Environmental Engineering Reference
In-Depth Information
Reconnaissance Checklist
1.
Examine exposures of soils and rocks in cuts (highways, rail-roads, building
excavations, gravel pits, quarries, stream banks, and terraces), and on the sur-
face, and note effluent groundwater seepage.
2.
Examine slopes for signs of instability (creep ridges, tilted and bent trees, tilted
poles, and slope seepage).
3.
Examine existing structures and pavements for signs of distress.
4.
Note evidence of flood levels along streams.
5.
Contact local architects and engineers for information on foundations and local
soil conditions.
6.
Contact local well drillers for information on groundwater conditions.
7.
Contact local public officials for building code data and information on founda-
tions, soil conditions, and on-site utilities.
8.
Note site conditions imposing constraints on access for exploration equipment.
9.
Note present land use.
Revise Engineering Geology Map
The information gathered during site reconnaissance is used to revise the preliminary
engineering geology map where necessary.
2.2.6
Preparation of Subsurface Exploration Program
Prepare the subsurface exploration program, considering the necessity of:
Confirming the boundaries of the various geologic formations as mapped.
Obtaining data for the preparation of geologic sections.
Obtaining samples for identification, classification, and laboratory testing.
Obtaining in situ measurements of the engineering properties of the materials.
2.3
Subsurface Exploration
2.3.1
General
Objectives
To confirm or supplement the engineering geology map showing shallow and
surficial distributions of the various formations.
To determine the subsurface distribution of the geologic materials and ground-
water conditions.
To obtain samples of the geologic materials for identification and laboratory test-
ing ( Section 2.4) .
To obtain in situ measurements of engineering properties (Chapter 3).
Exploration Method Categories
General Categories
Direct methods allow the examination of materials, usually with the recovery of
samples; examples are excavations and test borings.
 
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