification
but permits estimate of shear
strength of clays and crude estimate
of density of sands; see para-
graph 5-3d of EM 1110-2-1907
(ref. A-3a(8))

Preferred for general exploration of
levee foundations; indicates need and
locations for undisturbed samples

l-b, Bag and jar samples can be ob-
tained for testing

2, Use backhoes, dozers, and farm
tractors

3. Occasionally useful in borrow areas
and levee foundations

3-in.-diameter samples are taken in cohesionless materials. EM 1110-2-
1907 (ref. A3-a(8)) gives details of drilling ~~d sampling techniques.

2-9. Borings,

a. Location and Spacing, Tne spacing of borings and test pits in
Phase 1 is based on examination of airphotos and geological conditions
determined in the prelimina-~ stage or kno~~ from prior experience in
the area, and by the nature of the project, Initial spacing of borings
usually varies from 200 to 1000 ft along the alignment, being closer
spaced in expected problem areas and wider spaced in nonproblem areas.
The spacing of borings should not be arbitrarily uniform but rather
should be based on available geologic information, Borings are normally
laid out along the levee centerline but can be staggered along the
alignment in order to cover more area and to provide some data on nearby
borrow materials. At least one boring should be located at every major
structure during Phase 1. In Phase 2, the locations of additional

2-5

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